source: java/ecj/cecj/fitness/SimpleSumFitness.java @ 1100

package cecj.fitness;

import java.util.Arrays;
import java.util.List;

import cecj.interaction.InteractionResult;

import ec.EvolutionState;
import ec.Individual;
import ec.simple.SimpleFitness;

public class SimpleSumFitness implements FitnessAggregateMethod {

        private float[] fitnesses;

        public void prepareToAggregate(EvolutionState state, int subpop) {
                fitnesses = new float[state.population.subpops[subpop].individuals.length];
                Arrays.fill(fitnesses, 0.0f);
        }

        public void addToAggregate(EvolutionState state, int subpop,
                        List<List<InteractionResult>> subpopulationResults, int weight) {

                Individual[] inds = state.population.subpops[subpop].individuals;
                if (subpopulationResults.size() != inds.length) {
                        throw new IllegalArgumentException(
                                "Results list's size must be equal to subpopulation size.");
                }

                for (int ind = 0; ind < inds.length; ind++) {
                        float fitness = 0;
                        for (InteractionResult result : subpopulationResults.get(ind)) {
                                fitness += result.getNumericValue();
                        }
                        fitnesses[ind] += fitness * weight;
                }
        }

        public void assignFitness(EvolutionState state, int subpop) {
                Individual[] inds = state.population.subpops[subpop].individuals;
                for (int ind = 0; ind < inds.length; ind++) {
                        ((SimpleFitness) inds[ind].fitness).setFitness(state, fitnesses[ind], false);
                }
        }
}