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/*
 * SonarSource Analyzers Commons
 * Copyright (C) 2009-2024 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * 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 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.sonarsource.analyzer.commons.collections;

public final class PCollections {

  private PCollections() {
  }

  /**
   * Returns a persistent set containing zero elements.
   *
   * @param  the {@code PSet}'s element type
   * @return an empty {@code PSet}
   */
  public static  PSet emptySet() {
    return AVLTree.create();
  }

  /**
   * Returns a persistent map containing zero mappings.
   *
   * @param  the {@code PMap}'s key type
   * @param  the {@code PMap}'s value type
   * @return an empty {@code PMap}
   */
  public static  PMap emptyMap() {
    return AVLTree.create();
  }

  /**
   * Returns a persistent stack containing zero elements.
   *
   * @param  the {@code PStack}'s element type
   * @return an empty {@code PStack}
   */
  @SuppressWarnings("unchecked")
  public static  PStack emptyStack() {
    return SinglyLinkedList.EMPTY;
  }
}