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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
// 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
}
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