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offset.go
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offset.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/misc"
"github.com/couchbaselabs/tuqtng/network"
)
type Offset struct {
Base *BaseOperator
Offset int
count int
}
func NewOffset(offset int) *Offset {
return &Offset{
Base: NewBaseOperator(),
Offset: offset,
}
}
func (this *Offset) SetSource(source Operator) {
this.Base.SetSource(source)
}
func (this *Offset) GetChannels() (dparval.ValueChannel, PipelineSupportChannel) {
return this.Base.GetChannels()
}
func (this *Offset) Run(stopChannel misc.StopChannel) {
clog.To(CHANNEL, "offset operator starting")
this.Base.RunOperator(this, stopChannel)
clog.To(CHANNEL, "offset operator finished")
}
func (this *Offset) processItem(item *dparval.Value) bool {
this.count++
if this.count <= this.Offset {
return true
}
this.Base.SendItem(item)
return true
}
func (this *Offset) afterItems() {}
func (this *Offset) SetQuery(q network.Query) {
this.Base.SetQuery(q)
}