source: trunk/quest-ui-core/src/main/java/de/ugoe/cs/quest/ui/commands/CMDcalcEntropy.java @ 664

package de.ugoe.cs.quest.ui.commands;

import java.security.InvalidParameterException;
import java.util.List;

import de.ugoe.cs.quest.CommandHelpers;
import de.ugoe.cs.quest.ui.GlobalDataContainer;
import de.ugoe.cs.quest.usageprofiles.FirstOrderMarkovModel;
import de.ugoe.cs.util.console.Command;
import de.ugoe.cs.util.console.Console;

/**
 * <p>
 * Command to calculate the entropy of first-order Markov models.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class CMDcalcEntropy implements Command {

        /*
         * (non-Javadoc)
         * 
         * @see de.ugoe.cs.util.console.Command#help()
         */
        @Override
        public String help() {
                return "calcEntropy <modelname>";
        }

        /*
         * (non-Javadoc)
         * 
         * @see de.ugoe.cs.util.console.Command#run(java.util.List)
         */
        @Override
        public void run(List<Object> parameters) {
                String modelname = "";
                try {
                        modelname = (String) parameters.get(0);
                } catch (Exception e) {
                        throw new InvalidParameterException();
                }

                FirstOrderMarkovModel model = null;
                Object dataObject = GlobalDataContainer.getInstance()
                                .getData(modelname);
                if (dataObject == null) {
                        CommandHelpers.objectNotFoundMessage(modelname);
                        return;
                }
                if (!(dataObject instanceof FirstOrderMarkovModel)) {
                        CommandHelpers.objectNotType(modelname, "FirstOrderMarkovModel");
                        return;
                }
                model = (FirstOrderMarkovModel) dataObject;
                double entropy = model.calcEntropy();
                if (!Double.isNaN(entropy)) {
                        Console.println("entropy: " + entropy);
                }
        }

}