forked from xorm/builder
39 lines
685 B
Go
39 lines
685 B
Go
// 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
|
|
|
|
// Cond defines an interface
|
|
type Cond interface {
|
|
WriteTo(Writer) error
|
|
And(...Cond) Cond
|
|
Or(...Cond) Cond
|
|
IsValid() bool
|
|
}
|
|
|
|
type condEmpty struct{}
|
|
|
|
var _ Cond = condEmpty{}
|
|
|
|
// NewCond creates an empty condition
|
|
func NewCond() Cond {
|
|
return condEmpty{}
|
|
}
|
|
|
|
func (condEmpty) WriteTo(w Writer) error {
|
|
return nil
|
|
}
|
|
|
|
func (condEmpty) And(conds ...Cond) Cond {
|
|
return And(conds...)
|
|
}
|
|
|
|
func (condEmpty) Or(conds ...Cond) Cond {
|
|
return Or(conds...)
|
|
}
|
|
|
|
func (condEmpty) IsValid() bool {
|
|
return false
|
|
}
|