Lightweight and fast SQL builder for Go language
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// Copyright 2016 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package builder
import "fmt"
// Not defines NOT condition
type Not [1]Cond
var _ Cond = Not{}
// WriteTo writes SQL to Writer
func (not Not) WriteTo(w Writer) error {
if _, err := fmt.Fprint(w, "NOT "); err != nil {
return err
}
switch not[0].(type) {
case condAnd, condOr:
if _, err := fmt.Fprint(w, "("); err != nil {
return err
}
case Eq:
if len(not[0].(Eq)) > 1 {
if _, err := fmt.Fprint(w, "("); err != nil {
return err
}
}
case Neq:
if len(not[0].(Neq)) > 1 {
if _, err := fmt.Fprint(w, "("); err != nil {
return err
}
}
}
if err := not[0].WriteTo(w); err != nil {
return err
}
switch not[0].(type) {
case condAnd, condOr:
if _, err := fmt.Fprint(w, ")"); err != nil {
return err
}
case Eq:
if len(not[0].(Eq)) > 1 {
if _, err := fmt.Fprint(w, ")"); err != nil {
return err
}
}
case Neq:
if len(not[0].(Neq)) > 1 {
if _, err := fmt.Fprint(w, ")"); err != nil {
return err
}
}
}
return nil
}
// And implements And with other conditions
func (not Not) And(conds ...Cond) Cond {
return And(not, And(conds...))
}
// Or implements Or with other conditions
func (not Not) Or(conds ...Cond) Cond {
return Or(not, Or(conds...))
}
// IsValid tests if this condition is valid
func (not Not) IsValid() bool {
return not[0] != nil && not[0].IsValid()
}