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Data structures and related utilities used in LensKit.

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/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.grouplens.lenskit.collections;

import java.util.AbstractList;

/**
 * List consisting of multiple occurrences of one element.
 *
 * @param  The element type of the list.
 * @author GroupLens Research
 */
class RepeatedList extends AbstractList {
    private int size;
    private T object;

    /**
     * Construct a new repeated list.
     * @param obj The element.
     * @param sz length of the list.
     */
    public RepeatedList(T obj, int sz) {
        size = sz;
        object = obj;
    }

    @Override
    public T get(int index) {
        if (index >= 0 && index < size) {
            return object;
        } else {
            throw new IndexOutOfBoundsException();
        }
    }

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