2968d3538a
removed analyzers (these are now built as needed through config) removed html chacter filter (now built as needed through config) added missing license header changed constructor signature of filters that cannot return errors filter constructors that can have errors, now have Must variant which panics change cdl2 tokenizer into filter (should only see lower-case input) new top level index api, closes #5 refactored index tests to not rely directly on analyzers moved query objects to top-level new top level search api, closes #12 top score collector allows skipping results index mapping supports _all by default, closes #3 and closes #6 index mapping supports disabled sections, closes #7 new http sub package with reusable http.Handler's, closes #22
101 lines
2.5 KiB
Go
101 lines
2.5 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 search
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import (
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"fmt"
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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 *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([]*Explanation, 2)
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childrenExplanations[0] = &Explanation{
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Value: s.boost,
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Message: "boost",
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}
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childrenExplanations[1] = &Explanation{
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Value: s.queryNorm,
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Message: "queryNorm",
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}
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s.queryWeightExplanation = &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 string) *DocumentMatch {
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var scoreExplanation *Explanation
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score := s.constant
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if s.explain {
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scoreExplanation = &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([]*Explanation, 2)
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childExplanations[0] = s.queryWeightExplanation
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childExplanations[1] = scoreExplanation
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scoreExplanation = &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 := DocumentMatch{
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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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