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.processor; 018 019import org.apache.camel.AsyncCallback; 020import org.apache.camel.AsyncProcessor; 021import org.apache.camel.Exchange; 022import org.apache.camel.Message; 023import org.apache.camel.impl.DefaultMessage; 024import org.apache.camel.support.ServiceSupport; 025import org.apache.camel.util.AsyncProcessorHelper; 026import org.apache.camel.util.ExchangeHelper; 027import org.apache.camel.util.IOHelper; 028import org.apache.camel.util.ObjectHelper; 029 030/** 031 * A processor which converts the payload of the input message to be of the given type 032 * <p/> 033 * If the conversion fails an {@link org.apache.camel.InvalidPayloadException} is thrown. 034 * 035 * @version 036 */ 037public class ConvertBodyProcessor extends ServiceSupport implements AsyncProcessor { 038 private final Class<?> type; 039 private final String charset; 040 041 public ConvertBodyProcessor(Class<?> type) { 042 ObjectHelper.notNull(type, "type", this); 043 this.type = type; 044 this.charset = null; 045 } 046 047 public ConvertBodyProcessor(Class<?> type, String charset) { 048 ObjectHelper.notNull(type, "type", this); 049 this.type = type; 050 this.charset = IOHelper.normalizeCharset(charset); 051 } 052 053 @Override 054 public String toString() { 055 return "convertBodyTo[" + type.getCanonicalName() + "]"; 056 } 057 058 public void process(Exchange exchange) throws Exception { 059 AsyncProcessorHelper.process(this, exchange); 060 } 061 062 @Override 063 public boolean process(Exchange exchange, AsyncCallback callback) { 064 boolean out = exchange.hasOut(); 065 Message old = out ? exchange.getOut() : exchange.getIn(); 066 067 if (old.getBody() == null) { 068 // only convert if the is a body 069 callback.done(true); 070 return true; 071 } 072 073 if (charset != null) { 074 // override existing charset with configured charset as that is what the user 075 // have explicit configured and expects to be used 076 exchange.setProperty(Exchange.CHARSET_NAME, charset); 077 } 078 // use mandatory conversion 079 Object value; 080 try { 081 value = old.getMandatoryBody(type); 082 } catch (Exception e) { 083 exchange.setException(e); 084 callback.done(true); 085 return true; 086 } 087 088 // create a new message container so we do not drag specialized message objects along 089 // but that is only needed if the old message is a specialized message 090 boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class)); 091 092 if (copyNeeded) { 093 Message msg = new DefaultMessage(); 094 msg.copyFrom(old); 095 msg.setBody(value); 096 097 // replace message on exchange 098 ExchangeHelper.replaceMessage(exchange, msg, false); 099 } else { 100 // no copy needed so set replace value directly 101 old.setBody(value); 102 } 103 104 // remove charset when we are done as we should not propagate that, 105 // as that can lead to double converting later on 106 if (charset != null) { 107 exchange.removeProperty(Exchange.CHARSET_NAME); 108 } 109 110 callback.done(true); 111 return true; 112 } 113 114 public Class<?> getType() { 115 return type; 116 } 117 118 @Override 119 protected void doStart() throws Exception { 120 // noop 121 } 122 123 @Override 124 protected void doStop() throws Exception { 125 // noop 126 } 127}