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| <h1 id="stereotypes">Stereotypes<a class="headerlink" href="#stereotypes" title="Permanent link">¶</a></h1> |
| <p><em>Stereotypes are user-defined marker annotations allowing to group other annotations together. iPOJO recognize these annotations and act as if all the grouped annotations were directly decorating the stereotyped annotation support.</em></p> |
| <div class="toc"> |
| <ul> |
| <li><a href="#stereotypes">Stereotypes</a><ul> |
| <li><a href="#example">Example</a></li> |
| <li><a href="#when-using-a-stereotype">When using a stereotype ?</a></li> |
| </ul> |
| </li> |
| <li><a href="#defining-a-stereotype">Defining a Stereotype</a></li> |
| <li><a href="#using-the-new-stereotype">Using the new stereotype</a><ul> |
| <li><a href="#manipulation">Manipulation</a><ul> |
| <li><a href="#with-bnd-ipojo-plugin">With bnd-ipojo-plugin</a></li> |
| <li><a href="#with-others">With others</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <h2 id="example">Example<a class="headerlink" href="#example" title="Permanent link">¶</a></h2> |
| <p>The <code>@AutoComponent</code> is a stereotyped annotation (notice the <code>@Stereotype</code>) that will act as a 'container' for <code>@Component</code> and <code>@Instantiate</code>.</p> |
| <div class="codehilite"><pre><span class="nd">@Component</span> |
| <span class="nd">@Instantiate</span> |
| <span class="nd">@Stereotype</span> |
| <span class="nd">@Target</span><span class="o">(</span><span class="n">TYPE</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="nd">@interface</span> <span class="n">AutoComponent</span> <span class="o">{}</span> |
| </pre></div> |
| |
| |
| <p>The <code>MyComponent</code> class will be considered as a component with an instance.</p> |
| <div class="codehilite"><pre><span class="nd">@AutoComponent</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">MyComponent</span> <span class="o">{</span> |
| <span class="c1">// ...</span> |
| <span class="o">}</span> |
| </pre></div> |
| |
| |
| <h2 id="when-using-a-stereotype">When using a stereotype ?<a class="headerlink" href="#when-using-a-stereotype" title="Permanent link">¶</a></h2> |
| <p>Stereotypes are useful when writing extension of the iPOJO programming model. Sometimes, to keep things simple for the user, its necessary to hide some parts of iPOJO.</p> |
| <p>For example, a new programming model could mandates to have one-to-one factory/instance relationship. With iPOJO's programming model, writing <code>@Component</code> and <code>@Instantiate</code> (if using annotation) is required, this may be error prone when writing the new components: the developer could miss one annotation or the other.</p> |
| <p>Another example is to simplify annotation declaration when an annotation pattern appears (the same annotations group on many places of the code). Typically, introducing a stereotype defines a 'kind' that can be reused (code factorisation).</p> |
| <h1 id="defining-a-stereotype">Defining a Stereotype<a class="headerlink" href="#defining-a-stereotype" title="Permanent link">¶</a></h1> |
| <p>Stereotyped annotations, unlike custom handler annotations, do not need to be in a package containing either <code>ipojo</code> or <code>handler</code>. They just need to be annotated with <code>@Stereotype</code> (since iPOJO annotations 1.10.1) and have a class level rentention policy (the default when <code>@Retention</code> is missing). Any <code>@Target</code> can be specified (<code>TYPE</code>, <code>METHOD</code>, <code>FIELD</code>, <code>CONSTRUCTOR</code> and <code>ANNOTATION_TYPE</code> are supported), dependeding on the stereotype's semantic.</p> |
| <p>A stereotyped annotation can support all of the regular iPOJO's annotations plus all other externally supported types (custom handler, manipulator binding extensions, ...).</p> |
| <div class="codehilite"><pre><span class="kn">import</span> <span class="nn">com.acme.app.ipojo.Custom</span><span class="o">;</span> <span class="c1">// Import a custom handler annotation</span> |
| |
| <span class="nd">@Component</span> <span class="c1">// Use standard iPOJO annotation</span> |
| <span class="nd">@Custom</span> <span class="c1">// Use the custome annotation</span> |
| <span class="nd">@HandlerDeclaration</span><span class="o">(</span><span class="s">"<ns:handler xmlns:ns='com.acme.app'/>"</span><span class="o">)</span> |
| <span class="nd">@Stereotype</span> |
| <span class="nd">@Target</span><span class="o">(</span><span class="n">TYPE</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="nd">@interface</span> <span class="n">AutoComponent</span> <span class="o">{}</span> |
| </pre></div> |
| |
| |
| <p>The stereotype developer needs to declare a compile time dependency on the ipojo annotations module:</p> |
| <div class="codehilite"><pre><span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.felix<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>org.apache.felix.ipojo.annotations<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>${ipojo.version}<span class="nt"></version></span> <span class="c"><!-- Since 1.10.1 --></span> |
| <span class="nt"><scope></span>provided<span class="nt"></scope></span> |
| <span class="nt"></dependency></span> |
| </pre></div> |
| |
| |
| <div class="alert alert-info info" markdown="1"> |
| <h4>Type and manipulation</h4> |
| <p>The artifact containing the stereotyped annotation *does not need* to be a bundle and it does not need to be manipulated.</p> |
| </div> |
| |
| <h1 id="using-the-new-stereotype">Using the new stereotype<a class="headerlink" href="#using-the-new-stereotype" title="Permanent link">¶</a></h1> |
| <p>Using a stereotyped annotation does not differ from using any annotation: it has decorate some type, method, field, ...</p> |
| <h2 id="manipulation">Manipulation<a class="headerlink" href="#manipulation" title="Permanent link">¶</a></h2> |
| <p>Stereotype support needs iPOJO manipulator 1.10.1 (at least).</p> |
| <p>During the manipulation, the system search for all annotation definitions to find if they are @Stereotype annotated or not.</p> |
| <p>If the stereotyped annotation is directly in the manipulated module, no problems: any front-end will work as expected.</p> |
| <p>If not, the different manipulator's front-end have variable support for the stereotype feature.</p> |
| <h3 id="with-bnd-ipojo-plugin">With bnd-ipojo-plugin<a class="headerlink" href="#with-bnd-ipojo-plugin" title="Permanent link">¶</a></h3> |
| <p>The more advanced support for stereotypes.</p> |
| <p>The plugin inspect <em>maven project's dependencies</em> provided to Bnd as its classpath to find stereotyped annotations definition.</p> |
| <h3 id="with-others">With others<a class="headerlink" href="#with-others" title="Permanent link">¶</a></h3> |
| <p>No dependencies are analyzed at the moment.</p> |
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| Rev. 1700393 by cziegeler on Tue, 1 Sep 2015 06:04:06 +0000 |
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