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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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package org.javimmutable.collections.listmap;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.IterableStreamable;
import org.javimmutable.collections.JImmutableList;
import org.javimmutable.collections.JImmutableListMap;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.SplitableIterator;
import org.javimmutable.collections.common.Conditions;
import org.javimmutable.collections.common.StreamConstants;
import org.javimmutable.collections.iterators.EntryIterableStreamable;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

@Immutable
public abstract class AbstractJImmutableListMap
    implements JImmutableListMap
{
    protected final JImmutableList emptyList;
    protected final JImmutableMap> contents;

    protected AbstractJImmutableListMap(JImmutableMap> contents,
                                        JImmutableList emptyList)
    {
        this.emptyList = emptyList;
        this.contents = contents;
    }

    @Nonnull
    @Override
    public JImmutableList getList(@Nonnull K key)
    {
        Conditions.stopNull(key);
        Holder> current = contents.find(key);
        return current.isFilled() ? current.getValue() : emptyList;
    }

    @Nonnull
    @Override
    public JImmutableListMap assign(@Nonnull K key,
                                          @Nonnull JImmutableList value)
    {
        Conditions.stopNull(key, value);
        return create(contents.assign(key, copyList(value)));
    }

    @Nonnull
    @Override
    public JImmutableListMap insert(@Nonnull K key,
                                          @Nullable V value)
    {
        return create(contents.update(key, h -> h.getValueOr(emptyList).insertLast(value)));
    }

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

    @Nonnull
    @Override
    public JImmutableListMap delete(@Nonnull K key)
    {
        return create(contents.delete(key));
    }

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

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

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

    @Nonnull
    @Override
    public Cursor valuesCursor(@Nonnull K key)
    {
        return getList(key).cursor();
    }

    @Nonnull
    @Override
    public IterableStreamable keys()
    {
        return contents.keys();
    }

    @Nonnull
    @Override
    public IterableStreamable values(@Nonnull K key)
    {
        return getList(key);
    }

    @Nonnull
    @Override
    public IterableStreamable> entries()
    {
        return new EntryIterableStreamable<>(this);
    }

    @Override
    @Nonnull
    public Cursor>> cursor()
    {
        return contents.cursor();
    }

    @Override
    @Nonnull
    public JImmutableListMap insert(@Nonnull JImmutableMap.Entry e)
    {
        return insert(e.getKey(), e.getValue());
    }

    @Override
    @Nonnull
    public SplitableIterator>> iterator()
    {
        return contents.iterator();
    }

    @Override
    public int getSpliteratorCharacteristics()
    {
        return StreamConstants.SPLITERATOR_ORDERED;
    }

    @Nullable
    @Override
    public JImmutableList get(K key)
    {
        return contents.get(key);
    }

    @Override
    public JImmutableList getValueOr(K key,
                                        JImmutableList defaultValue)
    {
        return contents.getValueOr(key, defaultValue);
    }

    @Nonnull
    @Override
    public Holder> find(K key)
    {
        return contents.find(key);
    }

    @Nonnull
    @Override
    public JImmutableListMap deleteAll()
    {
        return create(contents.deleteAll());
    }

    @Override
    public int hashCode()
    {
        return contents.hashCode();
    }

    @Override
    public boolean equals(Object o)
    {
        return (o instanceof AbstractJImmutableListMap) && contents.equals(((AbstractJImmutableListMap)o).contents);
    }

    @Override
    public String toString()
    {
        return contents.toString();
    }

    protected void checkListMapInvariants()
    {
        contents.checkInvariants();
        for (JImmutableMap.Entry> entry : contents) {
            entry.getValue().checkInvariants();
        }
    }

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

    /**
     * Overridable by derived classes to create a compatible copy of the specified list.
     * Default implementation simply returns the original.
     */
    protected JImmutableList copyList(JImmutableList original)
    {
        return original;
    }
}