private void CheckForNullValueViolation(Variable variable)
{
if (variable.Type.IsNonNullType() && variable.Value is null)
{
throw new QueryException(QueryError.CreateVariableError(
"The variable value cannot be null.",
variable.Name));
}
}
private void CheckForInvalidValueType(Variable variable)
{
if (!variable.Type.IsInstanceOfType(variable.Value))
{
throw new QueryException(QueryError.CreateVariableError(
"The variable value is not of the correct type.",
variable.Name));
}
}
public T GetVariable <T>(string variableName)
{
if (string.IsNullOrEmpty(variableName))
{
throw new ArgumentNullException(nameof(variableName));
}
if (!TryGetVariable(variableName, out T variableValue))
{
throw new QueryException(QueryError.CreateVariableError(
"The specified variable was not declared.",
variableName));
}
return(variableValue);
}
public object ParseLiteral()
{
try
{
if (_parsedValue == null)
{
_parsedValue = Type.ParseLiteral(Value);
}
return(_parsedValue);
}
catch (ArgumentException ex)
{
throw new QueryException(
QueryError.CreateVariableError(
ex.Message, Name));
}
}
private Variable CreateVariable(
VariableDefinitionNode variableDefinition)
{
string variableName = variableDefinition.Variable.Name.Value;
IType variableType = GetType(variableDefinition.Type);
if (variableType is IInputType type)
{
return(new Variable(
variableName, type,
variableDefinition.DefaultValue));
}
throw new QueryException(QueryError.CreateVariableError(
$"The variable type ({variableType.ToString()}) " +
"must be an input object type.",
variableName));
}