/// <summary>
/// Orders the collection by applying given ordering.
/// </summary>
/// <param name="ordering">The ordering to use.</param>
/// <returns>Ordered collection.</returns>
/// <remarks>This overload allows for more intellisense-friendly way of specifying ordering.</remarks>
public QueryCollectionValue OrderBy(QueryOrdering ordering)
{
ExceptionUtilities.CheckArgumentNotNull(ordering, "ordering");
ExceptionUtilities.CheckCollectionNotEmpty(ordering.Selectors, "ordering.Selectors");
if (this.IsNull)
{
return(this);
}
IEnumerable <QueryValue> orderedElements = ordering.Apply(this.Elements.Cast <object>()).Cast <QueryValue>();
QueryError currentError = QueryError.Combine(this.EvaluationError, QueryError.GetErrorFromValues(orderedElements));
if (currentError != null)
{
return((QueryCollectionValue)this.Type.CreateErrorValue(currentError));
}
// if this collection contains duplicate order by key selectors
if (HasNondeterministicOrdering(ordering, orderedElements))
{
return(new QueryCollectionValue(this.Type, this.EvaluationStrategy, null, orderedElements, false));
}
else
{
return(new QueryCollectionValue(this.Type, this.EvaluationStrategy, null, orderedElements, true));
}
}
/// <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>
/// Creates the collection value with the specified elements.
/// </summary>
/// <param name="elementType">The type of each collection element.</param>
/// <param name="elements">The elements.</param>
/// <returns>
/// Strongly-typed collection with the specified values.
/// </returns>
public static QueryCollectionValue Create(QueryType elementType, params QueryValue[] elements)
{
ExceptionUtilities.CheckArgumentNotNull(elementType, "elementType");
return(new QueryCollectionValue(
elementType.CreateCollectionType(),
elementType.EvaluationStrategy,
QueryError.GetErrorFromValues(elements),
elements));
}
/// <summary>
/// Applies a projection operator which selects a value from each collection element.
/// </summary>
/// <param name="selector">The selector.</param>
/// <returns>
/// Collection of values containing results of the selector applied to all elements of the collection.
/// </returns>
public QueryCollectionValue Select(Func <QueryValue, QueryValue> selector)
{
ExceptionUtilities.CheckArgumentNotNull(selector, "selector");
IEnumerable <QueryValue> result;
QueryCollectionType resultType;
this.ComputeSelectResult(selector, out result, out resultType);
return(new QueryCollectionValue(resultType, this.EvaluationStrategy, QueryError.GetErrorFromValues(result), result, this.IsSorted));
}
/// <summary>
/// Creates the collection value with the specified elements.
/// </summary>
/// <param name="elementType">The type of each collection element.</param>
/// <param name="elements">The elements.</param>
/// <param name="isSorted">Indicating if the collection is sorted.</param>
/// <returns>Strongly-typed collection with the specified values.</returns>
public static QueryCollectionValue Create(QueryType elementType, IEnumerable <QueryValue> elements, bool isSorted)
{
ExceptionUtilities.CheckArgumentNotNull(elementType, "elementType");
return(new QueryCollectionValue(
elementType.CreateCollectionType(),
elementType.EvaluationStrategy,
QueryError.GetErrorFromValues(elements),
elements,
isSorted));
}
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>
/// Applies a projection operator which selects a value from each collection element.
/// </summary>
/// <param name="selector">The selector.</param>
/// <param name="resultType">Type of the result</param>
/// <returns>
/// Collection of values containing results of the selector applied to all elements of the collection.
/// </returns>
public QueryCollectionValue Select(Func <QueryValue, QueryValue> selector, QueryCollectionType resultType)
{
ExceptionUtilities.CheckArgumentNotNull(selector, "selector");
IEnumerable <QueryValue> result = null;
if (!this.IsNull)
{
result = this.Elements.Cast <QueryValue>().Select(e => selector(e)).ToList();
}
return(new QueryCollectionValue(resultType, this.EvaluationStrategy, QueryError.GetErrorFromValues(result), result, this.IsSorted));
}
/// <summary>
/// Gets distinct elements from the collection.
/// </summary>
/// <returns>Distinct elements of the collection.</returns>
public QueryCollectionValue Distinct()
{
List <QueryValue> distinctValues = new List <QueryValue>();
foreach (var element in this.Elements)
{
if (!distinctValues.Any(v => this.ValuesAreEqual(v, element)))
{
distinctValues.Add(element);
}
}
return(new QueryCollectionValue(this.Type, this.EvaluationStrategy, QueryError.GetErrorFromValues(distinctValues), distinctValues));
}
/// <summary>
/// Applies the Take operation on the given collection.
/// </summary>
/// <param name="takeCount">How many elements to take.</param>
/// <returns>Collection with the applied Take operation.</returns>
public QueryCollectionValue Take(QueryScalarValue takeCount)
{
ExceptionUtilities.CheckArgumentNotNull(takeCount, "takeCount");
QueryError currentError = QueryError.Combine(this.EvaluationError, takeCount.EvaluationError);
if (currentError != null)
{
return((QueryCollectionValue)this.Type.CreateErrorValue(currentError));
}
IEnumerable <QueryValue> result = null;
if (!this.IsNull)
{
result = this.Elements.Take((int)takeCount.Value).ToList();
}
return(new QueryCollectionValue(this.Type, this.Type.EvaluationStrategy, QueryError.GetErrorFromValues(result), result, this.IsSorted));
}
/// <summary>
/// Applies the Skip operation on the given collection.
/// </summary>
/// <param name="skipCount">How many elements to skip.</param>
/// <returns>Collection with the applied Skip operation.</returns>
public QueryCollectionValue Skip(QueryScalarValue skipCount)
{
ExceptionUtilities.CheckArgumentNotNull(skipCount, "skipCount");
QueryError currentError = QueryError.Combine(this.EvaluationError, skipCount.EvaluationError);
if (currentError != null)
{
return((QueryCollectionValue)this.Type.CreateErrorValue(currentError));
}
IEnumerable <QueryValue> result = null;
if (!this.IsNull)
{
// perhaps this must be changed - moved to EvaluationStrategy
result = this.Elements.Skip((int)skipCount.Value);
}
return(new QueryCollectionValue(this.Type, this.Type.EvaluationStrategy, QueryError.GetErrorFromValues(result), result, this.IsSorted));
}
/// <summary>
/// Groups elements using key computed from the key selector.
/// </summary>
/// <param name="keySelector">Key selector lambda.</param>
/// <returns>Elements grouped based on the provided key.</returns>
public QueryCollectionValue GroupBy(Func <QueryValue, QueryValue> keySelector)
{
if (this.IsNull)
{
return(new QueryCollectionValue(this.Type.ElementType.CreateCollectionType(), this.EvaluationStrategy, this.EvaluationError, null));
}
var keys = this.Elements.Select(keySelector).ToList();
var keyCollection = new QueryCollectionValue(this.Type.ElementType.CreateCollectionType(), this.EvaluationStrategy, this.EvaluationError, keys);
var distinctKeys = keyCollection.Distinct().Elements;
var elementType = this.Type.ElementType;
var groupings = distinctKeys.Select(key =>
{
if (key.IsNull)
{
var matchingNullElements = this.Elements.Where(element => keySelector(element).IsNull);
return(this.CreateGroupingValue(key, QueryCollectionValue.Create(elementType, matchingNullElements.ToArray())));
}
else
{
return(this.CreateGroupingValue(key, QueryCollectionValue.Create(elementType, this.Elements.Where(element => this.ValuesAreEqual(keySelector(element), key)).ToArray())));
}
});
var keyType = keySelector(elementType.NullValue).Type;
var groupingType = new QueryGroupingType(keyType, elementType, this.EvaluationStrategy);
return(new QueryCollectionValue(groupingType.CreateCollectionType(), this.EvaluationStrategy, QueryError.GetErrorFromValues(groupings), groupings.Cast <QueryValue>()));
}
/// <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>
/// 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>
/// Creates a collection with values the specified values.
/// </summary>
/// <param name="elements">The collection elements. If null is passed, the collection will be a null
/// collection.</param>
/// <returns>Newly created collection value.</returns>
public virtual QueryCollectionValue CreateCollectionWithValues(IEnumerable <QueryValue> elements)
{
return(new QueryCollectionValue(this, this.EvaluationStrategy, QueryError.GetErrorFromValues(elements), elements));
}