NodeComparator.java
/*******************************************************************************
* Copyright (c) 2009, 2024 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.analysis;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.jacoco.core.analysis.ICoverageNode.CounterEntity;
/**
* Comparator to compare {@link ICoverageNode} objects by different counter
* criteria.
*
* @see CounterComparator#on(ICoverageNode.CounterEntity)
*/
public class NodeComparator implements Comparator<ICoverageNode>, Serializable {
private static final long serialVersionUID = 8550521643608826519L;
/**
* Comparator to compare {@link ICounter} objects.
*/
private final Comparator<ICounter> counterComparator;
/**
* Counter entity to sort on.
*/
private final CounterEntity entity;
NodeComparator(final Comparator<ICounter> counterComparator,
final CounterEntity entity) {
this.counterComparator = counterComparator;
this.entity = entity;
}
/**
* Creates a new composite comparator with a second search criterion.
*
* @param second
* second criterion comparator
*
* @return composite comparator
*/
public NodeComparator second(final Comparator<ICoverageNode> second) {
final Comparator<ICoverageNode> first = this;
return new NodeComparator(null, null) {
private static final long serialVersionUID = -5515272752138802838L;
@Override
public int compare(final ICoverageNode o1, final ICoverageNode o2) {
final int result = first.compare(o1, o2);
return result == 0 ? second.compare(o1, o2) : result;
}
};
}
/**
* Returns a sorted copy of the given collection of {@link ICoverageNode}
* elements.
*
* @param <T>
* actual type of the elements
* @param summaries
* collection to create a copy of
* @return sorted copy
*/
public <T extends ICoverageNode> List<T> sort(
final Collection<T> summaries) {
final List<T> result = new ArrayList<T>(summaries);
Collections.sort(result, this);
return result;
}
public int compare(final ICoverageNode n1, final ICoverageNode n2) {
final ICounter c1 = n1.getCounter(entity);
final ICounter c2 = n2.getCounter(entity);
return counterComparator.compare(c1, c2);
}
}