ElitismReplacementStrategyHandler.java
package net.bmahe.genetics4j.core.replacement;
import org.apache.commons.lang3.Validate;
import net.bmahe.genetics4j.core.selection.SelectionPolicyHandler;
import net.bmahe.genetics4j.core.selection.SelectionPolicyHandlerResolver;
import net.bmahe.genetics4j.core.selection.Selector;
import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
import net.bmahe.genetics4j.core.spec.AbstractEAExecutionContext;
import net.bmahe.genetics4j.core.spec.replacement.Elitism;
import net.bmahe.genetics4j.core.spec.replacement.ReplacementStrategy;
import net.bmahe.genetics4j.core.spec.selection.SelectionPolicy;
public class ElitismReplacementStrategyHandler<T extends Comparable<T>> implements ReplacementStrategyHandler<T> {
@Override
public boolean canHandle(final ReplacementStrategy replacementStrategy) {
Validate.notNull(replacementStrategy);
return replacementStrategy instanceof Elitism;
}
@Override
public ReplacementStrategyImplementor<T> resolve(final AbstractEAExecutionContext<T> eaExecutionContext,
final AbstractEAConfiguration<T> eaConfiguration,
final SelectionPolicyHandlerResolver<T> selectionPolicyHandlerResolver,
final ReplacementStrategy replacementStrategy) {
Validate.notNull(eaExecutionContext);
Validate.notNull(eaConfiguration);
Validate.notNull(selectionPolicyHandlerResolver);
Validate.notNull(replacementStrategy);
Validate.isInstanceOf(Elitism.class, replacementStrategy);
final Elitism elitism = (Elitism) replacementStrategy;
final SelectionPolicy offspringSelectionPolicy = elitism.offspringSelectionPolicy();
final SelectionPolicyHandler<T> offspringSelectionPolicyHandler = selectionPolicyHandlerResolver
.resolve(offspringSelectionPolicy);
final Selector<T> offspringSelector = offspringSelectionPolicyHandler
.resolve(eaExecutionContext, eaConfiguration, selectionPolicyHandlerResolver, offspringSelectionPolicy);
final SelectionPolicy survivorSelectionPolicy = elitism.survivorSelectionPolicy();
final SelectionPolicyHandler<T> survivorSelectionPolicyHandler = selectionPolicyHandlerResolver
.resolve(survivorSelectionPolicy);
final Selector<T> survivorSelector = survivorSelectionPolicyHandler
.resolve(eaExecutionContext, eaConfiguration, selectionPolicyHandlerResolver, survivorSelectionPolicy);
return new ElitismImpl<T>(elitism, offspringSelector, survivorSelector);
}
}