5aa9e95468
index id's are now opaque (until finally returned to top-level user)
- the TermFieldDoc's returned by TermFieldReader no longer contain doc id
- instead they return an opaque IndexInternalID
- items returned are still in the "natural index order"
- but that is no longer guaranteed to be "doc id order"
- correct behavior requires that they all follow the same order
- but not any particular order
- new API FinalizeDocID which converts index internal ID's to public string ID
- APIs used internally which previously took doc id now take IndexInternalID
- that is DocumentFieldTerms() and DocumentFieldTermsForFields()
- however, APIs that are used externally do not reflect this change
- that is Document()
- DocumentIDReader follows the same changes, but this is less obvious
- behavior clarified, used to iterate doc ids, BUT NOT in doc id order
- method STILL available to iterate doc ids in range
- but again, you won't get them in any meaningful order
- new method to iterate actual doc ids from list of possible ids
- this was introduced to make the DocIDSearcher continue working
searchers now work with the new opaque index internal doc ids
- they return new DocumentMatchInternal (which does not have string ID)
scorerers also work with these opaque index internal doc ids
- they return DocumentMatchInternal (which does not have string ID)
collectors now also perform a final step of converting the final result
- they STILL return traditional DocumentMatch (with string ID)
- but they now also require an IndexReader (so that they can do the conversion)
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.DocumentMatchInternal {
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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.DocumentMatchInternal{
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ID: 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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