55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package upside_down
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type termSummaryIncr struct{}
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func newTermSummaryIncr() *termSummaryIncr {
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return &termSummaryIncr{}
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}
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func (t *termSummaryIncr) Merge(key, existing []byte) ([]byte, error) {
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if len(existing) > 0 {
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tfr, err := NewTermFrequencyRowKV(key, existing)
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if err != nil {
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return nil, err
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}
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tfr.freq++
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return tfr.Value(), nil
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} else {
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tfr, err := NewTermFrequencyRowK(key)
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if err != nil {
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return nil, err
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}
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tfr.freq = 1
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return tfr.Value(), nil
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}
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}
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type termSummaryDecr struct{}
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func newTermSummaryDecr() *termSummaryDecr {
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return &termSummaryDecr{}
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}
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func (t *termSummaryDecr) Merge(key, existing []byte) ([]byte, error) {
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if len(existing) > 0 {
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tfr, err := NewTermFrequencyRowKV(key, existing)
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if err != nil {
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return nil, err
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}
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tfr.freq--
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if tfr.freq > 0 {
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return tfr.Value(), nil
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}
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}
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return nil, nil
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}
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