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| <h1 class="page"><code>@XmlRootElement</code> (<code>jaxb</code>)</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>@XmlRootElement</code> annotation provides an alternative way to define a <a href="../../../userguide/2.0.0-M6/fun/overview.html#view-models" class="page">view model</a>, in particular one intended to act as a DTO for use within <a href="../../../vro/2.0.0-M6/about.html" class="page">RestfulObjects viewer</a>, or which contains arbitrarily complex state.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A view model is a non-persisted domain object whose state is converted to/from a string memento. |
| In the case of a JAXB-annotated object this memento is its XML representation. |
| JAXB generally requires that the root element of the XML representation is annotated with <code>@XmlRootElement</code>. |
| Apache Isis makes this a mandatory requirement.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In comparison to using either the <a href="../applib/index/ViewModel.html" class="page">ViewModel</a> interface or the |
| <a href="../applib/index/annotation/DomainObject.html" class="page">@DomainObject(nature=VIEW_MODEL)</a> annotation, |
| using <code>@XmlRootElement</code> has a couple of significant advantages:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>the view model can be used as a "canonical" DTO, for example when accessing data using the <a href="../../../vro/2.0.0-M6/about.html" class="page">RestfulObjects viewer</a> in combination with the |
| <a href="../applib/index/services/conmap/ContentMappingService.html" class="page">ContentMappingService</a>.</p> |
| <div class="paragraph"> |
| <p>This provides a stable and versioned API to access data in XML format using whatever client-side technology may be appropriate.</p> |
| </div> |
| </li> |
| <li> |
| <p>the XML graph can be as deep as required; in particular it can contain collections of other objects.</p> |
| <div class="paragraph"> |
| <p>In contrast, if the <code>@DomainObject(nature=VIEW_MODEL)</code> annotation is used then only the state of the properties (not collections) is captured. |
| If using <code>ViewModel</code> interface then arbitrary state (including that of collections), however the programmer must write all the code by hand</p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The main disadvantages of using JAXB-annotated view models is that any referenced persistent entity must be annotated with the <a href="XmlJavaTypeAdapter.html" class="page">@XmlJavaTypeAdapter</a>, using the framework-provided <code>PersistentEntityAdapter</code>. |
| This adapter converts any references to such domain entities using the <code>oidDto</code> complex type (as defined by the Apache Isis <a href="../schema/common.html" class="page">common schema</a>): the object’s type and its identifier.</p> |
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| <td class="content"> |
| <div class="paragraph"> |
| <p>The memento string for view models is converted into a form compatible with use within a URL. |
| This is performed by the <a href="../applib/index/services/urlencoding/UrlEncodingService.html" class="page">UrlEncodingService</a>, the default implementation of which simply encodes to base 64. If the view model XML graph is too large to be serialized to a string, then an alternative implementation (eg which maps XML strings to a GUID, say) can be configured using the technique described in <a href="../../../userguide/2.0.0-M6/btb/about.html#replacing-default-service-implementations" class="page">here</a> in the user guide.</p> |
| </div> |
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| </div> |
| <div class="sect1"> |
| <h2 id="example"><a class="anchor" href="#example"></a>Example</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@XmlRootElement(name = "toDoItemDto") <i class="conum" data-value="1"></i><b>(1)</b> |
| public class ToDoItemDto implements Dto { |
| @Getter @Setter <i class="conum" data-value="2"></i><b>(2)</b> |
| protected String description; |
| @Getter @Setter |
| protected String category; |
| @Getter @Setter |
| protected String subcategory; |
| @Getter @Setter |
| protected BigDecimal cost; |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>identifies this class as a view model and defines the root element for JAXB serialization</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>using Project Lombok for getters and setters</td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="see-also"><a class="anchor" href="#see-also"></a>See also</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Although (like any other viewmodel) a JAXB-annotated can have behaviour (actions) and UI hints, you may wish to keep the DTO "clean", just focused on specifying the data contract.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Behaviour can therefore be provided using <a href="../../../userguide/2.0.0-M6/fun/overview.html#mixins" class="page">mixins</a> (annotated with <a href="../applib/index/annotation/DomainObject.html" class="page">@DomainObject(nature=MIXIN)</a>), while <a href="#applib-classes:classes/uievent.adoc" class="page unresolved">UI events</a> can be used to obtain title, icons and so on.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For a more complete discussion of writing JAXB view models/DTOs, see <a href="../../../userguide/2.0.0-M6/fun/overview.html#view-models" class="page">this topic</a> in the user guide.</p> |
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