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.activemq.transport.xstream; 018 019 import java.io.Reader; 020 021 import com.thoughtworks.xstream.XStream; 022 023 import org.apache.activemq.command.Command; 024 import org.apache.activemq.transport.util.TextWireFormat; 025 import org.apache.activemq.wireformat.WireFormat; 026 027 /** 028 * A {@link WireFormat} implementation which uses the <a 029 * href="http://xstream.codehaus.org/>XStream</a> library to marshall commands 030 * onto the wire 031 * 032 * @version $Revision$ 033 */ 034 public class XStreamWireFormat extends TextWireFormat { 035 private XStream xStream; 036 private int version; 037 038 public int getVersion() { 039 return version; 040 } 041 042 public void setVersion(int version) { 043 this.version = version; 044 } 045 046 public WireFormat copy() { 047 return new XStreamWireFormat(); 048 } 049 050 public Object unmarshalText(String text) { 051 return (Command)getXStream().fromXML(text); 052 } 053 054 public Object unmarshalText(Reader reader) { 055 return (Command)getXStream().fromXML(reader); 056 } 057 058 public String marshalText(Object command) { 059 return getXStream().toXML(command); 060 } 061 062 /** 063 * Can this wireformat process packets of this version 064 * 065 * @param version the version number to test 066 * @return true if can accept the version 067 */ 068 public boolean canProcessWireFormatVersion(int version) { 069 return true; 070 } 071 072 /** 073 * @return the current version of this wire format 074 */ 075 public int getCurrentWireFormatVersion() { 076 return 1; 077 } 078 079 // Properties 080 // ------------------------------------------------------------------------- 081 public XStream getXStream() { 082 if (xStream == null) { 083 xStream = createXStream(); 084 } 085 return xStream; 086 } 087 088 public void setXStream(XStream xStream) { 089 this.xStream = xStream; 090 } 091 092 // Implementation methods 093 // ------------------------------------------------------------------------- 094 protected XStream createXStream() { 095 return new XStream(); 096 } 097 098 }