MOAUtils.java

/*
 *    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 2 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, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * MOAUtils.java
 * Copyright (C) 2009 University of Waikato, Hamilton, New Zealand
 */

package weka.core;

import tr.gov.ulakbim.jDenetX.MOAObject;
import tr.gov.ulakbim.jDenetX.options.AbstractOptionHandler;
import tr.gov.ulakbim.jDenetX.options.ClassOption;

/**
 * A helper class for MOA related classes.
 *
 * @author fracpete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 7 $
 */
public class MOAUtils {

    /**
     * Turns a commandline into an object (classname + optional options).
     *
     * @param option      the corresponding class option
     * @param commandline the commandline to turn into an object
     * @return the generated oblect
     */
    public static MOAObject fromCommandLine(ClassOption option, String commandline) {
        return fromCommandLine(option.getRequiredType(), commandline);
    }

    /**
     * Turns a commandline into an object (classname + optional options).
     *
     * @param requiredType the required class
     * @param commandline  the commandline to turn into an object
     * @return the generated oblect
     */
    public static MOAObject fromCommandLine(Class requiredType, String commandline) {
        MOAObject result;
        String[] tmpOptions;
        String classname;

        try {
            tmpOptions = Utils.splitOptions(commandline);
            classname = tmpOptions[0];
            tmpOptions[0] = "";
            try {
                result = (MOAObject) Class.forName(classname).newInstance();
            }
            catch (Exception e) {
                // try to prepend package name
                result = (MOAObject) Class.forName(requiredType.getPackage().getName() + "." + classname).newInstance();
            }
            if (result instanceof AbstractOptionHandler) {
                ((AbstractOptionHandler) result).getOptions().setViaCLIString(Utils.joinOptions(tmpOptions));
                ((AbstractOptionHandler) result).prepareForUse();
            }
        }
        catch (Exception e) {
            e.printStackTrace();
            result = null;
        }

        return result;
    }

    /**
     * Creates a MOA object from the specified class option.
     *
     * @param option the option to build the object from
     * @return the created object
     */
    public static MOAObject fromOption(ClassOption option) {
        return MOAUtils.fromCommandLine(option.getRequiredType(), option.getValueAsCLIString());
    }

    /**
     * Returs the commandline for the given object. If the object is not
     * derived from AbstractOptionHandler, then only the classname. Otherwise
     * the classname and the options are returned.
     *
     * @param obj the object to generate the commandline for
     * @return the commandline
     */
    public static String toCommandLine(MOAObject obj) {
        String result = obj.getClass().getName();
        if (obj instanceof AbstractOptionHandler)
            result += " " + ((AbstractOptionHandler) obj).getOptions().getAsCLIString();
        return result.trim();
    }
}