Add VersionComparator necessary for update checking

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-over/trunk@508 174cde9d-5d70-4d2a-aa98-46368bc2aaf7

1 files changed, 101 insertions, 0 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/VersionComparator.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/VersionComparator.java
new file mode 100644
index 00000000..1437a4a3
--- /dev/null
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/VersionComparator.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui.utils;
+
+// Imports
+import java.util.Comparator;
+
+/**
+ * 
+ */
+public class VersionComparator implements Comparator<String> {
+	/* (non-Javadoc)
+	 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
+	 */
+	@Override
+	public int compare(String v1, String v2) {
+		String[] v1Parts = v1.split("\\.|-"); //$NON-NLS-1$
+		String[] v2Parts = v2.split("\\.|-"); //$NON-NLS-1$
+
+		int length = Math.max(v1Parts.length, v2Parts.length);
+		for (int i = 0; i < length; ++i) {
+			int v1Part = 0;
+			try {
+				if (i < v1Parts.length)
+					v1Part = Integer.parseInt(v1Parts[i]);
+			} catch (NumberFormatException e) {
+				if (v1Parts[i].equals("SNAPSHOT")) //$NON-NLS-1$
+					v1Part = Integer.MAX_VALUE;
+			}
+
+			int v2Part = 0;
+			try {
+				if (i < v2Parts.length)
+					v2Part = Integer.parseInt(v2Parts[i]);
+			} catch (NumberFormatException e) {
+				if (v2Parts[i].equals("SNAPSHOT")) //$NON-NLS-1$
+					v2Part = Integer.MAX_VALUE;
+			}
+
+			if (v1Part < v2Part)
+				return -1;
+			if (v1Part > v2Part)
+				return 1;
+		}
+		return 0;
+	}
+
+	/**
+	 * Compare two version strings (static version)
+	 * @param v1 version 1
+	 * @param v2 version 2
+	 * @return -1 if v1 < v2, 0 if v1 = v2, 1 if v1 > v2
+	 */
+	public static int compare_s(String v1, String v2) {
+		VersionComparator vc = new VersionComparator();
+		return vc.compare(v1, v2);
+	}
+
+	/**
+	 * Check two version strings for equality
+	 * @param v1 version 1
+	 * @param v2 version 2
+	 * @return v1 == v2
+	 */
+	public static boolean equals(String v1, String v2) {
+		return compare_s(v1, v2) == 0;
+	}
+
+	/**
+	 * Check two version strings for order
+	 * @param v1 version 1
+	 * @param v2 version 2
+	 * @return v1 < v2
+	 */
+	public static boolean before(String v1, String v2) {
+		return compare_s(v1, v2) < 0;
+	}
+
+	/**
+	 * Check two version strings for order
+	 * @param v1 version 1
+	 * @param v2 version 2
+	 * @return v1 > v2
+	 */
+	public static boolean after(String v1, String v2) {
+		return compare_s(v1, v2) > 0;
+	}
+}