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| <article class="doc"> |
| <a name="section-top"></a> |
| <h1 class="page">Mixins</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This section defines a number of role interfaces that definea contract for some framework-defined mixins.</p> |
| </div> |
| <div class="admonitionblock tip"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-tip" title="Tip"></i> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>See the <a href="../../../../userguide/2.0.0-M3/fun/overview.html#mixins" class="page">fundamentals user guide</a> for a discussion of mixins.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="Object"><a class="anchor" href="#Object"></a><code>Object</code></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The framework provides a single mixin that contributes to simply <code>java.lang.Object</code>. |
| It provides the ability to download the layout XML for any domain object (in practical terms: entities and view models).</p> |
| </div> |
| <div class="paragraph"> |
| <p>These mixin actions are all associated with the "Metadata" fieldset. |
| A number of other <a href="../about.html#Persistable" class="page">mixins</a> also contribute properties or actions to the "Metadata" fieldset.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="clearHints"><a class="anchor" href="#clearHints"></a><code>clearHints()</code></h3> |
| <div class="paragraph"> |
| <p>When a domain object is rendered the end-user can select different tabs, and for collections can sort the columns, |
| navigate to second pages, or select different views of collections. |
| If the user revisits that object, the <a href="../../../../vw/2.0.0-M3/about.html" class="page">Wicket viewer</a> will remember these hints and render the domain object in the same state. |
| These rendering hints are also included if the user copies the URL using the anchor link (to right hand of the object’s title).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>Object_clearHints</code> mixin provides the ability for the end-user to discard these hints so that the object is |
| rendered in its initial state:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public void clearHints() { |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="related-services"><a class="anchor" href="#related-services"></a>Related Services</h4> |
| <div class="paragraph"> |
| <p>This mixin uses the <a href="../../applib-svc/HintStore.html" class="page"><code>HintStore</code></a> service to store and retrieve UI hints for each rendered object, per user.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="downloadlayoutxml"><a class="anchor" href="#downloadlayoutxml"></a><code>downloadLayoutXml()</code></h3> |
| <div class="paragraph"> |
| <p>The <code>Object_downloadLayoutXml</code> mixin provides an action to download the <a href="../../../../userguide/2.0.0-M3/fun/ui.html#object-layout" class="page">layout XML</a> for the current domain object. |
| It has the following signature:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public Object downloadLayoutXml( |
| @ParameterLayout(named = "File name") |
| final String fileName, |
| final LayoutService.Style style) { <i class="conum" data-value="1"></i><b>(1)</b> |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>either current, complete, normalized or minimal.</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>See the documentation on <a href="../../../../userguide/2.0.0-M3/fun/ui.html#object-layout" class="page">layout XML</a> and also |
| the <a href="../../applib-svc/LayoutService.html" class="page"><code>LayoutService</code></a> for more information on these styles</p> |
| </div> |
| <div class="sect3"> |
| <h4 id="related-services-2"><a class="anchor" href="#related-services-2"></a>Related Services</h4> |
| <div class="paragraph"> |
| <p>This mixin calls <a href="../../applib-svc/LayoutService.html" class="page"><code>LayoutService</code></a> to obtain the layout XML.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="rebuildMetamodel"><a class="anchor" href="#rebuildMetamodel"></a><code>rebuildMetamodel()</code></h3> |
| <div class="paragraph"> |
| <p>The <code>Object_rebuildMetamodel</code> mixin provides the ability to discard the current internal metamodel data (an instance of <code>ObjectSpecification</code>) for the domain class of the rendered object, and recreate from code and other sources (most notably, layout XML data). |
| It has the following signature:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public void rebuildMetamodel() { |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="related-services-3"><a class="anchor" href="#related-services-3"></a>Related Services</h4> |
| <div class="paragraph"> |
| <p>This mixin calls <a href="#refguide:applib-svc:MetamodelService.adoc" class="page unresolved"><code>MetaModelService</code></a> and the <a href="../../applib-svc/GridService.html" class="page"><code>GridService</code></a> to invalidate their caches.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="openrestapi"><a class="anchor" href="#openrestapi"></a><code>openRestApi()</code></h3> |
| <div class="paragraph"> |
| <p>The <code>Object_openRestApi</code> mixin provides an action to navigate to the URL of the <a href="../../../../vro/2.0.0-M3/about.html" class="page">Restful Objects resource</a> corresponding to the domain object. |
| It has the following signature:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public URL openRestApi() { /* ... */ }</code></pre> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="related-services-4"><a class="anchor" href="#related-services-4"></a>Related Services</h4> |
| <div class="paragraph"> |
| <p>This mixin calls <a href="../../applib-svc/BookmarkService.html" class="page"><code>BookmarkService</code></a> to build the URL.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="Dto"><a class="anchor" href="#Dto"></a><code>Dto</code></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>Dto</code> role interface is intended to be implemented by JAXB-annotated view models, that is, annotated using |
| <a href="../../applib-ant/XmlRootElement.html" class="page"><code>@XmlRootElement</code></a>. |
| It enables the ability to download the XML and XSD schema of those objects using two <a href="../../../../userguide/2.0.0-M3/fun/overview.html#mixins" class="page">mixins</a>, <code>Dto_downloadXml</code> and <code>Dto_downloadXsd</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The interface is just a marker interface (with no members), and is defined as:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public interface Dto { }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>Dto_downloadXml</code> mixin defines the following action:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Mixin(method="act") |
| public class Dto_downloadXml { |
| |
| public Dto_downloadXml(final Dto dto) { <i class="conum" data-value="1"></i><b>(1)</b> |
| // ... |
| } |
| public Object act(final String fileName) { <i class="conum" data-value="2"></i><b>(2)</b> |
| // ... |
| } |
| |
| // ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>provided as an action to any class that (trivially) implements the <code>Dto</code> interface</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>The action’s name is derived from the class name.</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>This will return the XML text wrapped up in a <a href="../about.html#Clob" class="page"><code>Clob</code></a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>Dto_downloadXsd</code> mixin is similar:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Mixin(method="act") |
| public class Dto_downloadXsd { |
| public Dto_downloadXsd(final Dto dto) { /* ... */ } <i class="conum" data-value="1"></i><b>(1)</b> |
| public Object act(final String fileName, final IsisSchemes isisSchemas) { /* ... */ } <i class="conum" data-value="2"></i><b>(2)</b> |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>provided as an action to any class that (trivially) implements the <code>Dto</code> interface</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>The action’s name be derived from the class name.</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>If the domain object’s JAXB annotations reference only a single XSD schema then this will return that XML text as a <a href="../about.html#Clob" class="page"><code>Clob</code></a> of that XSD. |
| If there are multiple XSD schemas referenced then the action will return a zip of those schemas, wrapped up in a <a href="../about.html#Blob" class="page"><code>Blob</code></a>. |
| The <code>IsisSchemas</code> parameter to the action can be used to optionally ignore the common <a href="../../schema/about.html" class="page">Apache Isis schemas</a> (useful if there is only one other XSD schema referenced by the DTO).</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="related-services-5"><a class="anchor" href="#related-services-5"></a>Related Services</h3> |
| <div class="paragraph"> |
| <p>The <code>Dto_downloadXml</code> and <code>Dto_downloadXsd</code> delegate to the <a href="../../applib-svc/JaxbService.html" class="page"><code>JaxbService</code></a> to actually generate the XML/XSD.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="Persistable"><a class="anchor" href="#Persistable"></a><code>Persistable</code></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>All domain entities automatically implement the DataNucleus <code>Persistable</code> role interface as a result of the enhancer process (the fully qualified class name is <code>org.datanucleus.enhancement.Persistable</code>). |
| So as a developer you do not need to write any code to obtain the mixins that contribute to this interface.</p> |
| </div> |
| <div class="paragraph"> |
| <p>These mixin properties/actions are all associated with the "Metadata" fieldset. |
| A number of other <a href="../about.html#Object" class="page">mixins</a> also contribute properties or actions to the "Metadata" fieldset.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="downloadJdoMetadata"><a class="anchor" href="#downloadJdoMetadata"></a><code>downloadJdoMetadata()</code></h3> |
| <div class="paragraph"> |
| <p>The <code>Persistable_downloadJdoMetadata</code> mixin provides an action which allows the JDO <a href="http://www.datanucleus.org/products/datanucleus/jdo/metadata_xml.html">class metadata</a> to be downloaded as XML. |
| It has the following signature:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public Clob downloadJdoMetadata( <i class="conum" data-value="1"></i><b>(1)</b> |
| |
| @ParameterLayout(named = ".jdo file name") |
| final String fileName) { |
| // ... |
| } |
| |
| // ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>returns the XML text wrapped up in a <a href="../about.html#Clob" class="page"><code>Clob</code></a>.</td> |
| </tr> |
| </table> |
| </div> |
| <div class="sect3"> |
| <h4 id="related-services-6"><a class="anchor" href="#related-services-6"></a>Related Services</h4> |
| <div class="paragraph"> |
| <p>The mixin delegates to the <a href="../../../../pjdo/2.0.0-M3/services/IsisJdoSupport.html" class="page"><code>IsisJdoSupport</code></a> service to obtain a reference to the JDO <code>PersistenceManagerFactory</code>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="datanucleusXxx"><a class="anchor" href="#datanucleusXxx"></a><code>datanucleusXxx</code></h3> |
| <div class="paragraph"> |
| <p>The framework provides a number of mixins that expose the datanucleus Id and version of a persistable domain entity. |
| Several implementations are provided to support different datatypes:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>Persistable_datanucleusIdLong</code> will expose the entity’s id, assuming that the id is or can be cast to <code>java.lang.Long</code>. |
| Otherwise the property will be hidden.</p> |
| </li> |
| <li> |
| <p><code>Persistable_datanucleusVersionTimestamp</code> will expose the entity’s version, assuming that the version is or can be cast to <code>java.sql.Timestamp</code>. |
| Otherwise the property will be hidden.</p> |
| </li> |
| <li> |
| <p><code>Persistable_datanucleusVersionLong</code> will expose the entity’s version, assuming that the version is or can be cast to <code>java.lang.Long</code>. |
| Otherwise the property will be hidden.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
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