/// <summary>
/// Combines elements from both collections into one without eliminating duplicates.
/// </summary>
/// <param name="collection">The input collection for the union all operation</param>
/// <returns>Combined elements from both collections.</returns>
public QueryCollectionValue UnionAll(QueryCollectionValue collection)
{
List <QueryValue> resultValues = new List <QueryValue>();
resultValues.AddRange(this.Elements);
resultValues.AddRange(collection.Elements);
return(new QueryCollectionValue(this.Type, this.EvaluationStrategy, QueryError.GetErrorFromValues(resultValues), resultValues));
}
/// <summary>
/// Checks if both input collections have common elements
/// </summary>
/// <param name="collection">The input collection for the overlaps operation</param>
/// <returns>A true if both collections have common elements</returns>
public QueryScalarValue Overlaps(QueryCollectionValue collection)
{
IEnumerable <QueryValue> intersectingElements = this.Intersect(collection).Elements;
if (intersectingElements.Count() > 0)
{
return(this.EvaluationStrategy.BooleanType.CreateValue(true));
}
return(this.EvaluationStrategy.BooleanType.CreateValue(false));
}
private QueryStructuralValue CreateGroupingValue(QueryValue key, QueryCollectionValue elements)
{
QueryGroupingType groupingType = new QueryGroupingType(key.Type, elements.Type.ElementType, key.Type.EvaluationStrategy);
var error = QueryError.GetErrorFromValues(elements.Elements.Concat(new[] { key }));
var result = new QueryStructuralValue(groupingType, false, error, groupingType.EvaluationStrategy);
result.SetValue("Key", key);
result.SetValue("Elements", elements);
return(result);
}
/// <summary>
/// Determines if the current value is of a given type or an equivalent type in the type hierarchy
/// </summary>
/// <param name="resultType">The type to compare against</param>
/// <param name="performExactMatch">A flag that determines if an exact match needs to be performed</param>
/// <returns>The elements from the collection, that match the input type or an equivalent type</returns>
public QueryValue OfType(QueryStructuralType resultType, bool performExactMatch)
{
QueryCollectionValue result = resultType.CreateCollectionType().CreateCollectionWithValues(Enumerable.Empty <QueryValue>());
if (!this.IsNull)
{
foreach (QueryStructuralValue element in this.Elements)
{
bool isOfEquivalentType = (bool)((QueryScalarValue)element.IsOf(resultType, performExactMatch)).Value;
if (isOfEquivalentType)
{
result.Elements.Add(element.TreatAs(resultType));
}
}
}
return(result);
}
/// <summary>
/// Returns the first collection without the common elements from both input collections.
/// </summary>
/// <param name="collection">The input collection for the except operation</param>
/// <returns>The firt collection with commmon elements removed.</returns>
public QueryCollectionValue Except(QueryCollectionValue collection)
{
var resultValues = new List <QueryValue>();
foreach (QueryValue element in this.Elements)
{
if (!collection.Elements.Any(v => this.ValuesAreEqual(v, element)))
{
resultValues.Add(element);
}
}
// except removes duplicates from the result, so applying distinct at the end
var exceptResult = new QueryCollectionValue(this.Type, this.EvaluationStrategy, QueryError.GetErrorFromValues(resultValues), resultValues);
var result = exceptResult.Distinct();
return(result);
}
/// <summary>
/// Returns the first collection concatenanted with the second collection.
/// </summary>
/// <param name="collection">The collection to concatenate with.</param>
/// <returns>The concatenated result.</returns>
public QueryCollectionValue Concat(QueryCollectionValue collection)
{
var resultValues = this.Elements.Concat(collection.Elements);
return(new QueryCollectionValue(this.Type, this.EvaluationStrategy, QueryError.GetErrorFromValues(resultValues), resultValues));
}
/// <summary>
/// Combines elements from both collections into one and eliminates duplicates.
/// </summary>
/// <param name="collection">The input collection for the union operation</param>
/// <returns>Combined elements from both collections.</returns>
public QueryCollectionValue Union(QueryCollectionValue collection)
{
return(this.UnionAll(collection).Distinct());
}
private bool CollectionValuesAreEqual(QueryCollectionValue firstValueCollection, QueryCollectionValue secondValueCollection)
{
if (firstValueCollection.IsNull)
{
return(secondValueCollection.IsNull);
}
else if (secondValueCollection.IsNull)
{
return(false);
}
if (firstValueCollection.Elements.Count != secondValueCollection.Elements.Count)
{
return(false);
}
for (int i = 0; i < firstValueCollection.Elements.Count; i++)
{
if (!firstValueCollection.Elements.Any(e => this.ValuesAreEqual(e, secondValueCollection.Elements[i])) ||
!secondValueCollection.Elements.Any(e => this.ValuesAreEqual(e, firstValueCollection.Elements[i])))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Computes the Minimum value of a collection as a <see cref="QueryScalarValue"/>.
/// </summary>
/// <param name="collection">The collection of values.</param>
/// <returns>The min value.</returns>
public QueryScalarValue Min(QueryCollectionValue collection)
{
throw new TaupoNotSupportedException("Attempt to use evaluation strategy from " + typeof(QueryUnresolvedType).Name + ". Please resolve expression first.");
}
/// <summary>
/// Filters the specified source using given predicate.
/// </summary>
/// <typeparam name="TElement">The type of the element.</typeparam>
/// <param name="source">The source.</param>
/// <param name="predicate">The predicate.</param>
/// <returns>Filtered collection (including elements where the predicate matches).</returns>
/// <remarks>The value can be store-dependent w.r.t. handling of NULL values of the input collection
/// and/or result of the predicate.</remarks>
public QueryCollectionValue Filter(QueryCollectionValue source, Func <QueryValue, QueryScalarValue> predicate)
{
throw new TaupoNotSupportedException("Attempt to use evaluation strategy from " + typeof(QueryUnresolvedType).Name + ". Please resolve expression first.");
}
public static QueryValue ChooseRandomEvaluationResult(this IQueryExpressionEvaluator evaluator, QueryExpression queryExpression, IRandomNumberGenerator random, out QueryCollectionValue collection)
{
ExceptionUtilities.CheckArgumentNotNull(evaluator, "evaluator");
ExceptionUtilities.CheckArgumentNotNull(queryExpression, "queryExpression");
ExceptionUtilities.CheckArgumentNotNull(random, "random");
collection = evaluator.Evaluate(queryExpression) as QueryCollectionValue;
ExceptionUtilities.CheckObjectNotNull(collection, "Query unexpectedly evaluated to null or was not a collection: {0}", queryExpression);
ExceptionUtilities.Assert(collection.EvaluationError == null, "Query resulted in evaluation error: {0}", collection.EvaluationError);
if (collection.IsNull || collection.Elements.Count == 0)
{
return(null);
}
return(random.ChooseFrom(collection.Elements));
}
