/*
* 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.AbstractFaceletContext;
import org.apache.myfaces.view.facelets.FaceletCompositionContext;
import org.apache.myfaces.view.facelets.el.LegacyMethodBinding;
/**
*
* @author Jacob Hookom
* @version $Id: ActionSourceRule.java,v 1.5 2008/07/13 19:01:46 rlubke Exp $
*/
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;
}
}