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From "Justin Edelson (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache Sling > YAMF - Yet Another Model Factory
Date Thu, 19 Dec 2013 17:38:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~justinedelson " style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Justin Edelson</a> edited the page:
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                                                    <td valign="top" style="font-size: 13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height: 20px; margin: 0; padding: 0"> <a href="https://cwiki.apache.org/confluence/display/SLING/YAMF+-+Yet+Another+Model+Factory" style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon" alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" /> <strong style="font-size:16px;line-height:20px;vertical-align:top;">YAMF - Yet Another Model Factory</strong> </a> </h2> </td>
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                                                    <p class="diff-context-placeholder" style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size: 13px">YAMF is an attempt to consolidate the various approaches I have seen to this problem.</p>
                                                    <p class="diff-block-target diff-block-context" style="font-size: 13px"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span> </p>
                                                    <h1 id="YAMF-YetAnotherModelFactory-DesignGoals" class="diff-block-target diff-block-context"> <span style="line-height: 1.25;"><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">Design Goals</span></span> </h1>
                                                    <p class="diff-context-placeholder" style="font-size: 13px">...</p>
                                                    <h1 id="YAMF-YetAnotherModelFactory-DesignGoals" class="diff-block-target diff-block-context"></h1>
                                                    <ul class="diff-block-context">
                                                        <li style="font-size: 13px"> <span>Entirely annotation driven. &quot;Pure&quot; POJOs.</span> </li>
                                                        <li style="font-size: 13px"> <span>Use standard annotations where possible.</span> </li>
                                                        <li style="font-size: 13px"> <span>Pluggable</span> </li>
                                                        <li style="font-size: 13px"> <span>OOTB, support resource properties (via ValueMap), SlingBindings, OSGi services, request attributes</span> </li>
                                                        <li style="font-size: 13px"> <span>Adapt multiple objects - minimal required Resource and SlingHttpServletRequest</span> </li>
                                                        <li style="font-size: 13px"> <span>Client doesn't know/care that YAMF is involved</span> </li>
                                                        <li style="font-size: 13px"> <span>Support both classes and interfaces.</span> </li>
                                                        <li style="font-size: 13px"> <span>Work with existing Sling infrastructure (i.e. not require changes to other bundles).</span> </li>
                                                    </ul>
                                                    <h1 id="YAMF-YetAnotherModelFactory-BasicUsage" class="diff-block-target"> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Basic Usage</span> </h1>
                                                    <p class="diff-block-target diff-block-context" style="font-size: 13px">In the simplest case, the class is annotated with @Model and the adaptable class. Fields which need to be injected are annotated with @Inject:<span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; private String propertyName;
}</pre> </td>
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                                                    <p class="diff-block-target" style="font-size: 13px"> <span><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> <span>In this case, a property named 'propertyName' will be looked up from the Resource (after first adapting it to a ValueMap) and it is injected.</span> <br /> <span>&nbsp;</span> <br /> <span>For an interface, it is similar:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public interface MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp; &nbsp; String getPropertyName();
}</pre> </td>
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                                                    <p class="diff-block-context" style="font-size: 13px"> <span><span> <br /> </span></span> </p>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> <span>In order for these classes to be picked up, there is a header which must be added to the bundle's manifest:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">&lt;Sling-YAMF-Packages&gt;
  org.apache.sling.yamf.it.models
&lt;/Sling-YAMF-Packages&gt;&nbsp;</pre> </td>
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                                                    <p class="diff-context-placeholder" style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size: 13px"> <span><span> <br /> </span></span> </p>
                                                    <h1 id="YAMF-YetAnotherModelFactory-ClientCode" class="diff-block-target diff-block-context"> <span><span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Client Code</span></span></span> </h1>
                                                    <p class="diff-block-target diff-block-context" style="font-size: 13px"> <span><span><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Client code doesn't need to be aware that YAMF is being used. It just uses the Sling Adapter framework:</span></span></span> </p>
                                                    <p class="diff-block-context" style="font-size: 13px"> <span><span> <br /> </span></span> </p>
                                                    <p class="diff-block-context" style="font-size: 13px"> <span><span> <br /> </span></span> </p>
                                                    <h1 id="YAMF-YetAnotherModelFactory-OtherOptions" class="diff-block-target diff-block-context"> <span><span><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Other Options</span></span></span> </h1>
                                                    <p class="diff-block-target diff-block-context" style="font-size: 13px"> <span><span>If the field or method name doesn't exactly match the property name, @Named can be used:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-8" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject @Named(&quot;secondPropertyName&quot;)
&nbsp;&nbsp;&nbsp; private String otherName;
}&nbsp;
&nbsp;</pre> </td>
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                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>@Injected fields/methods are assumed to be required. To mark them as optional, use @Optional:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-9" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
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                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject @Optional
&nbsp;&nbsp;&nbsp; private String otherName;
}
&nbsp;</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>OSGi services can be injected:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-10" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
                                                    <table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
                                                            </tr>
                                                        </thead>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
                                                                            </tr>
                                                                        </tbody>
                                                                    </table> </td>
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                                                        </tbody>
                                                        <tbody>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; private ResourceResolverFactory resourceResolverFactory;
}&nbsp;</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>&nbsp;</span> <br /> <span>In this case, the name is not used -- only the class name. Lists and arrays are supported:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-11" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
                                                    <table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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                                                                <td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
                                                                            </tr>
                                                                        </tbody>
                                                                    </table> </td>
                                                            </tr>
                                                        </tbody>
                                                        <tbody>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=Resource.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; private List&lt;Servlet&gt; servlets;
}</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>&nbsp;</span> <br /> <span>OSGi injection can be filtered:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-12" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
                                                    <table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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                                                        </thead>
                                                        <tbody>
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                                                                <td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
                                                                            </tr>
                                                                        </tbody>
                                                                    </table> </td>
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                                                        </tbody>
                                                        <tbody>
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                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=SlingHttpServletRequest.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; private PrintWriter out;
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; @Named(&quot;log&quot;)
&nbsp;&nbsp;&nbsp; private Logger logger;
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; @Filter(&quot;paths=/bin/something&quot;)
&nbsp;&nbsp;&nbsp; private List&lt;Servlet&gt; servlets;
}</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>&nbsp;</span> <br /> <span>The @PostConstruct annotation can be used to add methods which are invoked upon completion of all injections:</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-13" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
                                                    <table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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                                                        </thead>
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                                                                <td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
                                                                            </tr>
                                                                        </tbody>
                                                                    </table> </td>
                                                            </tr>
                                                        </tbody>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=SlingHttpServletRequest.class)
public class MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; private PrintWriter out;
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject
&nbsp;&nbsp;&nbsp; @Named(&quot;log&quot;)
&nbsp;&nbsp;&nbsp; private Logger logger;
&nbsp;
&nbsp; &nbsp; @PostConstruct
&nbsp; &nbsp; protected void sayHello() {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;logger.info(&quot;hello&quot;);
&nbsp; &nbsp; }
}
&nbsp;</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-target" style="font-size: 13px"> <span> <br /> <span>@PostConstruct methods in a super class will be invoked first.</span> <br /> <span>&nbsp;</span> <br /> <span>Using projection, you can inject based on a &quot;child&quot; object of the adaptable.&nbsp;</span> <br /> <span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span><span class="diff-html-removed" id="removed-diff-14" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span></span> <br /> </span> </p>
                                                    <table class="diff-macro diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
                                                            </tr>
                                                        </thead>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">language</td>
                                                                                <td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
                                                                            </tr>
                                                                        </tbody>
                                                                    </table> </td>
                                                            </tr>
                                                        </tbody>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">@Model(adaptables=SlingHttpServletRequest.class)
public interface MyModel {
&nbsp;
&nbsp;&nbsp;&nbsp; @Inject @Projection(&quot;resource&quot;)
&nbsp; &nbsp; String getPropertyName();
}&nbsp;</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-context-placeholder" style="font-size: 13px">...</p>
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