Implement isAutoAging to deactivate auto-aging of individuals on incrGeneration.

Used by various instances of the ABC

src/eva2/optimization/population/Population.java

@@ -99,6 +99,12 @@ public class Population extends ArrayList<AbstractEAIndividual> implements Popul
     public static final String POPULATION_INITIALIZED = "PopulationReinitOccured";
     public static final String NEXT_GENERATION_PERFORMED = "NextGenerationPerformed";
 
+    /**
+     * With <code>autoAging = true</code> #incrGeneration automatically
+     * ages individuals.
+     */
+    private boolean autoAging = true;
+
     public Population() {
         LOGGER.log(Level.FINER, "New population has been created.");
     }
@@ -575,6 +581,15 @@ public class Population extends ArrayList<AbstractEAIndividual> implements Popul
         return historyMaxLen != 0;
     }
 
+    @Hidden
+    public void setAutoAging(boolean autoAging) {
+        this.autoAging = autoAging;
+    }
+
+    public boolean isAutoAging() {
+        return this.autoAging;
+    }
+
     public void setMaxHistoryLength(int len) {
         historyMaxLen = len;
     }
@@ -711,8 +726,10 @@ public class Population extends ArrayList<AbstractEAIndividual> implements Popul
             }
             this.historyList.add((AbstractEAIndividual) this.getBestEAIndividual().clone());
         }
-        for (AbstractEAIndividual individual : this) {
+        if (isAutoAging()) {
-            individual.incrAge();
+            for (AbstractEAIndividual individual : this) {
+                individual.incrAge();
+            }
         }
         this.generationCount++;
         firePropertyChangedEvent(NEXT_GENERATION_PERFORMED);

src/eva2/optimization/strategies/ArtificialBeeColony.java

@@ -65,6 +65,8 @@ public class ArtificialBeeColony extends AbstractOptimizer implements Serializab
     @Override
     public void initializeByPopulation(Population pop, boolean reset) {
         this.population = (Population) pop.clone();
+        // We handle aging ourselves
+        this.population.setAutoAging(false);
         if (reset) {
             this.population.initialize();
             this.evaluatePopulation(this.population);
@@ -111,31 +113,25 @@ public class ArtificialBeeColony extends AbstractOptimizer implements Serializab
         /**
          * Remember best Individual
          */
-        if (bestIndividual != null && bestIndividual.getFitness(0) < this.population.getBestEAIndividual().getFitness(0)) {
+        memorizeBestSolution();
-            bestIndividual = this.population.getBestEAIndividual();
-        } else {
-            bestIndividual = this.population.getBestEAIndividual();
-        }
 
         /**
          * Send scout bee
          */
         sendScoutBees();
 
-        /**
-         * ToDo: This is ugly.
-         *
-         * incrGeneration increments the age of all indies. Age management however happens
-         * in the algorithm itself (for ABC) so we have to -1 all ages.
-         */
         this.population.incrGeneration();
-        for (AbstractEAIndividual individual : this.population) {
-            individual.setAge(individual.getAge() - 1);
-        }
-
         this.firePropertyChangedEvent(Population.NEXT_GENERATION_PERFORMED);
     }
 
+    protected void memorizeBestSolution() {
+        if (bestIndividual != null && bestIndividual.getFitness(0) < this.population.getBestEAIndividual().getFitness(0)) {
+            bestIndividual = this.population.getBestEAIndividual();
+        } else {
+            bestIndividual = this.population.getBestEAIndividual();
+        }
+    }
+
     protected void sendScoutBees() {
         AbstractEAIndividual oldestIndy = getOldestIndividual();
         if (oldestIndy.getAge() > this.maxTrials) {
@@ -228,7 +224,7 @@ public class ArtificialBeeColony extends AbstractOptimizer implements Serializab
     }
 
     /**
-     * In the standard ABC the onlookers behave exaclty like the employed bees.
+     * In the standard ABC the onlookers behave exactly like the employed bees.
      *
      * @param baseIndividual
      * @param index