java.lang.Object org.apache.struts.action.Action org.apache.struts.actions.DispatchAction org.apache.struts.actions.LookupDispatchAction public abstract class LookupDispatchAction extends DispatchAction
An abstract Action that dispatches to the subclass mapped execute method. This is useful in cases where an HTML form has multiple submit buttons with the same name. The button name is specified by the parameter property of the corresponding ActionMapping. To configure the use of this action in your struts-config.xml file, create an entry like this:
<action path="/test" type="org.example.MyAction" name="MyForm" scope="request" input="/test.jsp" parameter="method"/>
which will use the value of the request parameter named "method" to locate the corresponding key in ApplicationResources. For example, you might have the following ApplicationResources.properties:
button.add=Add Record button.delete=Delete Record
And your JSP would have the following format for submit buttons:
<html:form action="/test"> <html:submit property="method"> <bean:message key="button.add"/> </html:submit> <html:submit property="method"> <bean:message key="button.delete"/> </html:submit> </html:form>
Your subclass must implement both getKeyMethodMap and the methods defined in the map. An example of such implementations are:
protected Map getKeyMethodMap() { Map map = new HashMap(); map.put("button.add", "add"); map.put("button.delete", "delete"); return map; } public ActionForward add(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // do add return mapping.findForward("success"); } public ActionForward delete(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // do delete return mapping.findForward("success"); }
Notes - If duplicate values exist for the keys returned by getKeys, only the first one found will be returned. If no corresponding key is found then an exception will be thrown. You can override the method unspecified to provide a custom handler. If the submit was cancelled (a html:cancel button was pressed), the custom handler cancelled will be used instead.
Field Summaryprotected java.util.MapkeyMethodMap
Resource key to method name lookup.protected java.util.MaplocaleMap
Reverse lookup map from resource value to resource key.
Fields inherited from class org.apache.struts.actions.DispatchActionclazz, log, messages, methods, types
Fields inherited from class org.apache.struts.action.ActiondefaultLocale, servlet
Constructor SummaryLookupDispatchAction()
Method Summary ActionForwardexecute(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web component that will create it).protected abstract java.util.MapgetKeyMethodMap()
Provides the mapping from resource key to method name.protected java.lang.StringgetLookupMapName(javax.servlet.http.HttpServletRequest request, java.lang.String keyName, ActionMapping mapping)
Lookup the method name corresponding to the client request's locale.protected java.lang.StringgetMethodName(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String parameter)
Returns the method name, given a parameter's value.private java.util.MapinitLookupMap(javax.servlet.http.HttpServletRequest request, java.util.Locale userLocale)
This is the first time this Locale is used so build the reverse lookup Map.
Methods inherited from class org.apache.struts.actions.DispatchActioncancelled, dispatchMethod, getMethod, unspecified
Methods inherited from class org.apache.struts.action.ActionaddErrors, addMessages, execute, generateToken, getDataSource, getDataSource, getErrors, getLocale, getMessages, getResources, getResources, getServlet, isCancelled, isTokenValid, isTokenValid, resetToken, saveErrors, saveErrors, saveMessages, saveMessages, saveToken, setLocale, setServlet
Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Field Detail localeMap
protected java.util.Map localeMap Reverse lookup map from resource value to resource key.
keyMethodMap
protected java.util.Map keyMethodMap Resource key to method name lookup.
Constructor Detail LookupDispatchAction
public LookupDispatchAction() Method Detail execute
public ActionForward execute(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws java.lang.Exception Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web component that will create it). Return an ActionForward instance describing where and how control should be forwarded, or null if the response has already been completed.
Overrides:execute in class DispatchAction Parameters:mapping - The ActionMapping used to select this instancerequest - The HTTP request we are processingresponse - The HTTP response we are creatingform - The optional ActionForm bean for this request (if any) Returns:Describes where and how control should be forwarded. Throws: java.lang.Exception - if an error occurs initLookupMap
private java.util.Map initLookupMap(javax.servlet.http.HttpServletRequest request, java.util.Locale userLocale) This is the first time this Locale is used so build the reverse lookup Map. Search for message keys in all configured MessageResources for the current module.
getKeyMethodMap
protected abstract java.util.Map getKeyMethodMap() Provides the mapping from resource key to method name.
Returns:Resource key / method name map. getLookupMapName
protected java.lang.String getLookupMapName(javax.servlet.http.HttpServletRequest request, java.lang.String keyName, ActionMapping mapping) throws javax.servlet.ServletException Lookup the method name corresponding to the client request's locale.
Parameters:request - The HTTP request we are processingkeyName - The parameter name to use as the properties keymapping - The ActionMapping used to select this instance Returns:The method's localized name. Throws: javax.servlet.ServletException - if keyName cannot be resolvedSince: Struts 1.2.0 getMethodName
protected java.lang.String getMethodName(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String parameter) throws java.lang.Exception Returns the method name, given a parameter's value.
Overrides:getMethodName in class DispatchAction Parameters:mapping - The ActionMapping used to select this instanceform - The optional ActionForm bean for this request (if any)request - The HTTP request we are processingresponse - The HTTP response we are creatingparameter - The ActionMapping parameter's name Returns:The method's name. Throws: java.lang.ExceptionSince: Struts 1.2.0 Overview Package Class Use Tree Deprecated Index Help PREV CLASS NEXT CLASSFRAMES NO FRAMES All Classes All Classes SUMMARY: NESTED | FIELD | CONSTR | METHODDETAIL: FIELD | CONSTR | METHOD Copyright © 2000-2004 - The Apache Software Foundation
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