source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/commands/CMDgenerateHybrid.java @ 344

package de.ugoe.cs.eventbench.commands;

import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;

import de.ugoe.cs.eventbench.CommandHelpers;
import de.ugoe.cs.eventbench.data.Event;
import de.ugoe.cs.eventbench.data.GlobalDataContainer;
import de.ugoe.cs.eventbench.models.IStochasticProcess;
import de.ugoe.cs.util.console.Command;
import de.ugoe.cs.util.console.Console;

/**
 * <p>
 * Command to generate sequences of a given length.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class CMDgenerateHybrid implements Command {

        /*
         * (non-Javadoc)
         * 
         * @see de.ugoe.cs.util.console.Command#run(java.util.List)
         */
        @Override
        public void run(List<Object> parameters) {
                String modelname;
                String sequencesName;
                int length;
                int maxLengthall;
                int numSequences;
                int maxIterOuter = 100;
                int maxIterInner = 1000;
                try {
                        modelname = (String) parameters.get(0);
                        sequencesName = (String) parameters.get(1);
                        length = Integer.parseInt((String) parameters.get(2));
                        maxLengthall = Integer.parseInt((String) parameters.get(3));
                        numSequences = Integer.parseInt((String) parameters.get(4));
                } catch (Exception e) {
                        throw new InvalidParameterException();
                }

                IStochasticProcess model = null;
                Object dataObject = GlobalDataContainer.getInstance()
                                .getData(modelname);
                if (dataObject == null) {
                        CommandHelpers.objectNotFoundMessage(modelname);
                        return;
                } else if (!(dataObject instanceof IStochasticProcess)) {
                        CommandHelpers.objectNotType(modelname, "IStochasticProcess");
                        return;
                }
                model = (IStochasticProcess) dataObject;
                Collection<List<? extends Event<?>>> sequences = new LinkedHashSet<List<? extends Event<?>>>();
                
                List<List<? extends Event<?>>> seqsTmp = new ArrayList<List<? extends Event<?>>>(model.generateSequences(maxLengthall+1, true));
                
                Console.traceln("" + seqsTmp.size() + " of length " + maxLengthall + " possible");
                List<Double> probabilities = new ArrayList<Double>(seqsTmp.size());
                double probSum = 0.0;
                for (List<? extends Event<?>> sequence : seqsTmp) {
                        double prob = model.getProbability(sequence);
                        probabilities.add(prob);
                        probSum += prob;
                }
                
                Random r = new Random();
                int j=0;
                while (sequences.size() < numSequences && j<=maxIterOuter) {
                        j++;
                        double randVal = r.nextDouble() * probSum;
                        double sum = 0.0d;
                        int index = -1;
                        while (sum < randVal) {
                                index++;
                                double currentProb = probabilities.get(index);
                                sum += currentProb;
                        }
                        List<? extends Event<?>> seqTmp = seqsTmp.get(index);
                        if( seqTmp.get(seqTmp.size()-1)!=Event.ENDEVENT ) {
                                for( int i=0 ; i<maxIterInner ; i++ ) {
                                        List<? extends Event<?>> sequence = finishSequence(seqTmp, model);
                                        if( sequence.size() == length+2 ) {
                                                j=0;
                                                sequences.add(sequence);
                                                break;
                                        }
                                }
                        }
                }
                if (GlobalDataContainer.getInstance().addData(sequencesName, sequences)) {
                        CommandHelpers.dataOverwritten(sequencesName);
                }
                Console.println("" + sequences.size() + " sequences generated");
        }
        
        public List<? extends Event<?>> finishSequence(List<? extends Event<?>> sequence, IStochasticProcess model) {
                Random r = new Random();
                List<Event<?>> sequenceCopy =  new LinkedList<Event<?>>(sequence);

                boolean endFound = false;

                while (!endFound) {
                        double randVal = r.nextDouble();
                        double probSum = 0.0;
                        for (Event<?> symbol : model.getEvents()) {
                                probSum += model.getProbability(sequenceCopy, symbol);
                                if (probSum >= randVal) {
                                        endFound = (symbol == Event.ENDEVENT);
                                        if (!(symbol == Event.STARTEVENT )) {
                                                // only add the symbol the sequence if it is not START
                                                // or END
                                                sequenceCopy.add(symbol);
                                        }
                                        break;
                                }
                        }
                }
                return sequenceCopy;
        }

        /*
         * (non-Javadoc)
         * 
         * @see de.ugoe.cs.util.console.Command#help()
         */
        @Override
        public void help() {
                Console.println("Usage: generateFixedLengthSequences <modelname> <sequencesName> <lenght> <maxlengthAll> <numSequences>");
        }

}