/
SelectedCountLimitMoveSelector.java
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/
SelectedCountLimitMoveSelector.java
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/*
* Copyright 2014 JBoss Inc
*
* 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.move.decorator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.optaplanner.core.impl.heuristic.selector.common.iterator.SelectionIterator;
import org.optaplanner.core.impl.heuristic.selector.move.AbstractMoveSelector;
import org.optaplanner.core.impl.heuristic.selector.move.MoveSelector;
import org.optaplanner.core.impl.move.Move;
public class SelectedCountLimitMoveSelector extends AbstractMoveSelector {
protected final MoveSelector childMoveSelector;
protected final long selectedCountLimit;
public SelectedCountLimitMoveSelector(MoveSelector childMoveSelector, long selectedCountLimit) {
this.childMoveSelector = childMoveSelector;
this.selectedCountLimit = selectedCountLimit;
if (selectedCountLimit < 0L) {
throw new IllegalArgumentException("The selector (" + this
+ ") has a negative selectedCountLimit (" + selectedCountLimit + ").");
}
solverPhaseLifecycleSupport.addEventListener(childMoveSelector);
}
// ************************************************************************
// Worker methods
// ************************************************************************
public boolean isCountable() {
return true;
}
public boolean isNeverEnding() {
return false;
}
public long getSize() {
long childSize = childMoveSelector.getSize();
return Math.min(selectedCountLimit, childSize);
}
public Iterator<Move> iterator() {
return new SelectedCountLimitMoveIterator(childMoveSelector.iterator());
}
private class SelectedCountLimitMoveIterator extends SelectionIterator<Move> {
private final Iterator<Move> childMoveIterator;
private long selectedSize;
public SelectedCountLimitMoveIterator(Iterator<Move> childMoveIterator) {
this.childMoveIterator = childMoveIterator;
selectedSize = 0L;
}
@Override
public boolean hasNext() {
return selectedSize < selectedCountLimit && childMoveIterator.hasNext();
}
@Override
public Move next() {
if (selectedSize >= selectedCountLimit) {
throw new NoSuchElementException();
}
selectedSize++;
return childMoveIterator.next();
}
}
@Override
public String toString() {
return "SelectedCountLimit(" + childMoveSelector + ")";
}
}