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/*
 * Copyright (C) 2011 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 singleton collections (list and set) to XML, specifying a nested element for the
 * item.
 * 
 * Supports Collections.singleton(Object) and Collections.singletonList(Object).
 * 
 * 
 * @author Jörg Schaible
 * @since 1.4.2
 */
public class SingletonCollectionConverter extends CollectionConverter {

    private static final Class LIST = Collections.singletonList(Boolean.TRUE).getClass();
    private static final Class SET = Collections.singleton(Boolean.TRUE).getClass();

    /**
     * Construct a SingletonCollectionConverter.
     * 
     * @param mapper the mapper
     * @since 1.4.2
     */
    public SingletonCollectionConverter(Mapper mapper) {
        super(mapper);
    }

    public boolean canConvert(Class type) {
        return LIST == type || SET == type;
    }

    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        reader.moveDown();
        Object item = readItem(reader, context, null);
        reader.moveUp();
        return context.getRequiredType() == LIST
            ? (Object)Collections.singletonList(item)
            : (Object)Collections.singleton(item);
    }
}