/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *   http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.myfaces.view.facelets.tag.jsf;

 import javax.el.MethodExpression;

 import javax.faces.component.ActionSource;

 import javax.faces.component.ActionSource2;

 import javax.faces.event.ActionEvent;

 import javax.faces.event.MethodExpressionActionListener;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.MetaRule;

 import javax.faces.view.facelets.Metadata;

 import javax.faces.view.facelets.MetadataTarget;

 import javax.faces.view.facelets.TagAttribute;

 import org.apache.myfaces.view.facelets.FaceletCompositionContext;

 import org.apache.myfaces.view.facelets.el.LegacyMethodBinding;

 /**

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class ActionSourceRule extends MetaRule

 {

     public final static Class<?>[] ACTION_SIG = new Class[0];

     public final static Class<?>[] ACTION_LISTENER_SIG = new Class<?>[] { ActionEvent.class };

     final static class ActionMapper extends Metadata

     {

         private final TagAttribute attr;

         public ActionMapper(TagAttribute attr)

         {

             this.attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((ActionSource) instance).setAction(new LegacyMethodBinding(

                     this.attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_SIG)));

         }

     }

     final static class ActionMapper2 extends Metadata

     {

         private final TagAttribute _attr;

         public ActionMapper2(TagAttribute attr)

         {

             this._attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             MethodExpression expr = _attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_SIG);

             ((ActionSource2) instance).setActionExpression(expr);

         }

     }

     final static class ActionListenerMapper extends Metadata

     {

         private final TagAttribute attr;

         public ActionListenerMapper(TagAttribute attr)

         {

             this.attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((ActionSource) instance)

                     .setActionListener(new LegacyMethodBinding(this.attr

                             .getMethodExpression(ctx, null,

                                     ActionSourceRule.ACTION_LISTENER_SIG)));

         }

     }

     final static class ActionListenerMapper2 extends Metadata

     {

         private final TagAttribute _attr;

         public ActionListenerMapper2(TagAttribute attr)

         {

             _attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             // From JSF 2.0 it is possible to have actionListener method without ActionEvent parameter. 

             // It seems that MethodExpressionActionListener from API contains support for it but there is one big

             // problem - one-arg constructor will not preserve the current VariableMapper.

             // This is a problem when using facelets and <ui:decorate/> with EL params (see MYFACES-2541 for details).

             // So we must create two MethodExpressions here - both are created from the current 

             // facelets context and thus varibale mapping will work.

             final MethodExpression methodExpressionOneArg

                     = _attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_LISTENER_SIG);

             final MethodExpression methodExpressionZeroArg

                     = _attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_SIG);

             if (FaceletCompositionContext.getCurrentInstance(ctx).isUsingPSSOnThisView())

             {

                 ((ActionSource2) instance).addActionListener(

                         new PartialMethodExpressionActionListener(methodExpressionOneArg, methodExpressionZeroArg));

             }

             else

             {

                 ((ActionSource2) instance).addActionListener(

                         new MethodExpressionActionListener(methodExpressionOneArg, methodExpressionZeroArg));

             }

         }

     }

     public final static ActionSourceRule INSTANCE = new ActionSourceRule();

     public ActionSourceRule()

     {

         super();

     }

     public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta)

     {

         if (meta.isTargetInstanceOf(ActionSource.class))

         {

             if ("action".equals(name))

             {

                 if (meta.isTargetInstanceOf(ActionSource2.class))

                 {

                     return new ActionMapper2(attribute);

                 }

                 else

                 {

                     return new ActionMapper(attribute);

                 }

             }

             if ("actionListener".equals(name))

             {

                 if (meta.isTargetInstanceOf(ActionSource2.class))

                 {

                     return new ActionListenerMapper2(attribute);

                 }

                 else

                 {

                     return new ActionListenerMapper(attribute);

                 }

             }

         }

         return null;

     }

 }