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.*;
import org.apache.lucene.document.*;
import org.apache.lucene.demo.html.HTMLParser;
/** A utility for making Lucene Documents for HTML documents. */
public class HTMLDocument {
static char dirSep = System.getProperty("file.separator").charAt(0);
public static String uid(File f) {
// Append path and date into a string in such a way that lexicographic
// sorting gives the same results as a walk of the file hierarchy. Thus
// null (\u0000) is used both to separate directory components and to
// separate the path from the date.
return f.getPath().replace(dirSep, '\u0000') +
"\u0000" +
DateTools.timeToString(f.lastModified(), DateTools.Resolution.SECOND);
}
public static String uid2url(String uid) {
String url = uid.replace('\u0000', '/'); // replace nulls with slashes
return url.substring(0, url.lastIndexOf('/')); // remove date from end
}
public static Document Document(File f)
throws IOException, InterruptedException {
// make a new, empty document
Document doc = new Document();
// Add the url 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().replace(dirSep, '/'), 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 uid as a field, so that index can be incrementally maintained.
// This field is not stored with document, it is indexed, but it is not
// tokenized prior to indexing.
doc.add(new Field("uid", uid(f), Field.Store.NO, Field.Index.UN_TOKENIZED));
FileInputStream fis = new FileInputStream(f);
HTMLParser parser = new HTMLParser(fis);
// Add the tag-stripped contents as a Reader-valued Text field so it will
// get tokenized and indexed.
doc.add(new Field("contents", parser.getReader()));
// Add the summary as a field that is stored and returned with
// hit documents for display.
doc.add(new Field("summary", parser.getSummary(), Field.Store.YES, Field.Index.NO));
// Add the title as a field that it can be searched and that is stored.
doc.add(new Field("title", parser.getTitle(), Field.Store.YES, Field.Index.TOKENIZED));
// return the document
return doc;
}
private HTMLDocument() {}
}
|