001    //  Copyright 2008, 2009 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.ioc.Location;
018    
019    /**
020     * Extends {@link org.apache.tapestry5.internal.bindings.AbstractBinding} with a description and a binding type, with
021     * invariant forced to true.
022     */
023    public abstract class InvariantBinding extends AbstractBinding
024    {
025        private final Class bindingType;
026    
027        protected final String description;
028    
029        public InvariantBinding(Location location, Class bindingType, String description)
030        {
031            super(location);
032    
033            this.bindingType = bindingType;
034            this.description = description;
035        }
036    
037        /**
038         * Returns true.
039         */
040        @Override
041        public boolean isInvariant()
042        {
043            return true;
044        }
045    
046        @Override
047        public Class getBindingType()
048        {
049            return bindingType;
050        }
051    
052        @Override
053        public String toString()
054        {
055            return String.format("InvariantBinding[%s]", description);
056        }
057    }