Initial QSfera import

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

@@ -0,0 +1,67 @@
+// 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
+
+var (
+	// ErrNil is the error that returns when a value is not nil.
+	ErrNil = NewError("validation_nil", "must be blank")
+	// ErrEmpty is the error that returns when a not nil value is not empty.
+	ErrEmpty = NewError("validation_empty", "must be blank")
+)
+
+// Nil is a validation rule that checks if a value is nil.
+// It is the opposite of NotNil rule
+var Nil = absentRule{condition: true, skipNil: false}
+
+// Empty checks if a not nil value is empty.
+var Empty = absentRule{condition: true, skipNil: true}
+
+type absentRule struct {
+	condition bool
+	err       Error
+	skipNil   bool
+}
+
+// Validate checks if the given value is valid or not.
+func (r absentRule) Validate(value interface{}) error {
+	if r.condition {
+		value, isNil := Indirect(value)
+		if !r.skipNil && !isNil || r.skipNil && !isNil && !IsEmpty(value) {
+			if r.err != nil {
+				return r.err
+			}
+			if r.skipNil {
+				return ErrEmpty
+			}
+			return ErrNil
+		}
+	}
+	return nil
+}
+
+// When sets the condition that determines if the validation should be performed.
+func (r absentRule) When(condition bool) absentRule {
+	r.condition = condition
+	return r
+}
+
+// Error sets the error message for the rule.
+func (r absentRule) Error(message string) absentRule {
+	if r.err == nil {
+		if r.skipNil {
+			r.err = ErrEmpty
+		} else {
+			r.err = ErrNil
+		}
+	}
+	r.err = r.err.SetMessage(message)
+	return r
+}
+
+// ErrorObject sets the error struct for the rule.
+func (r absentRule) ErrorObject(err Error) absentRule {
+	r.err = err
+	return r
+}