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org.apache.struts.actions
Class LookupDispatchActionjava.lang.Object
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 Summary
protected java.util.Map
Resource key to method name lookup.
protected java.util.Map
Reverse lookup map from resource value to resource key.
Fields inherited from class org.apache.struts.actions.DispatchAction
clazz, log, messages, methods, types
Fields inherited from class org.apache.struts.action.Action
Constructor Summary
Method Summary
execute(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.Map
Provides the mapping from resource key to method name.
protected java.lang.String
getLookupMapName(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.String
getMethodName(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.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.
Methods inherited from class org.apache.struts.actions.DispatchAction
cancelled, dispatchMethod, getMethod, unspecified
Methods inherited from class org.apache.struts.action.Action
addErrors, 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.Object
clone, 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
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