    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    }