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: 563607 $
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 }