commandactionfactoryproxy.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.action.factory;

import webwork.action.Action;
import webwork.action.CommandDriven;
import webwork.action.ActionContext;

/**
 * Executes a "command" within an action specified either as part of the
 * action name or as a parameter value.
 *
 * @author Rickard 謆erg ([e-mail])
 * @version $Revision: 1.11 $
 */
public class CommandActionFactoryProxy
   extends ActionFactoryProxy
{
   // Attributes ----------------------------------------------------

   // Constructors --------------------------------------------------
   public CommandActionFactoryProxy(ActionFactory aFactory)
   {
      super(aFactory);
   }

   // ActionFactory overrides ---------------------------------------
  /**
   * Locates the matching action object from the action factory proxy chain
   * and then executes a command on it if the {@link CommandDriven} interface
   * is implemented.  The command is determined either by using the text
   * after the <code>"!"</code> in the action name or from the value of the
   * first parameter named
   * <code>"command."</code>
   *
   * @param  aName
   * @return action from the next action factory proxy
   * @exception  Exception
   */
   public Action getActionImpl(String aName)
     throws Exception
   {
      // Set command that was used as part of action name
      int idx = aName.lastIndexOf("!");
      if (idx != -1)
      {
         String command = aName.substring(idx+1);
         String actionName = aName.substring(0, idx);
         Action action = getNextFactory().getActionImpl(actionName);
         if (action instanceof CommandDriven)
         {
            ((CommandDriven)action).setCommand(command);
         }

         return action;
      }

      Action action = getNextFactory().getActionImpl(aName);
      if (action instanceof CommandDriven)
      {
         // Set command that was sent in as a parameter
         String[] commandParam = ((String[])ActionContext.getParameters().get("command"));
         if (commandParam != null)
         {
            ((CommandDriven)action).setCommand(commandParam[0]);
         }
      }

      return action;
   }
}