Initial QSfera import

Server/vendor/github.com/invopop/validation/not_nil.go

@@ -0,0 +1,44 @@
+// Copyright 2016 Qiang Xue. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package validation
+
+// ErrNotNilRequired is the error that returns when a value is Nil.
+var ErrNotNilRequired = NewError("validation_not_nil_required", "is required")
+
+// NotNil is a validation rule that checks if a value is not nil.
+// NotNil only handles types including interface, pointer, slice, and map.
+// All other types are considered valid.
+var NotNil = notNilRule{}
+
+type notNilRule struct {
+	err Error
+}
+
+// Validate checks if the given value is valid or not.
+func (r notNilRule) Validate(value interface{}) error {
+	_, isNil := Indirect(value)
+	if isNil {
+		if r.err != nil {
+			return r.err
+		}
+		return ErrNotNilRequired
+	}
+	return nil
+}
+
+// Error sets the error message for the rule.
+func (r notNilRule) Error(message string) notNilRule {
+	if r.err == nil {
+		r.err = ErrNotNilRequired
+	}
+	r.err = r.err.SetMessage(message)
+	return r
+}
+
+// ErrorObject sets the error struct for the rule.
+func (r notNilRule) ErrorObject(err Error) notNilRule {
+	r.err = err
+	return r
+}