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• ListOptions.java

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weka.core.ListOptions 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 .
 */

/*
 * ListOptions.java
 * Copyright (C) 2006-2012 University of Waikato, Hamilton, New Zealand
 */

package weka.core;

import java.util.Enumeration;
import java.util.Vector;

/**
 * Lists the options of an OptionHandler
 * 
 * @author fracpete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 10203 $
 */
public class ListOptions implements OptionHandler, RevisionHandler {

  /** the classname */
  protected String m_Classname = ListOptions.class.getName();

  /**
   * Returns an enumeration describing the available options.
   * 
   * @return an enumeration of all the available options.
   */
  @Override
  public Enumeration listOptions() {
    Vector result = new Vector();

    result.addElement(new Option("\tThe class to load.", "W", 1,
      "-W "));

    return result.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 {
    String tmpStr;

    tmpStr = Utils.getOption('W', options);
    if (tmpStr.length() > 0) {
      setClassname(tmpStr);
    } else {
      setClassname(this.getClass().getName());
    }
  }

  /**
   * Gets the current settings of this object.
   * 
   * @return an array of strings suitable for passing to setOptions
   */
  @Override
  public String[] getOptions() {
    Vector result;

    result = new Vector();

    result.add("-W");
    result.add(getClassname());

    return result.toArray(new String[result.size()]);
  }

  /**
   * sets the classname of the class to generate the Javadoc for
   * 
   * @param value the new classname
   */
  public void setClassname(String value) {
    m_Classname = value;
  }

  /**
   * returns the current classname
   * 
   * @return the current classname
   */
  public String getClassname() {
    return m_Classname;
  }

  /**
   * generates a string to print as help on the console
   * 
   * @return the generated help
   */
  public String generateHelp() {
    String result;
    Enumeration enm;
    Option option;

    result = getClass().getName().replaceAll(".*\\.", "") + " Options:\n\n";
    enm = listOptions();
    while (enm.hasMoreElements()) {
      option = enm.nextElement();
      result += option.synopsis() + "\n" + option.description() + "\n";
    }

    return result;
  }

  /**
   * generates the options string.
   * 
   * @return the options string
   * @throws Exception in case the generation fails
   */
  public String generate() throws Exception {
    StringBuffer result;
    OptionHandler handler;
    Enumeration enm;
    Option option;

    result = new StringBuffer();

    handler = (OptionHandler) Class.forName(getClassname()).newInstance();

    enm = handler.listOptions();
    while (enm.hasMoreElements()) {
      option = enm.nextElement();
      result.append(option.synopsis() + '\n');
      result.append(option.description() + "\n");
    }

    return result.toString();
  }

  /**
   * Returns the revision string.
   * 
   * @return the revision
   */
  @Override
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 10203 $");
  }

  /**
   * runs the javadoc producer with the given commandline options
   * 
   * @param options the commandline options
   */
  public static void main(String[] options) {
    ListOptions list = new ListOptions();

    try {
      try {
        if (Utils.getFlag('h', options)) {
          throw new Exception("Help requested");
        }

        list.setOptions(options);
        Utils.checkForRemainingOptions(options);
      } catch (Exception ex) {
        String result = "\n" + ex.getMessage() + "\n\n" + list.generateHelp();
        throw new Exception(result);
      }

      System.out.println("\n" + list.generate());
    } catch (Exception ex) {
      System.err.println(ex.getMessage());
    }
  }
}