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.spi.TypeConverterRegistry; 025 import org.apache.camel.util.ObjectHelper; 026 027 /** 028 * A {@link org.apache.camel.TypeConverter} implementation which instantiates an object 029 * so that an instance method can be used as a fallback type converter 030 * 031 * @version $Revision: 747062 $ 032 */ 033 public class InstanceMethodFallbackTypeConverter implements TypeConverter { 034 private final CachingInjector injector; 035 private final Method method; 036 private final boolean useExchange; 037 private final TypeConverterRegistry registry; 038 039 public InstanceMethodFallbackTypeConverter(CachingInjector injector, Method method, TypeConverterRegistry registry) { 040 this.injector = injector; 041 this.method = method; 042 this.useExchange = method.getParameterTypes().length == 4; 043 this.registry = registry; 044 } 045 046 @Override 047 public String toString() { 048 return "InstanceMethodFallbackTypeConverter: " + method; 049 } 050 051 public <T> T convertTo(Class<T> type, Object value) { 052 return convertTo(type, null, value); 053 } 054 055 @SuppressWarnings("unchecked") 056 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) { 057 Object instance = injector.newInstance(); 058 if (instance == null) { 059 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getCanonicalName()); 060 } 061 return useExchange 062 ? (T)ObjectHelper.invokeMethod(method, instance, type, value, exchange, registry) : (T)ObjectHelper 063 .invokeMethod(method, instance, type, value, registry); 064 } 065 }