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.converter;
018
019 import org.apache.camel.spi.TypeConverterRegistry;
020
021 /**
022 * A caching proxy
023 *
024 * @version $Revision: 713950 $
025 */
026 public class CachingInjector<T> {
027 private final TypeConverterRegistry repository;
028 private final Class<T> type;
029 private T instance;
030
031 public CachingInjector(TypeConverterRegistry repository, Class<T> type) {
032 this.repository = repository;
033 this.type = type;
034 }
035
036 public synchronized T newInstance() {
037 if (instance == null) {
038 instance = createInstance(type);
039 }
040 return instance;
041 }
042
043 protected T createInstance(Class<T> t) {
044 return repository.getInjector().newInstance(t);
045 }
046 }