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    
015    package org.apache.tapestry5.internal.bindings;
016    
017    import org.apache.tapestry5.ComponentResources;
018    import org.apache.tapestry5.ioc.Location;
019    
020    public 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    }