org.javimmutable.collections.array.bit32.FullBit32Array Maven / Gradle / Ivy

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//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2017, Burton Computer Corporation
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package org.javimmutable.collections.array.bit32;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.Indexed;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.MapEntry;
import org.javimmutable.collections.SplitableIterator;
import org.javimmutable.collections.cursors.StandardCursor;
import org.javimmutable.collections.iterators.AbstractSplitableIterator;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.NoSuchElementException;

@Immutable
public class FullBit32Array
    extends Bit32Array
{
    private final T[] entries;

    FullBit32Array(T[] entries)
    {
        assert entries.length == 32;
        this.entries = entries;
    }

    @SuppressWarnings("unchecked")
    FullBit32Array(Indexed source,
                   int offset)
    {
        assert (source.size() - offset) >= 32;
        T[] entries = (T[])new Object[32];
        for (int index = 0; index < 32; ++index) {
            entries[index] = source.get(offset++);
        }
        this.entries = entries;
    }

    @Nonnull
    @Override
    public Bit32Array assign(int key,
                                @Nullable T value)
    {
        T current = entries[key];
        if (current == value) {
            return this;
        } else {
            T[] newEntries = entries.clone();
            newEntries[key] = value;
            return new FullBit32Array(newEntries);
        }
    }

    @Nonnull
    @Override
    public Bit32Array delete(int key)
    {
        return StandardBit32Array.fullWithout(entries, key);
    }

    @Override
    public int firstIndex()
    {
        return 0;
    }

    @Override
    @Nullable
    public T getValueOr(int index,
                        @Nullable T defaultValue)
    {
        return entries[index];
    }

    @Nonnull
    @Override
    public Holder find(int index)
    {
        return Holders.of(entries[index]);
    }

    @Override
    public int size()
    {
        return 32;
    }

    @Override
    @Nonnull
    public Cursor> cursor()
    {
        return StandardCursor.of(new CursorSource(0));
    }

    @Nonnull
    @Override
    public SplitableIterator> iterator()
    {
        return new IteratorImpl();
    }

    @Override
    public void checkInvariants()
    {
        //TODO: fix empty checkInvariants()
    }

    private class CursorSource
        implements StandardCursor.Source>
    {
        private final int index;

        private CursorSource(int index)
        {
            this.index = index;
        }

        @Override
        public boolean atEnd()
        {
            return index >= 32;
        }

        @Override
        public JImmutableMap.Entry currentValue()
        {
            return MapEntry.of(index, entries[index]);
        }

        @Override
        public StandardCursor.Source> advance()
        {
            return new CursorSource(index + 1);
        }
    }

    private class IteratorImpl
        extends AbstractSplitableIterator>
    {
        private int index;

        private IteratorImpl()
        {
            this.index = 0;
        }

        @Override
        public boolean hasNext()
        {
            return index < entries.length;
        }

        @Override
        public JImmutableMap.Entry next()
        {
            if (index >= entries.length) {
                throw new NoSuchElementException();
            }
            final JImmutableMap.Entry answer = MapEntry.of(index, entries[index]);
            index += 1;
            return answer;
        }
    }
}