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.spi.IdAware; 025import org.apache.camel.support.ServiceSupport; 026import org.apache.camel.util.AsyncProcessorHelper; 027import org.apache.camel.util.ExchangeHelper; 028import org.apache.camel.util.IOHelper; 029import org.apache.camel.util.ObjectHelper; 030 031/** 032 * A processor which converts the payload of the input message to be of the given type 033 * <p/> 034 * If the conversion fails an {@link org.apache.camel.InvalidPayloadException} is thrown. 035 * 036 * @version 037 */ 038public class ConvertBodyProcessor extends ServiceSupport implements AsyncProcessor, IdAware { 039 private String id; 040 private final Class<?> type; 041 private final String charset; 042 043 public ConvertBodyProcessor(Class<?> type) { 044 ObjectHelper.notNull(type, "type", this); 045 this.type = type; 046 this.charset = null; 047 } 048 049 public ConvertBodyProcessor(Class<?> type, String charset) { 050 ObjectHelper.notNull(type, "type", this); 051 this.type = type; 052 this.charset = IOHelper.normalizeCharset(charset); 053 } 054 055 @Override 056 public String toString() { 057 return "convertBodyTo[" + type.getCanonicalName() + "]"; 058 } 059 060 public String getId() { 061 return id; 062 } 063 064 public void setId(String id) { 065 this.id = id; 066 } 067 068 public void process(Exchange exchange) throws Exception { 069 AsyncProcessorHelper.process(this, exchange); 070 } 071 072 @Override 073 public boolean process(Exchange exchange, AsyncCallback callback) { 074 boolean out = exchange.hasOut(); 075 Message old = out ? exchange.getOut() : exchange.getIn(); 076 077 if (old.getBody() == null) { 078 // only convert if the is a body 079 callback.done(true); 080 return true; 081 } 082 083 if (charset != null) { 084 // override existing charset with configured charset as that is what the user 085 // have explicit configured and expects to be used 086 exchange.setProperty(Exchange.CHARSET_NAME, charset); 087 } 088 // use mandatory conversion 089 Object value; 090 try { 091 value = old.getMandatoryBody(type); 092 } catch (Throwable e) { 093 exchange.setException(e); 094 callback.done(true); 095 return true; 096 } 097 098 // create a new message container so we do not drag specialized message objects along 099 // but that is only needed if the old message is a specialized message 100 boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class)); 101 102 if (copyNeeded) { 103 Message msg = new DefaultMessage(); 104 msg.copyFrom(old); 105 msg.setBody(value); 106 107 // replace message on exchange 108 ExchangeHelper.replaceMessage(exchange, msg, false); 109 } else { 110 // no copy needed so set replace value directly 111 old.setBody(value); 112 } 113 114 // remove charset when we are done as we should not propagate that, 115 // as that can lead to double converting later on 116 if (charset != null) { 117 exchange.removeProperty(Exchange.CHARSET_NAME); 118 } 119 120 callback.done(true); 121 return true; 122 } 123 124 public Class<?> getType() { 125 return type; 126 } 127 128 public String getCharset() { 129 return charset; 130 } 131 132 @Override 133 protected void doStart() throws Exception { 134 // noop 135 } 136 137 @Override 138 protected void doStop() throws Exception { 139 // noop 140 } 141}