kona/src/org/gffs/version/VersionManager.java

   1 package org.gffs.version;
   2
   3 import java.io.File;
   4 import java.io.IOException;
   5
   6 import org.gffs.application.ProgramTools;
   7
   8 public class VersionManager
   9 {
  10         static private final String VERSION_FILENAME = "current.version";
  11
  12         private Version _currentVersion;
  13         private File _versionFile;
  14
  15         public VersionManager()
  16         {
  17                 _versionFile = new File(ProgramTools.getInstallationDirectory(), VERSION_FILENAME);
  18                 _currentVersion = null;
  19         }
  20
  21         public Version getCurrentVersion() throws IOException
  22         {
  23                 if (_currentVersion == null) {
  24                         // we go with the installer scheme to start with, where there's a current.version in the
  25                         // top-level.
  26                         if (!_versionFile.exists()) {
  27                                 // try failing over to the source code's version of the file inside the installer
  28                                 // directory.
  29                                 _versionFile = new File(ProgramTools.getInstallationDirectory(), "installer/" + VERSION_FILENAME);
  30                                 if (!_versionFile.exists()) {
  31                                         _currentVersion = Version.EMPTY_VERSION;
  32                                 }
  33                         }
  34                         if (_versionFile.exists()) {
  35                                 _currentVersion = new Version(_versionFile);
  36                         }
  37                 }
  38
  39                 return _currentVersion;
  40         }
  41 }