/*
* Copyright (C) 2011, 2018 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 11. October 2011 by Joerg Schaible
*/
package com.thoughtworks.xstream.converters.collections;
import java.util.Collections;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.mapper.Mapper;
/**
* Converts a singleton map to XML, specifying an 'entry'
* element with 'key' and 'value' children.
* <p>Note: 'key' and 'value' is not the name of the generated tag. The
* children are serialized as normal elements and the implementation expects
* them in the order 'key'/'value'.</p>
* <p>Supports Collections.singletonMap.</p>
*
* @author Jörg Schaible
* @since 1.4.2
*/
public class SingletonMapConverter extends MapConverter {
private static final Class MAP = Collections.singletonMap(Boolean.TRUE, null).getClass();
/**
* Construct a SingletonMapConverter.
* @param mapper
* @since 1.4.2
*/
public SingletonMapConverter(Mapper mapper) {
super(mapper);
}
public boolean canConvert(Class type) {
return MAP == type;
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
reader.moveDown();
final Object key = readCompleteItem(reader, context, null);
final Object value = readCompleteItem(reader, context, null);
reader.moveUp();
return Collections.singletonMap(key, value);
}
}