Merge branch 'release-0.11'

[jSite.git] / src / main / java / de / todesbaum / jsite / main / Version.java

diff --git a/src/main/java/de/todesbaum/jsite/main/Version.java b/src/main/java/de/todesbaum/jsite/main/Version.java
new file mode 100644 (file)
index 0000000..373703c
--- /dev/null
+++ b/src/main/java/de/todesbaum/jsite/main/Version.java
@@ -0,0 +1,114 @@
+/*
+ * jSite - Version.java - Copyright © 2006–2012 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package de.todesbaum.jsite.main;
+
+/**
+ * Container for version information.
+ *
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ */
+public class Version implements Comparable<Version> {
+
+       /** The components of the version information. */
+       private final int[] components;
+
+       /**
+        * Creates a new version container with the given components.
+        *
+        * @param components
+        *            The version components
+        */
+       public Version(int... components) {
+               this.components = new int[components.length];
+               System.arraycopy(components, 0, this.components, 0, components.length);
+       }
+
+       /**
+        * Returns the number of version components.
+        *
+        * @return The number of version components
+        */
+       public int size() {
+               return components.length;
+       }
+
+       /**
+        * Returns the version component with the given index.
+        *
+        * @param index
+        *            The index of the version component
+        * @return The version component
+        */
+       public int getComponent(int index) {
+               return components[index];
+       }
+
+       /**
+        * Parses a version from the given string.
+        *
+        * @param versionString
+        *            The version string to parse
+        * @return The parsed version, or <code>null</code> if the string could not
+        *         be parsed
+        */
+       public static Version parse(String versionString) {
+               String[] componentStrings = versionString.split("\\.");
+               int[] components = new int[componentStrings.length];
+               int index = -1;
+               for (String componentString : componentStrings) {
+                       try {
+                               components[++index] = Integer.parseInt(componentString);
+                       } catch (NumberFormatException nfe1) {
+                               return null;
+                       }
+               }
+               return new Version(components);
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public String toString() {
+               StringBuilder versionString = new StringBuilder();
+               for (int component : components) {
+                       if (versionString.length() != 0) {
+                               versionString.append('.');
+                       }
+                       versionString.append(component);
+               }
+               return versionString.toString();
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public int compareTo(Version version) {
+               int lessComponents = Math.min(components.length, version.components.length);
+               for (int index = 0; index < lessComponents; index++) {
+                       if (version.components[index] == components[index]) {
+                               continue;
+                       }
+                       return components[index] - version.components[index];
+               }
+               return components.length - version.components.length;
+       }
+
+}