org.javimmutable.collections.common.Subindexed Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javimmutable-collections Show documentation

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.

There is a newer version: 3.2.1

Show newest version

///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2019, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//
//     Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in
//     the documentation and/or other materials provided with the
//     distribution.
//
//     Neither the name of the Burton Computer Corporation nor the names
//     of its contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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;
    }
}