/*
* 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.core;
import java.io.IOException;
import java.io.Serializable;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.view.facelets.ComponentHandler;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributeException;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagException;
import javax.faces.view.facelets.TagHandler;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;
import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;
import org.apache.myfaces.view.facelets.util.ReflectionUtil;
@JSFFaceletTag(
name = "f:phaseListener",
bodyContent = "empty",
tagClass="org.apache.myfaces.taglib.core.PhaseListenerTag")
public class PhaseListenerHandler extends TagHandler
{
private final static class LazyPhaseListener implements PhaseListener, Serializable
{
private static final long serialVersionUID = -6496143057319213401L;
private final String type;
private final ValueExpression binding;
public LazyPhaseListener(String type, ValueExpression binding)
{
this.type = type;
this.binding = binding;
}
private PhaseListener getInstance()
{
PhaseListener instance = null;
FacesContext faces = FacesContext.getCurrentInstance();
if (faces == null)
{
return null;
}
if (this.binding != null)
{
instance = (PhaseListener) binding.getValue(faces.getELContext());
}
if (instance == null && type != null)
{
try
{
instance = (PhaseListener) ReflectionUtil.forName(this.type).newInstance();
}
catch (Exception e)
{
throw new AbortProcessingException("Couldn't Lazily instantiate PhaseListener", e);
}
if (this.binding != null)
{
binding.setValue(faces.getELContext(), instance);
}
}
return instance;
}
public void afterPhase(PhaseEvent event)
{
PhaseListener pl = this.getInstance();
if (pl != null)
{
pl.afterPhase(event);
}
}
public void beforePhase(PhaseEvent event)
{
PhaseListener pl = this.getInstance();
if (pl != null)
{
pl.beforePhase(event);
}
}
public PhaseId getPhaseId()
{
PhaseListener pl = this.getInstance();
return (pl != null) ? pl.getPhaseId() : PhaseId.ANY_PHASE;
}
}
private final TagAttribute binding;
private final String listenerType;
public PhaseListenerHandler(TagConfig config)
{
super(config);
TagAttribute type = this.getAttribute("type");
this.binding = this.getAttribute("binding");
if (type != null)
{
if (!type.isLiteral())
{
throw new TagAttributeException(type, "Must be a literal class name of type PhaseListener");
}
else
{
// test it out
try
{
ReflectionUtil.forName(type.getValue());
}
catch (ClassNotFoundException e)
{
throw new TagAttributeException(type, "Couldn't qualify PhaseListener", e);
}
}
this.listenerType = type.getValue();
}
else
{
this.listenerType = null;
}
}
public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,
ELException
{
if (ComponentHandler.isNew(parent))
{
UIViewRoot root = ComponentSupport.getViewRoot(ctx, parent);
if (root == null)
{
throw new TagException(this.tag, "UIViewRoot not available");
}
ValueExpression b = null;
if (this.binding != null)
{
b = this.binding.getValueExpression(ctx, PhaseListener.class);
}
PhaseListener pl = new LazyPhaseListener(this.listenerType, b);
root.addPhaseListener(pl);
}
}
}