/
search_filter.go
103 lines (86 loc) · 2.54 KB
/
search_filter.go
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// Copyright (c) 2017 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 searcher
import (
"reflect"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/size"
)
var reflectStaticSizeFilteringSearcher int
func init() {
var fs FilteringSearcher
reflectStaticSizeFilteringSearcher = int(reflect.TypeOf(fs).Size())
}
// FilterFunc defines a function which can filter documents
// returning true means keep the document
// returning false means do not keep the document
type FilterFunc func(d *search.DocumentMatch) bool
// FilteringSearcher wraps any other searcher, but checks any Next/Advance
// call against the supplied FilterFunc
type FilteringSearcher struct {
child search.Searcher
accept FilterFunc
}
func NewFilteringSearcher(s search.Searcher, filter FilterFunc) *FilteringSearcher {
return &FilteringSearcher{
child: s,
accept: filter,
}
}
func (f *FilteringSearcher) Size() int {
return reflectStaticSizeFilteringSearcher + size.SizeOfPtr +
f.child.Size()
}
func (f *FilteringSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
next, err := f.child.Next(ctx)
for next != nil && err == nil {
if f.accept(next) {
return next, nil
}
next, err = f.child.Next(ctx)
}
return nil, err
}
func (f *FilteringSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
adv, err := f.child.Advance(ctx, ID)
if err != nil {
return nil, err
}
if adv == nil {
return nil, nil
}
if f.accept(adv) {
return adv, nil
}
return f.Next(ctx)
}
func (f *FilteringSearcher) Close() error {
return f.child.Close()
}
func (f *FilteringSearcher) Weight() float64 {
return f.child.Weight()
}
func (f *FilteringSearcher) SetQueryNorm(n float64) {
f.child.SetQueryNorm(n)
}
func (f *FilteringSearcher) Count() uint64 {
return f.child.Count()
}
func (f *FilteringSearcher) Min() int {
return f.child.Min()
}
func (f *FilteringSearcher) DocumentMatchPoolSize() int {
return f.child.DocumentMatchPoolSize()
}