github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/query/sql/tree/SortItem.go (about)

     1  //  Copyright (c) 2017-2018 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package tree
    16  
    17  // SortItem is SortItem
    18  type SortItem struct {
    19  	// Node is INode
    20  	INode
    21  	Expr  IExpression
    22  	Order OrderType
    23  }
    24  
    25  // OrderType is order type
    26  type OrderType int
    27  
    28  const (
    29  	// ASC is ASC
    30  	ASC OrderType = iota
    31  	// DESC is DESC
    32  	DESC
    33  )
    34  
    35  // OrderTypes is order type strings
    36  var OrderTypes = [...]string{
    37  	"ASC",
    38  	"DESC",
    39  }
    40  
    41  // NewSortItem creates SortItem
    42  func NewSortItem(location *NodeLocation, expr IExpression, order OrderType) *SortItem {
    43  	return &SortItem{
    44  		NewNode(location),
    45  		expr,
    46  		order,
    47  	}
    48  }
    49  
    50  // Accept accepts visitor
    51  func (q *SortItem) Accept(visitor AstVisitor, ctx interface{}) interface{} {
    52  	return visitor.VisitSortItem(q, ctx)
    53  }