praktikum-holons/src/algorithm/binary/GreedyAlgorithm.java

package algorithm.binary;

import java.util.ArrayList;
import java.util.List;

import api.AlgorithmFrameworkFlex;
import utility.StringFormat;

public class GreedyAlgorithm extends AlgorithmFrameworkFlex{

	private int problemSize = 0;
	private boolean moreInformation = true;
	@Override
	protected Individual executeAlgo() {
		Individual best = new Individual();
		best.position = extractPositionAndAccess();
		println("Bit-Array_length: " + best.position.size());
		best.fitness = evaluatePosition(best.position);
		List<Double> runList = new ArrayList<Double>();
		runList.add(best.fitness);
		println("Start with: " + StringFormat.doubleFixedPlaces(2, best.fitness));
		problemSize = best.position.size();
		
		
		List<Integer> indexList = new ArrayList<Integer>();
		for(int index = 0; index < problemSize; index++)
		{
			indexList.add(index);
		}
		
		
		Individual bestAfterRound = new Individual(best);
		for(int round = 0; round < problemSize; round++)
		{
			Individual startInThisRound = new Individual(bestAfterRound);
			Individual bestInThisRound = new Individual(); 
			int indexToRemove = -1;
			bestInThisRound.fitness = Float.MAX_VALUE;
			for(Integer i : indexList) {
				boolean actualValue = startInThisRound.position.get(i);
				startInThisRound.position.set(i, !actualValue);
				double fitness = evaluatePosition(startInThisRound.position);
				if(fitness < bestInThisRound.fitness) {
					bestInThisRound = new Individual(startInThisRound);	
					bestInThisRound.fitness = fitness;
					indexToRemove = i;
				}
				startInThisRound.position.set(i, actualValue);
			}
			if(cancel) return null;
			bestAfterRound = bestInThisRound;
			println("Fitness: " + bestInThisRound.fitness + "FlippedIndex = " + indexToRemove + "(" +indexList.size() + ")");
			if(bestAfterRound.fitness < best.fitness) {
				best = bestAfterRound;
			}
			indexList.remove(Integer.valueOf(indexToRemove));
		}
		
		return best;
	}

	
	
	protected void println(String value) {
		if(moreInformation)console.println(value);
	}
	
	@Override
	protected int getProgressBarMaxCount() {
		return (problemSize * (problemSize + 1)) / 2;
	}

	@Override
	protected String algoInformationToPrint() {
		return "NoParameter";
	}

	@Override
	protected String plottFileName() {
		return "plottGreedy.txt";
	}
}