Merge branch 'master' of feistymeow.org:feisty_meow

[feisty_meow.git] / kona / src / org / gffs / version / VersionManager.java

diff --git a/kona/src/org/gffs/version/VersionManager.java b/kona/src/org/gffs/version/VersionManager.java
new file mode 100644 (file)
index 0000000..16d9b50
--- /dev/null
+++ b/kona/src/org/gffs/version/VersionManager.java
@@ -0,0 +1,41 @@
+package org.gffs.version;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.gffs.application.ProgramTools;
+
+public class VersionManager
+{
+       static private final String VERSION_FILENAME = "current.version";
+
+       private Version _currentVersion;
+       private File _versionFile;
+
+       public VersionManager()
+       {
+               _versionFile = new File(ProgramTools.getInstallationDirectory(), VERSION_FILENAME);
+               _currentVersion = null;
+       }
+
+       public Version getCurrentVersion() throws IOException
+       {
+               if (_currentVersion == null) {
+                       // we go with the installer scheme to start with, where there's a current.version in the
+                       // top-level.
+                       if (!_versionFile.exists()) {
+                               // try failing over to the source code's version of the file inside the installer
+                               // directory.
+                               _versionFile = new File(ProgramTools.getInstallationDirectory(), "installer/" + VERSION_FILENAME);
+                               if (!_versionFile.exists()) {
+                                       _currentVersion = Version.EMPTY_VERSION;
+                               }
+                       }
+                       if (_versionFile.exists()) {
+                               _currentVersion = new Version(_versionFile);
+                       }
+               }
+
+               return _currentVersion;
+       }
+}