| <!doctype html><html lang=en-US dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-1.6.0 docs-doc-page docs-doc-id-json/custom-codecs" data-has-hydrated=false><head><meta charset=UTF-8><meta name=generator content="Docusaurus v3.10.1"><title data-rh=true>Custom Codecs | Apache Fory™</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"/><meta data-rh=true property=og:url content=https://fory.apache.org/docs/json/custom-codecs /><meta data-rh=true property=og:locale content=en_US /><meta data-rh=true property=og:locale:alternate content=zh_CN /><meta data-rh=true name=docusaurus_locale content=en-US /><meta data-rh=true name=docsearch:language content=en-US /><meta data-rh=true http-equiv=Content-Security-Policy content="frame-src 'self' https://ghbtns.com/;"/><meta data-rh=true property=og:image content=https://fory.apache.org/img/logo.png /><meta data-rh=true property=og:image:width content=1500 /><meta data-rh=true property=og:image:height content=1500 /><meta data-rh=true name=twitter:card content=summary_large_image /><meta data-rh=true name=twitter:image content=https://fory.apache.org/img/logo.png /><meta data-rh=true name=docusaurus_version content=1.6.0 /><meta data-rh=true name=docusaurus_tag content=docs-default-1.6.0 /><meta data-rh=true name=docsearch:version content=1.6.0 /><meta data-rh=true name=docsearch:docusaurus_tag content=docs-default-1.6.0 /><meta data-rh=true property=og:title content="Custom Codecs | Apache Fory™"/><meta data-rh=true name=description content="JsonValueCodec is Fory JSON's streaming codec SPI for one complete JSON value. 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theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="categoryLink_byQd menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/development/><span title=Development class=categoryLinkLabel_W154>Development</span></a></div></ul></nav></div></div></aside><main class=docMainContainer_TBSr><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_VOVn"><div class=docItemContainer_Djhp><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label=Breadcrumbs><ul class=breadcrumbs><li class=breadcrumbs__item><a aria-label="Home page" class=breadcrumbs__link href=/><svg viewBox="0 0 24 24" class=breadcrumbHomeIcon_YNFT><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Fory JSON</span><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Custom Codecs</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.6</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Custom Codecs</h1></header><p><code>JsonValueCodec<T></code> is Fory JSON's streaming codec SPI for one complete JSON value. It writes |
| directly to Fory's String or UTF-8 writer and reads directly from Fory's Latin-1, UTF-16, or UTF-8 |
| reader. It is not a JSON abstract syntax tree (AST) or <code>JsonNode</code> codec. It owns the complete value, |
| including JSON null, but never handles a Map key; <code>MapKeyCodec</code> remains responsible for JSON object |
| member names.</p> |
| <p>For an application codec with the same semantics in every representation, extend |
| <code>AbstractJsonValueCodec<T></code> and implement the JSON shape once:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>math</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">BigDecimal</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>codec</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">AbstractJsonValueCodec</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>reader</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">JsonReader</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>writer</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">JsonWriter</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>extends</span><span class="token plain"> </span><span class="token class-name">AbstractJsonValueCodec</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@Override</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>void</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>write</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">JsonWriter</span><span class="token plain"> writer</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> value</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>if</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>null</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> writer</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>writeNull</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>else</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> writer</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>writeBigDecimal</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">amount</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@Override</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>read</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">JsonReader</span><span class="token plain"> reader</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>return</span><span class="token plain"> reader</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>tryReadNullToken</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>?</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>null</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reader</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>readBigDecimal</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token class-name">BigDecimal</span><span class="token plain"> amount</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token class-name">Money</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">BigDecimal</span><span class="token plain"> amount</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>this</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">amount </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> amount</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p><code>AbstractJsonValueCodec</code> adds one virtual method call per operation. For a |
| performance-sensitive codec, or when behavior depends on a concrete reader or writer, implement |
| <code>JsonValueCodec<T></code> directly and provide all five representation-specific methods.</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">ForyJson</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token class-name">ForyJson</span><span class="token plain"> json </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token class-name">ForyJson</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>registerCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Money</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <p>The containing property still controls its name, ignore direction, and null-inclusion policy. If a |
| null property is omitted, the value codec is not called. If the property is emitted, or the value |
| is an array element, collection element, map value, Optional value, or atomic-reference value, the |
| codec receives and owns null. The registered instance is shared across concurrent operations and |
| must be thread-safe.</p> |
| <p>A custom codec that materializes composite graph owners must call <code>JsonReader.reserveGraphMemory</code> |
| with its application-defined byte estimate before creating each owner. This applies to composite |
| application objects, collections, maps, and reference arrays. Reserve collection and map reference |
| storage before the mutation that may grow it. A custom scalar or other dedicated leaf |
| representation, such as <code>MoneyCodec</code> above, does not reserve graph memory. Complete codecs also |
| perform their own application validation; Fory JSON does not wrap a complete custom representation |
| with the target type's <code>JsonValidator</code> methods.</p> |
| <p>Registering a custom codec for a <code>JsonSubTypes</code> base replaces that base's subtype annotation. |
| Registering one for a listed subtype is supported by the two wrapper inclusions but not by inline |
| property inclusion.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=selecting-codecs-with-jsoncodec>Selecting Codecs with <code>JsonCodec</code><a href=#selecting-codecs-with-jsoncodec class=hash-link aria-label="Direct link to selecting-codecs-with-jsoncodec" title="Direct link to selecting-codecs-with-jsoncodec" translate=no></a></h2> |
| <p>Use <code>@JsonCodec</code> on a class, record, enum, or interface to declare its default complete-value |
| codec. The positional form is shorthand for <code>value</code>:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>annotation</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">JsonCodec</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">AccountCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>interface</span><span class="token plain"> </span><span class="token class-name">Account</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">RetailAccount</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>implements</span><span class="token plain"> </span><span class="token class-name">Account</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Type declarations are inherited through both superclasses and interfaces. The most-specific |
| declaration wins. Unrelated declarations using the same codec are consistent; unrelated |
| declarations using different codecs fail instead of depending on reflection order.</p> |
| <p>On a field or effective ordinary getter, <code>value</code> replaces the complete property value. The same |
| annotation is supported on an effective setter value parameter, a <code>JsonCreator</code> constructor or |
| factory parameter, and a record component through Java's field, accessor, and constructor-parameter |
| propagation:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">Invoice</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> total</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>private</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> tax</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>private</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> discount</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>getTax</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>return</span><span class="token plain"> tax</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>void</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>setDiscount</span><span class="token punctuation" style=color:#393A34>(</span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> discount</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>this</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">discount </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> discount</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCreator</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Invoice</span><span class="token punctuation" style=color:#393A34>(</span><span class="token annotation punctuation" style=color:#393A34>@JsonProperty</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"total"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token plain"> total</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>this</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">total </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> total</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Use a child member when the standard container should remain in control and only its direct child |
| needs a custom codec:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">List</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">Map</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">Optional</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>concurrent</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>atomic</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">AtomicReference</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>concurrent</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>atomic</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">AtomicReferenceArray</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">InvoiceGroup</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">elementCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">List</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> items</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">elementCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token punctuation" style=color:#393A34>[</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> itemArray</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">elementCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">AtomicReferenceArray</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> atomicItems</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">contentCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Optional</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> optional</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">contentCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">AtomicReference</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> current</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">keyCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">CurrencyKeyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> valueCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Map</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Currency</span><span class="token generics punctuation" style=color:#393A34>,</span><span class="token generics"> </span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> byCurrency</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>The child members have these meanings:</p> |
| <table><thead><tr><th>Member<th>Supported current value<th>Direct child handled by the codec<tbody><tr><td><code>elementCodec</code><td><code>Collection<E></code>, <code>E[]</code>, <code>AtomicReferenceArray<E></code><td><code>E</code><tr><td><code>contentCodec</code><td><code>Optional<T></code>, <code>AtomicReference<T></code><td><code>T</code><tr><td><code>keyCodec</code><td><code>Map<K, V></code><td>JSON member name for <code>K</code><tr><td><code>valueCodec</code><td><code>Map<K, V></code><td>direct <code>V</code> value</table> |
| <p>A custom Map-key codec converts between the declared key and a JSON member name:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>java</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>util</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">Locale</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token import namespace" style=opacity:0.7>org</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>apache</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>fory</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>json</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import namespace" style=opacity:0.7>codec</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">MapKeyCodec</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">CurrencyKeyCodec</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>implements</span><span class="token plain"> </span><span class="token class-name">MapKeyCodec</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@Override</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">String</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>toName</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Object</span><span class="token plain"> key</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>return</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Currency</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> key</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>name</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>toLowerCase</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Locale</span><span class="token punctuation" style=color:#393A34>.</span><span class="token constant" style=color:#36acaa>ROOT</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token annotation punctuation" style=color:#393A34>@Override</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Object</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>fromName</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">String</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>return</span><span class="token plain"> </span><span class="token class-name">Currency</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>valueOf</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">name</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>toUpperCase</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Locale</span><span class="token punctuation" style=color:#393A34>.</span><span class="token constant" style=color:#36acaa>ROOT</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Code that used the removed type-use form should move the codec to the owning declaration:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// Before</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token class-name">List</span><span class="token operator" style=color:#393A34><</span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token class-name">Money</span><span class="token operator" style=color:#393A34>></span><span class="token plain"> items</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// Now</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">elementCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token class-name">List</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> items</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <p>Use <code>contentCodec</code> for an <code>Optional</code> or <code>AtomicReference</code>, <code>valueCodec</code> for a Map value, and |
| <code>elementCodec</code> for an array or <code>AtomicReferenceArray</code> element.</p> |
| <p><code>Iterable<E></code> values that are not <code>Collection<E></code> do not support <code>elementCodec</code>. Use <code>value</code> when a |
| complete codec should own such a value.</p> |
| <p>Child configuration is intentionally one level deep. For <code>List<List<Money>></code>, <code>elementCodec</code> |
| handles each complete <code>List<Money></code>. For <code>Money[][]</code>, it handles each <code>Money[]</code>. To customize a |
| deeper descendant, implement a codec for the complete current value and select it with <code>value</code>.</p> |
| <p><code>value</code> is mutually exclusive with every child member because it already owns the complete current |
| value. An empty annotation, an unsupported child member, or an outer complete codec combined with |
| a child member fails during model construction. A configured direct child must resolve to a |
| concrete type; raw containers, direct wildcards, and unresolved direct type variables are rejected.</p> |
| <p><code>JsonAnyProperty</code> and <code>JsonAnyGetter</code> flatten their Map into the enclosing object. Configure their |
| dynamic values with <code>valueCodec</code>:</p> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token annotation punctuation" style=color:#393A34>@JsonAnyProperty</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@JsonCodec</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">valueCodec </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">MoneyCodec</span><span class="token punctuation" style=color:#393A34>.</span><span class="token keyword" style=color:#00009f>class</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>public</span><span class="token plain"> </span><span class="token class-name">Map</span><span class="token generics punctuation" style=color:#393A34><</span><span class="token generics class-name">String</span><span class="token generics punctuation" style=color:#393A34>,</span><span class="token generics"> </span><span class="token generics class-name">Money</span><span class="token generics punctuation" style=color:#393A34>></span><span class="token plain"> extra</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <p>The first <code>JsonAnySetter</code> parameter is the String property name. Its second parameter may use |
| <code>@JsonCodec(value = ...)</code> or another configuration valid for that parameter's own shape.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=codec-precedence-and-repeated-declarations>Codec Precedence and Repeated Declarations<a href=#codec-precedence-and-repeated-declarations class=hash-link aria-label="Direct link to Codec Precedence and Repeated Declarations" title="Direct link to Codec Precedence and Repeated Declarations" translate=no></a></h2> |
| <p>Fory resolves each current value in this order:</p> |
| <table><thead><tr><th style=text-align:right>Priority<th>Source<tbody><tr><td style=text-align:right>1<td>Current property or parameter <code>JsonCodec</code><tr><td style=text-align:right>2<td>Exact <code>registerCodec</code> registration<tr><td style=text-align:right>3<td>Exact-target type <code>JsonCodec</code> after Mixin overlay<tr><td style=text-align:right>4<td>Inherited-frontier type <code>JsonCodec</code> declaration<tr><td style=text-align:right>5<td>Built-in or default JSON mapping</table> |
| <p>One logical property may expose the annotation from its field, getter, setter parameter, creator |
| parameter, or record propagation. Repeated configurations must be identical; Fory does not merge |
| partial configurations from different declarations. An unannotated effective override suppresses |
| an inherited method annotation.</p> |
| <p>A child member replaces only that direct child. Unconfigured Map siblings continue through the |
| normal precedence. If an exact registration or type declaration supplies a complete codec for the |
| outer container, a property child member is unreachable and therefore rejected.</p> |
| <p>Map keys are JSON object member names and use <code>MapKeyCodec</code>, not <code>JsonValueCodec</code>. A custom key |
| codec class follows the same construction rules as a value codec. Null Map keys are rejected, and |
| decoded keys must match the declared key type.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=codec-construction-and-platform-support>Codec Construction and Platform Support<a href=#codec-construction-and-platform-support class=hash-link aria-label="Direct link to Codec Construction and Platform Support" title="Direct link to Codec Construction and Platform Support" translate=no></a></h2> |
| <p>An annotation codec class must be public, concrete, top-level or static nested, and have a public |
| no-argument constructor. One instance is shared by all annotated sites and concurrent operations of |
| the built <code>ForyJson</code>, so it must be thread-safe. Use <code>registerCodec(Target.class, instance)</code> when a |
| complete-value codec needs configuration.</p> |
| <p>Outside GraalVM Native Image, a named Java module must export or open the codec package to |
| <code>org.apache.fory.json</code>. Native Image prepares annotation-codec constructors during image |
| construction and does not require that package access. When an inherited type-declaration codec is |
| used for a more specific target, every decoded value must be null or assignable to that target.</p> |
| <p>The annotation has the same FIELD, METHOD, and PARAMETER behavior on the JVM, Android, and GraalVM |
| Native Image. Ordinary Android classes may omit <code>JsonType</code> and provide equivalent exact rules. |
| Android-desugared Records, including <code>JsonValue</code> Records, require processor-generated operations |
| from either a direct <code>JsonType</code> declaration or a compiled exact <code>JsonMixin</code> pair. GraalVM object |
| models follow the build-time workflow in the |
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