public static File getIndexFile(String filename) {
        String tmpDir = System.getProperty("java.io.tmpdir");
        File f = new File(filename);
        File indexFile = new File(tmpDir, f.getName() + "_cdk.index");
        f = null;
        return indexFile;
    }
public static File getIndexFile ( String filename ) { String tmpDir = System . getProperty ( "java.io.tmpdir" ) ; File f = new File ( filename ) ; File indexFile = new File ( tmpDir , f . getName ( ) + "_cdk.index" ) ; f = null ; return indexFile ; }
Opens the file index file <code>_cdk.index</code> in a temporary folder, as specified by "java.io.tmpdir" property.

@param filename the name of the file for which the index was generated
@return a file object representing the index file