118 lines
2.5 KiB
Go
118 lines
2.5 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package facet
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import (
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"reflect"
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"sort"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/size"
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)
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var reflectStaticSizeTermsFacetBuilder int
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func init() {
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var tfb TermsFacetBuilder
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reflectStaticSizeTermsFacetBuilder = int(reflect.TypeOf(tfb).Size())
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}
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type TermsFacetBuilder struct {
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size int
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field string
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termsCount map[string]int
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total int
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missing int
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sawValue bool
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}
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func NewTermsFacetBuilder(field string, size int) *TermsFacetBuilder {
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return &TermsFacetBuilder{
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size: size,
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field: field,
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termsCount: make(map[string]int),
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}
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}
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func (fb *TermsFacetBuilder) Size() int {
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sizeInBytes := reflectStaticSizeTermsFacetBuilder + size.SizeOfPtr +
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len(fb.field)
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for k, _ := range fb.termsCount {
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sizeInBytes += size.SizeOfString + len(k) +
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size.SizeOfInt
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}
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return sizeInBytes
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}
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func (fb *TermsFacetBuilder) Field() string {
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return fb.field
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}
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func (fb *TermsFacetBuilder) UpdateVisitor(field string, term []byte) {
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if field == fb.field {
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fb.sawValue = true
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fb.termsCount[string(term)] = fb.termsCount[string(term)] + 1
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fb.total++
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}
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}
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func (fb *TermsFacetBuilder) StartDoc() {
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fb.sawValue = false
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}
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func (fb *TermsFacetBuilder) EndDoc() {
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if !fb.sawValue {
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fb.missing++
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}
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}
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func (fb *TermsFacetBuilder) Result() *search.FacetResult {
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rv := search.FacetResult{
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Field: fb.field,
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Total: fb.total,
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Missing: fb.missing,
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}
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rv.Terms = make([]*search.TermFacet, 0, len(fb.termsCount))
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for term, count := range fb.termsCount {
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tf := &search.TermFacet{
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Term: term,
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Count: count,
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}
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rv.Terms = append(rv.Terms, tf)
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}
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sort.Sort(rv.Terms)
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// we now have the list of the top N facets
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trimTopN := fb.size
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if trimTopN > len(rv.Terms) {
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trimTopN = len(rv.Terms)
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}
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rv.Terms = rv.Terms[:trimTopN]
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notOther := 0
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for _, tf := range rv.Terms {
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notOther += tf.Count
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}
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rv.Other = fb.total - notOther
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return &rv
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}
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