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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.duplications.detector;
import java.util.Comparator;
import org.sonar.duplications.index.ClonePart;
import org.sonar.duplications.utils.FastStringComparator;
/**
* Allows to determine if ClonePart includes another ClonePart.
* Inclusion is the partial order, so in fact this class violates contracts of {@link Comparator},
* however it allows to use {@link org.sonar.duplications.utils.SortedListsUtils} for efficient filtering.
*/
public final class ContainsInComparator implements Comparator<ClonePart> {
/**
* Defines order by resourceId.
*/
public static final Comparator<ClonePart> RESOURCE_ID_COMPARATOR = (o1, o2) -> FastStringComparator.INSTANCE.compare(o1.getResourceId(), o2.getResourceId());
/**
* Defines order by resourceId and by unitStart.
*/
public static final Comparator<ClonePart> CLONEPART_COMPARATOR = (o1, o2) -> {
int c = RESOURCE_ID_COMPARATOR.compare(o1, o2);
if (c == 0) {
return o1.getUnitStart() - o2.getUnitStart();
}
return c;
};
private final int l1;
private final int l2;
/**
* Constructs new comparator for two parts with lengths {@code l1} and {@code l2} respectively.
*/
public ContainsInComparator(int l1, int l2) {
this.l1 = l1;
this.l2 = l2;
}
/**
* Compares two parts on inclusion.
* part1 includes part2 if {@code (part1.resourceId == part2.resourceId) && (part1.unitStart <= part2.unitStart) && (part2.unitEnd <= part1.unitEnd)}.
*
* @return 0 if part1 includes part2,
* 1 if resourceId of part1 is greater than resourceId of part2 or if unitStart of part1 is greater than unitStart of part2,
* -1 in all other cases
*/
@Override
public int compare(ClonePart part1, ClonePart part2) {
int c = RESOURCE_ID_COMPARATOR.compare(part1, part2);
if (c == 0) {
if (part1.getUnitStart() <= part2.getUnitStart()) {
if (part2.getUnitStart() + l2 <= part1.getUnitStart() + l1) {
// part1 contains part2
return 0;
} else {
// SortedListsUtils#contains should continue search
return -1;
}
} else {
// unitStart of part1 is less than unitStart of part2 - SortedListsUtils#contains should stop search
return 1;
}
} else {
return c;
}
}
}
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