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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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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//     Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//
//     Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in
//     the documentation and/or other materials provided with the
//     distribution.
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//     Neither the name of the Burton Computer Corporation nor the names
//     of its contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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package org.javimmutable.collections.hash.hamt;

import org.javimmutable.collections.Func1;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.Proc2;
import org.javimmutable.collections.Proc2Throws;
import org.javimmutable.collections.SplitableIterable;
import org.javimmutable.collections.SplitableIterator;
import org.javimmutable.collections.Sum2;
import org.javimmutable.collections.Sum2Throws;
import org.javimmutable.collections.common.CollisionMap;
import org.javimmutable.collections.iterators.GenericIterator;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public interface HamtNode
{
    Holder find(@Nonnull CollisionMap collisionMap,
                   int hashCode,
                   @Nonnull K hashKey);

    V getValueOr(@Nonnull CollisionMap collisionMap,
                 int hashCode,
                 @Nonnull K hashKey,
                 V defaultValue);

    @Nonnull
    HamtNode assign(@Nonnull CollisionMap collisionMap,
                          int hashCode,
                          @Nonnull K hashKey,
                          @Nullable V value);

    @Nonnull
    HamtNode update(@Nonnull CollisionMap collisionMap,
                          int hashCode,
                          @Nonnull K hashKey,
                          @Nonnull Func1, V> generator);

    @Nonnull
    HamtNode delete(@Nonnull CollisionMap collisionMap,
                          int hashCode,
                          @Nonnull K hashKey);

    boolean isEmpty(@Nonnull CollisionMap collisionMap);

    int size(@Nonnull CollisionMap collisionMap);

    default void checkInvariants(@Nonnull CollisionMap collisionMap)
    {
    }

    @Nullable
    GenericIterator.State> iterateOverRange(@Nonnull CollisionMap collisionMap,
                                                                      @Nullable GenericIterator.State> parent,
                                                                      int offset,
                                                                      int limit);

    @Nonnull
    default GenericIterator.Iterable> genericIterable(@Nonnull CollisionMap collisionMap)
    {
        return new GenericIterator.Iterable>()
        {
            @Nullable
            @Override
            public GenericIterator.State> iterateOverRange(@Nullable GenericIterator.State> parent,
                                                                                     int offset,
                                                                                     int limit)
            {
                return HamtNode.this.iterateOverRange(collisionMap, parent, offset, limit);
            }

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

    @Nonnull
    default SplitableIterable> iterable(@Nonnull CollisionMap collisionMap)
    {
        return () -> iterator(collisionMap);
    }

    @Nonnull
    default SplitableIterator> iterator(@Nonnull CollisionMap collisionMap)
    {
        return new GenericIterator<>(genericIterable(collisionMap), 0, size(collisionMap));
    }

    void forEach(@Nonnull CollisionMap collisionMap,
                 @Nonnull Proc2 proc);

     void forEachThrows(@Nonnull CollisionMap collisionMap,
                                             @Nonnull Proc2Throws proc)
        throws E;

     R reduce(@Nonnull CollisionMap collisionMap,
                 R sum,
                 @Nonnull Sum2 proc);

     R reduceThrows(@Nonnull CollisionMap collisionMap,
                                            R sum,
                                            @Nonnull Sum2Throws proc)
        throws E;
}