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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.Func1;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.JImmutableMap.Entry;
import org.javimmutable.collections.Proc2;
import org.javimmutable.collections.Proc2Throws;
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;

import static org.javimmutable.collections.MapEntry.entry;

public class ListCollisionMap
    implements CollisionMap
{
    private static final ListCollisionMap INSTANCE = new ListCollisionMap();

    private ListCollisionMap()
    {
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    public static  ListCollisionMap 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 K key,
                       @Nullable V value)
    {
        return new OneValueNode<>(entry(key, value));
    }

    @Nonnull
    @Override
    public Node dual(@Nonnull K key1,
                     @Nullable V value1,
                     @Nonnull K key2,
                     @Nullable V value2)
    {
        return new MultiValueNode<>(entry(key1, value1), entry(key2, value2));
    }

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

    @Nonnull
    @Override
    public Node update(@Nonnull Node node,
                       @Nonnull K key,
                       @Nullable V value)
    {
        final AbstractNode> root = root(node);
        int i = 0;
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                if (e.getValue() == value) {
                    return root;
                } else {
                    return root.assign(i, entry(key, value));
                }
            }
            i += 1;
        }
        return root.append(entry(key, value));
    }

    @Nonnull
    @Override
    public Node update(@Nonnull Node node,
                       @Nonnull K key,
                       @Nonnull Func1, V> generator)
    {
        final AbstractNode> root = root(node);
        int i = 0;
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                V value = generator.apply(Holders.of(e.getValue()));
                if (e.getValue() == value) {
                    return root;
                } else {
                    return root.assign(i, entry(key, value));
                }
            }
            i += 1;
        }
        V value = generator.apply(Holders.of());
        return root.append(entry(key, value));
    }

    @Nonnull
    @Override
    public Node delete(@Nonnull Node node,
                       @Nonnull K key)
    {
        final AbstractNode> root = root(node);
        int i = 0;
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                return root.delete(i);
            }
            i += 1;
        }
        return root;
    }

    @Override
    public V getValueOr(@Nonnull Node node,
                        @Nonnull K key,
                        V defaultValue)
    {
        final AbstractNode> root = root(node);
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                return e.getValue();
            }
        }
        return defaultValue;
    }

    @Nonnull
    @Override
    public Holder findValue(@Nonnull Node node,
                               @Nonnull K key)
    {
        final AbstractNode> root = root(node);
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                return Holders.of(e.getValue());
            }
        }
        return Holders.of();
    }

    @Nonnull
    @Override
    public Holder> findEntry(@Nonnull Node node,
                                         @Nonnull K key)
    {
        final AbstractNode> root = root(node);
        for (Entry e : root) {
            if (e.getKey().equals(key)) {
                return Holders.of(e);
            }
        }
        return Holders.of();
    }

    @Nonnull
    @Override
    public Entry 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 Proc2 proc)
    {
        root(node).forEach(e -> proc.apply(e.getKey(), e.getValue()));
    }

    @Override
    public  void forEachThrows(@Nonnull Node node,
                                                    @Nonnull Proc2Throws proc)
        throws E
    {
        root(node).forEachThrows(e -> proc.apply(e.getKey(), e.getValue()));
    }

    @Override
    public  R reduce(@Nonnull Node node,
                        R sum,
                        @Nonnull Sum2 proc)
    {
        return root(node).reduce(sum, (s, e) -> proc.apply(s, e.getKey(), e.getValue()));
    }

    @Override
    public  R reduceThrows(@Nonnull Node node,
                                                   R sum,
                                                   @Nonnull Sum2Throws proc)
        throws E
    {
        return root(node).reduceThrows(sum, (s, e) -> proc.apply(s, e.getKey(), e.getValue()));
    }
}