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document_join.go
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document_join.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 xpipeline
import (
"github.com/couchbaselabs/clog"
"github.com/couchbaselabs/dparval"
"github.com/couchbaselabs/tuqtng/ast"
"github.com/couchbaselabs/tuqtng/misc"
"github.com/couchbaselabs/tuqtng/network"
"github.com/couchbaselabs/tuqtng/query"
)
type DocumentJoin struct {
Base *BaseOperator
Over ast.Expression
As string
}
func NewDocumentJoin(over ast.Expression, as string) *DocumentJoin {
return &DocumentJoin{
Base: NewBaseOperator(),
Over: over,
As: as,
}
}
func (this *DocumentJoin) SetSource(source Operator) {
this.Base.SetSource(source)
}
func (this *DocumentJoin) GetChannels() (dparval.ValueChannel, PipelineSupportChannel) {
return this.Base.GetChannels()
}
func (this *DocumentJoin) Run(stopChannel misc.StopChannel) {
clog.To(CHANNEL, "document join operator starting")
this.Base.RunOperator(this, stopChannel)
clog.To(CHANNEL, "document join operator finished")
}
func (this *DocumentJoin) processItem(item *dparval.Value) bool {
val, err := this.Base.Evaluate(this.Over, item)
if err != nil {
switch err := err.(type) {
case *dparval.Undefined:
return true
default:
return this.Base.SendError(query.NewError(err, "Internal Error"))
}
}
if val.Type() == dparval.ARRAY {
ok := true
index := 0
for ok {
inner, err := val.Index(index)
index = index + 1
if err != nil {
switch err := err.(type) {
case *dparval.Undefined:
ok = false
default:
this.Base.SendError(query.NewError(err, "Internal Error"))
return false
}
} else {
newItem := item.Duplicate()
newItem.SetPath(this.As, inner)
this.Base.SendItem(newItem)
}
}
}
return true
}
func (this *DocumentJoin) afterItems() {}
func (this *DocumentJoin) SetQuery(q network.Query) {
this.Base.SetQuery(q)
}