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What this is

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The source code

package org.apache.lucene.demo;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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.Reader;
import java.io.FileInputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.DateField;

/** A utility for making Lucene Documents from a File. */

public class FileDocument {
  /** Makes a document for a File.
    

The document has three fields:

  • path--containing the pathname of the file, as a stored, tokenized field;
  • modified--containing the last modified date of the file as a keyword field as encoded by DateField; and
  • contents--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 Text field, so // that the index stores the path, and so that the path is searchable doc.add(Field.Text("path", f.getPath())); // Add the last modified date of the file a field named "modified". Use a // Keyword field, so that it's searchable, but so that no attempt is made // to tokenize the field into words. doc.add(Field.Keyword("modified", DateField.timeToString(f.lastModified()))); // Add the contents of the file a field named "contents". Use a Text // field, specifying a Reader, so that the text of the file is tokenized. // ?? why doesn't FileReader work here ?? FileInputStream is = new FileInputStream(f); Reader reader = new BufferedReader(new InputStreamReader(is)); doc.add(Field.Text("contents", reader)); // return the document return doc; } private FileDocument() {} }
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