    001// Copyright 2006, 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.ioc.Location;
    018
    019/**
    020 * Binding type for literal, immutable values. Literal bindings are {@linkplain org.apache.tapestry5.Binding#isInvariant()
    021 * invariant}; any value provided by a LiteralBinding, even if {@linkplain org.apache.tapestry5.ioc.services.TypeCoercer#coerce(Object,
    022 * Class) coerced}, will be cached aggresively by Tapestry cmponent.
    023 * <p/>
    024 * <p>LiteralBindings are often used for literal string values supplied in-line in the component template, but is used
    025 * for many other things as well, any kind of fixed, read-only value.
    026 */
    027public class LiteralBinding extends AbstractBinding
    028{
    029    private final String description;
    030
    031    private final Object value;
    032
    033    public LiteralBinding(Location location, String description, Object value)
    034    {
    035        super(location);
    036        this.description = description;
    037        this.value = value;
    038    }
    039
    040    public Object get()
    041    {
    042        return value;
    043    }
    044
    045    @Override
    046    public String toString()
    047    {
    048        return String.format("LiteralBinding[%s: %s]", description, value);
    049    }
    050}