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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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package org.javimmutable.collections.list;

import org.javimmutable.collections.Func2;
import org.javimmutable.collections.InvariantCheckable;
import org.javimmutable.collections.Proc1Throws;
import org.javimmutable.collections.SplitableIterable;
import org.javimmutable.collections.Sum1Throws;
import org.javimmutable.collections.common.CollisionMap;
import org.javimmutable.collections.iterators.GenericIterator;

import javax.annotation.Nonnull;
import java.util.function.Consumer;

abstract class AbstractNode
    implements SplitableIterable,
               InvariantCheckable,
               GenericIterator.Iterable,
               CollisionMap.Node
{
    abstract boolean isEmpty();

    abstract int size();

    abstract int depth();

    abstract T get(int index);

    @Nonnull
    abstract AbstractNode append(T value);

    @Nonnull
    abstract AbstractNode append(@Nonnull AbstractNode node);

    @Nonnull
    abstract AbstractNode prepend(T value);

    @Nonnull
    abstract AbstractNode prepend(@Nonnull AbstractNode node);

    @Nonnull
    abstract AbstractNode assign(int index,
                                    T value);

    @Nonnull
    abstract AbstractNode insert(int index,
                                    T value);

    @Nonnull
    abstract AbstractNode deleteFirst();

    @Nonnull
    abstract AbstractNode deleteLast();

    @Nonnull
    abstract AbstractNode delete(int index);

    @Nonnull
    abstract AbstractNode prefix(int limit);

    @Nonnull
    abstract AbstractNode suffix(int offset);

    @Override
    public abstract void checkInvariants();

    abstract void copyTo(T[] array,
                         int offset);

    @Nonnull
    AbstractNode left()
    {
        throw new UnsupportedOperationException();
    }

    @Nonnull
    AbstractNode right()
    {
        throw new UnsupportedOperationException();
    }

    @Override
    public int iterableSize()
    {
        return size();
    }

    @Override
    public abstract void forEach(Consumer action);

    @Override
    public abstract  void forEachThrows(@Nonnull Proc1Throws proc)
        throws E;

    @Override
    public abstract  V reduce(V initialValue,
                                 Func2 accumulator);

    @Override
    public abstract  V reduceThrows(V initialValue,
                                                            Sum1Throws accumulator)
        throws E;
}