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.Exchange;
022 import org.apache.camel.RuntimeCamelException;
023 import org.apache.camel.TypeConverter;
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: 747062 $
031 */
032 public class InstanceMethodTypeConverter implements TypeConverter {
033 private final CachingInjector injector;
034 private final Method method;
035 private final boolean useExchange;
036
037 public InstanceMethodTypeConverter(CachingInjector injector, Method method) {
038 this.injector = injector;
039 this.method = method;
040 this.useExchange = method.getParameterTypes().length == 2;
041 }
042
043 @Override
044 public String toString() {
045 return "InstanceMethodTypeConverter: " + method;
046 }
047
048 public <T> T convertTo(Class<T> type, Object value) {
049 return convertTo(type, null, value);
050 }
051
052 @SuppressWarnings("unchecked")
053 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
054 Object instance = injector.newInstance();
055 if (instance == null) {
056 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getCanonicalName());
057 }
058 return useExchange
059 ? (T)ObjectHelper.invokeMethod(method, instance, value, exchange) : (T)ObjectHelper
060 .invokeMethod(method, instance, value);
061 }
062 }