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.impl; 018 019 import org.apache.camel.impl.converter.TypeConverterRegistry; 020 021 /** 022 * A caching proxy so that a single 023 * @version $Revision: 630591 $ 024 */ 025 public class CachingInjector<T> { 026 private final TypeConverterRegistry repository; 027 private final Class<T> type; 028 private T instance; 029 030 public CachingInjector(TypeConverterRegistry repository, Class<T> type) { 031 this.repository = repository; 032 this.type = type; 033 } 034 035 public synchronized T newInstance() { 036 if (instance == null) { 037 instance = createInstance(type); 038 } 039 return instance; 040 } 041 042 protected T createInstance(Class<T> t) { 043 return (T) repository.getInjector().newInstance(t); 044 } 045 }