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61 lines
1.0 KiB
61 lines
1.0 KiB
// 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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type condAnd []Cond
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var _ Cond = condAnd{}
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// And generates AND conditions
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func And(conds ...Cond) Cond {
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var result = make(condAnd, 0, len(conds))
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for _, cond := range conds {
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if cond == nil || !cond.IsValid() {
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continue
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}
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result = append(result, cond)
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}
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return result
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}
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func (and condAnd) WriteTo(w Writer) error {
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for i, cond := range and {
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_, isOr := cond.(condOr)
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_, isExpr := cond.(expr)
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wrap := isOr || isExpr
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if wrap {
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fmt.Fprint(w, "(")
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}
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err := cond.WriteTo(w)
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if err != nil {
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return err
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}
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if wrap {
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fmt.Fprint(w, ")")
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}
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if i != len(and)-1 {
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fmt.Fprint(w, " AND ")
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}
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}
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return nil
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}
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func (and condAnd) And(conds ...Cond) Cond {
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return And(and, And(conds...))
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}
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func (and condAnd) Or(conds ...Cond) Cond {
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return Or(and, Or(conds...))
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}
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func (and condAnd) IsValid() bool {
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return len(and) > 0
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}
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