private string FormatFunction(ExpressionContext context)
{
var adapterVersion = context.Session?.Adapter.AdapterVersion ?? AdapterVersion.Default;
if (FunctionToOperatorMapping.TryGetOperatorMapping(_functionCaller, Function, adapterVersion, out var operatorMapping))
{
return(FormatMappedOperator(context, operatorMapping));
}
if (FunctionMapping.TryGetFunctionMapping(this.Function.FunctionName, this.Function.Arguments.Count(), adapterVersion, out var functionMapping))
{
return(FormatMappedFunction(context, functionMapping));
}
else if (string.Equals(this.Function.FunctionName, ODataLiteral.Any, StringComparison.OrdinalIgnoreCase) ||
string.Equals(this.Function.FunctionName, ODataLiteral.All, StringComparison.OrdinalIgnoreCase))
{
return(FormatAnyAllFunction(context));
}
else if (string.Equals(this.Function.FunctionName, ODataLiteral.IsOf, StringComparison.OrdinalIgnoreCase) ||
string.Equals(this.Function.FunctionName, ODataLiteral.Cast, StringComparison.OrdinalIgnoreCase))
{
return(FormatIsOfCastFunction(context));
}
else if (string.Equals(this.Function.FunctionName, "get_Item", StringComparison.Ordinal) &&
this.Function.Arguments.Count == 1)
{
return(FormatArrayIndexFunction(context));
}
else if (string.Equals(this.Function.FunctionName, "HasFlag", StringComparison.Ordinal) &&
this.Function.Arguments.Count == 1)
{
return(FormatEnumHasFlagFunction(context));
}
else if (string.Equals(this.Function.FunctionName, "ToString", StringComparison.Ordinal) &&
this.Function.Arguments.Count == 0)
{
return(FormatToStringFunction(context));
}
else if (this.Function.Arguments.Count == 1)
{
var val = this.Function.Arguments.First();
if (val.Value != null)
{
var formattedVal = ODataExpression.FromValue(
string.Equals(this.Function.FunctionName, "ToBoolean", StringComparison.Ordinal) ? Convert.ToBoolean(val.Value) :
string.Equals(this.Function.FunctionName, "ToByte", StringComparison.Ordinal) ? Convert.ToByte(val.Value) :
string.Equals(this.Function.FunctionName, "ToChar", StringComparison.Ordinal) ? Convert.ToChar(val.Value) :
string.Equals(this.Function.FunctionName, "ToDateTime", StringComparison.Ordinal) ? Convert.ToDateTime(val.Value) :
string.Equals(this.Function.FunctionName, "ToDecimal", StringComparison.Ordinal) ? Convert.ToDecimal(val.Value) :
string.Equals(this.Function.FunctionName, "ToDouble", StringComparison.Ordinal) ? Convert.ToDouble(val.Value) :
string.Equals(this.Function.FunctionName, "ToInt16", StringComparison.Ordinal) ? Convert.ToInt16(val.Value) :
string.Equals(this.Function.FunctionName, "ToInt32", StringComparison.Ordinal) ? Convert.ToInt32(val.Value) :
string.Equals(this.Function.FunctionName, "ToInt64", StringComparison.Ordinal) ? Convert.ToInt64(val.Value) :
string.Equals(this.Function.FunctionName, "ToSByte", StringComparison.Ordinal) ? Convert.ToSByte(val.Value) :
string.Equals(this.Function.FunctionName, "ToSingle", StringComparison.Ordinal) ? Convert.ToSingle(val.Value) :
string.Equals(this.Function.FunctionName, "ToString", StringComparison.Ordinal) ? Convert.ToString(val.Value) :
string.Equals(this.Function.FunctionName, "ToUInt16", StringComparison.Ordinal) ? Convert.ToUInt16(val.Value) :
string.Equals(this.Function.FunctionName, "ToUInt32", StringComparison.Ordinal) ? Convert.ToUInt32(val.Value) :
string.Equals(this.Function.FunctionName, "ToUInt64", StringComparison.Ordinal) ? (object)Convert.ToUInt64(val.Value)
: null);
if (formattedVal.Value != null)
{
return(FormatExpression(formattedVal, context));
}
}
}
throw new NotSupportedException($"The function {this.Function.FunctionName} is not supported or called with wrong number of arguments");
}
private string FormatMappedOperator(ExpressionContext context, FunctionToOperatorMapping mapping)
{
return(mapping.Format(context, _functionCaller, Function.Arguments));
}
public static bool TryGetOperatorMapping(ODataExpression functionCaller, ExpressionFunction function, AdapterVersion adapterVersion,
out FunctionToOperatorMapping operatorMapping)
{
operatorMapping = DefinedMappings.SingleOrDefault(x => x.CanMap(function.FunctionName, function.Arguments.Count, functionCaller, adapterVersion));
return(operatorMapping != null);
}
