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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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package org.javimmutable.collections.common;

import org.javimmutable.collections.Indexed;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

/**
 * Wrapper for an Indexed that only provides access to a portion of the full Indexed's values.
 *
 * @param 
 */
@Immutable
public class Subindexed
        implements Indexed
{
    private final Indexed source;
    private final int offset;
    private final int size;

    public Subindexed(@Nonnull Indexed source,
                      int offset,
                      int limit)
    {
        if ((offset < 0) || (offset > source.size()) || (limit < offset) || (limit > source.size())) {
            throw new IndexOutOfBoundsException();
        }
        this.source = source;
        this.offset = offset;
        this.size = limit - offset;
    }

    public static  Subindexed of(@Nonnull Indexed source,
                                       int offset)
    {
        return new Subindexed(source, offset, source.size());
    }

    public static  Subindexed of(@Nonnull Indexed source,
                                       int offset,
                                       int limit)
    {
        return new Subindexed(source, offset, limit);
    }

    @Override
    public T get(int index)
    {
        if ((index < 0) || (index >= size)) {
            throw new IndexOutOfBoundsException();
        }
        return source.get(offset + index);
    }

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