| /******************************************************************************* |
| * Copyright (c) 2010-2014 SAP AG and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * SAP AG - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.skalli.model.ext.maven; |
| |
| import java.util.Comparator; |
| |
| import org.apache.commons.lang.StringUtils; |
| |
| /** |
| * A "simplified" comparator for Maven versions. |
| * |
| * The version string is split at '.' and '-' characters. |
| * Parts that are numbers are compared numerically. All other parts are compared like strings. |
| */ |
| class MavenVersionsComparator implements Comparator<String> { |
| |
| enum SortOrder { |
| ASCENDING, |
| DESCENDING |
| } |
| |
| private SortOrder order = SortOrder.ASCENDING; |
| |
| public MavenVersionsComparator() { |
| this(SortOrder.ASCENDING); |
| } |
| |
| public MavenVersionsComparator(SortOrder order) { |
| this.order = order; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) |
| */ |
| @Override |
| public int compare(String version1, String version2) { |
| if (SortOrder.DESCENDING.equals(this.order)) { |
| return -1 * compareLatestAsLowest(version1, version2); |
| } else { |
| return compareLatestAsLowest(version1, version2); |
| } |
| }; |
| |
| public int compareLatestAsLowest(String version1, String version2) { |
| if (version1.equals(version2)) { |
| return 0; |
| } |
| |
| String[] v1Parts = StringUtils.split(version1, ".-"); |
| String[] v2Parts = StringUtils.split(version2, ".-"); |
| |
| int minLength = Math.min(v1Parts.length, v2Parts.length); |
| |
| for (int i = 0; i < minLength; i++) { |
| String str1 = v1Parts[i]; |
| String str2 = v2Parts[i]; |
| try { |
| int val1 = Integer.valueOf(str1); |
| int val2 = Integer.valueOf(str2); |
| int result = val1 < val2 ? -1 : ((val1 == val2) ? 0 : +1); |
| if (result != 0) { |
| return result; |
| } |
| } catch (NumberFormatException e) { |
| int result = str1.compareTo(str2); |
| if (result != 0) { |
| return result; |
| } |
| } |
| } |
| |
| if (version1.length() == version2.length()) { |
| return 0; |
| } else if (version1.length() < version2.length()) { |
| return -1; |
| } else { |
| return +1; |
| } |
| |
| } |
| } |