/// <summary>
/// Do the specified BinaryOperation for the two values and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <returns>
/// Result of the operation.
/// </returns>
public override QueryScalarValue Evaluate(QueryBinaryOperation operation, QueryScalarValue firstValue, QueryScalarValue secondValue)
{
if (operation == QueryBinaryOperation.LessThan || operation == QueryBinaryOperation.LessThanOrEqualTo)
{
return this.PerformNullSafeLessThan(firstValue, secondValue, operation);
}
return base.Evaluate(operation, firstValue, secondValue);
}
/// <summary>
/// Determines whether a typed data can do certain operation with another typed data
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="sourceType">the type of data to operation on</param>
/// <param name="otherType">the other type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public override bool Supports(QueryBinaryOperation operation, QueryScalarType sourceType, QueryScalarType otherType)
{
if (this.IsSpatialType((IQueryClrType)sourceType) || this.IsSpatialType((IQueryClrType)otherType))
{
return(false);
}
return(base.Supports(operation, sourceType, otherType));
}
/// <summary>
/// Determines whether a typed data can do certain operation with another typed data
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="sourceType">the type of data to operation on</param>
/// <param name="otherType">the other type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public virtual bool Supports(QueryBinaryOperation operation, QueryScalarType sourceType, QueryScalarType otherType)
{
var sourceQueryClrType = (IQueryClrType)sourceType;
var otherQueryClrType = (IQueryClrType)otherType;
var sourceClrType = sourceQueryClrType.ClrType;
var otherClrType = otherQueryClrType.ClrType;
switch (operation)
{
case QueryBinaryOperation.Add:
case QueryBinaryOperation.Divide:
case QueryBinaryOperation.Modulo:
case QueryBinaryOperation.Multiply:
case QueryBinaryOperation.Subtract:
return(LinqTypeSemantics.IsNumeric(sourceClrType) &&
LinqTypeSemantics.IsNumeric(otherClrType) &&
this.HaveCommonType(sourceClrType, otherClrType));
case QueryBinaryOperation.BitwiseAnd:
case QueryBinaryOperation.BitwiseExclusiveOr:
case QueryBinaryOperation.BitwiseOr:
return(LinqTypeSemantics.IsIntegralType(sourceClrType) &&
LinqTypeSemantics.IsIntegralType(otherClrType) &&
this.HaveCommonType(sourceClrType, otherClrType));
case QueryBinaryOperation.LogicalAnd:
case QueryBinaryOperation.LogicalOr:
return(sourceClrType == typeof(bool) && otherClrType == typeof(bool));
case QueryBinaryOperation.EqualTo:
case QueryBinaryOperation.NotEqualTo:
return(this.HaveCommonType(sourceClrType, otherClrType));
case QueryBinaryOperation.LessThan:
case QueryBinaryOperation.LessThanOrEqualTo:
case QueryBinaryOperation.GreaterThan:
case QueryBinaryOperation.GreaterThanOrEqualTo:
if (sourceClrType == typeof(byte[]) || otherClrType == typeof(byte[]) ||
sourceClrType == typeof(string) || otherClrType == typeof(string) ||
sourceClrType == typeof(bool) || otherClrType == typeof(bool) ||
sourceClrType == typeof(bool?) || otherClrType == typeof(bool?) ||
this.IsSpatialType(sourceQueryClrType) || this.IsSpatialType(otherQueryClrType))
{
return(false);
}
else
{
return(this.HaveCommonType(sourceClrType, otherClrType));
}
case QueryBinaryOperation.Concat:
return(sourceClrType == typeof(string) || otherClrType == typeof(string));
default:
throw new TaupoNotSupportedException("Unsupported query binary operation.");
}
}
/// <summary>
/// Do the specified BinaryOperation for the two values and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <returns>
/// Result of the operation.
/// </returns>
public override QueryScalarValue Evaluate(QueryBinaryOperation operation, QueryScalarValue firstValue, QueryScalarValue secondValue)
{
if (operation == QueryBinaryOperation.LessThan || operation == QueryBinaryOperation.LessThanOrEqualTo)
{
return(this.PerformNullSafeLessThan(firstValue, secondValue, operation));
}
return(base.Evaluate(operation, firstValue, secondValue));
}
/// <summary>
/// Determines whether a typed data can do certain operation with another typed data
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="sourceType">the type of data to operation on</param>
/// <param name="otherType">the other type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public override bool Supports(QueryBinaryOperation operation, QueryScalarType sourceType, QueryScalarType otherType)
{
if (this.IsSpatialType((IQueryClrType)sourceType) || this.IsSpatialType((IQueryClrType)otherType))
{
return false;
}
return base.Supports(operation, sourceType, otherType);
}
/// <summary>
/// Performs a null safe less-than or less-than-or-equal comparison
/// </summary>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <param name="queryBinaryOperation">The query binary operation. Must be LessThan or LessThanOrEqualTo.</param>
/// <returns>The result of the comparison.</returns>
internal QueryScalarValue PerformNullSafeLessThan(QueryScalarValue firstValue, QueryScalarValue secondValue, QueryBinaryOperation queryBinaryOperation)
{
ExceptionUtilities.Assert(queryBinaryOperation == QueryBinaryOperation.LessThan || queryBinaryOperation == QueryBinaryOperation.LessThanOrEqualTo, "Unsupported binary operation type {0}", queryBinaryOperation.ToString());
// LinqToObjects will lazy treat any LessThan or LessThanOrEqual expression
// where the first value is null as false UNLESS there is a specific comparison
// method supplied. It so happens that for certain types the Astoria server
// does supply the method, so the behavior is different based on the type
bool result;
if (ExpectLazyNullEvaluatiorForLessThan(firstValue))
{
result = false;
}
else
{
var comparisonResult = this.Compare(firstValue, secondValue);
if (queryBinaryOperation == QueryBinaryOperation.LessThan)
{
result = comparisonResult < 0;
}
else
{
result = comparisonResult <= 0;
}
}
return this.BooleanType.CreateValue(result);
}
/// <summary>
/// Performs a null safe less-than or less-than-or-equal comparison
/// </summary>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <param name="queryBinaryOperation">The query binary operation. Must be LessThan or LessThanOrEqualTo.</param>
/// <returns>The result of the comparison.</returns>
internal QueryScalarValue PerformNullSafeLessThan(QueryScalarValue firstValue, QueryScalarValue secondValue, QueryBinaryOperation queryBinaryOperation)
{
ExceptionUtilities.Assert(queryBinaryOperation == QueryBinaryOperation.LessThan || queryBinaryOperation == QueryBinaryOperation.LessThanOrEqualTo, "Unsupported binary operation type {0}", queryBinaryOperation.ToString());
// LinqToObjects will lazy treat any LessThan or LessThanOrEqual expression
// where the first value is null as false UNLESS there is a specific comparison
// method supplied. It so happens that for certain types the Astoria server
// does supply the method, so the behavior is different based on the type
bool result;
if (ExpectLazyNullEvaluatiorForLessThan(firstValue))
{
result = false;
}
else
{
var comparisonResult = this.Compare(firstValue, secondValue);
if (queryBinaryOperation == QueryBinaryOperation.LessThan)
{
result = comparisonResult < 0;
}
else
{
result = comparisonResult <= 0;
}
}
return(this.BooleanType.CreateValue(result));
}
/// <summary>
/// Determines whether an operation between two types is supported
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="sourceType">the type of data to operation on</param>
/// <param name="otherType">the other type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryBinaryOperation operation, QueryScalarType sourceType, QueryScalarType otherType)
{
throw new TaupoNotSupportedException("Attempt to use evaluation strategy from " + typeof(QueryUnresolvedType).Name + ". Please resolve expression first.");
}
/// <summary>
/// Determines whether an operation is applicable for this type
/// </summary>
/// <param name="operation">the operation</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryBinaryOperation operation)
{
return this.EvaluationStrategy.Supports(operation, this, this);
}
/// <summary>
/// Get properties in the structural type that support a specific Binary Operation.
/// </summary>
/// <param name="type">Structural Type.</param>
/// <param name="op">An enum that represents a Query Binary Operation.</param>
/// <returns>A collection of properties.</returns>
protected IEnumerable <QueryProperty <QueryScalarType> > GetPropertiesWithBinaryOpSupport(QueryStructuralType type, QueryBinaryOperation op)
{
List <QueryProperty <QueryScalarType> > queryProperties = type.Properties.Primitive().Where(m => m.PropertyType.Supports(op)).ToList();
DataServiceExecuteVerifier verifier = this.Verifier as DataServiceExecuteVerifier;
if (verifier != null && verifier.IsUri == false)
{
if (op == QueryBinaryOperation.GreaterThan || op == QueryBinaryOperation.GreaterThanOrEqualTo || op == QueryBinaryOperation.LessThan || op == QueryBinaryOperation.LessThanOrEqualTo)
{
// Exclude string, DateTime and boolean properties as these don't support greater than or less than operators in the Client Linq Code
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(string)).ToList();
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(bool)).ToList();
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(DateTime)).ToList();
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(Guid)).ToList();
}
}
return(queryProperties);
}
/// <summary>
/// Determines whether data of this type can do certain operation with data of another type
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="otherScalarType">the other data type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryBinaryOperation operation, QueryScalarType otherScalarType)
{
ExceptionUtilities.CheckArgumentNotNull(otherScalarType, "otherScalarType");
return this.EvaluationStrategy.Supports(operation, this, otherScalarType);
}
private QueryScalarValue EvaluateBinaryOperation(QueryScalarValue otherValue, QueryBinaryOperation operation)
{
ExceptionUtilities.CheckArgumentNotNull(otherValue, "otherValue");
var result = this.EvaluationStrategy.Evaluate(operation, this, otherValue);
var error = QueryError.Combine(this.EvaluationError, otherValue.EvaluationError);
if (error != null)
{
result.EvaluationError = error;
}
return(result);
}
/// <summary>
/// Do the specified BinaryOperation for the two values and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <returns>Result of the operation.</returns>
public QueryScalarValue Evaluate(QueryBinaryOperation operation, QueryScalarValue firstValue, QueryScalarValue secondValue)
{
throw new TaupoNotSupportedException("Attempt to use evaluation strategy from " + typeof(QueryUnresolvedType).Name + ". Please resolve expression first.");
}
/// <summary>
/// Determines whether data of this type can do certain operation with data of another type
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="otherScalarType">the other data type</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryBinaryOperation operation, QueryScalarType otherScalarType)
{
ExceptionUtilities.CheckArgumentNotNull(otherScalarType, "otherScalarType");
return(this.EvaluationStrategy.Supports(operation, this, otherScalarType));
}
/// <summary>
/// Do the specified BinaryOperation for the two values and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="firstValue">The first value.</param>
/// <param name="secondValue">The second value.</param>
/// <returns>Result of the operation.</returns>
public virtual QueryScalarValue Evaluate(QueryBinaryOperation operation, QueryScalarValue firstValue, QueryScalarValue secondValue)
{
Func <object, object, Type, object> evaluationMethod = null;
switch (operation)
{
case QueryBinaryOperation.Add:
evaluationMethod = ArithmeticEvaluationHelper.Add;
break;
case QueryBinaryOperation.Subtract:
evaluationMethod = ArithmeticEvaluationHelper.Subtract;
break;
case QueryBinaryOperation.Multiply:
evaluationMethod = ArithmeticEvaluationHelper.Multiply;
break;
case QueryBinaryOperation.Divide:
evaluationMethod = ArithmeticEvaluationHelper.Divide;
break;
case QueryBinaryOperation.Modulo:
evaluationMethod = ArithmeticEvaluationHelper.Modulo;
break;
case QueryBinaryOperation.BitwiseAnd:
evaluationMethod = ArithmeticEvaluationHelper.BitwiseAnd;
break;
case QueryBinaryOperation.BitwiseOr:
evaluationMethod = ArithmeticEvaluationHelper.BitwiseOr;
break;
case QueryBinaryOperation.BitwiseExclusiveOr:
evaluationMethod = ArithmeticEvaluationHelper.ExclusiveOr;
break;
case QueryBinaryOperation.LogicalAnd:
return(this.BooleanType.CreateValue((bool)firstValue.Value && (bool)secondValue.Value));
case QueryBinaryOperation.LogicalOr:
return(this.BooleanType.CreateValue((bool)firstValue.Value || (bool)secondValue.Value));
case QueryBinaryOperation.EqualTo:
return(this.BooleanType.CreateValue(this.AreEqual(firstValue, secondValue)));
case QueryBinaryOperation.NotEqualTo:
return(this.BooleanType.CreateValue(!this.AreEqual(firstValue, secondValue)));
case QueryBinaryOperation.LessThan:
return(this.BooleanType.CreateValue(this.Compare(firstValue, secondValue) < 0));
case QueryBinaryOperation.LessThanOrEqualTo:
return(this.BooleanType.CreateValue(this.Compare(firstValue, secondValue) <= 0));
case QueryBinaryOperation.GreaterThan:
return(this.BooleanType.CreateValue(this.Compare(firstValue, secondValue) > 0));
case QueryBinaryOperation.GreaterThanOrEqualTo:
return(this.BooleanType.CreateValue(this.Compare(firstValue, secondValue) >= 0));
case QueryBinaryOperation.Concat:
return(new QueryClrPrimitiveType(typeof(string), this).CreateValue(firstValue.Value.ToString() + secondValue.Value.ToString()));
default:
throw new TaupoNotSupportedException("Unsupported query binary operation.");
}
ExceptionUtilities.Assert(evaluationMethod != null, "evaluationMethod should not be null.");
return(this.ExecuteBinaryOperation(firstValue, secondValue, evaluationMethod));
}
/// <summary>
/// Determines whether an operation is applicable for this type
/// </summary>
/// <param name="operation">the operation</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryBinaryOperation operation)
{
return(this.EvaluationStrategy.Supports(operation, this, this));
}
/// <summary>
/// Get properties in the structural type that support a specific Binary Operation.
/// </summary>
/// <param name="type">Structural Type.</param>
/// <param name="op">An enum that represents a Query Binary Operation.</param>
/// <returns>A collection of properties.</returns>
protected IEnumerable<QueryProperty<QueryScalarType>> GetPropertiesWithBinaryOpSupport(QueryStructuralType type, QueryBinaryOperation op)
{
List<QueryProperty<QueryScalarType>> queryProperties = type.Properties.Primitive().Where(m => m.PropertyType.Supports(op)).ToList();
DataServiceExecuteVerifier verifier = this.Verifier as DataServiceExecuteVerifier;
if (verifier != null && verifier.IsUri == false)
{
if (op == QueryBinaryOperation.GreaterThan || op == QueryBinaryOperation.GreaterThanOrEqualTo || op == QueryBinaryOperation.LessThan || op == QueryBinaryOperation.LessThanOrEqualTo)
{
// Exclude string, DateTime and boolean properties as these don't support greater than or less than operators in the Client Linq Code
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(string)).ToList();
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(bool)).ToList();
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(DateTime)).ToList();
#if !WINDOWS_PHONE
queryProperties = queryProperties.Where(qp => (qp.PropertyType as IQueryClrType).ClrType != typeof(Guid)).ToList();
#endif
}
}
return queryProperties;
}
