/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.transport.xstream;
import java.io.IOException;
import java.io.Reader;
import org.apache.activemq.command.MarshallAware;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.transport.util.TextWireFormat;
import org.apache.activemq.wireformat.WireFormat;
import com.thoughtworks.xstream.XStream;
/**
* A {@link WireFormat} implementation which uses the <a
* href="http://xstream.codehaus.org/>XStream</a> library to marshall commands
* onto the wire
*
*
*/
public class XStreamWireFormat extends TextWireFormat {
private XStream xStream;
private int version;
@Override
public int getVersion() {
return version;
}
@Override
public void setVersion(int version) {
this.version = version;
}
public WireFormat copy() {
return new XStreamWireFormat();
}
@Override
public Object unmarshalText(String text) {
return getXStream().fromXML(text);
}
@Override
public Object unmarshalText(Reader reader) {
return getXStream().fromXML(reader);
}
@Override
public String marshalText(Object command) throws IOException {
if (command instanceof MarshallAware) {
((MarshallAware)command).beforeMarshall(this);
} else if(command instanceof MessageDispatch) {
MessageDispatch dispatch = (MessageDispatch) command;
if (dispatch != null && dispatch.getMessage() != null) {
dispatch.getMessage().beforeMarshall(this);
}
}
return getXStream().toXML(command);
}
/**
* Can this wireformat process packets of this version
*
* @param version the version number to test
* @return true if can accept the version
*/
public boolean canProcessWireFormatVersion(int version) {
return true;
}
/**
* @return the current version of this wire format
*/
public int getCurrentWireFormatVersion() {
return 1;
}
// Properties
// -------------------------------------------------------------------------
public XStream getXStream() {
if (xStream == null) {
xStream = createXStream();
// make it work in OSGi env
xStream.setClassLoader(getClass().getClassLoader());
}
return xStream;
}
public void setXStream(XStream xStream) {
this.xStream = xStream;
}
// Implementation methods
// -------------------------------------------------------------------------
protected XStream createXStream() {
XStream xstream = new XStream();
xstream.ignoreUnknownElements();
return xstream;
}
}