1using System;
2using System.Data;
3using System.IO;
4using Lucene.Net.Analysis;
5using Lucene.Net.Analysis.Standard;
6using Lucene.Net.Documents;
7using Lucene.Net.Search;
8using Lucene.Net.QueryParsers;
9using Lucene.Net.Index;
10using Lucene.Net.Util;
11
12namespace LuceneEngine.Search
13{
14	public class SearchFiles
15	{
16		#region Properties   ...
17
18		private string mstrIndexLocation = "";
19		public string IndexLocation
20		{
21			get { return mstrIndexLocation; }
22			set { mstrIndexLocation = value; }
23		}
24		private string mstrSearchFor = "";
25		public string SearchFor
26		{
27			get { return mstrSearchFor; }
28			set { mstrSearchFor = value; }
29		}
30		private DateTime mdteLastWriteFrom = Convert.ToDateTime("1/1/1990");
31		public DateTime LastWriteFrom
32		{
33			get { return mdteLastWriteFrom; }
34			set { mdteLastWriteFrom = value; }
35		}
36		private DateTime mdteLastWriteTo = DateTime.Today.AddDays(1);
37		public DateTime LastWriteTo
38		{
39			get { return mdteLastWriteTo; }
40			set { mdteLastWriteTo = value; }
41		}
42		private int mintNumHitsRequested = 10;
43		public int NumHitsRequested
44		{
45			get { return mintNumHitsRequested; }
46			set { mintNumHitsRequested = value; }
47		}
48		private long mlngNumHitsFound = 0;
49		public long NumHitsFound
50		{
51			get { return mlngNumHitsFound; }
52		}
53		private string mstrResultsXML = "";
54		public string ResultsXML
55		{
56			get { return mstrResultsXML; }
57		}
58		private DataView mobjResultsDataView;
59		public DataView ResultsDataView
60		{
61			get { return mobjResultsDataView; }
62		}
63		private long mlngTotalTime = 0;
64		public long TotalTime
65		{
66			get { return mlngTotalTime; }
67		}
68		private string mstrError = "";
69		public string Error
70		{
71			get { return mstrError; }
72		}
73		#endregion
74		#region StartSearch   ...
75
76		public bool StartSearch()
77		{
78			bool bResult = false;
79
80			Searcher objSearcher = new IndexSearcher(mstrIndexLocation);
81			Analyzer objAnalyzer = new StandardAnalyzer();
82			try 
83			{
84				//Perform Search
85				DateTime dteStart = DateTime.Now;
86				Query objQuery = QueryParser.Parse(mstrSearchFor, "contents", objAnalyzer);
87				//Add date range filter
88				DateFilter objFilter = new DateFilter("last_write_time", 
89													  Date.GetTime(mdteLastWriteFrom), 
90													  Date.GetTime(mdteLastWriteTo.AddDays(1)));
91				Hits objHits = objSearcher.Search(objQuery, objFilter);
92				DateTime dteEnd = DateTime.Now;
93				mlngTotalTime = (Date.GetTime(dteEnd) - Date.GetTime(dteStart));
94				mlngNumHitsFound = objHits.Length();
95
96				//Generate results - convert to XML
97				mstrResultsXML = "";
98				if (mlngNumHitsFound > 0)
99				{
100					mstrResultsXML = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?><Results>";
101					//Loop through results
102					for (int i = 0; i < objHits.Length(); i++) 
103					{
104						try 
105						{
106							//Get the next result
107							Document objDocument = objHits.Doc(i);
108							//Extract the data
109							string strPath = objDocument.Get("path");
110							if (strPath == null) {strPath = "";}
111							string strLastWrite = objDocument.Get("last_write_time");
112							if (strLastWrite == null)
113								strLastWrite = "unavailable";
114							else
115							{
116                                strLastWrite = DateField.StringToDate(strLastWrite).ToShortDateString();
117							}
118							double dblScore = objHits.Score(i) * 100;
119							string strScore = String.Format("{0:00.00}", dblScore);
120							//Add results as an XML row
121							mstrResultsXML += "<Row>";
122							mstrResultsXML += "<Sequence>" + (i + 1).ToString() + "</Sequence>";
123							mstrResultsXML += "<Path>" + strPath + "</Path>";
124							mstrResultsXML += "<LastUpdated>" + strLastWrite + "</LastUpdated>";
125							mstrResultsXML += "<Score>" + strScore + "%" + "</Score>";
126							mstrResultsXML += "</Row>";
127						}
128						catch
129						{
130							break;
131						}
132					}
133					//Finish off XML
134					mstrResultsXML += "</Results>";
135
136					//Build Dataview (to bind to datagrid
137					DataSet objDS = new DataSet();
138					StringReader objSR = new StringReader(mstrResultsXML);
139					objDS.ReadXml(objSR);
140					objSR = null;
141					mobjResultsDataView = new DataView();
142					mobjResultsDataView = objDS.Tables[0].DefaultView;
143				}
144
145				//Finish up
146				objSearcher.Close();
147				bResult = true;
148			} 
149			catch (Exception e) 
150			{
151				mstrError = "Exception: " + e.Message;
152			}
153			finally
154			{
155				objSearcher = null;
156				objAnalyzer = null;
157			}
158			return bResult;
159		}
160		#endregion
161	}
162}