/*******************************************************************************
 *
 * Copyright (c) 2010, InfraDNA, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *
 *
 *
 *
 *******************************************************************************/ 

package hudson.util.xstream;

import com.google.common.collect.ImmutableMap;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.converters.collections.MapConverter;
import com.thoughtworks.xstream.converters.reflection.ReflectionProvider;
import com.thoughtworks.xstream.converters.reflection.SerializableConverter;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.mapper.Mapper;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * {@link ConcurrentHashMap} should convert like a map, instead of via
 * serialization.
 *
 * @author Kohsuke Kawaguchi
 */
public class ImmutableMapConverter extends MapConverter {

    private final SerializableConverter sc;

    public ImmutableMapConverter(XStream xs) {
        this(xs.getMapper(), xs.getReflectionProvider());
    }

    public ImmutableMapConverter(Mapper mapper, ReflectionProvider reflectionProvider) {
        super(mapper);
        sc = new SerializableConverter(mapper, reflectionProvider);
    }

    @Override
    public boolean canConvert(Class type) {
        return ImmutableMap.class.isAssignableFrom(type);
    }

    @Override
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        return ImmutableMap.copyOf((Map) super.unmarshal(reader, context));
    }

    @Override
    protected Object createCollection(Class type) {
        return new HashMap();
    }
}