145 lines
3.9 KiB
Go
145 lines
3.9 KiB
Go
// 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 document
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import (
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"fmt"
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"math"
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"time"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/numeric"
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)
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const DefaultDateTimeIndexingOptions = StoreField | IndexField
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const DefaultDateTimePrecisionStep uint = 4
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var MinTimeRepresentable = time.Unix(0, math.MinInt64)
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var MaxTimeRepresentable = time.Unix(0, math.MaxInt64)
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type DateTimeField struct {
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name string
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arrayPositions []uint64
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options IndexingOptions
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value numeric.PrefixCoded
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numPlainTextBytes uint64
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}
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func (n *DateTimeField) Name() string {
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return n.name
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}
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func (n *DateTimeField) ArrayPositions() []uint64 {
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return n.arrayPositions
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}
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func (n *DateTimeField) Options() IndexingOptions {
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return n.options
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}
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func (n *DateTimeField) Analyze() (int, analysis.TokenFrequencies) {
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tokens := make(analysis.TokenStream, 0)
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tokens = append(tokens, &analysis.Token{
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Start: 0,
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End: len(n.value),
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Term: n.value,
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Position: 1,
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Type: analysis.DateTime,
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})
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original, err := n.value.Int64()
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if err == nil {
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shift := DefaultDateTimePrecisionStep
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for shift < 64 {
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shiftEncoded, err := numeric.NewPrefixCodedInt64(original, shift)
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if err != nil {
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break
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}
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token := analysis.Token{
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Start: 0,
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End: len(shiftEncoded),
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Term: shiftEncoded,
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Position: 1,
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Type: analysis.DateTime,
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}
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tokens = append(tokens, &token)
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shift += DefaultDateTimePrecisionStep
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}
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}
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fieldLength := len(tokens)
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tokenFreqs := analysis.TokenFrequency(tokens, n.arrayPositions, n.options.IncludeTermVectors())
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return fieldLength, tokenFreqs
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}
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func (n *DateTimeField) Value() []byte {
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return n.value
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}
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func (n *DateTimeField) DateTime() (time.Time, error) {
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i64, err := n.value.Int64()
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if err != nil {
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return time.Time{}, err
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}
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return time.Unix(0, i64).UTC(), nil
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}
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func (n *DateTimeField) GoString() string {
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return fmt.Sprintf("&document.DateField{Name:%s, Options: %s, Value: %s}", n.name, n.options, n.value)
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}
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func (n *DateTimeField) NumPlainTextBytes() uint64 {
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return n.numPlainTextBytes
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}
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func NewDateTimeFieldFromBytes(name string, arrayPositions []uint64, value []byte) *DateTimeField {
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return &DateTimeField{
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name: name,
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arrayPositions: arrayPositions,
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value: value,
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options: DefaultDateTimeIndexingOptions,
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numPlainTextBytes: uint64(len(value)),
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}
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}
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func NewDateTimeField(name string, arrayPositions []uint64, dt time.Time) (*DateTimeField, error) {
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return NewDateTimeFieldWithIndexingOptions(name, arrayPositions, dt, DefaultDateTimeIndexingOptions)
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}
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func NewDateTimeFieldWithIndexingOptions(name string, arrayPositions []uint64, dt time.Time, options IndexingOptions) (*DateTimeField, error) {
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if canRepresent(dt) {
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dtInt64 := dt.UnixNano()
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prefixCoded := numeric.MustNewPrefixCodedInt64(dtInt64, 0)
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return &DateTimeField{
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name: name,
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arrayPositions: arrayPositions,
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value: prefixCoded,
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options: options,
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// not correct, just a place holder until we revisit how fields are
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// represented and can fix this better
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numPlainTextBytes: uint64(8),
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}, nil
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}
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return nil, fmt.Errorf("cannot represent %s in this type", dt)
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}
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func canRepresent(dt time.Time) bool {
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if dt.Before(MinTimeRepresentable) || dt.After(MaxTimeRepresentable) {
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return false
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}
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return true
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}
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