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.TypeConverterAware; 025 import org.apache.camel.spi.TypeConverterRegistry; 026 import org.apache.camel.support.TypeConverterSupport; 027 import org.apache.camel.util.ObjectHelper; 028 029 /** 030 * A {@link TypeConverter} implementation which instantiates an object 031 * so that an instance method can be used as a type converter 032 * 033 * @version 034 */ 035 public class InstanceMethodTypeConverter extends TypeConverterSupport { 036 private final CachingInjector<?> injector; 037 private final Method method; 038 private final boolean useExchange; 039 private final TypeConverterRegistry registry; 040 private final boolean allowNull; 041 042 @Deprecated 043 public InstanceMethodTypeConverter(CachingInjector<?> injector, Method method, TypeConverterRegistry registry) { 044 this(injector, method, registry, false); 045 } 046 047 public InstanceMethodTypeConverter(CachingInjector<?> injector, Method method, TypeConverterRegistry registry, boolean allowNull) { 048 this.injector = injector; 049 this.method = method; 050 this.useExchange = method.getParameterTypes().length == 2; 051 this.registry = registry; 052 this.allowNull = allowNull; 053 } 054 055 @Override 056 public String toString() { 057 return "InstanceMethodTypeConverter: " + method; 058 } 059 060 @Override 061 public boolean allowNull() { 062 return allowNull; 063 } 064 065 @SuppressWarnings("unchecked") 066 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) { 067 Object instance = injector.newInstance(); 068 if (instance == null) { 069 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getCanonicalName()); 070 } 071 // inject parent type converter 072 if (instance instanceof TypeConverterAware) { 073 if (registry instanceof TypeConverter) { 074 TypeConverter parentTypeConverter = (TypeConverter) registry; 075 ((TypeConverterAware) instance).setTypeConverter(parentTypeConverter); 076 } 077 } 078 return useExchange 079 ? (T)ObjectHelper.invokeMethod(method, instance, value, exchange) : (T)ObjectHelper 080 .invokeMethod(method, instance, value); 081 } 082 083 }