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 there is a body 079 callback.done(true); 080 return true; 081 } 082 083 if (exchange.getException() != null) { 084 // do not convert if an exception has been thrown as if we attempt to convert and it also fails with a new 085 // exception then it will override the existing exception 086 callback.done(true); 087 return true; 088 } 089 090 String originalCharsetName = null; 091 if (charset != null) { 092 originalCharsetName = exchange.getProperty(Exchange.CHARSET_NAME, String.class); 093 // override existing charset with configured charset as that is what the user 094 // have explicit configured and expects to be used 095 exchange.setProperty(Exchange.CHARSET_NAME, charset); 096 } 097 // use mandatory conversion 098 Object value; 099 try { 100 value = old.getMandatoryBody(type); 101 } catch (Throwable e) { 102 exchange.setException(e); 103 callback.done(true); 104 return true; 105 } 106 107 // create a new message container so we do not drag specialized message objects along 108 // but that is only needed if the old message is a specialized message 109 boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class)); 110 111 if (copyNeeded) { 112 Message msg = new DefaultMessage(exchange.getContext()); 113 msg.copyFromWithNewBody(old, value); 114 115 // replace message on exchange 116 ExchangeHelper.replaceMessage(exchange, msg, false); 117 } else { 118 // no copy needed so set replace value directly 119 old.setBody(value); 120 } 121 122 // remove or restore charset when we are done as we should not propagate that, 123 // as that can lead to double converting later on 124 if (charset != null) { 125 if (originalCharsetName != null && !originalCharsetName.isEmpty()) { 126 exchange.setProperty(Exchange.CHARSET_NAME, originalCharsetName); 127 } else { 128 exchange.removeProperty(Exchange.CHARSET_NAME); 129 } 130 } 131 132 callback.done(true); 133 return true; 134 } 135 136 public Class<?> getType() { 137 return type; 138 } 139 140 public String getCharset() { 141 return charset; 142 } 143 144 @Override 145 protected void doStart() throws Exception { 146 // noop 147 } 148 149 @Override 150 protected void doStop() throws Exception { 151 // noop 152 } 153}