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// Burton Computer Corporation
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package org.javimmutable.collections.setmap;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.JImmutableSetMap;
import org.javimmutable.collections.hash.JImmutableHashMap;
import org.javimmutable.collections.hash.JImmutableHashSet;
import org.javimmutable.collections.serialization.JImmutableHashSetMapProxy;

import javax.annotation.concurrent.Immutable;
import java.io.Serializable;


/**
 * JImmutableSetMap using a hash map for fast lookup.
 */
@Immutable
public class JImmutableHashSetMap
    extends AbstractJImmutableSetMap
    implements Serializable
{
    @SuppressWarnings("unchecked")
    private static final JImmutableHashSetMap EMPTY = new JImmutableHashSetMap(JImmutableHashMap.of(), JImmutableHashSet.of());
    private static final long serialVersionUID = -121805;

    private JImmutableHashSetMap(JImmutableMap> contents,
                                 JImmutableSet emptySet)
    {
        super(contents, emptySet);
    }

    @SuppressWarnings("unchecked")
    public static  JImmutableHashSetMap of()
    {
        return (JImmutableHashSetMap)EMPTY;
    }

    @Override
    public void checkInvariants()
    {
        checkSetMapInvariants();
    }

    @Override
    protected JImmutableSetMap create(JImmutableMap> map)
    {
        return new JImmutableHashSetMap<>(map, emptySet);
    }

    private Object writeReplace()
    {
        return new JImmutableHashSetMapProxy(this);
    }
}