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: 1092 $ 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 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) { 053 Object instance = injector.newInstance(); 054 if (instance == null) { 055 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getName()); 056 } 057 return useExchange 058 ? (T)ObjectHelper.invokeMethod(method, instance, value, exchange) : (T)ObjectHelper 059 .invokeMethod(method, instance, value); 060 } 061 }