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.processor; 018 019 import java.io.InputStream; 020 021 import org.apache.camel.CamelContext; 022 import org.apache.camel.CamelContextAware; 023 import org.apache.camel.Exchange; 024 import org.apache.camel.Message; 025 import org.apache.camel.Processor; 026 import org.apache.camel.RuntimeCamelException; 027 import org.apache.camel.Traceable; 028 import org.apache.camel.spi.DataFormat; 029 import org.apache.camel.support.ServiceSupport; 030 import org.apache.camel.util.IOHelper; 031 import org.apache.camel.util.ObjectHelper; 032 import org.apache.camel.util.ServiceHelper; 033 034 /** 035 * Unmarshals the body of the incoming message using the given 036 * <a href="http://camel.apache.org/data-format.html">data format</a> 037 * 038 * @version 039 */ 040 public class UnmarshalProcessor extends ServiceSupport implements Processor, Traceable, CamelContextAware { 041 private CamelContext camelContext; 042 private final DataFormat dataFormat; 043 044 public UnmarshalProcessor(DataFormat dataFormat) { 045 this.dataFormat = dataFormat; 046 } 047 048 public void process(Exchange exchange) throws Exception { 049 ObjectHelper.notNull(dataFormat, "dataFormat"); 050 051 InputStream stream = exchange.getIn().getMandatoryBody(InputStream.class); 052 try { 053 // lets setup the out message before we invoke the dataFormat so that it can mutate it if necessary 054 Message out = exchange.getOut(); 055 out.copyFrom(exchange.getIn()); 056 057 Object result = dataFormat.unmarshal(exchange, stream); 058 if (result instanceof Exchange) { 059 if (result != exchange) { 060 // it's not allowed to return another exchange other than the one provided to dataFormat 061 throw new RuntimeCamelException("The returned exchange " + result + " is not the same as " + exchange + " provided to the DataFormat"); 062 } 063 } else if (result instanceof Message) { 064 // the dataformat has probably set headers, attachments, etc. so let's use it as the outbound payload 065 exchange.setOut((Message) result); 066 } else { 067 out.setBody(result); 068 } 069 } catch (Exception e) { 070 // remove OUT message, as an exception occurred 071 exchange.setOut(null); 072 throw e; 073 } finally { 074 IOHelper.close(stream, "input stream"); 075 } 076 } 077 078 public String toString() { 079 return "Unmarshal[" + dataFormat + "]"; 080 } 081 082 public String getTraceLabel() { 083 return "unmarshal[" + dataFormat + "]"; 084 } 085 086 public CamelContext getCamelContext() { 087 return camelContext; 088 } 089 090 public void setCamelContext(CamelContext camelContext) { 091 this.camelContext = camelContext; 092 } 093 094 @Override 095 protected void doStart() throws Exception { 096 // inject CamelContext on data format 097 if (dataFormat instanceof CamelContextAware) { 098 ((CamelContextAware) dataFormat).setCamelContext(camelContext); 099 } 100 ServiceHelper.startService(dataFormat); 101 } 102 103 @Override 104 protected void doStop() throws Exception { 105 ServiceHelper.stopService(dataFormat); 106 } 107 108 }