package Chapter12;/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License.  You may obtain a copy of the License at * *     http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import java.io.File;import java.io.FileReader;import org.apache.lucene.document.DateTools;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;/** A utility for making Lucene Documents from a File. */public class FileDocument {  /** Makes a document for a File.    <p>    The document has three fields:    <ul>    <li><code>path</code>--containing the pathname of the file, as a stored,    untokenized field;    <li><code>modified</code>--containing the last modified date of the file as    a field as created by <a    href="lucene.document.DateTools.html">DateTools</a>; and    <li><code>contents</code>--containing the full contents of the file, as a    Reader field;    */  public static Document Document(File f)       throws java.io.FileNotFoundException {	     // make a new, empty document    Document doc = new Document();    // Add the path of the file as a field named "path".  Use a field that is     // indexed (i.e. searchable), but don't tokenize the field into words.    doc.add(new Field("path", f.getPath(), Field.Store.YES, Field.Index.UN_TOKENIZED));    // Add the last modified date of the file a field named "modified".  Use     // a field that is indexed (i.e. searchable), but don't tokenize the field    // into words.    doc.add(new Field("modified",        DateTools.timeToString(f.lastModified(), DateTools.Resolution.MINUTE),        Field.Store.YES, Field.Index.UN_TOKENIZED));    // Add the contents of the file to a field named "contents".  Specify a Reader,    // so that the text of the file is tokenized and indexed, but not stored.    // Note that FileReader expects the file to be in the system's default encoding.    // If that's not the case searching for special characters will fail.    doc.add(new Field("contents", new FileReader(f)));    // return the document    return doc;  }  private FileDocument() {}}