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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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// Burton Computer Corporation
// http://www.burton-computer.com
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// Copyright (c) 2017, Burton Computer Corporation
// All rights reserved.
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package org.javimmutable.collections.tree;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.common.AbstractJImmutableMultiset;
import org.javimmutable.collections.serialization.JImmutableTreeMultisetProxy;

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

@Immutable
public class JImmutableTreeMultiset
    extends AbstractJImmutableMultiset
    implements Serializable
{
    @SuppressWarnings("unchecked")
    private static final JImmutableTreeMultiset EMPTY = new JImmutableTreeMultiset(new ComparableComparator());

    private final Comparator comparator;

    private JImmutableTreeMultiset(Comparator comparator)
    {
        this(JImmutableTreeMap.of(comparator), 0, comparator);
    }

    private JImmutableTreeMultiset(JImmutableMap map,
                                   int occurrences,
                                   Comparator comparator)
    {
        super(map, occurrences);
        this.comparator = comparator;
    }

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

    public Comparator getComparator()
    {
        return comparator;
    }

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

    public static  JImmutableTreeMultiset of(Comparator comparator)
    {
        return new JImmutableTreeMultiset<>(comparator);
    }

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

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

    JImmutableMap getMap()
    {
        return map;
    }
    
    private Object writeReplace()
    {
        return new JImmutableTreeMultisetProxy(this);
    }
}