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 */ 017package org.apache.camel.impl.converter; 018 019import java.lang.reflect.Method; 020 021import org.apache.camel.Exchange; 022import org.apache.camel.RuntimeCamelException; 023import org.apache.camel.spi.TypeConverterRegistry; 024import org.apache.camel.support.TypeConverterSupport; 025import 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 032 */ 033public class InstanceMethodFallbackTypeConverter extends TypeConverterSupport { 034 private final CachingInjector<?> injector; 035 private final Method method; 036 private final boolean useExchange; 037 private final TypeConverterRegistry registry; 038 private final boolean allowNull; 039 040 @Deprecated 041 public InstanceMethodFallbackTypeConverter(CachingInjector<?> injector, Method method, TypeConverterRegistry registry) { 042 this(injector, method, registry, false); 043 } 044 045 public InstanceMethodFallbackTypeConverter(CachingInjector<?> injector, Method method, TypeConverterRegistry registry, boolean allowNull) { 046 this.injector = injector; 047 this.method = method; 048 this.useExchange = method.getParameterCount() == 4; 049 this.registry = registry; 050 this.allowNull = allowNull; 051 } 052 053 @Override 054 public String toString() { 055 return "InstanceMethodFallbackTypeConverter: " + method; 056 } 057 058 @Override 059 public boolean allowNull() { 060 return allowNull; 061 } 062 063 @SuppressWarnings("unchecked") 064 public <T> T convertTo(Class<T> type, Exchange exchange, Object value) { 065 Object instance = injector.newInstance(); 066 if (instance == null) { 067 throw new RuntimeCamelException("Could not instantiate an instance of: " + type.getCanonicalName()); 068 } 069 return useExchange 070 ? (T)ObjectHelper.invokeMethod(method, instance, type, exchange, value, registry) : (T)ObjectHelper 071 .invokeMethod(method, instance, type, value, registry); 072 } 073 074}