/// <summary>
/// Creates the search sort clause for the element passed in
/// </summary>
/// <param name="element">Element.</param>
/// <returns>SortClause object to be used in a sort expression</returns>
private static ISortClause CreateSearchSortClause(SearchResultsOrderSetting element)
{
ISortClause toReturn = null;
switch (element)
{
case SearchResultsOrderSetting.ForumAscending:
toReturn = ForumFields.ForumName.Ascending();
break;
case SearchResultsOrderSetting.ForumDescending:
toReturn = ForumFields.ForumName.Descending();
break;
case SearchResultsOrderSetting.LastPostDateAscending:
toReturn = ThreadFields.ThreadLastPostingDate.Ascending();
break;
case SearchResultsOrderSetting.LastPostDateDescending:
toReturn = ThreadFields.ThreadLastPostingDate.Descending();
break;
case SearchResultsOrderSetting.ThreadSubjectAscending:
toReturn = ThreadFields.Subject.Ascending();
break;
case SearchResultsOrderSetting.ThreadSubjectDescending:
toReturn = ThreadFields.Subject.Descending();
break;
}
return(toReturn);
}
/// <summary>
/// Does the search using MS Full text search
/// </summary>
/// <param name="searchString">Search string.</param>
/// <param name="forumIDs">Forum Ids of forums to search into.</param>
/// <param name="orderFirstElement">Order first element setting.</param>
/// <param name="orderSecondElement">Order second element setting.</param>
/// <param name="forumsWithThreadsFromOthers">The forums with threads from others.</param>
/// <param name="userID">The userid of the calling user.</param>
/// <param name="targetToSearch">The target to search.</param>
/// <returns>
/// TypedList filled with threads matching the query.
/// </returns>
public static SearchResultTypedList DoSearch(string searchString, List<int> forumIDs, SearchResultsOrderSetting orderFirstElement,
SearchResultsOrderSetting orderSecondElement, List<int> forumsWithThreadsFromOthers, int userID, SearchTarget targetToSearch)
{
// the search utilizes full text search. It performs a CONTAINS upon the MessageText field of the Message entity.
string searchTerms = PrepareSearchTerms(searchString);
bool searchMessageText = (targetToSearch == SearchTarget.MessageText) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
bool searchSubject = (targetToSearch == SearchTarget.ThreadSubject) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
if(!(searchSubject || searchMessageText))
{
// no target specified, select message
searchMessageText = true;
}
PredicateExpression searchTermFilter = new PredicateExpression();
if(searchMessageText)
{
// Message contents filter
searchTermFilter.Add(new FieldCompareSetPredicate(ThreadFields.ThreadID, MessageFields.ThreadID,
SetOperator.In, new FieldFullTextSearchPredicate(MessageFields.MessageText, FullTextSearchOperator.Contains, searchTerms)));
}
if(searchSubject)
{
// Thread subject filter
if(searchMessageText)
{
searchTermFilter.AddWithOr(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
}
else
{
searchTermFilter.Add(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
}
}
IPredicateExpression mainFilter = searchTermFilter
.And(ForumFields.ForumID == forumIDs)
.And(ThreadGuiHelper.CreateThreadFilter(forumsWithThreadsFromOthers, userID));
ISortExpression sorter = new SortExpression();
// add first element
sorter.Add(CreateSearchSortClause(orderFirstElement));
if(orderSecondElement != orderFirstElement)
{
sorter.Add(CreateSearchSortClause(orderSecondElement));
}
SearchResultTypedList results = new SearchResultTypedList(false);
try
{
// get the data from the db.
results.Fill(500, sorter, false, mainFilter);
}
catch
{
// probably an error with the search words / user error. Swallow for now, which will result in an empty resultset.
}
return results;
}
private async Task PerformSearchAsync(string searchParameters, List <int> forumIDs, SearchResultsOrderSetting orderFirstElement,
SearchResultsOrderSetting orderSecondElement, SearchTarget targetToSearch)
{
var searchTerms = searchParameters.Length > 1024 ? searchParameters.Substring(0, 1024) : searchParameters;
var results = await Searcher.DoSearchAsync(searchTerms, forumIDs, orderFirstElement, orderSecondElement,
this.HttpContext.Session.GetForumsWithActionRight(ActionRights.ViewNormalThreadsStartedByOthers),
this.HttpContext.Session.GetUserID(), targetToSearch);
this.HttpContext.Session.AddSearchTermsAndResults(_cache, searchTerms, results);
}
private void btnSearch_ServerClick(object sender, System.EventArgs e)
{
if (Page.IsValid)
{
// grab forum id's
List <int> forumIDs = new List <int>();
for (int i = 0; i < lbxForums.Items.Count; i++)
{
if (lbxForums.Items[i].Selected)
{
forumIDs.Add(Convert.ToInt32(lbxForums.Items[i].Value));
}
}
if (forumIDs.Count <= 0)
{
// no forums selected, add all of them
for (int i = 0; i < lbxForums.Items.Count; i++)
{
forumIDs.Add(Convert.ToInt32(lbxForums.Items[i].Value));
}
}
SearchResultsOrderSetting orderFirstElement = (SearchResultsOrderSetting)cbxSortByFirstElement.SelectedIndex;
SearchResultsOrderSetting orderSecondElement = (SearchResultsOrderSetting)cbxSortBySecondElement.SelectedIndex;
SearchTarget targetToSearch = (SearchTarget)cbxElementToSearch.SelectedIndex;
string searchTerms = tbxSearchString.Value;
if (searchTerms.Length > 1024)
{
searchTerms = searchTerms.Substring(0, 1024);
}
// Use Full text search variant.
SearchResultTypedList results = BL.Searcher.DoSearch(searchTerms, forumIDs, orderFirstElement, orderSecondElement,
SessionAdapter.GetForumsWithActionRight(ActionRights.ViewNormalThreadsStartedByOthers), SessionAdapter.GetUserID(), targetToSearch);
// store results in session.
SessionAdapter.AddSearchTermsAndResults(searchTerms, results);
// view results.
Response.Redirect("SearchResults.aspx?Page=1", true);
}
}
/// <summary>
/// Does the search using MS Full text search
/// </summary>
/// <param name="searchString">Search string.</param>
/// <param name="forumIDs">Forum Ids of forums to search into.</param>
/// <param name="orderFirstElement">Order first element setting.</param>
/// <param name="orderSecondElement">Order second element setting.</param>
/// <param name="forumsWithThreadsFromOthers">The forums with threads from others.</param>
/// <param name="userID">The userid of the calling user.</param>
/// <param name="targetToSearch">The target to search.</param>
/// <returns>
/// TypedList filled with threads matching the query.
/// </returns>
public static SearchResultTypedList DoSearch(string searchString, List <int> forumIDs, SearchResultsOrderSetting orderFirstElement,
SearchResultsOrderSetting orderSecondElement, List <int> forumsWithThreadsFromOthers, int userID, SearchTarget targetToSearch)
{
// the search utilizes full text search. It performs a CONTAINS upon the MessageText field of the Message entity.
string searchTerms = PrepareSearchTerms(searchString);
bool searchMessageText = (targetToSearch == SearchTarget.MessageText) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
bool searchSubject = (targetToSearch == SearchTarget.ThreadSubject) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
if (!(searchSubject || searchMessageText))
{
// no target specified, select message
searchMessageText = true;
}
PredicateExpression searchTermFilter = new PredicateExpression();
if (searchMessageText)
{
// Message contents filter
searchTermFilter.Add(new FieldCompareSetPredicate(ThreadFields.ThreadID, MessageFields.ThreadID,
SetOperator.In, new FieldFullTextSearchPredicate(MessageFields.MessageText, FullTextSearchOperator.Contains, searchTerms)));
}
if (searchSubject)
{
// Thread subject filter
if (searchMessageText)
{
searchTermFilter.AddWithOr(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
}
else
{
searchTermFilter.Add(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
}
}
IPredicateExpression mainFilter = searchTermFilter
.And(ForumFields.ForumID == forumIDs)
.And(ThreadGuiHelper.CreateThreadFilter(forumsWithThreadsFromOthers, userID));
ISortExpression sorter = new SortExpression();
// add first element
sorter.Add(CreateSearchSortClause(orderFirstElement));
if (orderSecondElement != orderFirstElement)
{
sorter.Add(CreateSearchSortClause(orderSecondElement));
}
SearchResultTypedList results = new SearchResultTypedList(false);
try
{
// get the data from the db.
results.Fill(500, sorter, false, mainFilter);
}
catch
{
// probably an error with the search words / user error. Swallow for now, which will result in an empty resultset.
}
return(results);
}
/// <summary>
/// Does the search using MS Full text search
/// </summary>
/// <param name="searchString">Search string.</param>
/// <param name="forumIds">Forum Ids of forums to search into.</param>
/// <param name="orderFirstElement">Order first element setting.</param>
/// <param name="orderSecondElement">Order second element setting.</param>
/// <param name="forumsWithThreadsFromOthers">The forums with threads from others.</param>
/// <param name="userId">The userid of the calling user.</param>
/// <param name="targetToSearch">The target to search.</param>
/// <returns>
/// TypedList filled with threads matching the query.
/// </returns>
public static async Task <List <SearchResultRow> > DoSearchAsync(string searchString, List <int> forumIds, SearchResultsOrderSetting orderFirstElement,
SearchResultsOrderSetting orderSecondElement, List <int> forumsWithThreadsFromOthers, int userId,
SearchTarget targetToSearch)
{
// the search utilizes full text search. It performs a CONTAINS upon the MessageText field of the Message entity.
var searchTerms = PrepareSearchTerms(searchString);
var searchMessageText = (targetToSearch == SearchTarget.MessageText) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
var searchSubject = (targetToSearch == SearchTarget.ThreadSubject) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
if (!(searchSubject || searchMessageText))
{
// no target specified, select message
searchMessageText = true;
}
var qf = new QueryFactory();
var searchTermFilter = new PredicateExpression();
if (searchMessageText)
{
// Message contents filter
searchTermFilter.Add(ThreadFields.ThreadID.In(qf.Create()
.Select(MessageFields.ThreadID)
.Where(new FieldFullTextSearchPredicate(MessageFields.MessageText, null, FullTextSearchOperator.Contains,
searchTerms))));
}
if (searchSubject)
{
// Thread subject filter
if (searchMessageText)
{
searchTermFilter.AddWithOr(new FieldFullTextSearchPredicate(ThreadFields.Subject, null, FullTextSearchOperator.Contains, searchTerms));
}
else
{
searchTermFilter.Add(new FieldFullTextSearchPredicate(ThreadFields.Subject, null, FullTextSearchOperator.Contains, searchTerms));
}
}
var q = qf.GetSearchResultTypedList()
.Where(searchTermFilter
.And(ForumFields.ForumID.In(forumIds))
.And(ThreadGuiHelper.CreateThreadFilter(forumsWithThreadsFromOthers, userId)))
.Limit(500)
.OrderBy(CreateSearchSortClause(orderFirstElement))
.Distinct();
if (orderSecondElement != orderFirstElement)
{
// simply call OrderBy again, it will append the sortclause to the existing one.
q.OrderBy(CreateSearchSortClause(orderSecondElement));
}
List <SearchResultRow> toReturn;
try
{
// get the data from the db.
using (var adapter = new DataAccessAdapter())
{
toReturn = await adapter.FetchQueryAsync(q).ConfigureAwait(false);
}
}
catch
{
// probably an error with the search words / user error. Swallow for now, which will result in an empty resultset.
toReturn = new List <SearchResultRow>();
}
return(toReturn);
}
/// <summary>
/// Creates the search sort clause for the element passed in
/// </summary>
/// <param name="element">Element.</param>
/// <returns>SortClause object to be used in a sort expression</returns>
private static ISortClause CreateSearchSortClause(SearchResultsOrderSetting element)
{
ISortClause toReturn = null;
switch(element)
{
case SearchResultsOrderSetting.ForumAscending:
toReturn = ForumFields.ForumName.Ascending();
break;
case SearchResultsOrderSetting.ForumDescending:
toReturn = ForumFields.ForumName.Descending();
break;
case SearchResultsOrderSetting.LastPostDateAscending:
toReturn = ThreadFields.ThreadLastPostingDate.Ascending();
break;
case SearchResultsOrderSetting.LastPostDateDescending:
toReturn = ThreadFields.ThreadLastPostingDate.Descending();
break;
case SearchResultsOrderSetting.ThreadSubjectAscending:
toReturn = ThreadFields.Subject.Ascending();
break;
case SearchResultsOrderSetting.ThreadSubjectDescending:
toReturn = ThreadFields.Subject.Descending();
break;
}
return toReturn;
}