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     <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/prepare-interceptor.md" title="Edit this page on GitHub">Edit on GitHub</a>

     <a href="interceptors.html" title="back to Interceptors"><< back to Interceptors</a>

     <h1 id="prepare-interceptor">Prepare Interceptor</h1>

 <p>This interceptor calls <code class="language-plaintext highlighter-rouge">prepare()</code> on actions which implement <code class="language-plaintext highlighter-rouge">Preparable</code>. This interceptor is very useful for any
 situation where you need to ensure some logic runs before the actual execute method runs.</p>

 <p>A typical use of this is to run some logic to load an object from the database so that when parameters are set they can
 be set on this object. For example, suppose you have a User object with two properties: <code class="language-plaintext highlighter-rouge">id</code> and <code class="language-plaintext highlighter-rouge">name</code>. Provided that
 the params interceptor is called twice (once before and once after this interceptor), you can load the User object using
 the <code class="language-plaintext highlighter-rouge">id</code> property and then when the second params interceptor is called the parameter <code class="language-plaintext highlighter-rouge">user.name</code> will be set, as desired,
 on the actual object loaded from the database. See the example for more info.</p>

 <blockquote>
   <p>Note: Since XWork 2.0.2, this interceptor extends <code class="language-plaintext highlighter-rouge">MethodFilterInterceptor</code>, therefore being able to deal with
 <code class="language-plaintext highlighter-rouge">excludeMethods</code> / <code class="language-plaintext highlighter-rouge">includeMethods</code> parameters. See <a href="default-workflow-interceptor">Workflow Interceptor</a>
 for documentation and examples on how to use this feature.</p>
 </blockquote>

 <blockquote>
   <p>Update: Added logic to execute a <code class="language-plaintext highlighter-rouge">prepare&lt;MethodName&gt;</code> and conditionally the a general <code class="language-plaintext highlighter-rouge">prepare()</code> Method, depending
 on the <code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> parameter/property which is by default <code class="language-plaintext highlighter-rouge">true</code>. This allows us to run some logic based
 on the method name we specify in the <code class="language-plaintext highlighter-rouge">com.opensymphony.xwork2.ActionProxy</code>. For example, you can specify a <code class="language-plaintext highlighter-rouge">prepareInput()</code>
 method that will be run before the invocation of the input method.</p>
 </blockquote>

 <p>In <code class="language-plaintext highlighter-rouge">PrepareInterceptor</code> applies only when action implements <code class="language-plaintext highlighter-rouge">Preparable</code></p>
 <ol>
   <li>if the action class have <code class="language-plaintext highlighter-rouge">prepare&lt;MethodName&gt;()</code>, it will be invoked</li>
   <li>else if the action class have <code class="language-plaintext highlighter-rouge">prepareDo&lt;MethodName&gt;()</code>, it will be invoked</li>
   <li>no matter if 1] or 2] is performed, if <code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> property of the interceptor is <code class="language-plaintext highlighter-rouge">true</code> (which is by
    default <code class="language-plaintext highlighter-rouge">true</code>), <code class="language-plaintext highlighter-rouge">prepare()</code> will be invoked.</li>
 </ol>

 <h2 id="parameters">Parameters</h2>

 <ul>
   <li><code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> - Default to true. If true, prepare will always be invoked, otherwise it will not.</li>
 </ul>

 <h2 id="extending-the-interceptor">Extending the Interceptor</h2>

 <p>There are no known extension points to this interceptor.</p>

 <h2 id="examples">Examples</h2>

 <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="c">&lt;!-- Calls the params interceptor twice, allowing you to
        pre-load data for the second time parameters are set --&gt;</span>
   <span class="nt">&lt;action</span> <span class="na">name=</span><span class="s">"someAction"</span> <span class="na">class=</span><span class="s">"com.examples.SomeAction"</span><span class="nt">&gt;</span>
       <span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"params"</span><span class="nt">/&gt;</span>
       <span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"prepare"</span><span class="nt">/&gt;</span>
       <span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"basicStack"</span><span class="nt">/&gt;</span>
       <span class="nt">&lt;result</span> <span class="na">name=</span><span class="s">"success"</span><span class="nt">&gt;</span>good_result.ftl<span class="nt">&lt;/result&gt;</span>
   <span class="nt">&lt;/action&gt;</span>
 </code></pre></div></div>

   </section>
 </article>


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	<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/prepare-interceptor.md" title="Edit this page on GitHub">Edit on GitHub</a>

	<a href="interceptors.html" title="back to Interceptors"><< back to Interceptors</a>

	<h1 id="prepare-interceptor">Prepare Interceptor</h1>

	<p>This interceptor calls <code class="language-plaintext highlighter-rouge">prepare()</code> on actions which implement <code class="language-plaintext highlighter-rouge">Preparable</code>. This interceptor is very useful for any
	situation where you need to ensure some logic runs before the actual execute method runs.</p>

	<p>A typical use of this is to run some logic to load an object from the database so that when parameters are set they can
	be set on this object. For example, suppose you have a User object with two properties: <code class="language-plaintext highlighter-rouge">id</code> and <code class="language-plaintext highlighter-rouge">name</code>. Provided that
	the params interceptor is called twice (once before and once after this interceptor), you can load the User object using
	the <code class="language-plaintext highlighter-rouge">id</code> property and then when the second params interceptor is called the parameter <code class="language-plaintext highlighter-rouge">user.name</code> will be set, as desired,
	on the actual object loaded from the database. See the example for more info.</p>

	<blockquote>
	<p>Note: Since XWork 2.0.2, this interceptor extends <code class="language-plaintext highlighter-rouge">MethodFilterInterceptor</code>, therefore being able to deal with
	<code class="language-plaintext highlighter-rouge">excludeMethods</code> / <code class="language-plaintext highlighter-rouge">includeMethods</code> parameters. See <a href="default-workflow-interceptor">Workflow Interceptor</a>
	for documentation and examples on how to use this feature.</p>
	</blockquote>

	<blockquote>
	<p>Update: Added logic to execute a <code class="language-plaintext highlighter-rouge">prepare<MethodName></code> and conditionally the a general <code class="language-plaintext highlighter-rouge">prepare()</code> Method, depending
	on the <code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> parameter/property which is by default <code class="language-plaintext highlighter-rouge">true</code>. This allows us to run some logic based
	on the method name we specify in the <code class="language-plaintext highlighter-rouge">com.opensymphony.xwork2.ActionProxy</code>. For example, you can specify a <code class="language-plaintext highlighter-rouge">prepareInput()</code>
	method that will be run before the invocation of the input method.</p>
	</blockquote>

	<p>In <code class="language-plaintext highlighter-rouge">PrepareInterceptor</code> applies only when action implements <code class="language-plaintext highlighter-rouge">Preparable</code></p>
	<ol>
	<li>if the action class have <code class="language-plaintext highlighter-rouge">prepare<MethodName>()</code>, it will be invoked</li>
	<li>else if the action class have <code class="language-plaintext highlighter-rouge">prepareDo<MethodName>()</code>, it will be invoked</li>
	<li>no matter if 1] or 2] is performed, if <code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> property of the interceptor is <code class="language-plaintext highlighter-rouge">true</code> (which is by
	default <code class="language-plaintext highlighter-rouge">true</code>), <code class="language-plaintext highlighter-rouge">prepare()</code> will be invoked.</li>
	</ol>

	<h2 id="parameters">Parameters</h2>

	<ul>
	<li><code class="language-plaintext highlighter-rouge">alwaysInvokePrepare</code> - Default to true. If true, prepare will always be invoked, otherwise it will not.</li>
	</ul>

	<h2 id="extending-the-interceptor">Extending the Interceptor</h2>

	<p>There are no known extension points to this interceptor.</p>

	<h2 id="examples">Examples</h2>

	<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="c"><!-- Calls the params interceptor twice, allowing you to
	pre-load data for the second time parameters are set --></span>
	<span class="nt"><action</span> <span class="na">name=</span><span class="s">"someAction"</span> <span class="na">class=</span><span class="s">"com.examples.SomeAction"</span><span class="nt">></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"params"</span><span class="nt">/></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"prepare"</span><span class="nt">/></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"basicStack"</span><span class="nt">/></span>
	<span class="nt"><result</span> <span class="na">name=</span><span class="s">"success"</span><span class="nt">></span>good_result.ftl<span class="nt"></result></span>
	<span class="nt"></action></span>
	</code></pre></div></div>

	</section>
	</article>


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