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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 (
"github.com/blevesearch/bleve/search"
)
type ConjunctionQueryScorer struct {
options search.SearcherOptions
}
func NewConjunctionQueryScorer(options search.SearcherOptions) *ConjunctionQueryScorer {
return &ConjunctionQueryScorer{
options: options,
}
}
func (s *ConjunctionQueryScorer) Score(ctx *search.SearchContext, constituents []*search.DocumentMatch) *search.DocumentMatch {
var sum float64
var childrenExplanations []*search.Explanation
if s.options.Explain {
childrenExplanations = make([]*search.Explanation, len(constituents))
}
locations := []search.FieldTermLocationMap{}
for i, docMatch := range constituents {
sum += docMatch.Score
if s.options.Explain {
childrenExplanations[i] = docMatch.Expl
}
if docMatch.Locations != nil {
locations = append(locations, docMatch.Locations)
}
}
newScore := sum
var newExpl *search.Explanation
if s.options.Explain {
newExpl = &search.Explanation{Value: sum, Message: "sum of:", Children: childrenExplanations}
}
// reuse constituents[0] as the return value
rv := constituents[0]
rv.Score = newScore
rv.Expl = newExpl
if len(locations) == 1 {
rv.Locations = locations[0]
} else if len(locations) > 1 {
rv.Locations = search.MergeLocations(locations)
}
return rv
}
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