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• AbstractAssociator.java

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weka.associations.AbstractAssociator Maven / Gradle / Ivy

/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

/*
 *    Associator.java
 *    Copyright (C) 1999-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.associations;

import weka.core.Capabilities;
import weka.core.CapabilitiesHandler;
import weka.core.CapabilitiesIgnorer;
import weka.core.CommandlineRunnable;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.RevisionHandler;
import weka.core.RevisionUtils;
import weka.core.SerializedObject;
import weka.core.Utils;

import java.io.Serializable;
import java.util.Enumeration;
import java.util.Vector;

/**
 * Abstract scheme for learning associations. All schemes for learning
 * associations implemement this class
 *
 * @author Eibe Frank ([email protected])
 * @version $Revision: 12201 $
 */
public abstract class AbstractAssociator
  implements Cloneable, Associator, Serializable, CapabilitiesHandler,
  CapabilitiesIgnorer, RevisionHandler, OptionHandler, CommandlineRunnable {

  /** for serialization */
  private static final long serialVersionUID = -3017644543382432070L;

  /** Whether capabilities should not be checked */
  protected boolean m_DoNotCheckCapabilities = false;

  /**
   * Returns an enumeration describing the available options.
   *
   * @return an enumeration of all the available options.
   */
  @Override
  public Enumeration listOptions() {
    Vector newVector = Option
      .listOptionsForClassHierarchy(this.getClass(), AbstractAssociator.class);

    return newVector.elements();
  }

  /**
   * Parses a given list of options.
   *
   * @param options the list of options as an array of strings
   * @throws Exception if an option is not supported
   */
  @Override
  public void setOptions(String[] options) throws Exception {
    Option.setOptionsForHierarchy(options, this, AbstractAssociator.class);
  }

  /**
   * Gets the current settings of the associator
   *
   * @return an array of strings suitable for passing to setOptions
   */
  public String[] getOptions() {
    Vector options = new Vector();
    for (String s : Option.getOptionsForHierarchy(this,
      AbstractAssociator.class)) {
      options.add(s);
    }
    return options.toArray(new String[0]);
  }

  /**
   * Returns the tip text for this property
   * 
   * @return tip text for this property suitable for displaying in the
   *         explorer/experimenter gui
   */
  public String doNotCheckCapabilitiesTipText() {
    return "If set, associator capabilities are not checked before associator is built"
      + " (Use with caution to reduce runtime).";
  }

  /**
   * Set whether not to check capabilities.
   * 
   * @param doNotCheckCapabilities true if capabilities are not to be checked.
   */
  public void setDoNotCheckCapabilities(boolean doNotCheckCapabilities) {

    m_DoNotCheckCapabilities = doNotCheckCapabilities;
  }

  /**
   * Get whether capabilities checking is turned off.
   * 
   * @return true if capabilities checking is turned off.
   */
  public boolean getDoNotCheckCapabilities() {

    return m_DoNotCheckCapabilities;
  }

  /**
   * Creates a new instance of a associator given it's class name and (optional)
   * arguments to pass to it's setOptions method. If the associator implements
   * OptionHandler and the options parameter is non-null, the associator will
   * have it's options set.
   *
   * @param associatorName the fully qualified class name of the associator
   * @param options an array of options suitable for passing to setOptions. May
   *          be null.
   * @return the newly created associator, ready for use.
   * @exception Exception if the associator name is invalid, or the options
   *              supplied are not acceptable to the associator
   */
  public static Associator forName(String associatorName, String[] options)
    throws Exception {

    return (Associator) Utils.forName(Associator.class, associatorName,
      options);
  }

  /**
   * Creates a deep copy of the given associator using serialization.
   *
   * @param model the associator to copy
   * @return a deep copy of the associator
   * @exception Exception if an error occurs
   */
  public static Associator makeCopy(Associator model) throws Exception {
    return (Associator) new SerializedObject(model).getObject();
  }

  /**
   * Creates copies of the current associator. Note that this method now uses
   * Serialization to perform a deep copy, so the Associator object must be
   * fully Serializable. Any currently built model will now be copied as well.
   *
   * @param model an example associator to copy
   * @param num the number of associators copies to create.
   * @return an array of associators.
   * @exception Exception if an error occurs
   */
  public static Associator[] makeCopies(Associator model, int num)
    throws Exception {

    if (model == null) {
      throw new Exception("No model associator set");
    }
    Associator[] associators = new Associator[num];
    SerializedObject so = new SerializedObject(model);
    for (int i = 0; i < associators.length; i++) {
      associators[i] = (Associator) so.getObject();
    }
    return associators;
  }

  /**
   * Returns the Capabilities of this associator. Maximally permissive
   * capabilities are allowed by default. Derived associators should override
   * this method and first disable all capabilities and then enable just those
   * capabilities that make sense for the scheme.
   *
   * @return the capabilities of this object
   * @see Capabilities
   */
  public Capabilities getCapabilities() {
    Capabilities defaultC = new Capabilities(this);
    defaultC.enableAll();

    return defaultC;
  }

  /**
   * Returns the revision string.
   * 
   * @return the revision
   */
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 12201 $");
  }

  /**
   * runs the associator with the given commandline options
   * 
   * @param associator the associator to run
   * @param options the commandline options
   */
  public static void runAssociator(Associator associator, String[] options) {
    try {
      if (associator instanceof CommandlineRunnable) {
        ((CommandlineRunnable)associator).preExecution();
      }
      System.out.println(AssociatorEvaluation.evaluate(associator, options));
    } catch (Exception e) {
      if ((e.getMessage() != null)
        && (e.getMessage().indexOf("General options") == -1))
        e.printStackTrace();
      else
        System.err.println(e.getMessage());
    }
    try {
      if (associator instanceof CommandlineRunnable) {
        ((CommandlineRunnable) associator).postExecution();
      }
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  /**
   * Perform any setup stuff that might need to happen before commandline
   * execution. Subclasses should override if they need to do something here
   *
   * @throws Exception if a problem occurs during setup
   */
  @Override
  public void preExecution() throws Exception {
  }

  /**
   * Execute the supplied object. Subclasses need to override this method.
   *
   * @param toRun the object to execute
   * @param options any options to pass to the object
   * @throws Exception if a problem occurs
   */
  @Override
  public void run(Object toRun, String[] options) throws Exception {
    if (!(toRun instanceof Associator)) {
      throw new IllegalArgumentException(
        "Object to run is not an instance of Associator!");
    }

    preExecution();
    runAssociator((Associator) toRun, options);
    postExecution();
  }

  /**
   * Perform any teardown stuff that might need to happen after execution.
   * Subclasses should override if they need to do something here
   *
   * @throws Exception if a problem occurs during teardown
   */
  @Override
  public void postExecution() throws Exception {
  }
}