/*
 * 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.utilities.scaling.outlier;

import elki.result.outlier.OutlierResult;
import elki.utilities.datastructures.arraylike.NumberArrayAdapter;
import elki.utilities.scaling.ScalingFunction;

/**
 * Interface for scaling functions used by Outlier evaluation such as Histograms
 * and visualization. Make sure to invoke {@link #prepare} prior to applying the
 * scaling function.
 * 
 * @author Erich Schubert
 * @since 0.3
 */
public interface OutlierScaling extends ScalingFunction {
  /**
   * Prepare is called once for each data set, before getScaled() will be
   * called. This function can be used to extract global parameters such as
   * means, minimums or maximums from the outlier scores.
   * 
   * @param or Outlier result to use
   */
  void prepare(OutlierResult or);

  /**
   * Prepare is called once for each data set, before getScaled() will be
   * called. This function can be used to extract global parameters such as
   * means, minimums or maximums from the score array.
   * 
   * The method using a full {@link OutlierResult} is preferred, as it will
   * allow access to the metadata.
   * 
   * @param array Data to process
   * @param adapter Array adapter
   */
  <A> void prepare(A array, NumberArrayAdapter<?, A> adapter);
}
