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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
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// Copyright (c) 2021, Burton Computer Corporation
// All rights reserved.
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package org.javimmutable.collections.list;

import org.javimmutable.collections.Proc1;
import org.javimmutable.collections.Proc1Throws;
import org.javimmutable.collections.Sum1;
import org.javimmutable.collections.Sum1Throws;
import org.javimmutable.collections.common.CollisionSet;
import org.javimmutable.collections.iterators.GenericIterator;

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

public class ListCollisionSet
    implements CollisionSet
{
    @SuppressWarnings("rawtypes")
    private static final ListCollisionSet INSTANCE = new ListCollisionSet();

    private ListCollisionSet()
    {
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    public static  ListCollisionSet instance()
    {
        return INSTANCE;
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    private AbstractNode root(@Nonnull Node node)
    {
        return (AbstractNode)node;
    }

    @Nonnull
    @Override
    public Node empty()
    {
        return EmptyNode.instance();
    }

    @Nonnull
    @Override
    public Node single(@Nonnull T value)
    {
        return new OneValueNode<>(value);
    }

    @Nonnull
    @Override
    public Node dual(@Nonnull T value1,
                     @Nonnull T value2)
    {
        return new MultiValueNode<>(value1, value2);
    }

    @Override
    public int size(@Nonnull Node node)
    {
        return root(node).size();
    }

    @Override
    public boolean contains(@Nonnull Node node,
                            @Nonnull T value)
    {
        for (T v : root(node)) {
            if (v.equals(value)) {
                return true;
            }
        }
        return false;
    }

    @Nonnull
    @Override
    public Node insert(@Nonnull Node node,
                       @Nonnull T value)
    {
        final AbstractNode root = root(node);
        int i = 0;
        for (T v : root) {
            if (v.equals(value)) {
                return root;
            }
            i += 1;
        }
        return root.append(value);
    }

    @Nonnull
    @Override
    public Node delete(@Nonnull Node node,
                       @Nonnull T value)
    {
        final AbstractNode root = root(node);
        int i = 0;
        for (T v : root) {
            if (v.equals(value)) {
                return root.delete(i);
            }
            i += 1;
        }
        return root;
    }

    @Nonnull
    @Override
    public T first(@Nonnull Node node)
    {
        return root(node).get(0);
    }

    @Nullable
    @Override
    public GenericIterator.State iterateOverRange(@Nonnull Node node,
                                                     @Nullable GenericIterator.State parent,
                                                     int offset,
                                                     int limit)
    {
        return root(node).iterateOverRange(parent, offset, limit);
    }

    @Override
    public void forEach(@Nonnull Node node,
                        @Nonnull Proc1 proc)
    {
        root(node).forEach(proc::apply);
    }

    @Override
    public  void forEachThrows(@Nonnull Node node,
                                                    @Nonnull Proc1Throws proc)
        throws E
    {
        root(node).forEachThrows(proc);
    }

    @Override
    public  R reduce(@Nonnull Node node,
                        R sum,
                        @Nonnull Sum1 proc)
    {
        return root(node).reduce(sum, proc::apply);
    }

    @Override
    public  R reduceThrows(@Nonnull Node node,
                                                   R sum,
                                                   @Nonnull Sum1Throws proc)
        throws E
    {
        return root(node).reduceThrows(sum, proc);
    }
}