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.
    <p>
    The document has three fields:
    <ul>
    <li><code>path</code>--containing the pathname of the file, as a stored,
    tokenized field;
    <li><code>modified</code>--containing the last modified date of the file as
    a keyword field as encoded by <a
    href="lucene.document.DateField.html">DateField</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 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() {}
}