public override object VisitOperationDefinition(GraphQLParser.OperationDefinitionContext context)
{
var operation = new Operation();
NewNode(operation, context);
operation.Name = context.NAME() != null?context.NAME().GetText() : "";
operation.SelectionSet = Visit(context.selectionSet()) as SelectionSet;
if (context.operationType() != null)
{
operation.OperationType = (OperationType)Enum.Parse(typeof(OperationType), context.operationType().GetText(), true);
}
if (context.variableDefinitions() != null)
{
operation.Variables = Visit(context.variableDefinitions()) as VariableDefinitions;
}
if (context.directives() != null)
{
operation.Directives = Visit(context.directives()) as Directives;
}
return(operation);
}
protected Object ExtractAppropriateObjectForOperation(Object topLevelObject, GraphQLParser.OperationDefinitionContext context)
{
if (context.operationType().GetText().ToLower() == "mutation")
{
var property = topLevelObject.GetType().GetProperties()
.FirstOrDefault(x => x.GetCustomAttribute <GraphQlMutationsAttribute>() != null);
if (property == null)
{
Error($"Could not find an object with 'GraphQlMutationsAttribute' on property to support mutation - {context.NAME().GetText()}", context);
}
return(property.GetValue(topLevelObject));
}
else if (context.operationType().GetText().ToLower() == "query")
{
var property = topLevelObject.GetType().GetProperties()
.FirstOrDefault(x => x.GetCustomAttribute <GraphQlTopLevelQueryAttribute>() != null);
if (property == null)
{
Error($"Could not find an object with 'GraphQlQueryAttribute' on property to support query - {context.NAME().GetText()}", context);
}
return(property.GetValue(topLevelObject));
}
else
{
Error($"Unexpected operation type - expected 'query' or 'mutation' received - {context.operationType().GetText()}", context);
return(null);
}
}
protected __Type ExtractAppropriate__TypeForOperation(__Schema schema, GraphQLParser.OperationDefinitionContext context)
{
if (context.operationType().GetText().ToLower() == "mutation")
{
return(schema.mutationType);
}
else if (context.operationType().GetText().ToLower() == "query")
{
return(schema.queryType);
}
else
{
Error($"Unexpected operation type - expected 'query' or 'mutation' received - {context.operationType().GetText()}", context);
return(null);
}
}
/// <summary>
/// Exit a parse tree produced by <see cref="GraphQLParser.operationDefinition"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitOperationDefinition([NotNull] GraphQLParser.OperationDefinitionContext context)
{
}
