public void addIncludeFiles(FileMatch include){
  if (include == null)   throw new IllegalArgumentException("null");
synchronized (includeFiles) {
    includeFiles.add(include);
  }
}

public void addIncludeFiles ( FileMatch include ) { if ( include == null ) throw new IllegalArgumentException ( "null" ) ; synchronized ( includeFiles ) { includeFiles . add ( include ) ; } }
adds a filter to the includefiles property . a file is selected if at least one filter matches .
