org.javimmutable.collections.hash.set.SetEmptyNode Maven / Gradle / Ivy

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// Burton Computer Corporation
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// Copyright (c) 2019, Burton Computer Corporation
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package org.javimmutable.collections.hash.set;

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;
import javax.annotation.concurrent.Immutable;

@Immutable
public class SetEmptyNode
    implements SetNode
{
    @SuppressWarnings("rawtypes")
    private static final SetEmptyNode EMPTY = new SetEmptyNode();

    @SuppressWarnings("unchecked")
    public static  SetNode of()
    {
        return EMPTY;
    }

    @Override
    public boolean contains(@Nonnull CollisionSet collisionSet,
                            int hashCode,
                            @Nonnull T value)
    {
        return false;
    }

    @Nonnull
    @Override
    public SetNode insert(@Nonnull CollisionSet collisionSet,
                             int hashCode,
                             @Nonnull T value)
    {
        return new SetSingleValueLeafNode<>(hashCode, value);
    }

    @Nonnull
    @Override
    public SetNode delete(@Nonnull CollisionSet collisionSet,
                             int hashCode,
                             @Nonnull T value)
    {
        return this;
    }

    @Override
    public boolean isLeaf()
    {
        return false;
    }

    @Override
    public boolean isEmpty(@Nonnull CollisionSet collisionSet)
    {
        return true;
    }

    @Override
    public int size(@Nonnull CollisionSet collisionSet)
    {
        return 0;
    }

    @Nullable
    @Override
    public GenericIterator.State iterateOverRange(@Nonnull CollisionSet collisionSet,
                                                     @Nullable GenericIterator.State parent,
                                                     int offset,
                                                     int limit)
    {
        assert offset == 0 && limit == 0;
        return parent;
    }

    @Override
    public void forEach(@Nonnull CollisionSet collisionSet,
                        @Nonnull Proc1 proc)
    {
    }

    @Override
    public  void forEachThrows(@Nonnull CollisionSet collisionSet,
                                                    @Nonnull Proc1Throws proc)
        throws E
    {
    }

    @Override
    public  R reduce(@Nonnull CollisionSet collisionSet,
                        R sum,
                        @Nonnull Sum1 proc)
    {
        return sum;
    }

    @Override
    public  R reduceThrows(@Nonnull CollisionSet collisionSet,
                                                   R sum,
                                                   @Nonnull Sum1Throws proc)
        throws E
    {
        return sum;
    }

    @Nonnull
    @Override
    public SetNode liftNode(int index)
    {
        throw new UnsupportedOperationException();
    }
}