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aria-label="Expand sidebar category 'Cross Language'" aria-expanded=false type=button class="clean-btn menu__caret"></button></div></ul></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="theme-doc-version-banner alert alert--warning margin-bottom--md" role=alert><div>This is documentation for <!-- -->Apache Fory™<!-- --> <b>0.17</b>, which is no longer actively maintained.</div><div class=margin-top--md>For up-to-date documentation, see the <b><a href=/docs/introduction/overview>latest version</a></b> (<!-- -->1.3.0<!-- -->).</div></div><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>Guide</span><li class=breadcrumbs__item><a class=breadcrumbs__link href=/docs/0.17/guide/java/><span>Java</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Enum Configuration</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 0.17</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>Enum Configuration</h1></header><p>This page explains how Java enum serialization is configured in Apache Fory.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=default-enum-behavior>Default Enum Behavior<a href=#default-enum-behavior class=hash-link aria-label="Direct link to Default Enum Behavior" title="Direct link to Default Enum Behavior" translate=no></a></h2> |
| <p>Java enums can be serialized in two modes:</p> |
| <ol> |
| <li class=""><strong>By numeric tag</strong>: the default behavior</li> |
| <li class=""><strong>By enum name</strong>: enabled with <code>serializeEnumByName(true)</code></li> |
| </ol> |
| <p>Numeric tags are always used in xlang mode. In native Java mode, <code>serializeEnumByName(true)</code> |
| switches enum serialization to names instead of numeric tags.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=serialize-enums-by-name>Serialize Enums by Name<a href=#serialize-enums-by-name class=hash-link aria-label="Direct link to Serialize Enums by Name" title="Direct link to Serialize Enums by Name" translate=no></a></h2> |
| <p>Use <code>serializeEnumByName(true)</code> when native Java peers should match enum constants by name instead |
| of numeric tag.</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 class-name">Fory</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</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>withLanguage</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Language</span><span class="token punctuation" style=color:#393A34>.</span><span class="token constant" style=color:#36acaa>JAVA</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>serializeEnumByName</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</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>This mode is useful when declaration order is unstable but enum names remain fixed. It only affects |
| native Java mode. Xlang still uses numeric tags.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=stable-numeric-enum-ids>Stable Numeric Enum IDs<a href=#stable-numeric-enum-ids class=hash-link aria-label="Direct link to Stable Numeric Enum IDs" title="Direct link to Stable Numeric Enum IDs" translate=no></a></h2> |
| <p>Without <code>serializeEnumByName(true)</code>, Java enums are serialized by numeric tag. The default tag is |
| the declaration ordinal. When an enum needs stable ids that do not depend on declaration order, |
| annotate exactly one id source with <code>@ForyEnumId</code>, or annotate every enum constant with explicit |
| tag values.</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>annotation</span><span class="token import namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token import class-name">ForyEnumId</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>enum</span><span class="token plain"> </span><span class="token class-name">Status</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 class-name">Unknown</span><span class="token punctuation" style=color:#393A34>(</span><span class="token number" style=color:#36acaa>10</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 class-name">Running</span><span class="token punctuation" style=color:#393A34>(</span><span class="token number" style=color:#36acaa>20</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 class-name">Finished</span><span class="token punctuation" style=color:#393A34>(</span><span class="token number" style=color:#36acaa>30</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>private</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>int</span><span class="token plain"> id</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">Status</span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>int</span><span class="token plain"> id</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">id </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> id</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>@ForyEnumId</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>int</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>getId</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"> id</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>Java also supports annotating one enum instance field with <code>@ForyEnumId</code>, or annotating every enum |
| constant directly such as <code>@ForyEnumId(10) Unknown</code>.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=foryenumid-styles><code>@ForyEnumId</code> Styles<a href=#foryenumid-styles class=hash-link aria-label="Direct link to foryenumid-styles" title="Direct link to foryenumid-styles" translate=no></a></h3> |
| <p><code>@ForyEnumId</code> supports exactly three configuration styles:</p> |
| <ol> |
| <li class="">Annotate one enum instance field and store the numeric id there.</li> |
| <li class="">Annotate one zero-argument public instance method such as <code>getId()</code>.</li> |
| <li class="">Annotate every enum constant directly with an explicit value such as <code>@ForyEnumId(10) Unknown</code>.</li> |
| </ol> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=validation-rules>Validation Rules<a href=#validation-rules class=hash-link aria-label="Direct link to Validation Rules" title="Direct link to Validation Rules" translate=no></a></h3> |
| <ol> |
| <li class="">Use exactly one of those three styles for a given enum.</li> |
| <li class="">Field and method annotations must leave <code>value()</code> at its default <code>-1</code>.</li> |
| <li class="">Enum-constant annotations must appear on every constant once any constant uses <code>@ForyEnumId</code>.</li> |
| <li class="">All ids must be non-negative, unique, and fit in Java <code>int</code>.</li> |
| </ol> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=lookup-behavior>Lookup Behavior<a href=#lookup-behavior class=hash-link aria-label="Direct link to Lookup Behavior" title="Direct link to Lookup Behavior" translate=no></a></h3> |
| <ol> |
| <li class="">Without <code>@ForyEnumId</code>, Fory writes the declaration ordinal.</li> |
| <li class="">With <code>@ForyEnumId</code>, Fory writes the configured stable numeric tag instead.</li> |
| <li class="">Small dense tags use an array lookup internally; sparse larger tags fall back to a map.</li> |
| </ol> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=choosing-between-name-and-numeric-modes>Choosing Between Name and Numeric Modes<a href=#choosing-between-name-and-numeric-modes class=hash-link aria-label="Direct link to Choosing Between Name and Numeric Modes" title="Direct link to Choosing Between Name and Numeric Modes" translate=no></a></h2> |
| <ul> |
| <li class="">Use <strong>enum names</strong> when the enum is Java-only and constant names are the intended compatibility key.</li> |
| <li class="">Use <strong>numeric tags</strong> when cross-language payloads or stable explicit ids matter.</li> |
| <li class="">Use <strong><code>@ForyEnumId</code></strong> when declaration order may change but the numeric wire ids must stay stable.</li> |
| </ul> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=related-topics>Related Topics<a href=#related-topics class=hash-link aria-label="Direct link to Related Topics" title="Direct link to Related Topics" translate=no></a></h2> |
| <ul> |
| <li class=""><a class="" href=/docs/0.17/guide/java/configuration>Configuration</a> - <code>serializeEnumByName</code> and other runtime options</li> |
| <li class=""><a class="" href=/docs/0.17/guide/java/field_configuration>Field Configuration</a> - <code>@ForyField</code>, <code>@Ignore</code>, and integer encoding annotations</li> |
| <li class=""><a class="" href=/docs/0.17/guide/java/cross_language>Cross-Language</a> - Xlang enum interoperability</li> |
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