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 java.lang.reflect.Method;
020
021 import org.apache.camel.RuntimeCamelException;
022 import org.apache.camel.TypeConverter;
023 import org.apache.camel.impl.CachingInjector;
024 import org.apache.camel.util.ObjectHelper;
025
026 /**
027 * A {@link TypeConverter} implementation which instantiates an object
028 * so that an instance method can be used as a type converter
029 *
030 * @version $Revision: 563607 $
031 */
032 public class InstanceMethodTypeConverter implements TypeConverter {
033 private final CachingInjector injector;
034 private final Method method;
035
036 public InstanceMethodTypeConverter(CachingInjector injector, Method method) {
037 this.injector = injector;
038 this.method = method;
039 }
040
041 @Override
042 public String toString() {
043 return "InstanceMethodTypeConverter: " + method;
044 }
045
046 public synchronized <T> T convertTo(Class<T> type, Object value) {
047 Object instance = injector.newInstance();
048 if (instance == null) {
049 throw new RuntimeCamelException("Could not instantiate aninstance of: " + type.getName());
050 }
051 return (T) ObjectHelper.invokeMethod(method, instance, value);
052 }
053 }