001// Copyright 2004, 2005 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.tapestry.binding; 016 017import org.apache.hivemind.ApplicationRuntimeException; 018import org.apache.hivemind.Location; 019import org.apache.hivemind.util.Defense; 020import org.apache.tapestry.IComponent; 021import org.apache.tapestry.coerce.ValueConverter; 022 023/** 024 * A binding where the path is the id of a child component. 025 * 026 * @author Howard M. Lewis Ship 027 * @since 4.0 028 */ 029public class ComponentBinding extends AbstractBinding 030{ 031 private final IComponent _component; 032 033 private final String _componentId; 034 035 public ComponentBinding(String description, ValueConverter valueConverter, Location location, 036 IComponent component, String componentId) 037 { 038 super(description, valueConverter, location); 039 040 Defense.notNull(component, "component"); 041 Defense.notNull(componentId, "componentId"); 042 043 _component = component; 044 _componentId = componentId; 045 } 046 047 public Object getObject() 048 { 049 try 050 { 051 return _component.getComponent(_componentId); 052 } 053 catch (Exception ex) 054 { 055 throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex); 056 } 057 } 058 059 public Object getComponent() 060 { 061 return _component; 062 } 063 064}