package de.lmu.ifi.dbs.elki.data.type;

/*
 This file is part of ELKI:
 Environment for Developing KDD-Applications Supported by Index-Structures

 Copyright (C) 2015
 Ludwig-Maximilians-Universität München
 Lehr- und Forschungseinheit für Datenbanksysteme
 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/>.
 */

/**
 * Class that combines multiple type restrictions into one using an "and" operator.
 *
 * @author Erich Schubert
 *
 * @apiviz.composedOf TypeInformation
 */
public class CombinedTypeInformation implements TypeInformation {
  /**
   * The wrapped type restrictions
   */
  private final TypeInformation[] restrictions;

  /**
   * Constructor.
   *
   * @param restrictions
   */
  public CombinedTypeInformation(TypeInformation... restrictions) {
    super();
    this.restrictions = restrictions;
  }

  @Override
  public boolean isAssignableFromType(TypeInformation type) {
    for (int i = 0; i < restrictions.length; i++) {
      if (!restrictions[i].isAssignableFromType(type)) {
        return false;
      }
    }
    return true;
  }

  @Override
  public boolean isAssignableFrom(Object other) {
    for (int i = 0; i < restrictions.length; i++) {
      if (!restrictions[i].isAssignableFrom(other)) {
        return false;
      }
    }
    return true;
  }

  @Override
  public String toString() {
    StringBuilder buf = new StringBuilder();
    for (int i = 0; i < restrictions.length; i++) {
      if (i > 0) {
        buf.append(" AND ");
      }
      buf.append(restrictions[i].toString());
    }
    return buf.toString();
  }
}