134 lines
3.9 KiB
Go
134 lines
3.9 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package query
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import (
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"fmt"
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"math"
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"github.com/blevesearch/bleve/analysis/datetime_parsers/datetime_optional"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/mapping"
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"github.com/blevesearch/bleve/numeric_util"
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"github.com/blevesearch/bleve/registry"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/search/searchers"
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)
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// QueryDateTimeParser controls the default query date time parser
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var QueryDateTimeParser = datetime_optional.Name
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var cache = registry.NewCache()
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type DateRangeQuery struct {
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Start *string `json:"start,omitempty"`
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End *string `json:"end,omitempty"`
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InclusiveStart *bool `json:"inclusive_start,omitempty"`
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InclusiveEnd *bool `json:"inclusive_end,omitempty"`
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FieldVal string `json:"field,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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}
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// NewDateRangeQuery creates a new Query for ranges
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// of date values.
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// Date strings are parsed using the DateTimeParser configured in the
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// top-level config.QueryDateTimeParser
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// Either, but not both endpoints can be nil.
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func NewDateRangeQuery(start, end *string) *DateRangeQuery {
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return NewDateRangeInclusiveQuery(start, end, nil, nil)
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}
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// NewDateRangeInclusiveQuery creates a new Query for ranges
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// of date values.
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// Date strings are parsed using the DateTimeParser configured in the
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// top-level config.QueryDateTimeParser
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// Either, but not both endpoints can be nil.
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// startInclusive and endInclusive control inclusion of the endpoints.
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func NewDateRangeInclusiveQuery(start, end *string, startInclusive, endInclusive *bool) *DateRangeQuery {
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return &DateRangeQuery{
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Start: start,
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End: end,
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InclusiveStart: startInclusive,
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InclusiveEnd: endInclusive,
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BoostVal: 1.0,
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}
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}
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func (q *DateRangeQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *DateRangeQuery) SetBoost(b float64) Query {
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q.BoostVal = b
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return q
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}
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func (q *DateRangeQuery) Field() string {
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return q.FieldVal
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}
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func (q *DateRangeQuery) SetField(f string) Query {
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q.FieldVal = f
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return q
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}
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func (q *DateRangeQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, explain bool) (search.Searcher, error) {
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min, max, err := q.parseEndpoints()
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if err != nil {
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return nil, err
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}
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field := q.FieldVal
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if q.FieldVal == "" {
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field = m.DefaultSearchField()
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}
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return searchers.NewNumericRangeSearcher(i, min, max, q.InclusiveStart, q.InclusiveEnd, field, q.BoostVal, explain)
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}
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func (q *DateRangeQuery) parseEndpoints() (*float64, *float64, error) {
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dateTimeParser, err := cache.DateTimeParserNamed(QueryDateTimeParser)
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if err != nil {
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return nil, nil, err
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}
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// now parse the endpoints
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min := math.Inf(-1)
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max := math.Inf(1)
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if q.Start != nil && *q.Start != "" {
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startTime, err := dateTimeParser.ParseDateTime(*q.Start)
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if err != nil {
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return nil, nil, err
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}
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min = numeric_util.Int64ToFloat64(startTime.UnixNano())
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}
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if q.End != nil && *q.End != "" {
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endTime, err := dateTimeParser.ParseDateTime(*q.End)
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if err != nil {
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return nil, nil, err
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}
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max = numeric_util.Int64ToFloat64(endTime.UnixNano())
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}
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return &min, &max, nil
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}
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func (q *DateRangeQuery) Validate() error {
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if q.Start == nil && q.Start == q.End {
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return fmt.Errorf("must specify start or end")
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}
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_, _, err := q.parseEndpoints()
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if err != nil {
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return err
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}
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return nil
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}
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