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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) 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.JImmutableSet;
import org.javimmutable.collections.common.AbstractJImmutableSet;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;

@Immutable
public class JImmutableTreeSet
        extends AbstractJImmutableSet
{
    @SuppressWarnings("unchecked")
    private static final JImmutableTreeSet EMPTY = new JImmutableTreeSet(new ComparableComparator());

    private final Comparator comparator;

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

    private JImmutableTreeSet(JImmutableMap map,
                              Comparator comparator)
    {
        super(map);
        this.comparator = comparator;
    }

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

    public Comparator getComparator()
    {
        return comparator;
    }

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

    public static  JImmutableTreeSet of(Comparator comparator)
    {
        return new JImmutableTreeSet(comparator);
    }

    @Override
    protected JImmutableSet create(JImmutableMap map)
    {
        return new JImmutableTreeSet(map, comparator);
    }

    @Override
    protected Set emptyMutableSet()
    {
        return new TreeSet(comparator);
    }
}