InputStream is = (InputStream) inputStreamsByFileName.get( fileName );
InputStream is = null; if (inputStreamsByFileName != null)  { is = (InputStream) inputStreamsByFileName.get( fileName ); }
	private InputStream getInputStream(String fileName, File polishHome, Map inputStreamsByFileName) {		InputStream is = (InputStream) inputStreamsByFileName.get( fileName );		if (is == null) {			File file = new File( polishHome, fileName );			if ( file.exists() ) {				try {					return new FileInputStream( file );				} catch (FileNotFoundException e) {					// this should not happen, since we explicitely test this case					e.printStackTrace();				}			}		}		return is;	}