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Apache Struts API Documentation: Class DispatchAction
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org.apache.struts.actions</FONT>
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Class DispatchAction</H2>
<PRE>
java.lang.Object
|
+--<A HREF="../../../../org/apache/struts/action/Action.html">org.apache.struts.action.Action</A>
|
+--<B>org.apache.struts.actions.DispatchAction</B>
</PRE>
<HR>
<DL>
<DT>public abstract class <B>DispatchAction</B><DT>extends <A HREF="../../../../org/apache/struts/action/Action.html">Action</A></DL>
<P>
<p>An abstract <strong>Action</strong> that dispatches to a public
method that is named by the request parameter whose name is specified
by the <code>parameter</code> property of the corresponding
ActionMapping. This Action is useful for developers who prefer to
combine many similar actions into a single Action class, in order to
simplify their application design.</p>
<p>To configure the use of this action in your
<code>struts-config.xml</code> file, create an entry like this:</p>
<code>
&lt;action path="/saveSubscription"
type="org.apache.struts.actions.DispatchAction"
name="subscriptionForm"
scope="request"
input="/subscription.jsp"
parameter="method"/&gt;
</code>
<p>which will use the value of the request parameter named "method"
to pick the appropriate "perform" method, which must have the same
signature (other than method name) of the standard Action.perform()
method. For example, you might have the following three methods in the
same action:</p>
<ul>
<li>public ActionForward delete(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException</li>
<li>public ActionForward insert(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException</li>
<li>public ActionForward update(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException</li>
</ul>
<p>and call one of the methods with a URL like this:</p>
<code>
http://localhost:8080/myapp/saveSubscription.do?method=update
</code>
<p><strong>NOTE</strong> - All of the other mapping characteristics of
this action must be shared by the various handlers. This places some
constraints over what types of handlers may reasonably be packaged into
the same <code>DispatchAction</code> subclass.</p>
<P>
<DL>
<DT><B>Version: </B><DD>$Revision: 1.1 $ $Date$</DD>
<DT><B>Author: </B><DD>Niall Pemberton <niall.pemberton@btInternet.com>, Craig R. McClanahan</DD>
</DL>
<HR>
<P>
<!-- ======== INNER CLASS SUMMARY ======== -->
<!-- =========== FIELD SUMMARY =========== -->
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<CODE>protected &nbsp;java.lang.Class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#clazz">clazz</A></B></CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Class instance of this <code>DispatchAction</code> class.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static&nbsp;<A HREF="../../../../org/apache/struts/util/MessageResources.html">MessageResources</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#messages">messages</A></B></CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The message resources for this package.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;java.util.HashMap</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#methods">methods</A></B></CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The set of Method objects we have introspected for this class,
keyed by method name.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;java.lang.Class[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#types">types</A></B></CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The set of argument type classes for the reflected method call.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="fields_inherited_from_class_org.apache.struts.action.Action"><!-- --></A>
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<TD><B>Fields inherited from class org.apache.struts.action.<A HREF="../../../../org/apache/struts/action/Action.html">Action</A></B></TD>
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<TD><CODE><A HREF="../../../../org/apache/struts/action/Action.html#DATA_SOURCE_KEY">DATA_SOURCE_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#defaultLocale">defaultLocale</A>, <A HREF="../../../../org/apache/struts/action/Action.html#ERROR_KEY">ERROR_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#EXCEPTION_KEY">EXCEPTION_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#FORM_BEANS_KEY">FORM_BEANS_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#FORWARDS_KEY">FORWARDS_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#LOCALE_KEY">LOCALE_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#MAPPING_KEY">MAPPING_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#MAPPINGS_KEY">MAPPINGS_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#MESSAGES_KEY">MESSAGES_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#MULTIPART_KEY">MULTIPART_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#servlet">servlet</A>, <A HREF="../../../../org/apache/struts/action/Action.html#SERVLET_KEY">SERVLET_KEY</A>, <A HREF="../../../../org/apache/struts/action/Action.html#TRANSACTION_TOKEN_KEY">TRANSACTION_TOKEN_KEY</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#DispatchAction()">DispatchAction</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<!-- ========== METHOD SUMMARY =========== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;java.lang.reflect.Method</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#getMethod(java.lang.String)">getMethod</A></B>(java.lang.String&nbsp;name)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Introspect the current class to identify a method of the specified
name that accepts the same parameter types as the <code>perform()</code>
method does.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../org/apache/struts/action/ActionForward.html">ActionForward</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DispatchAction.html#perform(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">perform</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A>&nbsp;mapping,
<A HREF="../../../../org/apache/struts/action/ActionForm.html">ActionForm</A>&nbsp;form,
javax.servlet.http.HttpServletRequest&nbsp;request,
javax.servlet.http.HttpServletResponse&nbsp;response)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Process the specified HTTP request, and create the corresponding HTTP
response (or forward to another web component that will create it).</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.struts.action.Action"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class org.apache.struts.action.<A HREF="../../../../org/apache/struts/action/Action.html">Action</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../org/apache/struts/action/Action.html#generateToken(javax.servlet.http.HttpServletRequest)">generateToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getLocale(javax.servlet.http.HttpServletRequest)">getLocale</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getResources()">getResources</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getServlet()">getServlet</A>, <A HREF="../../../../org/apache/struts/action/Action.html#isCancelled(javax.servlet.http.HttpServletRequest)">isCancelled</A>, <A HREF="../../../../org/apache/struts/action/Action.html#isTokenValid(javax.servlet.http.HttpServletRequest)">isTokenValid</A>, <A HREF="../../../../org/apache/struts/action/Action.html#perform(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.ServletRequest, javax.servlet.ServletResponse)">perform</A>, <A HREF="../../../../org/apache/struts/action/Action.html#perform(org.apache.struts.action.ActionServlet, org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">perform</A>, <A HREF="../../../../org/apache/struts/action/Action.html#perform(org.apache.struts.action.ActionServlet, org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.ServletRequest, javax.servlet.ServletResponse)">perform</A>, <A HREF="../../../../org/apache/struts/action/Action.html#resetToken(javax.servlet.http.HttpServletRequest)">resetToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveErrors(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionErrors)">saveErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveToken(javax.servlet.http.HttpServletRequest)">saveToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#setLocale(javax.servlet.http.HttpServletRequest, java.util.Locale)">setLocale</A>, <A HREF="../../../../org/apache/struts/action/Action.html#setServlet(org.apache.struts.action.ActionServlet)">setServlet</A>, <A HREF="../../../../org/apache/struts/action/Action.html#toHex(byte[])">toHex</A></CODE></TD>
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<TD><CODE><clinit>, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait</CODE></TD>
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<A NAME="clazz"><!-- --></A><H3>
clazz</H3>
<PRE>
protected java.lang.Class <B>clazz</B></PRE>
<DL>
<DD>The Class instance of this <code>DispatchAction</code> class.</DL>
<HR>
<A NAME="messages"><!-- --></A><H3>
messages</H3>
<PRE>
protected static <A HREF="../../../../org/apache/struts/util/MessageResources.html">MessageResources</A> <B>messages</B></PRE>
<DL>
<DD>The message resources for this package.</DL>
<HR>
<A NAME="methods"><!-- --></A><H3>
methods</H3>
<PRE>
protected java.util.HashMap <B>methods</B></PRE>
<DL>
<DD>The set of Method objects we have introspected for this class,
keyed by method name. This collection is populated as different
methods are called, so that introspection needs to occur only
once per method name.</DL>
<HR>
<A NAME="types"><!-- --></A><H3>
types</H3>
<PRE>
protected java.lang.Class[] <B>types</B></PRE>
<DL>
<DD>The set of argument type classes for the reflected method call. These
are the same for all calls, so calculate them only once.</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="DispatchAction()"><!-- --></A><H3>
DispatchAction</H3>
<PRE>
public <B>DispatchAction</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="perform(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)"><!-- --></A><H3>
perform</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/action/ActionForward.html">ActionForward</A> <B>perform</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A>&nbsp;mapping,
<A HREF="../../../../org/apache/struts/action/ActionForm.html">ActionForm</A>&nbsp;form,
javax.servlet.http.HttpServletRequest&nbsp;request,
javax.servlet.http.HttpServletResponse&nbsp;response)
throws java.io.IOException,
javax.servlet.ServletException</PRE>
<DL>
<DD>Process the specified HTTP request, and create the corresponding HTTP
response (or forward to another web component that will create it).
Return an <code>ActionForward</code> instance describing where and how
control should be forwarded, or <code>null</code> if the response has
already been completed.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/struts/action/Action.html#perform(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">perform</A></CODE> in class <CODE><A HREF="../../../../org/apache/struts/action/Action.html">Action</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The ActionMapping used to select this instance<DD><CODE>actionForm</CODE> - The optional ActionForm bean for this request (if any)<DD><CODE>request</CODE> - The HTTP request we are processing<DD><CODE>response</CODE> - The HTTP response we are creating<DT><B>Throws:</B><DD><CODE>java.io.IOException</CODE> - if an input/output error occurs<DD><CODE>javax.servlet.ServletException</CODE> - if a servlet exception occurs</DL>
</DD>
</DL>
<HR>
<A NAME="getMethod(java.lang.String)"><!-- --></A><H3>
getMethod</H3>
<PRE>
protected java.lang.reflect.Method <B>getMethod</B>(java.lang.String&nbsp;name)
throws java.lang.NoSuchMethodException</PRE>
<DL>
<DD>Introspect the current class to identify a method of the specified
name that accepts the same parameter types as the <code>perform()</code>
method does.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - Name of the method to be introspected<DT><B>Throws:</B><DD><CODE>java.lang.NoSuchMethodException</CODE> - if no such method can be found</DL>
</DD>
</DL>
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