VersionManager.java

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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;
  }
}