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The private implementation classes of the Apache MyFaces Core JSF-2.3-next Implementation
/*
* 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.composite;
import java.beans.BeanDescriptor;
import java.beans.BeanInfo;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletHandler;
import org.apache.myfaces.view.facelets.AbstractFaceletContext;
import org.apache.myfaces.view.facelets.FaceletCompositionContext;
import org.apache.myfaces.view.facelets.el.CompositeComponentELUtils;
import org.apache.myfaces.view.facelets.tag.TagHandlerUtils;
/**
* This handler wraps a composite component definition.
*
* This handler is set by facelets compiler through
* CompositeComponentUnit class by the presence of cc:interface
* or cc:implementation tag.
*
*
* The presence of this class has the following objectives:
*
*
* - Cache the BeanInfo instance for a composite component
* - Set a Location object to resolve #{cc} correctly
* - Push the current composite component on FaceletCompositionContext stack
* - Set the attributes with declared default values
*
* @author Leonardo Uribe (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public final class CompositeComponentDefinitionTagHandler implements FaceletHandler
{
private final FaceletHandler _nextHandler;
private boolean _cacheable;
/**
* Cached instance used by this component. Note here we have a
* "racy single-check".If this field is used, it is supposed
* the object cached by this handler is immutable, and this is
* granted if all properties not saved as ValueExpression are
* "literal".
**/
private BeanInfo _cachedBeanInfo;
private InterfaceHandler _interfaceHandler;
private ImplementationHandler _implementationHandler;
public CompositeComponentDefinitionTagHandler(FaceletHandler next)
{
this._nextHandler = next;
_cacheable = true;
_interfaceHandler = TagHandlerUtils.findFirstNextByType(_nextHandler, InterfaceHandler.class);
_implementationHandler = TagHandlerUtils.findFirstNextByType(_nextHandler, ImplementationHandler.class);
Collection metadataInterfaceHandlerList =
TagHandlerUtils.findNextByType( _nextHandler, InterfaceDescriptorCreator.class);
for (InterfaceDescriptorCreator handler : metadataInterfaceHandlerList)
{
if (!handler.isCacheable())
{
_cacheable = false;
break;
}
}
if (!_cacheable)
{
for (InterfaceDescriptorCreator handler : metadataInterfaceHandlerList)
{
handler.setCacheable(false);
}
}
}
@Override
public void apply(FaceletContext ctx, UIComponent parent) throws IOException
{
FaceletCompositionContext mctx = FaceletCompositionContext.getCurrentInstance(ctx);
AbstractFaceletContext actx = (AbstractFaceletContext)ctx;
UIComponent compositeBaseParent = actx.isBuildingCompositeComponentMetadata() ? parent : parent.getParent();
// Store the current Location on the parent (the location is needed
// to resolve the related composite component via #{cc} properly).
if (_interfaceHandler != null)
{
if (!compositeBaseParent.getAttributes().containsKey(CompositeComponentELUtils.LOCATION_KEY))
{
compositeBaseParent.getAttributes()
.put(CompositeComponentELUtils.LOCATION_KEY, this._interfaceHandler.getLocation());
}
}
else if (_implementationHandler != null)
{
if (!compositeBaseParent.getAttributes().containsKey(CompositeComponentELUtils.LOCATION_KEY))
{
compositeBaseParent.getAttributes()
.put(CompositeComponentELUtils.LOCATION_KEY, this._implementationHandler.getLocation());
}
}
// Only apply if we are building composite component metadata,
// in other words we are calling ViewDeclarationLanguage.getComponentMetadata
if ( actx.isBuildingCompositeComponentMetadata() )
{
CompositeComponentBeanInfo tempBeanInfo =
(CompositeComponentBeanInfo) compositeBaseParent.getAttributes()
.get(UIComponent.BEANINFO_KEY);
if (tempBeanInfo == null)
{
if (_cacheable)
{
if (_cachedBeanInfo == null)
{
tempBeanInfo = _createCompositeComponentMetadata(compositeBaseParent);
compositeBaseParent.getAttributes().put(UIComponent.BEANINFO_KEY, tempBeanInfo);
try
{
mctx.pushCompositeComponentToStack(compositeBaseParent);
// Store the ccLevel key here
if (!compositeBaseParent.getAttributes().containsKey(CompositeComponentELUtils.LEVEL_KEY))
{
compositeBaseParent.getAttributes()
.put(CompositeComponentELUtils.LEVEL_KEY, mctx.getCompositeComponentLevel());
}
_nextHandler.apply(ctx, parent);
Collection declaredDefaultValues = null;
for (PropertyDescriptor pd : tempBeanInfo.getPropertyDescriptors())
{
if (pd.getValue("default") != null)
{
if (declaredDefaultValues == null)
{
declaredDefaultValues = new ArrayList();
}
declaredDefaultValues.add(pd.getName());
}
}
if (declaredDefaultValues == null)
{
declaredDefaultValues = Collections.emptyList();
}
tempBeanInfo.getBeanDescriptor().
setValue(UIComponent.ATTRS_WITH_DECLARED_DEFAULT_VALUES, declaredDefaultValues);
}
finally
{
mctx.popCompositeComponentToStack();
_cachedBeanInfo = tempBeanInfo;
}
}
else
{
// Put the cached instance, but in that case it is not necessary to call
// nextHandler
compositeBaseParent.getAttributes().put(UIComponent.BEANINFO_KEY, _cachedBeanInfo);
}
}
else
{
tempBeanInfo = _createCompositeComponentMetadata(compositeBaseParent);
compositeBaseParent.getAttributes().put(UIComponent.BEANINFO_KEY, tempBeanInfo);
try
{
mctx.pushCompositeComponentToStack(compositeBaseParent);
// Store the ccLevel key here
if (!compositeBaseParent.getAttributes().containsKey(CompositeComponentELUtils.LEVEL_KEY))
{
compositeBaseParent.getAttributes()
.put(CompositeComponentELUtils.LEVEL_KEY, mctx.getCompositeComponentLevel());
}
_nextHandler.apply(ctx, parent);
Collection declaredDefaultValues = null;
for (PropertyDescriptor pd : tempBeanInfo.getPropertyDescriptors())
{
if (pd.getValue("default") != null)
{
if (declaredDefaultValues == null)
{
declaredDefaultValues = new ArrayList();
}
declaredDefaultValues.add(pd.getName());
}
}
if (declaredDefaultValues == null)
{
declaredDefaultValues = Collections.emptyList();
}
tempBeanInfo.getBeanDescriptor().
setValue(UIComponent.ATTRS_WITH_DECLARED_DEFAULT_VALUES, declaredDefaultValues);
}
finally
{
mctx.popCompositeComponentToStack();
}
}
}
}
else
{
try
{
mctx.pushCompositeComponentToStack(compositeBaseParent);
// Store the ccLevel key here
if (!compositeBaseParent.getAttributes().containsKey(CompositeComponentELUtils.LEVEL_KEY))
{
compositeBaseParent.getAttributes()
.put(CompositeComponentELUtils.LEVEL_KEY, mctx.getCompositeComponentLevel());
}
_nextHandler.apply(ctx, parent);
}
finally
{
mctx.popCompositeComponentToStack();
}
}
}
private CompositeComponentBeanInfo _createCompositeComponentMetadata(UIComponent parent)
{
BeanDescriptor descriptor = new BeanDescriptor(parent.getClass());
CompositeComponentBeanInfo beanInfo = new CompositeComponentBeanInfo(descriptor);
return beanInfo;
}
}