001// Copyright 2008, 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 015package org.apache.tapestry5.internal.services; 016 017import java.lang.annotation.Annotation; 018 019import org.apache.tapestry5.internal.InternalPropertyConduit; 020import org.apache.tapestry5.ioc.AnnotationProvider; 021import org.apache.tapestry5.ioc.services.TypeCoercer; 022 023/** 024 * A PropertyConduit for a literal value in an expression, such as a number, or "true", "false" or "null". 025 */ 026public class LiteralPropertyConduit extends PropertyConduitDelegate implements InternalPropertyConduit 027{ 028 private final Class propertyType; 029 030 private final AnnotationProvider annotationProvider; 031 032 private final String description; 033 034 private final Object value; 035 036 public LiteralPropertyConduit(TypeCoercer typeCoercer, Class propertyType, AnnotationProvider annotationProvider, 037 String description, Object value) 038 { 039 super(typeCoercer); 040 041 this.propertyType = propertyType; 042 this.annotationProvider = annotationProvider; 043 this.description = description; 044 045 this.value = value; 046 } 047 048 public Object get(Object instance) 049 { 050 return value; 051 } 052 053 public void set(Object instance, Object value) 054 { 055 throw new RuntimeException(ServicesMessages.literalConduitNotUpdateable()); 056 } 057 058 public Class getPropertyType() 059 { 060 return propertyType; 061 } 062 063 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) 064 { 065 return annotationProvider.getAnnotation(annotationClass); 066 } 067 068 public String getPropertyName() 069 { 070 return null; 071 } 072 073 @Override 074 public String toString() 075 { 076 return description; 077 } 078 079}