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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.common;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableMultiset;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.SplitableIterator;
import org.javimmutable.collections.cursors.Cursors;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.Iterator;
import java.util.Set;

@Immutable
public abstract class AbstractJImmutableSet
    implements JImmutableSet
{
    protected final JImmutableMap map;

    protected AbstractJImmutableSet(JImmutableMap map)
    {
        this.map = map;
    }

    @Override
    @Nonnull
    public JImmutableSet insert(@Nonnull T value)
    {
        JImmutableMap newMap = map.assign(value, Boolean.TRUE);
        return (newMap != map) ? create(newMap) : this;
    }

    @Nonnull
    @Override
    public JImmutableSet getInsertableSelf()
    {
        return this;
    }

    @Override
    @Nonnull
    public JImmutableSet insertAll(@Nonnull Iterable values)
    {
        return union(values.iterator());
    }

    @Override
    @Nonnull
    public JImmutableSet insertAll(@Nonnull Cursor values)
    {
        return union(values.iterator());
    }

    @Override
    @Nonnull
    public JImmutableSet insertAll(@Nonnull Iterator values)
    {
        return union(values);
    }

    @Override
    public boolean contains(@Nullable T value)
    {
        return (value != null) && map.getValueOr(value, Boolean.FALSE);
    }

    @Override
    public boolean containsAll(@Nonnull Iterable values)
    {
        return containsAll(values.iterator());
    }

    @Override
    public boolean containsAll(@Nonnull Cursor values)
    {
        for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
            if (!contains(c.getValue())) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean containsAll(@Nonnull Iterator values)
    {
        while (values.hasNext()) {
            if (!contains(values.next())) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean containsAny(@Nonnull Iterable values)
    {
        return containsAny(values.iterator());
    }

    @Override
    public boolean containsAny(@Nonnull Cursor values)
    {
        for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
            if (contains(c.getValue())) {
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean containsAny(@Nonnull Iterator values)
    {
        while (values.hasNext()) {
            if (contains(values.next())) {
                return true;
            }
        }
        return false;
    }

    @Nonnull
    @Override
    public JImmutableSet delete(T value)
    {
        JImmutableMap newMap = map.delete(value);
        return (newMap != map) ? create(newMap) : this;
    }

    @Nonnull
    @Override
    public JImmutableSet deleteAll(@Nonnull Iterable other)
    {
        return deleteAll(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet deleteAll(@Nonnull Cursor values)
    {
        return deleteAll(values.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet deleteAll(@Nonnull Iterator values)
    {
        JImmutableMap newMap = map;
        while (values.hasNext()) {
            final T value = values.next();
            if (value != null) {
                newMap = newMap.delete(value);
            }
        }
        return (newMap != map) ? create(newMap) : this;
    }

    @Nonnull
    @Override
    public JImmutableSet union(@Nonnull Iterable other)
    {
        return union(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet union(@Nonnull Cursor values)
    {
        return union(values.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet union(@Nonnull Iterator values)
    {
        JImmutableMap newMap = map;
        while (values.hasNext()) {
            final T value = values.next();
            if (value != null) {
                newMap = newMap.assign(value, Boolean.TRUE);
            }
        }
        return (newMap != map) ? create(newMap) : this;
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull Iterable other)
    {
        return intersection(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull Cursor values)
    {
        return intersection(values.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull Iterator values)
    {
        if (isEmpty()) {
            return this;
        }

        if (!values.hasNext()) {
            return deleteAll();
        }

        Set otherSet = emptyMutableSet();
        while (values.hasNext()) {
            final T value = values.next();
            if (value != null) {
                otherSet.add(value);
            }
        }

        JImmutableMap newMap = map;
        for (JImmutableMap.Entry entry : map) {
            if (!otherSet.contains(entry.getKey())) {
                newMap = newMap.delete(entry.getKey());
            }
        }

        return (newMap != map) ? create(newMap) : this;
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull JImmutableSet other)
    {
        return intersection(other.getSet());
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull Set other)
    {
        if (isEmpty()) {
            return this;
        } else if (other.isEmpty()) {
            return deleteAll();
        } else {
            JImmutableMap newMap = map;
            for (T value : map.keysCursor()) {
                if (!other.contains(value)) {
                    newMap = newMap.delete(value);
                }
            }
            return (newMap != map) ? create(newMap) : this;
        }
    }

    @Override
    public int size()
    {
        return map.size();
    }

    @Override
    public boolean isEmpty()
    {
        return map.isEmpty();
    }

    @Nonnull
    @Override
    public Set getSet()
    {
        return SetAdaptor.of(this);
    }

    @Override
    @Nonnull
    public Cursor cursor()
    {
        return map.keysCursor();
    }

    @Nonnull
    @Override
    public SplitableIterator iterator()
    {
        return map.keys().iterator();
    }

    @Override
    public int getSpliteratorCharacteristics()
    {
        return map.keys().getSpliteratorCharacteristics();
    }

    @Override
    public int hashCode()
    {
        return Cursors.computeHashCode(cursor());
    }

    @Override
    public boolean equals(Object o)
    {
        if (o == this) {
            return true;
        } else if (o == null) {
            return false;
        } else if (o instanceof JImmutableMultiset) {
            return o.equals(this);
        } else if (o instanceof JImmutableSet) {
            return getSet().equals(((JImmutableSet)o).getSet());
        } else {
            return (o instanceof Set) && getSet().equals(o);
        }
    }

    @Override
    public String toString()
    {
        return Cursors.makeString(cursor());
    }

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

    protected void checkSetInvariants()
    {
        map.checkInvariants();
        for (JImmutableMap.Entry entry : map.cursor()) {
            if (!entry.getValue()) {
                throw new RuntimeException();
            }
        }
    }

    /**
     * Implemented by derived classes to create a new instance of the appropriate class.
     */
    protected abstract JImmutableSet create(JImmutableMap map);

    /**
     * Implemented by derived classes to create a new empty Set
     */
    protected abstract Set emptyMutableSet();
}