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165 lines
4.5 KiB
165 lines
4.5 KiB
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package query
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import (
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"encoding/json"
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"fmt"
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"math"
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"time"
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"github.com/blevesearch/bleve/analysis/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"
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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/searcher"
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)
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// QueryDateTimeParser controls the default query date time parser
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var QueryDateTimeParser = optional.Name
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// QueryDateTimeFormat controls the format when Marshaling to JSON
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var QueryDateTimeFormat = time.RFC3339
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var cache = registry.NewCache()
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type BleveQueryTime struct {
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time.Time
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}
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func queryTimeFromString(t string) (time.Time, error) {
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dateTimeParser, err := cache.DateTimeParserNamed(QueryDateTimeParser)
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if err != nil {
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return time.Time{}, err
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}
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rv, err := dateTimeParser.ParseDateTime(t)
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if err != nil {
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return time.Time{}, err
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}
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return rv, nil
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}
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func (t *BleveQueryTime) MarshalJSON() ([]byte, error) {
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tt := time.Time(t.Time)
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return []byte("\"" + tt.Format(QueryDateTimeFormat) + "\""), nil
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}
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func (t *BleveQueryTime) UnmarshalJSON(data []byte) error {
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var timeString string
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err := json.Unmarshal(data, &timeString)
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if err != nil {
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return err
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}
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dateTimeParser, err := cache.DateTimeParserNamed(QueryDateTimeParser)
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if err != nil {
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return err
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}
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t.Time, err = dateTimeParser.ParseDateTime(timeString)
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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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type DateRangeQuery struct {
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Start BleveQueryTime `json:"start,omitempty"`
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End BleveQueryTime `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 *Boost `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 time.Time) *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 time.Time, startInclusive, endInclusive *bool) *DateRangeQuery {
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return &DateRangeQuery{
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Start: BleveQueryTime{start},
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End: BleveQueryTime{end},
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InclusiveStart: startInclusive,
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InclusiveEnd: endInclusive,
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}
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}
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func (q *DateRangeQuery) SetBoost(b float64) {
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boost := Boost(b)
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q.BoostVal = &boost
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}
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func (q *DateRangeQuery) Boost() float64{
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return q.BoostVal.Value()
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}
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func (q *DateRangeQuery) SetField(f string) {
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q.FieldVal = f
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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) 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 searcher.NewNumericRangeSearcher(i, min, max, q.InclusiveStart, q.InclusiveEnd, field, q.BoostVal.Value(), explain)
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}
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func (q *DateRangeQuery) parseEndpoints() (*float64, *float64, error) {
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min := math.Inf(-1)
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max := math.Inf(1)
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if !q.Start.IsZero() {
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min = numeric.Int64ToFloat64(q.Start.UnixNano())
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}
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if !q.End.IsZero() {
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max = numeric.Int64ToFloat64(q.End.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.IsZero() && q.End.IsZero() {
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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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