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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) 2019, 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.hash;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.common.AbstractJImmutableSet;
import org.javimmutable.collections.common.GenericSetBuilder;
import org.javimmutable.collections.serialization.JImmutableHashSetProxy;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

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

    private JImmutableHashSet(JImmutableMap map)
    {
        super(map);
    }

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

    @Nonnull
    public static  JImmutableSet.Builder builder()
    {
        return new GenericSetBuilder<>(JImmutableHashMap.builder(), map -> map.isEmpty() ? of() : new JImmutableHashSet<>(map));
    }

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

    @Override
    protected JImmutableSet create(JImmutableMap map)
    {
        return new JImmutableHashSet<>(map);
    }

    @Override
    protected Set emptyMutableSet()
    {
        return new HashSet<>();
    }

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