    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    }