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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 facet
import (
"sort"
"github.com/blevesearch/bleve/search"
)
type TermsFacetBuilder struct {
size int
field string
termsCount map[string]int
total int
missing int
sawValue bool
}
func NewTermsFacetBuilder(field string, size int) *TermsFacetBuilder {
return &TermsFacetBuilder{
size: size,
field: field,
termsCount: make(map[string]int),
}
}
func (fb *TermsFacetBuilder) Field() string {
return fb.field
}
func (fb *TermsFacetBuilder) UpdateVisitor(field string, term []byte) {
if field == fb.field {
fb.sawValue = true
fb.termsCount[string(term)] = fb.termsCount[string(term)] + 1
fb.total++
}
}
func (fb *TermsFacetBuilder) StartDoc() {
fb.sawValue = false
}
func (fb *TermsFacetBuilder) EndDoc() {
if !fb.sawValue {
fb.missing++
}
}
func (fb *TermsFacetBuilder) Result() *search.FacetResult {
rv := search.FacetResult{
Field: fb.field,
Total: fb.total,
Missing: fb.missing,
}
rv.Terms = make([]*search.TermFacet, 0, len(fb.termsCount))
for term, count := range fb.termsCount {
tf := &search.TermFacet{
Term: term,
Count: count,
}
rv.Terms = append(rv.Terms, tf)
}
sort.Sort(rv.Terms)
// we now have the list of the top N facets
trimTopN := fb.size
if trimTopN > len(rv.Terms) {
trimTopN = len(rv.Terms)
}
rv.Terms = rv.Terms[:trimTopN]
notOther := 0
for _, tf := range rv.Terms {
notOther += tf.Count
}
rv.Other = fb.total - notOther
return &rv
}
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