github.com/yongjacky/phoenix-go-orm-builder@v0.3.5/cond_and.go (about)

     1  // Copyright 2016 The Xorm Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package builder
     6  
     7  import "fmt"
     8  
     9  type condAnd []Cond
    10  
    11  var _ Cond = condAnd{}
    12  
    13  // And generates AND conditions
    14  func And(conds ...Cond) Cond {
    15  	var result = make(condAnd, 0, len(conds))
    16  	for _, cond := range conds {
    17  		if cond == nil || !cond.IsValid() {
    18  			continue
    19  		}
    20  		result = append(result, cond)
    21  	}
    22  	return result
    23  }
    24  
    25  func (and condAnd) WriteTo(w Writer) error {
    26  	for i, cond := range and {
    27  		_, isOr := cond.(condOr)
    28  		_, isExpr := cond.(expr)
    29  		wrap := isOr || isExpr
    30  		if wrap {
    31  			fmt.Fprint(w, "(")
    32  		}
    33  
    34  		err := cond.WriteTo(w)
    35  		if err != nil {
    36  			return err
    37  		}
    38  
    39  		if wrap {
    40  			fmt.Fprint(w, ")")
    41  		}
    42  
    43  		if i != len(and)-1 {
    44  			fmt.Fprint(w, " AND ")
    45  		}
    46  	}
    47  
    48  	return nil
    49  }
    50  
    51  func (and condAnd) And(conds ...Cond) Cond {
    52  	return And(and, And(conds...))
    53  }
    54  
    55  func (and condAnd) Or(conds ...Cond) Cond {
    56  	return Or(and, Or(conds...))
    57  }
    58  
    59  func (and condAnd) IsValid() bool {
    60  	return len(and) > 0
    61  }