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