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query.go
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/
query.go
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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 bleve
import (
"encoding/json"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
)
// A Query represents a description of the type
// and parameters for a query into the index.
type Query interface {
Boost() float64
SetBoost(b float64) Query
Field() string
SetField(f string) Query
Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error)
Validate() error
}
// ParseQuery deserializes a JSON representation of
// a Query object.
func ParseQuery(input []byte) (Query, error) {
var tmp map[string]interface{}
err := json.Unmarshal(input, &tmp)
if err != nil {
return nil, err
}
_, isMatchQuery := tmp["match"]
_, hasFuzziness := tmp["fuzziness"]
if hasFuzziness && !isMatchQuery {
var rv fuzzyQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, isTermQuery := tmp["term"]
if isTermQuery {
var rv termQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
if isMatchQuery {
var rv matchQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, isMatchPhraseQuery := tmp["match_phrase"]
if isMatchPhraseQuery {
var rv matchPhraseQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasMust := tmp["must"]
_, hasShould := tmp["should"]
_, hasMustNot := tmp["must_not"]
if hasMust || hasShould || hasMustNot {
var rv booleanQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasTerms := tmp["terms"]
if hasTerms {
var rv phraseQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
for _, tq := range rv.Terms {
if tq.Boost() == 0 {
tq.SetBoost(1)
}
}
return &rv, nil
}
_, hasConjuncts := tmp["conjuncts"]
if hasConjuncts {
var rv conjunctionQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasDisjuncts := tmp["disjuncts"]
if hasDisjuncts {
var rv disjunctionQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasSyntaxQuery := tmp["query"]
if hasSyntaxQuery {
var rv queryStringQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasMin := tmp["min"]
_, hasMax := tmp["max"]
if hasMin || hasMax {
var rv numericRangeQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasStart := tmp["start"]
_, hasEnd := tmp["end"]
if hasStart || hasEnd {
var rv dateRangeQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
_, hasPrefix := tmp["prefix"]
if hasPrefix {
var rv prefixQuery
err := json.Unmarshal(input, &rv)
if err != nil {
return nil, err
}
if rv.Boost() == 0 {
rv.SetBoost(1)
}
return &rv, nil
}
return nil, ErrorUnknownQueryType
}