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}