/// <summary>
/// Converts a normalized method call expression into the appropriate ParseQuery clause.
/// </summary>
private static ParseQuery <T> WhereMethodCall <T>(
this ParseQuery <T> source, Expression <Func <T, bool> > expression, MethodCallExpression node)
where T : ParseObject
{
if (IsParseObjectGet(node) && (node.Type == typeof(bool) || node.Type == typeof(bool?)))
{
// This is a raw boolean field access like 'where obj.Get<bool>("foo")'
return(source.WhereEqualTo(GetValue(node.Arguments[0]) as string, true));
}
MethodInfo translatedMethod;
if (functionMappings.TryGetValue(node.Method, out translatedMethod))
{
var objTransformed = new ObjectNormalizer().Visit(node.Object) as MethodCallExpression;
if (!(IsParseObjectGet(objTransformed) &&
objTransformed.Object == expression.Parameters[0]))
{
throw new InvalidOperationException(
"The left-hand side of a supported function call must be a ParseObject field access.");
}
var fieldPath = GetValue(objTransformed.Arguments[0]);
var containedIn = GetValue(node.Arguments[0]);
var queryType = translatedMethod.DeclaringType.GetGenericTypeDefinition()
.MakeGenericType(typeof(T));
translatedMethod = ReflectionHelpers.GetMethod(queryType,
translatedMethod.Name,
translatedMethod.GetParameters().Select(p => p.ParameterType).ToArray());
return(translatedMethod.Invoke(source, new[] { fieldPath, containedIn }) as ParseQuery <T>);
}
if (node.Arguments[0] == expression.Parameters[0])
{
// obj.ContainsKey("foo") --> query.WhereExists("foo")
if (node.Method == containsKeyMethod)
{
return(source.WhereExists(GetValue(node.Arguments[1]) as string));
}
// !obj.ContainsKey("foo") --> query.WhereDoesNotExist("foo")
if (node.Method == notContainsKeyMethod)
{
return(source.WhereDoesNotExist(GetValue(node.Arguments[1]) as string));
}
}
if (node.Method.IsGenericMethod)
{
if (node.Method.GetGenericMethodDefinition() == containsMethod)
{
// obj.Get<IList<T>>("path").Contains(someValue)
if (IsParseObjectGet(node.Arguments[0] as MethodCallExpression))
{
return(source.WhereEqualTo(
GetValue(((MethodCallExpression)node.Arguments[0]).Arguments[0]) as string,
GetValue(node.Arguments[1])));
}
// someList.Contains(obj.Get<T>("path"))
if (IsParseObjectGet(node.Arguments[1] as MethodCallExpression))
{
var collection = GetValue(node.Arguments[0]) as System.Collections.IEnumerable;
return(source.WhereContainedIn(
GetValue(((MethodCallExpression)node.Arguments[1]).Arguments[0]) as string,
collection.Cast <object>()));
}
}
if (node.Method.GetGenericMethodDefinition() == notContainsMethod)
{
// !obj.Get<IList<T>>("path").Contains(someValue)
if (IsParseObjectGet(node.Arguments[0] as MethodCallExpression))
{
return(source.WhereNotEqualTo(
GetValue(((MethodCallExpression)node.Arguments[0]).Arguments[0]) as string,
GetValue(node.Arguments[1])));
}
// !someList.Contains(obj.Get<T>("path"))
if (IsParseObjectGet(node.Arguments[1] as MethodCallExpression))
{
var collection = GetValue(node.Arguments[0]) as System.Collections.IEnumerable;
return(source.WhereNotContainedIn(
GetValue(((MethodCallExpression)node.Arguments[1]).Arguments[0]) as string,
collection.Cast <object>()));
}
}
}
throw new InvalidOperationException(node.Method + " is not a supported method call in a where expression.");
}