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collection.go
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collection.go
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// Copyright (c) 2013 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package ast
import (
"fmt"
)
type CollectionOperator struct {
operator string
Condition Expression `json:"condition"`
Over Expression `json:"over"`
As string `json:"as"`
Output Expression `json:"output"`
}
func (this *CollectionOperator) Dependencies() ExpressionList {
rv := ExpressionList{this.Over}
if this.Condition != nil {
rv = append(rv, this.Condition)
}
if this.Output != nil {
rv = append(rv, this.Output)
}
return rv
}
func (this *CollectionOperator) EquivalentTo(t Expression) bool {
// another collection operator?
that, ok := t.(CollectionOperatorExpression)
if !ok {
return false
}
// same type of operator?
if this.operator != that.Operator() {
return false
}
if this.As != that.GetAs() {
return false
}
if !this.Over.EquivalentTo(that.GetOver()) {
return false
}
if this.Condition == nil && that.GetCondition() != nil {
return false
}
if !this.Condition.EquivalentTo(that.GetCondition()) {
return false
}
if this.Output == nil && that.GetOutput() != nil {
return false
}
if !this.Output.EquivalentTo(that.GetOutput()) {
return false
}
return true
}
func (this *CollectionOperator) String() string {
rv := this.operator
if this.Output != nil {
rv = rv + fmt.Sprintf(" %v", this.Output)
if this.Condition != nil {
rv = rv + fmt.Sprintf(" WHEN %v", this.Condition)
}
} else if this.Condition != nil {
rv = rv + fmt.Sprintf(" %v", this.Condition)
}
return rv + fmt.Sprintf(" OVER %v AS %s", this.Over, this.As)
}
func (this *CollectionOperator) Operator() string {
return this.operator
}
func (this *CollectionOperator) GetOver() Expression {
return this.Over
}
func (this *CollectionOperator) GetCondition() Expression {
return this.Condition
}
func (this *CollectionOperator) GetAs() string {
return this.As
}
func (this *CollectionOperator) SetOver(over Expression) {
this.Over = over
}
func (this *CollectionOperator) SetCondition(condition Expression) {
this.Condition = condition
}
func (this *CollectionOperator) SetAs(as string) {
this.As = as
}
func (this *CollectionOperator) GetOutput() Expression {
return this.Output
}
func (this *CollectionOperator) SetOutput(output Expression) {
this.Output = output
}