e188fe35f7
instead of separate DocumentMatch/DocumentMatchInternal rules are simple, everything operates on the IndexInternalID field until the results are returned, then ID is set correctly the IndexInternalID field is not exported to JSON
105 lines
2.6 KiB
Go
105 lines
2.6 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 scorers
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import (
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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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)
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type ConstantScorer struct {
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constant float64
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boost float64
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explain bool
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queryNorm float64
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queryWeight float64
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queryWeightExplanation *search.Explanation
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}
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func NewConstantScorer(constant float64, boost float64, explain bool) *ConstantScorer {
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rv := ConstantScorer{
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explain: explain,
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queryWeight: 1.0,
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constant: constant,
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boost: boost,
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}
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return &rv
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}
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func (s *ConstantScorer) Weight() float64 {
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sum := s.boost
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return sum * sum
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}
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func (s *ConstantScorer) SetQueryNorm(qnorm float64) {
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s.queryNorm = qnorm
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// update the query weight
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s.queryWeight = s.boost * s.queryNorm
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if s.explain {
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childrenExplanations := make([]*search.Explanation, 2)
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childrenExplanations[0] = &search.Explanation{
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Value: s.boost,
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Message: "boost",
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}
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childrenExplanations[1] = &search.Explanation{
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Value: s.queryNorm,
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Message: "queryNorm",
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}
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s.queryWeightExplanation = &search.Explanation{
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Value: s.queryWeight,
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Message: fmt.Sprintf("ConstantScore()^%f, product of:", s.boost),
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Children: childrenExplanations,
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}
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}
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}
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func (s *ConstantScorer) Score(id index.IndexInternalID) *search.DocumentMatch {
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var scoreExplanation *search.Explanation
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score := s.constant
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if s.explain {
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scoreExplanation = &search.Explanation{
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Value: score,
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Message: fmt.Sprintf("ConstantScore()"),
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}
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}
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// if the query weight isn't 1, multiply
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if s.queryWeight != 1.0 {
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score = score * s.queryWeight
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if s.explain {
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childExplanations := make([]*search.Explanation, 2)
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childExplanations[0] = s.queryWeightExplanation
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childExplanations[1] = scoreExplanation
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scoreExplanation = &search.Explanation{
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Value: score,
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Message: fmt.Sprintf("weight(^%f), product of:", s.boost),
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Children: childExplanations,
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}
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}
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}
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rv := search.DocumentMatch{
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IndexInternalID: id,
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Score: score,
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}
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if s.explain {
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rv.Expl = scoreExplanation
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}
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return &rv
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}
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