    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}