    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;
    018import java.lang.reflect.Type;
    019
    020import org.apache.tapestry5.internal.InternalPropertyConduit;
    021import org.apache.tapestry5.ioc.AnnotationProvider;
    022import org.apache.tapestry5.ioc.services.TypeCoercer;
    023
    024/**
    025 * A PropertyConduit for a literal value in an expression, such as a number, or "true", "false" or "null".
    026 */
    027public class LiteralPropertyConduit extends PropertyConduitDelegate implements InternalPropertyConduit
    028{
    029    private final Class propertyType;
    030
    031    private final AnnotationProvider annotationProvider;
    032
    033    private final String description;
    034
    035    private final Object value;
    036
    037    public LiteralPropertyConduit(TypeCoercer typeCoercer, Class propertyType, AnnotationProvider annotationProvider,
    038            String description, Object value)
    039    {
    040        super(typeCoercer);
    041
    042        this.propertyType = propertyType;
    043        this.annotationProvider = annotationProvider;
    044        this.description = description;
    045
    046        this.value = value;
    047    }
    048
    049    public Object get(Object instance)
    050    {
    051        return value;
    052    }
    053
    054    public void set(Object instance, Object value)
    055    {
    056        throw new RuntimeException("Literal values are not updateable.");
    057    }
    058
    059    public Class getPropertyType()
    060    {
    061        return propertyType;
    062    }
    063
    064    public Type getPropertyGenericType()
    065    {
    066        return propertyType;
    067    }
    068
    069    public <T extends Annotation> T getAnnotation(Class<T> annotationClass)
    070    {
    071        return annotationProvider.getAnnotation(annotationClass);
    072    }
    073
    074    public String getPropertyName()
    075    {
    076        return null;
    077    }
    078
    079    @Override
    080    public String toString()
    081    {
    082        return description;
    083    }
    084
    085}