forked from blevesearch/bleve
/
row_merge.go
54 lines (47 loc) · 1.43 KB
/
row_merge.go
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// Copyright (c) 2014 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 upside_down
type termSummaryIncr struct{}
func newTermSummaryIncr() *termSummaryIncr {
return &termSummaryIncr{}
}
func (t *termSummaryIncr) Merge(key, existing []byte) ([]byte, error) {
if len(existing) > 0 {
tfr, err := NewTermFrequencyRowKV(key, existing)
if err != nil {
return nil, err
}
tfr.freq++
return tfr.Value(), nil
} else {
tfr, err := NewTermFrequencyRowK(key)
if err != nil {
return nil, err
}
tfr.freq = 1
return tfr.Value(), nil
}
}
type termSummaryDecr struct{}
func newTermSummaryDecr() *termSummaryDecr {
return &termSummaryDecr{}
}
func (t *termSummaryDecr) Merge(key, existing []byte) ([]byte, error) {
if len(existing) > 0 {
tfr, err := NewTermFrequencyRowKV(key, existing)
if err != nil {
return nil, err
}
tfr.freq--
if tfr.freq > 0 {
return tfr.Value(), nil
}
}
return nil, nil
}