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<h1>9. Completion Contributor</h1>
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<p>The easiest way to provide completion is to use a completion contributor.</p>
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<a name="define-a-completion-contributor" class="elem-anchor"></a>
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<h3>9.1. Define a completion contributor<a href="#define-a-completion-contributor" class="anchor-link"><span></span></a></h3>
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<p>Let’s provide custom completion for values in property files.</p>
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<pre><code class="code-block__wrapper code-block _highlighted lang_java"><span class="kn">package</span> <span class="n">com</span><span class="o">.</span><span class="na">simpleplugin</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">com.intellij.codeInsight.completion.*</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">com.intellij.codeInsight.lookup.LookupElementBuilder</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">com.intellij.patterns.PlatformPatterns</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">com.intellij.util.ProcessingContext</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">com.simpleplugin.psi.SimpleTypes</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">org.jetbrains.annotations.NotNull</span><span class="o">;</span>
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<span class="kd">public</span> <span class="kd">class</span> <span class="nc">SimpleCompletionContributor</span> <span class="kd">extends</span> <span class="n">CompletionContributor</span> <span class="o">{</span>
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<span class="kd">public</span> <span class="nf">SimpleCompletionContributor</span><span class="o">()</span> <span class="o">{</span>
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<span class="n">extend</span><span class="o">(</span><span class="n">CompletionType</span><span class="o">.</span><span class="na">BASIC</span><span class="o">,</span>
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<span class="n">PlatformPatterns</span><span class="o">.</span><span class="na">psiElement</span><span class="o">(</span><span class="n">SimpleTypes</span><span class="o">.</span><span class="na">VALUE</span><span class="o">).</span><span class="na">withLanguage</span><span class="o">(</span><span class="n">SimpleLanguage</span><span class="o">.</span><span class="na">INSTANCE</span><span class="o">),</span>
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<span class="k">new</span> <span class="n">CompletionProvider</span><span class="o"><</span><span class="n">CompletionParameters</span><span class="o">>()</span> <span class="o">{</span>
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<span class="kd">public</span> <span class="kt">void</span> <span class="nf">addCompletions</span><span class="o">(</span><span class="nd">@NotNull</span> <span class="n">CompletionParameters</span> <span class="n">parameters</span><span class="o">,</span>
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<span class="n">ProcessingContext</span> <span class="n">context</span><span class="o">,</span>
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<span class="nd">@NotNull</span> <span class="n">CompletionResultSet</span> <span class="n">resultSet</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">resultSet</span><span class="o">.</span><span class="na">addElement</span><span class="o">(</span><span class="n">LookupElementBuilder</span><span class="o">.</span><span class="na">create</span><span class="o">(</span><span class="s">"Hello"</span><span class="o">));</span>
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<span class="o">}</span>
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<span class="o">}</span>
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<span class="o">);</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</code></pre>
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<a name="register-the-completion-contributor" class="elem-anchor"></a>
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<h3>9.2. Register the completion contributor<a href="#register-the-completion-contributor" class="anchor-link"><span></span></a></h3>
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<pre><code class="code-block__wrapper code-block _highlighted lang_xml"><span class="nt"><completion.contributor</span> <span class="na">language=</span><span class="s">"Simple"</span> <span class="na">implementationClass=</span><span class="s">"com.simpleplugin.SimpleCompletionContributor"</span><span class="nt">/></span>
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</code></pre>
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<a name="run-the-project" class="elem-anchor"></a>
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<h3>9.3. Run the project<a href="#run-the-project" class="anchor-link"><span></span></a></h3>
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<p><img src="img/completion.png" alt="Completion" /></p>
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<p><a href="line_marker_provider.html"><span>Previous</span></a>
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<div class="last-modified">
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Last modified: 28 December 2015
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