private string QueryExpansion(string input)
/*Expand the query from original word to synonym word list based on WORDNET library*/
{
string[] delim = { " " };
string[] words = input.Split(delim, StringSplitOptions.RemoveEmptyEntries);
Regex rgx = new Regex("[^a-zA-z]");
string result = input;
foreach (string word in words)
{
//get expansion here
List <string> synonyms = LuceneSearch_app.GetSynonym(stemmer.stemTerm(rgx.Replace(word, "")));
string temp = "";
foreach (string synonym in synonyms)
{
temp += " " + synonym;
}
if (word.StartsWith("\""))
{
result += temp;
}
else
{
result = result.Replace(word, (word + "^10" + temp));
}
}
return(result);
}
//FUNCTIONS TO CONVERT INFORMATION NEEDS TO QUERY
private string RemoveStopWords(string input)
/*Remove the stop word from the input query string*/
{
string result = LuceneSearch_app.GetProcessedQueryText(input, true);
return(result);
}
private void ShowResults(int index)
/*Put the search result into data grid area*/
{
List <string[]> results = LuceneSearch_app.GetResultCollection(index);
dataGridView.Rows.Clear();
foreach (string[] item in results)
{
item[4] = getFirstSentence(item[4]);
dataGridView.Rows.Add(item);
}
}
private void saveBtn_Click(object sender, EventArgs e)
/*Event trigger when Save button is clicked
* Save the result of query into a text file. require a querry ID is input into querry ID text box
* It will append into an existing file or create a new file is given name is not available*/
{
int queryId;
//Parse the query ID from query text box
bool result = Int32.TryParse(queryIdLabel.Text, out queryId);
if (result)
{
//result is an integer number then check if there is valid search result
if (LuceneSearch_app.ScoreDocs != null & LuceneSearch_app.ScoreDocs.Length > 0)
{
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
//Identify file extension filter
saveFileDialog1.Filter = "txt files (*.txt)|*.txt";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.RestoreDirectory = true;
saveFileDialog1.OverwritePrompt = false;
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
//save file with given queryID
string path = saveFileDialog1.FileName;
LuceneSearch_app.AppendSearchResult(path, queryId);
}
}
}
else
{
//show warning if no suitable query ID provided.
MessageBox.Show("Please enter query identification",
"About",
MessageBoxButtons.OK,
MessageBoxIcon.Exclamation,
MessageBoxDefaultButton.Button1);
}
}
private void search_btn_Click(object sender, EventArgs e)
/*Handle the event when clicking search button
* Search main routine*/
{
dataGridView.Rows.Clear();
search_query.Visible = true;
if (string.IsNullOrEmpty(search_input.Text))
{
next_button.Enabled = false;
LastButton.Enabled = false;
SearchTimeLabel.Visible = false;
page_label.Visible = false;
search_query.Text = "> Status: Please input a query";
return;
}
string query = search_input.Text;
Stopwatch stopwatch = Stopwatch.StartNew();
if (!Skip_process.Checked)
{
query = PreProcessQuery(query);
}
if (string.IsNullOrEmpty(query.Trim()))
{
next_button.Enabled = false;
LastButton.Enabled = false;
SearchTimeLabel.Visible = false;
page_label.Visible = false;
search_query.Text = "> Status: All of input is filtered by pre-processsing";
return;
}
search_query.Text = S_query_ori + "\n" + query;
totalPage = LuceneSearch_app.Search(query, SearchFieldCB.SelectedItem.ToString());
if (totalPage == 0)
{
currentPage = 0;
prev_button.Enabled = false;
next_button.Enabled = false;
FirstButton.Enabled = false;
LastButton.Enabled = false;
}
else
{
currentPage = 1;
prev_button.Enabled = false;
next_button.Enabled = false;
LastButton.Enabled = false;
FirstButton.Enabled = false;
if (totalPage > 1)
{
next_button.Enabled = true;
LastButton.Enabled = true;
}
ShowResults(currentPage);
}
stopwatch.Stop();
SearchTimeLabel.Text = string.Format("Found {0} result(s) in about {1}ms",
LuceneSearch_app.ScoreDocs.Length, stopwatch.ElapsedMilliseconds);
SearchTimeLabel.Visible = true;
UpdatePageLabel();
}
private void search_input_TextChanged(object sender, EventArgs e)
/*Event trigger when a text input into search text box
* Used to catch the word from input string and call suggestion feature*/
{
//Identify the start position of latest word in search text box
int wordEndPosition = search_input.SelectionStart;
int currentPosition = wordEndPosition;
while (currentPosition > 0 && search_input.Text[currentPosition - 1] != ' ')
{
currentPosition--;
}
//Read out the last word
string word = search_input.Text.Substring(currentPosition, wordEndPosition - currentPosition);
//Process if the read word is not whitespace/null and is more than 2 characters.
if (!String.IsNullOrWhiteSpace(word) && (word.Length > 2))
{
//Get the suggest word(s) from the original word
string[] suggestword = LuceneSearch_app.AutoCompleteSuggestion(word);
//Fit 3 words at most into the suggest word labels
switch (suggestword.Length)
{
case 1:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
SpellCheckLabel.Visible = true;
break;
case 2:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
autoText2.Text = suggestword[1];
autoText2.Visible = true;
SpellCheckLabel.Visible = true;
break;
case 3:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
autoText2.Text = suggestword[1];
autoText2.Visible = true;
autoText3.Text = suggestword[2];
autoText3.Visible = true;
SpellCheckLabel.Visible = true;
break;
default:
break;
}
}
else
{
//Disable all labels when there is nothing to suggest.
autoText1.Visible = false;
autoText2.Visible = false;
autoText3.Visible = false;
autoText1.Text = null;
SpellCheckLabel.Visible = false;
search_query.Visible = false;
}
}
