org.apache.myfaces.view.facelets.el.LocationValueExpression Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of myfaces-impl Show documentation
Show all versions of myfaces-impl Show documentation
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.el;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.el.ValueReference;
import javax.faces.FacesWrapper;
import javax.faces.context.FacesContext;
import javax.faces.view.Location;
/**
* A ValueExpression that contains the original ValueExpression and
* the Location of the facelet file from which the ValueExpression was
* created. This is needed when the current composite component (cc)
* has to be resolved by the ValueExpression, because #{cc} refers to the
* composite component which is implemented in the file the ValueExpression
* comes from and not the one currently on top of the composite component stack.
*
* This ValueExpression implementation passes through all methods to the delegate
* ValueExpression, but saves the related composite component in a FacesContext attribute
* before the invocation of the method on the delegate and removes it afterwards.
*
* @author Jakob Korherr (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class LocationValueExpression extends ValueExpression
implements FacesWrapper, Externalizable
{
private static final long serialVersionUID = -5636849184764526288L;
// location and delegate need to be available in LocationValueExpressionUEL
Location location;
ValueExpression delegate;
int ccLevel;
public LocationValueExpression()
{
super();
}
public LocationValueExpression(Location location, ValueExpression delegate)
{
this.location = location;
this.delegate = delegate;
this.ccLevel = 0;
}
public LocationValueExpression(Location location, ValueExpression delegate, int ccLevel)
{
this.location = location;
this.delegate = delegate;
this.ccLevel = ccLevel;
}
public Location getLocation()
{
return location;
}
public int getCCLevel()
{
return ccLevel;
}
public LocationValueExpression apply(int newCCLevel)
{
if(this.ccLevel == newCCLevel)
{
return this;
}
else
{
return new LocationValueExpression(this.location, this.delegate, newCCLevel);
}
}
public LocationValueExpression apply(int newCCLevel, Location newLocation)
{
if(this.ccLevel == newCCLevel && this.location.getPath().equals(newLocation.getPath()))
{
return this;
}
else
{
return new LocationValueExpression(newLocation, this.delegate, newCCLevel);
}
}
@Override
public Class getExpectedType()
{
return delegate.getExpectedType();
}
@Override
public Class getType(ELContext context)
{
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
try
{
return delegate.getType(context);
}
finally
{
CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
}
}
@Override
public Object getValue(ELContext context)
{
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
try
{
return delegate.getValue(context);
}
finally
{
CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
}
}
@Override
public boolean isReadOnly(ELContext context)
{
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
try
{
return delegate.isReadOnly(context);
}
finally
{
CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
}
}
@Override
public void setValue(ELContext context, Object value)
{
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
try
{
delegate.setValue(context, value);
}
finally
{
CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
}
}
@Override
public boolean equals(Object obj)
{
return delegate.equals(obj);
}
@Override
public String getExpressionString()
{
return delegate.getExpressionString();
}
@Override
public int hashCode()
{
return delegate.hashCode();
}
@Override
public boolean isLiteralText()
{
return delegate.isLiteralText();
}
@Override
public ValueExpression getWrapped()
{
return delegate;
}
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
{
this.delegate = (ValueExpression) in.readObject();
this.location = (Location) in.readObject();
this.ccLevel = in.readInt();
}
@Override
public void writeExternal(ObjectOutput out) throws IOException
{
out.writeObject(this.delegate);
out.writeObject(this.location);
out.writeInt(this.ccLevel);
}
@Override
public ValueReference getValueReference(ELContext context)
{
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
try
{
return delegate.getValueReference(context);
}
finally
{
CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
}
}
}