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| <h2 title="Interface Interceptor" class="title">Interface Interceptor</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../com/opensymphony/xwork2/interceptor/AbstractInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">AbstractInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/spring/interceptor/ActionAutowiringInterceptor.html" title="class in com.opensymphony.xwork2.spring.interceptor">ActionAutowiringInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/ActionMappingParametersInterceptor.html" title="class in org.apache.struts2.interceptor">ActionMappingParametersInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/AliasInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">AliasInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/annotations/AnnotationParameterFilterInterceptor.html" title="class in com.opensymphony.xwork2.interceptor.annotations">AnnotationParameterFilterInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/validation/AnnotationValidationInterceptor.html" title="class in org.apache.struts2.interceptor.validation">AnnotationValidationInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/annotations/AnnotationWorkflowInterceptor.html" title="class in com.opensymphony.xwork2.interceptor.annotations">AnnotationWorkflowInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ChainingInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ChainingInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/CheckboxInterceptor.html" title="class in org.apache.struts2.interceptor">CheckboxInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/ClearSessionInterceptor.html" title="class in org.apache.struts2.interceptor">ClearSessionInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ConversionErrorInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ConversionErrorInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/CookieInterceptor.html" title="class in org.apache.struts2.interceptor">CookieInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/CookieProviderInterceptor.html" title="class in org.apache.struts2.interceptor">CookieProviderInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/CreateSessionInterceptor.html" title="class in org.apache.struts2.interceptor">CreateSessionInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/DateTextFieldInterceptor.html" title="class in org.apache.struts2.interceptor">DateTextFieldInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/debugging/DebuggingInterceptor.html" title="class in org.apache.struts2.interceptor.debugging">DebuggingInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/DefaultWorkflowInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">DefaultWorkflowInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ExceptionMappingInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ExceptionMappingInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/ExecuteAndWaitInterceptor.html" title="class in org.apache.struts2.interceptor">ExecuteAndWaitInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/FileUploadInterceptor.html" title="class in org.apache.struts2.interceptor">FileUploadInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/I18nInterceptor.html" title="class in org.apache.struts2.interceptor">I18nInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/LoggingInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">LoggingInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/MessageStoreInterceptor.html" title="class in org.apache.struts2.interceptor">MessageStoreInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/MethodFilterInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">MethodFilterInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/mock/MockInterceptor.html" title="class in com.opensymphony.xwork2.mock">MockInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ModelDrivenInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ModelDrivenInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/MultiselectInterceptor.html" title="class in org.apache.struts2.interceptor">MultiselectInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/NoOpInterceptor.html" title="class in org.apache.struts2.interceptor">NoOpInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ParameterFilterInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ParameterFilterInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ParameterRemoverInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ParameterRemoverInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ParametersInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ParametersInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/PrepareInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">PrepareInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/RolesInterceptor.html" title="class in org.apache.struts2.interceptor">RolesInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/ScopedModelDrivenInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">ScopedModelDrivenInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/ScopeInterceptor.html" title="class in org.apache.struts2.interceptor">ScopeInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/ServletConfigInterceptor.html" title="class in org.apache.struts2.interceptor">ServletConfigInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/interceptor/StaticParametersInterceptor.html" title="class in com.opensymphony.xwork2.interceptor">StaticParametersInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/StrutsConversionErrorInterceptor.html" title="class in org.apache.struts2.interceptor">StrutsConversionErrorInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/TokenInterceptor.html" title="class in org.apache.struts2.interceptor">TokenInterceptor</a>, <a href="../../../../org/apache/struts2/interceptor/TokenSessionStoreInterceptor.html" title="class in org.apache.struts2.interceptor">TokenSessionStoreInterceptor</a>, <a href="../../../../com/opensymphony/xwork2/validator/ValidationInterceptor.html" title="class in com.opensymphony.xwork2.validator">ValidationInterceptor</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">Interceptor</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block"><!-- START SNIPPET: introduction --> |
| |
| <p> |
| An interceptor is a stateless class that follows the interceptor pattern, as |
| found in <code>Filter</code> and in AOP languages. |
| </p> |
| |
| <p> |
| Interceptors are objects that dynamically intercept Action invocations. |
| They provide the developer with the opportunity to define code that can be executed |
| before and/or after the execution of an action. They also have the ability |
| to prevent an action from executing. Interceptors provide developers a way to |
| encapsulate common functionality in a re-usable form that can be applied to |
| one or more Actions. |
| </p> |
| |
| <p> |
| Interceptors <b>must</b> be stateless and not assume that a new instance will be created for each request or Action. |
| Interceptors may choose to either short-circuit the <a href="../../../../com/opensymphony/xwork2/ActionInvocation.html" title="interface in com.opensymphony.xwork2"><code>ActionInvocation</code></a> execution and return a return code |
| (such as <a href="../../../../com/opensymphony/xwork2/Action.html#SUCCESS"><code>Action.SUCCESS</code></a>), or it may choose to do some processing before |
| and/or after delegating the rest of the procesing using <a href="../../../../com/opensymphony/xwork2/ActionInvocation.html#invoke--"><code>ActionInvocation.invoke()</code></a>. |
| </p> |
| <!-- END SNIPPET: introduction --> |
| |
| <!-- START SNIPPET: parameterOverriding --> |
| <p> |
| Interceptor's parameter could be overridden through the following ways :- |
| </p> |
| |
| <b>Method 1:</b> |
| <pre> |
| <action name="myAction" class="myActionClass"> |
| <interceptor-ref name="exception"/> |
| <interceptor-ref name="alias"/> |
| <interceptor-ref name="params"/> |
| <interceptor-ref name="servletConfig"/> |
| <interceptor-ref name="prepare"/> |
| <interceptor-ref name="i18n"/> |
| <interceptor-ref name="chain"/> |
| <interceptor-ref name="modelDriven"/> |
| <interceptor-ref name="fileUpload"/> |
| <interceptor-ref name="staticParams"/> |
| <interceptor-ref name="params"/> |
| <interceptor-ref name="conversionError"/> |
| <interceptor-ref name="validation"> |
| <param name="excludeMethods">myValidationExcudeMethod</param> |
| </interceptor-ref> |
| <interceptor-ref name="workflow"> |
| <param name="excludeMethods">myWorkflowExcludeMethod</param> |
| </interceptor-ref> |
| </action> |
| </pre> |
| |
| <b>Method 2:</b> |
| <pre> |
| <action name="myAction" class="myActionClass"> |
| <interceptor-ref name="defaultStack"> |
| <param name="validation.excludeMethods">myValidationExcludeMethod</param> |
| <param name="workflow.excludeMethods">myWorkflowExcludeMethod</param> |
| </interceptor-ref> |
| </action> |
| </pre> |
| |
| <p> |
| In the first method, the whole default stack is copied and the parameter then |
| changed accordingly. |
| </p> |
| |
| <p> |
| In the second method, the 'interceptor-ref' refer to an existing |
| interceptor-stack, namely defaultStack in this example, and override the validator |
| and workflow interceptor excludeMethods typically in this case. Note that in the |
| 'param' tag, the name attribute contains a dot (.) the word before the dot(.) |
| specifies the interceptor name whose parameter is to be overridden and the word after |
| the dot (.) specifies the parameter itself. Essetially it is as follows :- |
| </p> |
| |
| <pre> |
| <interceptor-name>.<parameter-name> |
| </pre> |
| <p> |
| <b>Note</b> also that in this case the 'interceptor-ref' name attribute |
| is used to indicate an interceptor stack which makes sense as if it is referring |
| to the interceptor itself it would be just using Method 1 describe above. |
| </p> |
| <!-- END SNIPPET: parameterOverriding --> |
| |
| <p> |
| <b>Nested Interceptor param overriding</b> |
| </p> |
| |
| <!-- START SNIPPET: nestedParameterOverriding --> |
| <p> |
| Interceptor stack parameter overriding could be nested into as many level as possible, though it would |
| be advisable not to nest it too deep as to avoid confusion, For example, |
| </p> |
| <pre> |
| <interceptor name="interceptor1" class="foo.bar.Interceptor1" /> |
| <interceptor name="interceptor2" class="foo.bar.Interceptor2" /> |
| <interceptor name="interceptor3" class="foo.bar.Interceptor3" /> |
| <interceptor name="interceptor4" class="foo.bar.Interceptor4" /> |
| <interceptor-stack name="stack1"> |
| <interceptor-ref name="interceptor1" /> |
| </interceptor-stack> |
| <interceptor-stack name="stack2"> |
| <interceptor-ref name="intercetor2" /> |
| <interceptor-ref name="stack1" /> |
| </interceptor-stack> |
| <interceptor-stack name="stack3"> |
| <interceptor-ref name="interceptor3" /> |
| <interceptor-ref name="stack2" /> |
| </interceptor-stack> |
| <interceptor-stack name="stack4"> |
| <interceptor-ref name="interceptor4" /> |
| <interceptor-ref name="stack3" /> |
| </interceptor-stack> |
| </pre> |
| |
| <p> |
| Assuming the interceptor has the following properties |
| </p> |
| |
| <table border="1" summary=""> |
| <tr> |
| <td>Interceptor</td> |
| <td>property</td> |
| </tr> |
| <tr> |
| <td>Interceptor1</td> |
| <td>param1</td> |
| </tr> |
| <tr> |
| <td>Interceptor2</td> |
| <td>param2</td> |
| </tr> |
| <tr> |
| <td>Interceptor3</td> |
| <td>param3</td> |
| </tr> |
| <tr> |
| <td>Interceptor4</td> |
| <td>param4</td> |
| </tr> |
| </table> |
| |
| <p> |
| We could override them as follows : |
| </p> |
| |
| <pre> |
| <action ... > |
| <!-- to override parameters of interceptor located directly in the stack --> |
| <interceptor-ref name="stack4"> |
| <param name="interceptor4.param4"> ... </param> |
| </interceptor-ref> |
| </action> |
| |
| <action ... > |
| <!-- to override parameters of interceptor located under nested stack --> |
| <interceptor-ref name="stack4"> |
| <param name="stack3.interceptor3.param3"> ... </param> |
| <param name="stack3.stack2.interceptor2.param2"> ... </param> |
| <param name="stack3.stack2.stack1.interceptor1.param1"> ... </param> |
| </interceptor-ref> |
| </action> |
| </pre> |
| |
| <!-- END SNIPPET: nestedParameterOverriding --></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Jason Carreira, tmjee</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/opensymphony/xwork2/interceptor/Interceptor.html#destroy--">destroy</a></span>()</code> |
| <div class="block">Called to let an interceptor clean up any resources it has allocated.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/opensymphony/xwork2/interceptor/Interceptor.html#init--">init</a></span>()</code> |
| <div class="block">Called after an interceptor is created, but before any requests are processed using |
| <a href="../../../../com/opensymphony/xwork2/interceptor/Interceptor.html#intercept-com.opensymphony.xwork2.ActionInvocation-"><code>intercept</code></a> , giving |
| the Interceptor a chance to initialize any needed resources.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/opensymphony/xwork2/interceptor/Interceptor.html#intercept-com.opensymphony.xwork2.ActionInvocation-">intercept</a></span>(<a href="../../../../com/opensymphony/xwork2/ActionInvocation.html" title="interface in com.opensymphony.xwork2">ActionInvocation</a> invocation)</code> |
| <div class="block">Allows the Interceptor to do some processing on the request before and/or after the rest of the processing of the |
| request by the <a href="../../../../com/opensymphony/xwork2/ActionInvocation.html" title="interface in com.opensymphony.xwork2"><code>ActionInvocation</code></a> or to short-circuit the processing and just return a String return code.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="destroy--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>destroy</h4> |
| <pre>void destroy()</pre> |
| <div class="block">Called to let an interceptor clean up any resources it has allocated.</div> |
| </li> |
| </ul> |
| <a name="init--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>init</h4> |
| <pre>void init()</pre> |
| <div class="block">Called after an interceptor is created, but before any requests are processed using |
| <a href="../../../../com/opensymphony/xwork2/interceptor/Interceptor.html#intercept-com.opensymphony.xwork2.ActionInvocation-"><code>intercept</code></a> , giving |
| the Interceptor a chance to initialize any needed resources.</div> |
| </li> |
| </ul> |
| <a name="intercept-com.opensymphony.xwork2.ActionInvocation-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>intercept</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> intercept(<a href="../../../../com/opensymphony/xwork2/ActionInvocation.html" title="interface in com.opensymphony.xwork2">ActionInvocation</a> invocation) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre> |
| <div class="block">Allows the Interceptor to do some processing on the request before and/or after the rest of the processing of the |
| request by the <a href="../../../../com/opensymphony/xwork2/ActionInvocation.html" title="interface in com.opensymphony.xwork2"><code>ActionInvocation</code></a> or to short-circuit the processing and just return a String return code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>invocation</code> - the action invocation</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the return code, either returned from <a href="../../../../com/opensymphony/xwork2/ActionInvocation.html#invoke--"><code>ActionInvocation.invoke()</code></a>, or from the interceptor itself.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - any system-level error, as defined in <a href="../../../../com/opensymphony/xwork2/Action.html#execute--"><code>Action.execute()</code></a>.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
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