/*
 * This file is part of ELKI:
 * Environment for Developing KDD-Applications Supported by Index-Structures
 *
 * Copyright (C) 2022
 * ELKI Development Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package elki.index.tree.spatial.rstarvariants.xtree.util;

import it.unimi.dsi.fastutil.ints.IntIterator;

/**
 * Iterator provider for an integer range from <code>from</code> to
 * <code>to</code>. Covers <code>[from,to[</code>.
 *
 * @author Marisa Thoma
 * @since 0.7.5
 */
public class IntegerRangeIterator implements IntIterator {
  protected int n, to;

  public IntegerRangeIterator(int from, int to) {
    this.n = from;
    this.to = to;
  }

  @Override
  public boolean hasNext() {
    return n < to;
  }

  @Override
  public int nextInt() {
    return n++; // Post-increment!
  }

  @Deprecated
  @Override
  public Integer next() {
    return nextInt();
  }

  @Override
  public int skip(int n) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }
}
