import org.apache.lucene.analysis.util.RollingCharBuffer; //导入依赖的package包/类
/**
 * Initializes and populates {@see #scanner} 
 * 
 * The format of each line in filename must be as follows: inflected-form + space + lemma
 * @param filename the file containing the entries to be added
 * @throws FileNotFoundException 
 * @throws IOException
 */
private void init(Reader reader) throws FileNotFoundException, IOException {
	this.scanner = new Trie(true);
	// currently only adds the entries without any diff
	try (BufferedReader br = new BufferedReader(reader)) {
		String line;
		while ((line = br.readLine()) != null) {
			final int spaceIndex = line.indexOf(' ');
			if (spaceIndex == -1) {
				throw new IllegalArgumentException("The dictionary file is corrupted in the following line.\n" + line);
			} else {
				this.scanner.add(line.substring(0, spaceIndex), line.substring(spaceIndex+1));
			}
		}
		final Optimizer opt = new Optimizer();
		this.scanner.reduce(opt);
	}
	ioBuffer = new RollingCharBuffer();
	ioBuffer.reset(input);
}