/// <summary>
/// Do the specified UnaryOperation for the value and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="value">The value.</param>
/// <returns>Result of the operation.</returns>
public virtual QueryScalarValue Evaluate(QueryUnaryOperation operation, QueryScalarValue value)
{
Func <object, Type, object> evaluationMethod = null;
switch (operation)
{
case QueryUnaryOperation.LogicalNegate:
return(this.BooleanType.CreateValue(!(bool)value.Value));
case QueryUnaryOperation.Negate:
evaluationMethod = ArithmeticEvaluationHelper.Negate;
break;
case QueryUnaryOperation.BitwiseNot:
evaluationMethod = ArithmeticEvaluationHelper.BitwiseNot;
break;
default:
throw new TaupoNotSupportedException("Unsupported query unary operation.");
}
ExceptionUtilities.Assert(evaluationMethod != null, "evaluationMethod should not be null.");
Type clrType = ((QueryClrPrimitiveType)value.Type).ClrType;
object result = evaluationMethod(value.Value, clrType);
return(value.Type.CreateValue(result));
}
/// <summary>
/// Determines whether a typed data can do certain operation
/// </summary>
/// <param name="operation">the operation</param>
/// <param name="sourceType">the type of data to operate on</param>
/// <returns>Value <c>true</c> if operation can be performed; otherwise, <c>false</c>.</returns>
public bool Supports(QueryUnaryOperation operation, QueryScalarType sourceType)
{
switch (operation)
{
case QueryUnaryOperation.LogicalNegate:
return(((IQueryClrType)sourceType).ClrType == typeof(bool));
default:
throw new TaupoNotSupportedException("Unsupported query unary operation.");
}
}
/// <summary>
/// Determines whether data of this type can do certain operation
/// </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(QueryUnaryOperation operation)
{
return(this.EvaluationStrategy.Supports(operation, this));
}
/// <summary>
/// Determines whether data of this type can do certain operation
/// </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(QueryUnaryOperation operation)
{
return this.EvaluationStrategy.Supports(operation, this);
}
/// <summary>
/// Do the specified UnaryOperation for the value and returns the result.
/// </summary>
/// <param name="operation">The binary operation to perform.</param>
/// <param name="value">The value.</param>
/// <returns>Result of the operation.</returns>
public QueryScalarValue Evaluate(QueryUnaryOperation operation, QueryScalarValue value)
{
throw new TaupoNotSupportedException("Attempt to use evaluation strategy from " + typeof(QueryUnresolvedType).Name + ". Please resolve expression first.");
}
