/* | |
* 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. | |
*/ | |
using System; | |
using HTMLParser = Lucene.Net.Demo.Html.HTMLParser; | |
using Lucene.Net.Documents; | |
namespace Lucene.Net.Demo | |
{ | |
/// <summary>A utility for making Lucene Documents for HTML documents. </summary> | |
public class HTMLDocument | |
{ | |
internal static char dirSep = System.IO.Path.DirectorySeparatorChar.ToString()[0]; | |
public static System.String Uid(System.IO.FileInfo 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.FullName.Replace(dirSep, '\u0000') + "\u0000" + DateTools.TimeToString(((f.LastWriteTime.Ticks - 621355968000000000) / 10000), DateTools.Resolution.SECOND); | |
} | |
public static System.String Uid2url(System.String uid) | |
{ | |
System.String url = uid.Replace('\u0000', '/'); // replace nulls with slashes | |
return url.Substring(0, (url.LastIndexOf('/')) - (0)); // remove date from end | |
} | |
public static Document Document(System.IO.FileInfo f) | |
{ | |
// 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.FullName.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.LastWriteTime.Ticks - 621355968000000000) / 10000), 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)); | |
System.IO.FileStream fis = new System.IO.FileStream(f.FullName, System.IO.FileMode.Open, System.IO.FileAccess.Read); | |
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() | |
{ | |
} | |
} | |
} |