private static Query QueryFromStringExpression(SearchCriteriaString c, string field, Analyzer a)
{
if (c.WhatKind == StringExpressionKind.RegularExpression)
{
throw new NotSupportedException(String.Format(ComponentsText.ExceptionLuceneSearchKindNotSupported, c.WhatKind));
}
return(QueryFromStringExpression(c.What, field, a));
}
private static Query QueryFromStringExpression(SearchCriteriaString c, string field, Analyzer a)
{
if (c.WhatKind == StringExpressionKind.RegularExpression)
{
return(new RegexQuery(new Term(field, c.What)));
}
else
{
return(QueryFromStringExpression(c.What, field, a));
}
}
private static Query BuildLuceneQuery(SearchCriteriaCollection criteria, INewsFeed[] scope, Analyzer analyzer)
{
BooleanQuery masterQuery = null;
BooleanQuery bTerms = new BooleanQuery();
BooleanQuery bRanges = new BooleanQuery();
for (int i = 0; criteria != null && i < criteria.Count; i++)
{
ISearchCriteria sc = criteria[i];
if (sc is SearchCriteriaString)
{
SearchCriteriaString c = (SearchCriteriaString)sc;
if (string.IsNullOrEmpty(c.What))
{
continue;
}
if (c.Where == SearchStringElement.Undefined)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, IndexDocument.ItemContent, analyzer));
}
else
{
if ((c.Where & SearchStringElement.Title) > 0)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, Keyword.ItemTitle, analyzer));
}
if ((c.Where & SearchStringElement.Link) > 0)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, Keyword.ItemLink, analyzer));
}
if ((c.Where & SearchStringElement.Content) > 0)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, IndexDocument.ItemContent, analyzer));
}
if ((c.Where & SearchStringElement.Subject) > 0)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, Keyword.ItemTopic, analyzer));
}
if ((c.Where & SearchStringElement.Author) > 0)
{
AddBooleanClauseShould(bTerms, QueryFromStringExpression(c, Keyword.ItemAuthor, analyzer));
}
}
}
else if (sc is SearchCriteriaAge)
{
SearchCriteriaAge c = (SearchCriteriaAge)sc;
Term left, right;
string pastDate = "19900101",
pastDateTime = "199001010001";
string futureDate = DateTime.Now.AddYears(20).DateToInteger().ToString(NumberFormatInfo.InvariantInfo),
futureDateTime = DateTime.Now.AddYears(20).DateToInteger().ToString(NumberFormatInfo.InvariantInfo) + "0001";
if (c.WhatRelativeToToday.CompareTo(TimeSpan.Zero) == 0)
{
// compare date only:
//TODO: validate provided date(s) to be in the allowed ranges (pastDate, futureDate)!
switch (c.WhatKind)
{
case DateExpressionKind.Equal:
AddBooleanClauseMust(bRanges, new PrefixQuery(new Term(Keyword.ItemDate, c.WhatAsIntDateOnly.ToString(NumberFormatInfo.InvariantInfo)))); //itemDate == whatYearOnly;
break;
case DateExpressionKind.OlderThan:
left = new Term(Keyword.ItemDate, pastDate);
right = new Term(Keyword.ItemDate, c.What.DateToInteger().ToString(NumberFormatInfo.InvariantInfo));
AddBooleanClauseMust(bRanges, new RangeQuery(left, right, true)); // return itemDate < whatYearOnly;
break;
case DateExpressionKind.NewerThan:
left = new Term(Keyword.ItemDate, c.What.DateToInteger().ToString(NumberFormatInfo.InvariantInfo));
right = new Term(Keyword.ItemDate, futureDate);
AddBooleanClauseMust(bRanges, new RangeQuery(left, right, true)); // return itemDate > whatYearOnly;
break;
default:
break;
}
}
else
{
DateTime dt = DateTime.Now.ToUniversalTime().Subtract(c.WhatRelativeToToday);
switch (c.WhatKind)
{
case DateExpressionKind.OlderThan:
left = new Term(Keyword.ItemDate, pastDateTime);
right = new Term(Keyword.ItemDate, DateTools.TimeToString(dt.Ticks, DateTools.Resolution.MINUTE));
AddBooleanClauseMust(bRanges, new RangeQuery(left, right, true));
break;
case DateExpressionKind.NewerThan:
left = new Term(Keyword.ItemDate, DateTools.TimeToString(dt.Ticks, DateTools.Resolution.MINUTE));
right = new Term(Keyword.ItemDate, futureDateTime);
AddBooleanClauseMust(bRanges, new RangeQuery(left, right, true));
break;
default:
break;
}
}
}
else if (sc is SearchCriteriaDateRange)
{
SearchCriteriaDateRange c = (SearchCriteriaDateRange)sc;
Term left = new Term(Keyword.ItemDate, c.Bottom.DateToInteger().ToString(NumberFormatInfo.InvariantInfo));
Term right = new Term(Keyword.ItemDate, c.Top.DateToInteger().ToString(NumberFormatInfo.InvariantInfo));
AddBooleanClauseMust(bRanges, new RangeQuery(left, right, true)); // return itemDate > whatYearOnly;
}
}
// now we build: +(terms...) +ranges
if (bTerms.GetClauses().Length > 0)
{
masterQuery = new BooleanQuery();
AddBooleanClauseMust(masterQuery, bTerms);
}
if (bRanges.GetClauses().Length > 0)
{
if (masterQuery != null)
{
AddBooleanClauseMust(masterQuery, bRanges); // AND
}
else
{
masterQuery = bRanges;
}
}
// +scope
if (scope != null && scope.Length > 0 && masterQuery != null)
{
StringBuilder scopeQuery = new StringBuilder("(");
for (int i = 0; i < scope.Length; i++)
{
scopeQuery.Append(scope[i].id);
scopeQuery.Append(" ");
}
scopeQuery[scopeQuery.Length - 1] = ')';
// AND
AddBooleanClauseMust(masterQuery, QueryFromStringExpression(scopeQuery.ToString(), IndexDocument.FeedID, analyzer));
}
return(masterQuery);
}
