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
015package org.apache.tapestry5.internal.bindings;
016
017import org.apache.tapestry5.commons.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 */
023public 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}