com.liferay.document.library.kernel.util.comparator.VersionNumberComparator Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library 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 2.1 of the License, or (at your option)
* any later version.
*
* This library 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.
*/
package com.liferay.document.library.kernel.util.comparator;
import com.liferay.document.library.kernel.model.DLFileEntryConstants;
import com.liferay.petra.string.StringPool;
import com.liferay.portal.kernel.util.StringUtil;
import java.util.Comparator;
/**
* @author Iván Zaera
*/
public class VersionNumberComparator implements Comparator {
public VersionNumberComparator() {
this(false);
}
public VersionNumberComparator(boolean ascending) {
_ascending = ascending;
}
@Override
public int compare(String version1, String version2) {
if (version1.equals(
DLFileEntryConstants.PRIVATE_WORKING_COPY_VERSION)) {
return -1;
}
if (version2.equals(
DLFileEntryConstants.PRIVATE_WORKING_COPY_VERSION)) {
return 1;
}
int value = 0;
int[] versionParts1 = StringUtil.split(version1, StringPool.PERIOD, 0);
int[] versionParts2 = StringUtil.split(version2, StringPool.PERIOD, 0);
if ((versionParts1.length != 2) && (versionParts2.length != 2)) {
value = 0;
}
else if (versionParts1.length != 2) {
value = -1;
}
else if (versionParts2.length != 2) {
value = 1;
}
else if (versionParts1[0] > versionParts2[0]) {
value = 1;
}
else if (versionParts1[0] < versionParts2[0]) {
value = -1;
}
else if (versionParts1[1] > versionParts2[1]) {
value = 1;
}
else if (versionParts1[1] < versionParts2[1]) {
value = -1;
}
if (_ascending) {
return value;
}
return -value;
}
public boolean isAscending() {
return _ascending;
}
private final boolean _ascending;
}