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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 query

import (
	"github.com/blevesearch/bleve/v2/mapping"
	"github.com/blevesearch/bleve/v2/search"
	"github.com/blevesearch/bleve/v2/search/searcher"
	index "github.com/blevesearch/bleve_index_api"
)

type TermQuery struct {
	Term     string `json:"term"`
	FieldVal string `json:"field,omitempty"`
	BoostVal *Boost `json:"boost,omitempty"`
}

// NewTermQuery creates a new Query for finding an
// exact term match in the index.
func NewTermQuery(term string) *TermQuery {
	return &TermQuery{
		Term: term,
	}
}

func (q *TermQuery) SetBoost(b float64) {
	boost := Boost(b)
	q.BoostVal = &boost
}

func (q *TermQuery) Boost() float64 {
	return q.BoostVal.Value()
}

func (q *TermQuery) SetField(f string) {
	q.FieldVal = f
}

func (q *TermQuery) Field() string {
	return q.FieldVal
}

func (q *TermQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
	field := q.FieldVal
	if q.FieldVal == "" {
		field = m.DefaultSearchField()
	}
	return searcher.NewTermSearcher(i, q.Term, field, q.BoostVal.Value(), options)
}