/*
* Copyright 2014 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.optaplanner.core.impl.heuristic.selector.value.decorator;
import java.util.Collections;
import java.util.Iterator;
import org.optaplanner.core.impl.domain.variable.descriptor.GenuineVariableDescriptor;
import org.optaplanner.core.impl.heuristic.selector.value.AbstractValueSelector;
import org.optaplanner.core.impl.heuristic.selector.value.ValueSelector;
public class DowncastingValueSelector extends AbstractValueSelector {
protected final ValueSelector childValueSelector;
protected final Class<?> downcastEntityClass;
public DowncastingValueSelector(ValueSelector childValueSelector, Class<?> downcastEntityClass) {
this.childValueSelector = childValueSelector;
this.downcastEntityClass = downcastEntityClass;
phaseLifecycleSupport.addEventListener(childValueSelector);
}
public ValueSelector getChildValueSelector() {
return childValueSelector;
}
// ************************************************************************
// Worker methods
// ************************************************************************
@Override
public GenuineVariableDescriptor getVariableDescriptor() {
return childValueSelector.getVariableDescriptor();
}
@Override
public boolean isCountable() {
return childValueSelector.isCountable();
}
@Override
public boolean isNeverEnding() {
return childValueSelector.isNeverEnding();
}
@Override
public long getSize(Object entity) {
if (!downcastEntityClass.isInstance(entity)) {
return 0L;
}
return childValueSelector.getSize(entity);
}
@Override
public Iterator<Object> iterator(Object entity) {
if (!downcastEntityClass.isInstance(entity)) {
return Collections.emptyIterator();
}
return childValueSelector.iterator(entity);
}
@Override
public Iterator<Object> endingIterator(Object entity) {
if (!downcastEntityClass.isInstance(entity)) {
return Collections.emptyIterator();
}
return childValueSelector.endingIterator(entity);
}
@Override
public String toString() {
return "Downcasting(" + childValueSelector + ")";
}
}