001// Copyright 2008, 2009, 2011 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.bindings;
016
017import org.apache.tapestry5.ComponentResources;
018import org.apache.tapestry5.commons.Location;
019
020public class RenderVariableBinding extends AbstractBinding
021{
022    private final String description;
023    private final ComponentResources resources;
024    private final String name;
025
026    public RenderVariableBinding(Location location, String description, ComponentResources resources, String name)
027    {
028        super(location);
029
030        this.description = description;
031        this.resources = resources;
032        this.name = name;
033    }
034
035    @Override
036    public void set(Object value)
037    {
038        resources.storeRenderVariable(name, value);
039    }
040
041    /**
042     * Returns false, render variables are always variable.
043     */
044    @Override
045    public boolean isInvariant()
046    {
047        return false;
048    }
049
050    @Override
051    public String toString()
052    {
053        return String.format("RenderVariable[%s %s]", description, name);
054    }
055
056    public Object get()
057    {
058        return resources.getRenderVariable(name);
059    }
060
061    /**
062     * Always returns Object since we don't (statically) know the type of object.
063     */
064    @Override
065    public Class getBindingType()
066    {
067        return Object.class;
068    }
069}