001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.util;
018    
019    import org.apache.camel.IsSingleton;
020    import org.apache.camel.spi.Injector;
021    
022    /**
023     * A simple implementation of {@link Injector} which just uses reflection to
024     * instantiate new objects using their zero argument constructor. For more
025     * complex implementations try the Spring or Guice implementations.
026     * 
027     * @version 
028     */
029    public class ReflectionInjector implements Injector {
030    
031        public <T> T newInstance(Class<T> type) {
032            return ObjectHelper.newInstance(type);
033        }
034    
035        public <T> T newInstance(Class<T> type, Object instance) {
036            if (instance instanceof IsSingleton) {
037                boolean singleton = ((IsSingleton) instance).isSingleton();
038                if (singleton) {
039                    return type.cast(instance);
040                }
041            }
042            return newInstance(type);
043        }
044    }