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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
//
// Copyright (c) 2018, Burton Computer Corporation
// All rights reserved.
//
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//
//     Redistributions in binary form must reproduce the above copyright
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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.JImmutableHashSet;
import org.javimmutable.collections.serialization.JImmutableTreeSetMapProxy;
import org.javimmutable.collections.tree.JImmutableTreeMap;

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

/**
 * JImmutableSetMap implementation that allows keys to be traversed in sorted order using a Comparator
 * of the natural ordering of the keys if they implement Comparable.
 */
@Immutable
public class JImmutableTreeSetMap
    extends AbstractJImmutableSetMap
    implements Serializable
{
    @SuppressWarnings({"unchecked"})
    private static final JImmutableTreeSetMap EMPTY = new JImmutableTreeSetMap(JImmutableTreeMap.of(), JImmutableHashSet.of());
    private static final long serialVersionUID = -121805;

    private final Comparator comparator;

    private JImmutableTreeSetMap(JImmutableTreeMap> contents,
                                 JImmutableSet emptySet)
    {
        this(contents, contents.getComparator(), emptySet);
    }

    private JImmutableTreeSetMap(JImmutableMap> contents,
                                 Comparator comparator,
                                 JImmutableSet emptySet)
    {
        super(contents, emptySet);
        this.comparator = comparator;
    }

    /**
     * Constructs an empty set map whose keys are sorted in their natural ordering. The keys must
     * implement Comparable.
     */
    @SuppressWarnings("unchecked")
    public static , V> JImmutableTreeSetMap of()
    {
        return (JImmutableTreeSetMap)EMPTY;
    }

    /**
     * Constructs an empty set map using the specified Comparator. Note that the Comparator MUST BE IMMUTABLE.
     * The Comparator will be retained and used throughout the life of the map and its offspring and will
     * be aggressively shared, so it is imperative that the Comparator be completely immutable.
     */
    public static  JImmutableTreeSetMap of(Comparator comparator)
    {
        return new JImmutableTreeSetMap<>(JImmutableTreeMap.of(comparator), JImmutableHashSet.of());
    }

    public Comparator getComparator()
    {
        return comparator;
    }

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

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

    JImmutableMap> getMap()
    {
        return contents;
    }

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