/*
 * 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.util;

import elki.index.tree.AbstractNode;
import elki.index.tree.spatial.SpatialEntry;
import elki.utilities.datastructures.arraylike.ArrayAdapter;

/**
 * Access the entries of a node as array-like.
 * 
 * @author Erich Schubert
 * @since 0.5.0
 */
public class NodeArrayAdapter implements ArrayAdapter<SpatialEntry, AbstractNode<? extends SpatialEntry>> {
  /**
   * Static adapter.
   */
  public static final NodeArrayAdapter STATIC = new NodeArrayAdapter();

  /**
   * Constructor.
   */
  protected NodeArrayAdapter() {
    super();
  }

  @Override
  public int size(AbstractNode<? extends SpatialEntry> array) {
    return array.getNumEntries();
  }

  @Override
  public SpatialEntry get(AbstractNode<? extends SpatialEntry> array, int off) throws IndexOutOfBoundsException {
    return array.getEntry(off);
  }
}