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scorer_disjunction.go
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/
scorer_disjunction.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 scorer
import (
"fmt"
"reflect"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/size"
)
var reflectStaticSizeDisjunctionQueryScorer int
func init() {
var dqs DisjunctionQueryScorer
reflectStaticSizeDisjunctionQueryScorer = int(reflect.TypeOf(dqs).Size())
}
type DisjunctionQueryScorer struct {
options search.SearcherOptions
}
func (s *DisjunctionQueryScorer) Size() int {
return reflectStaticSizeDisjunctionQueryScorer + size.SizeOfPtr
}
func NewDisjunctionQueryScorer(options search.SearcherOptions) *DisjunctionQueryScorer {
return &DisjunctionQueryScorer{
options: options,
}
}
func (s *DisjunctionQueryScorer) Score(ctx *search.SearchContext, constituents []*search.DocumentMatch, countMatch, countTotal int) *search.DocumentMatch {
var sum float64
var childrenExplanations []*search.Explanation
if s.options.Explain {
childrenExplanations = make([]*search.Explanation, len(constituents))
}
for i, docMatch := range constituents {
sum += docMatch.Score
if s.options.Explain {
childrenExplanations[i] = docMatch.Expl
}
}
var rawExpl *search.Explanation
if s.options.Explain {
rawExpl = &search.Explanation{Value: sum, Message: "sum of:", Children: childrenExplanations}
}
coord := float64(countMatch) / float64(countTotal)
newScore := sum * coord
var newExpl *search.Explanation
if s.options.Explain {
ce := make([]*search.Explanation, 2)
ce[0] = rawExpl
ce[1] = &search.Explanation{Value: coord, Message: fmt.Sprintf("coord(%d/%d)", countMatch, countTotal)}
newExpl = &search.Explanation{Value: newScore, Message: "product of:", Children: ce}
}
// reuse constituents[0] as the return value
rv := constituents[0]
rv.Score = newScore
rv.Expl = newExpl
rv.FieldTermLocations = search.MergeFieldTermLocations(
rv.FieldTermLocations, constituents[1:])
return rv
}