question: private static Version readWorkspaceVersion ( final URL workspace ) { final File versionFile = getVersionFile ( workspace , false ) ; if ( versionFile == null || ! versionFile . exists ( ) ) { return null ; } try { final Properties props = new Properties ( ) ; final FileInputStream is = new FileInputStream ( versionFile ) ; try { props . load ( is ) ; } finally { is . close ( ) ; } String versionString = props . getProperty ( WORKSPACE_CHECK_REFERENCE_BUNDLE_NAME ) ; if ( versionString != null ) { return Version . parseVersion ( versionString ) ; } versionString = props . getProperty ( WORKSPACE_CHECK_REFERENCE_BUNDLE_NAME_LEGACY ) ; if ( versionString != null ) { return Version . parseVersion ( versionString ) ; } return null ; } catch ( final IOException e ) { IDEWorkbenchPlugin . log ( "Could not read version file " + versionFile , new Status ( IStatus . ERROR , IDEWorkbenchPlugin . IDE_WORKBENCH , IStatus . ERROR , e . getMessage ( ) == null ? "" : e . getMessage ( ) , e ) ) ; return null ; } catch ( final IllegalArgumentException e ) { IDEWorkbenchPlugin . log ( "Could not parse version in " + versionFile , new Status ( IStatus . ERROR , IDEWorkbenchPlugin . IDE_WORKBENCH , IStatus . ERROR , e . getMessage ( ) == null ? "" : e . getMessage ( ) , e ) ) ; return null ; } }
target:  Look at the argument URL for the workspace's version information. Return that version if found and null otherwise.