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query_date_range.go
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/
query_date_range.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 (
"fmt"
"math"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/numeric_util"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/searchers"
)
type dateRangeQuery struct {
Start *string `json:"start,omitempty"`
End *string `json:"end,omitempty"`
InclusiveStart *bool `json:"inclusive_start,omitempty"`
InclusiveEnd *bool `json:"inclusive_end,omitempty"`
FieldVal string `json:"field,omitempty"`
BoostVal float64 `json:"boost,omitempty"`
}
// NewDateRangeQuery creates a new Query for ranges
// of date values.
// Date strings are parsed using the DateTimeParser configured in the
// top-level config.QueryDateTimeParser
// Either, but not both endpoints can be nil.
func NewDateRangeQuery(start, end *string) *dateRangeQuery {
return NewDateRangeInclusiveQuery(start, end, nil, nil)
}
// NewDateRangeInclusiveQuery creates a new Query for ranges
// of date values.
// Date strings are parsed using the DateTimeParser configured in the
// top-level config.QueryDateTimeParser
// Either, but not both endpoints can be nil.
// startInclusive and endInclusive control inclusion of the endpoints.
func NewDateRangeInclusiveQuery(start, end *string, startInclusive, endInclusive *bool) *dateRangeQuery {
return &dateRangeQuery{
Start: start,
End: end,
InclusiveStart: startInclusive,
InclusiveEnd: endInclusive,
BoostVal: 1.0,
}
}
func (q *dateRangeQuery) Boost() float64 {
return q.BoostVal
}
func (q *dateRangeQuery) SetBoost(b float64) Query {
q.BoostVal = b
return q
}
func (q *dateRangeQuery) Field() string {
return q.FieldVal
}
func (q *dateRangeQuery) SetField(f string) Query {
q.FieldVal = f
return q
}
func (q *dateRangeQuery) Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error) {
min, max, err := q.parseEndpoints()
if err != nil {
return nil, err
}
field := q.FieldVal
if q.FieldVal == "" {
field = m.DefaultField
}
return searchers.NewNumericRangeSearcher(i, min, max, q.InclusiveStart, q.InclusiveEnd, field, q.BoostVal, explain)
}
func (q *dateRangeQuery) parseEndpoints() (*float64, *float64, error) {
dateTimeParser, err := Config.Cache.DateTimeParserNamed(Config.QueryDateTimeParser)
if err != nil {
return nil, nil, err
}
// now parse the endpoints
min := math.Inf(-1)
max := math.Inf(1)
if q.Start != nil && *q.Start != "" {
startTime, err := dateTimeParser.ParseDateTime(*q.Start)
if err != nil {
return nil, nil, err
}
min = numeric_util.Int64ToFloat64(startTime.UnixNano())
}
if q.End != nil && *q.End != "" {
endTime, err := dateTimeParser.ParseDateTime(*q.End)
if err != nil {
return nil, nil, err
}
max = numeric_util.Int64ToFloat64(endTime.UnixNano())
}
return &min, &max, nil
}
func (q *dateRangeQuery) Validate() error {
if q.Start == nil && q.Start == q.End {
return fmt.Errorf("must specify start or end")
}
_, _, err := q.parseEndpoints()
if err != nil {
return err
}
return nil
}