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

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableMultiset;
import org.javimmutable.collections.common.AbstractJImmutableMultiset;
import org.javimmutable.collections.serialization.JImmutableHashMultisetProxy;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

@Immutable
public class JImmutableHashMultiset
    extends AbstractJImmutableMultiset
    implements Serializable
{
    @SuppressWarnings("unchecked")
    private static final JImmutableHashMultiset EMPTY = new JImmutableHashMultiset(JImmutableHashMap.of(), 0);
    private static final long serialVersionUID = -121805;

    private JImmutableHashMultiset(JImmutableMap map,
                                   int occurrences)
    {
        super(map, occurrences);
    }

    @Override
    protected JImmutableMultiset create(JImmutableMap map,
                                           int occurrences)
    {
        return new JImmutableHashMultiset<>(map, occurrences);
    }

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

    @Nonnull
    @Override
    public JImmutableMultiset deleteAll()
    {
        return of();
    }

    @Override
    protected Map emptyMutableMap()
    {
        return new HashMap<>();
    }

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