001    //  Copyright 2008 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    
015    package org.apache.tapestry5.ioc.internal.util;
016    
017    import java.lang.reflect.Type;
018    
019    /**
020     * Chain of command for InjectionDefaultProvider.
021     */
022    public class DelegatingInjectionResources implements InjectionResources
023    {
024        private final InjectionResources first;
025        private final InjectionResources next;
026    
027        public DelegatingInjectionResources(InjectionResources first,
028                                            InjectionResources next)
029        {
030            this.first = first;
031            this.next = next;
032        }
033    
034        public <T> T findResource(Class<T> type, Type genericType)
035        {
036            T result = first.findResource(type, null);
037    
038            return result != null ? result : next.findResource(type, genericType);
039        }
040    }