/*
* Copyright (C) 2004, 2005, 2006 Joe Walnes.
* Copyright (C) 2006, 2007, 2008, 2009 XStream Committers.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
* Created on 15. March 2004 by Joe Walnes
*/
package com.thoughtworks.xstream.core;
import com.thoughtworks.xstream.converters.ConverterLookup;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.path.Path;
import com.thoughtworks.xstream.mapper.Mapper;
public class ReferenceByIdMarshaller extends AbstractReferenceMarshaller {
private final IDGenerator idGenerator;
public static interface IDGenerator {
String next(Object item);
}
public ReferenceByIdMarshaller(HierarchicalStreamWriter writer,
ConverterLookup converterLookup,
Mapper mapper,
IDGenerator idGenerator) {
super(writer, converterLookup, mapper);
this.idGenerator = idGenerator;
}
public ReferenceByIdMarshaller(HierarchicalStreamWriter writer,
ConverterLookup converterLookup,
Mapper mapper) {
this(writer, converterLookup, mapper, new SequenceGenerator(1));
}
protected String createReference(Path currentPath, Object existingReferenceKey) {
return existingReferenceKey.toString();
}
protected Object createReferenceKey(Path currentPath, Object item) {
return idGenerator.next(item);
}
protected void fireValidReference(Object referenceKey) {
String attributeName = getMapper().aliasForSystemAttribute("id");
if (attributeName != null) {
writer.addAttribute(attributeName, referenceKey.toString());
}
}
}