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bleve/examples/bleve_query/main.go

97 lines
2.5 KiB
Go

// 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 main
import (
"flag"
"fmt"
"log"
"github.com/couchbaselabs/bleve/index/store/leveldb"
"github.com/couchbaselabs/bleve/index/upside_down"
"github.com/couchbaselabs/bleve/search"
)
var field = flag.String("field", "description", "field to query")
var indexDir = flag.String("indexDir", "index", "index directory")
var limit = flag.Int("limit", 10, "limit to first N results")
var includeHighlights = flag.Bool("highlight", false, "highlight matches")
func main() {
flag.Parse()
if flag.NArg() < 1 {
log.Fatal("Specify search term")
}
// open index
store, err := leveldb.Open(*indexDir)
if err != nil {
log.Fatal(err)
}
index := upside_down.NewUpsideDownCouch(store)
err = index.Open()
if err != nil {
log.Fatal(err)
}
defer index.Close()
tq := search.TermQuery{
Term: flag.Arg(0),
Field: *field,
BoostVal: 1.0,
Explain: true,
}
collector := search.NewTopScorerCollector(*limit)
searcher, err := tq.Searcher(index)
if err != nil {
log.Fatalf("searcher error: %v", err)
return
}
err = collector.Collect(searcher)
if err != nil {
log.Fatalf("search error: %v", err)
return
}
results := collector.Results()
if len(results) == 0 {
fmt.Printf("No matches\n")
} else {
last := uint64(*limit)
if searcher.Count() < last {
last = searcher.Count()
}
fmt.Printf("%d matches, showing %d through %d\n", searcher.Count(), 1, last)
for i, result := range results {
fmt.Printf("%2d. %s (%f)\n", i+1, result.ID, result.Score)
if *includeHighlights {
highlighter := search.NewSimpleHighlighter()
doc, err := index.Document(result.ID)
if err != nil {
fmt.Print(err)
return
}
fragments := highlighter.BestFragmentsInField(result, doc, *field, 5)
for _, fragment := range fragments {
fmt.Printf("\t%s\n", fragment)
}
if len(fragments) == 0 {
for _, f := range doc.Fields {
fmt.Printf("\tfield: %s\n", f)
}
}
}
}
}
}