/// <summary>
/// Evaluates the specified expression.
/// </summary>
/// <param name="expression">The expression to evaluate.</param>
/// <returns>Value of the expression.</returns>
public QueryValue Visit(LinqLengthPropertyExpression expression)
{
var instance = (QueryScalarValue)this.Evaluate(expression.Instance);
var evaluationStrategy = instance.Type.EvaluationStrategy;
// TODO: is this abstracted enough?
return(evaluationStrategy.EvaluateBuiltInFunction(evaluationStrategy.IntegerType, "Edm", "Length", instance));
}
/// <summary>
/// Replaces the given expression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Replaced expression.</returns>
public QueryExpression Visit(LinqLengthPropertyExpression expression)
{
var instance = this.ReplaceExpression(expression.Instance);
if (this.HasChanged(expression.Instance, instance))
{
return(new LinqLengthPropertyExpression(instance, expression.ExpressionType));
}
else
{
return(expression);
}
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqLengthPropertyExpression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Uri query string representing the expression.</returns>
public virtual string Visit(LinqLengthPropertyExpression expression)
{
throw new TaupoNotSupportedException("Not supported");
}
/// <summary>
/// Generates System.CodeDom.CodeExpression from the given expression.
/// </summary>
/// <param name="expression">Expression from which System.CodeDom.CodeExpression is generated.</param>
/// <returns>Generated System.CodeDom.CodeExpression.</returns>
public virtual CodeExpression Visit(LinqLengthPropertyExpression expression)
{
var instance = this.GenerateCode(expression.Instance);
return(Code.Property(instance, "Length"));
}
/// <summary>
/// Resolves types for the specified expression.
/// </summary>
/// <param name="expression">The expression to resolve types for.</param>
/// <returns>Expression with resolved types.</returns>
public QueryExpression Visit(LinqLengthPropertyExpression expression)
{
var instance = this.ResolveTypes(expression.Instance);
return(new LinqLengthPropertyExpression(instance, this.EvaluationStrategy.IntegerType));
}
