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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) 2017, Burton Computer Corporation
// All rights reserved.
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//     Redistributions in binary form must reproduce the above copyright
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package org.javimmutable.collections.common;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.IterableStreamable;
import org.javimmutable.collections.JImmutableArray;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.MapEntry;
import org.javimmutable.collections.cursors.TransformCursor;
import org.javimmutable.collections.iterators.TransformStreamable;

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

@Immutable
public abstract class AbstractJImmutableArray
    implements JImmutableArray
{
    @Override
    @Nullable
    public T get(int index)
    {
        return find(index).getValueOrNull();
    }

    @Nonnull
    @Override
    public Holder> findEntry(int key)
    {
        Holder value = find(key);
        return value.isFilled() ? Holders.of(MapEntry.of(key, value.getValue())) : Holders.of();
    }

    @Override
    public boolean isEmpty()
    {
        return size() == 0;
    }

    /**
     * Adds the key/value pair to this map.  Any value already existing for the specified key
     * is replaced with the new value.
     */
    @Override
    @Nonnull
    public JImmutableArray insert(@Nullable JImmutableMap.Entry e)
    {
        return (e == null) ? this : assign(e.getKey(), e.getValue());
    }

    @Nonnull
    @Override
    public JImmutableArray getInsertableSelf()
    {
        return this;
    }

    @Nonnull
    @Override
    public Cursor keysCursor()
    {
        return TransformCursor.ofKeys(cursor());
    }

    @Nonnull
    @Override
    public Cursor valuesCursor()
    {
        return TransformCursor.ofValues(cursor());
    }

    @Nonnull
    @Override
    public IterableStreamable keys()
    {
        return TransformStreamable.ofKeys(this);
    }

    @Nonnull
    @Override
    public IterableStreamable values()
    {
        return TransformStreamable.ofValues(this);
    }

    @Override
    public int getSpliteratorCharacteristics()
    {
        return StreamConstants.SPLITERATOR_ORDERED;
    }

    @Nonnull
    @Override
    public Map getMap()
    {
        return ArrayToMapAdaptor.of(this);
    }
}