/// <summary>
/// Rank the filtered items based on the matched occurences
/// </summary>
/// <returns>
/// Queryable ranked items. Each item will contain
/// the amount of hits found across the defined properties.
/// </returns>
/// <remarks>Only works in conjunction with string searches</remarks>
public IQueryable <IRanked <T> > ToRanked()
{
Expression combinedHitExpression = null;
foreach (var propertyToSearch in Properties)
{
var nullSafeExpression = BuildNullSafeExpression(propertyToSearch);
for (int j = 0; j < _searchTerms.Count; j++)
{
var searchTerm = _searchTerms[j];
var hitCountExpression = EnumerableExpressionHelper.CalculateHitCount(nullSafeExpression, searchTerm);
combinedHitExpression = ExpressionHelper.AddExpressions(combinedHitExpression, hitCountExpression);
}
}
var rankedInitExpression = EnumerableExpressionHelper.ConstructRankedResult <T>(combinedHitExpression, FirstParameter);
var selectExpression = Expression.Lambda <Func <T, Ranked <T> > >(rankedInitExpression, FirstParameter);
return(this.Select(selectExpression));
}
/// <summary>
/// Rank the filtered items based on the matched occurences
/// </summary>
/// <returns>
/// Enumerable of ranked items. Each item will contain
/// the amount of hits found across the defined properties
/// </returns>
public IEnumerable <IRanked <T> > ToRanked()
{
Expression combinedHitExpression = null;
foreach (var propertyToSearch in this.Properties)
{
for (int j = 0; j < this._containingSearchTerms.Count; j++)
{
var searchTerm = this._containingSearchTerms[j];
var nullSafeExpresion = this.BuildNullSafeExpresion(propertyToSearch);
var hitCountExpression = EnumerableExpressionHelper.CalculateHitCount(nullSafeExpresion, searchTerm, _searchOptions);
combinedHitExpression = ExpressionHelper.AddExpressions(combinedHitExpression, hitCountExpression);
}
}
var rankedInitExpression = EnumerableExpressionHelper.ConstructRankedResult <T>(combinedHitExpression, this.FirstParameter);
var selectExpression = Expression.Lambda <Func <T, Ranked <T> > >(rankedInitExpression, this.FirstParameter).Compile();
return(this.Select(selectExpression.Invoke));
}
/// <summary>
/// Rank the filtered items based on the matched occurences
/// </summary>
/// <returns>
/// Enumerable of ranked items. Each item will contain
/// the amount of hits found across the defined properties
/// </returns>
public IEnumerable <IRanked <T> > ToRanked(RankedType type = RankedType.Default)
{
Expression combinedHitExpression = null;
foreach (var propertyToSearch in Properties)
{
for (int j = 0; j < _searchTerms.Count; j++)
{
var searchTerm = _searchTerms[j];
var nullSafeExpresion = BuildNullSafeExpresion(propertyToSearch);
var hitCountExpression = type == RankedType.Default ? EnumerableExpressionHelper.CalculateHitCount(nullSafeExpresion, searchTerm, _searchOptions)
: EnumerableExpressionHelper.CalculateHitCount_LeftWeighted(nullSafeExpresion, searchTerm, _searchOptions);
combinedHitExpression = ExpressionHelper.AddExpressions(combinedHitExpression, hitCountExpression);
}
}
var rankedInitExpression = EnumerableExpressionHelper.ConstructRankedResult <T>(combinedHitExpression, FirstParameter);
var selectExpression = Expression.Lambda <Func <T, Ranked <T> > >(rankedInitExpression, FirstParameter).Compile();
return(this.Select(selectExpression.Invoke));
}
