120 lines
3.4 KiB
Go
120 lines
3.4 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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"github.com/blevesearch/bleve/analysis"
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)
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const DefaultTextIndexingOptions = IndexField | DocValues
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type TextField struct {
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name string
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arrayPositions []uint64
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options IndexingOptions
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analyzer *analysis.Analyzer
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value []byte
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numPlainTextBytes uint64
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}
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func (t *TextField) Name() string {
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return t.name
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}
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func (t *TextField) ArrayPositions() []uint64 {
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return t.arrayPositions
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}
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func (t *TextField) Options() IndexingOptions {
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return t.options
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}
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func (t *TextField) Analyze() (int, analysis.TokenFrequencies) {
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var tokens analysis.TokenStream
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if t.analyzer != nil {
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bytesToAnalyze := t.Value()
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if t.options.IsStored() {
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// need to copy
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bytesCopied := make([]byte, len(bytesToAnalyze))
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copy(bytesCopied, bytesToAnalyze)
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bytesToAnalyze = bytesCopied
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}
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tokens = t.analyzer.Analyze(bytesToAnalyze)
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} else {
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tokens = analysis.TokenStream{
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&analysis.Token{
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Start: 0,
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End: len(t.value),
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Term: t.value,
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Position: 1,
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Type: analysis.AlphaNumeric,
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},
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}
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}
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fieldLength := len(tokens) // number of tokens in this doc field
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tokenFreqs := analysis.TokenFrequency(tokens, t.arrayPositions, t.options.IncludeTermVectors())
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return fieldLength, tokenFreqs
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}
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func (t *TextField) Value() []byte {
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return t.value
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}
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func (t *TextField) GoString() string {
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return fmt.Sprintf("&document.TextField{Name:%s, Options: %s, Analyzer: %v, Value: %s, ArrayPositions: %v}", t.name, t.options, t.analyzer, t.value, t.arrayPositions)
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}
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func (t *TextField) NumPlainTextBytes() uint64 {
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return t.numPlainTextBytes
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}
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func NewTextField(name string, arrayPositions []uint64, value []byte) *TextField {
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return NewTextFieldWithIndexingOptions(name, arrayPositions, value, DefaultTextIndexingOptions)
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}
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func NewTextFieldWithIndexingOptions(name string, arrayPositions []uint64, value []byte, options IndexingOptions) *TextField {
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return &TextField{
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name: name,
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arrayPositions: arrayPositions,
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options: options,
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value: value,
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numPlainTextBytes: uint64(len(value)),
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}
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}
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func NewTextFieldWithAnalyzer(name string, arrayPositions []uint64, value []byte, analyzer *analysis.Analyzer) *TextField {
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return &TextField{
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name: name,
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arrayPositions: arrayPositions,
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options: DefaultTextIndexingOptions,
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analyzer: analyzer,
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value: value,
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numPlainTextBytes: uint64(len(value)),
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}
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}
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func NewTextFieldCustom(name string, arrayPositions []uint64, value []byte, options IndexingOptions, analyzer *analysis.Analyzer) *TextField {
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return &TextField{
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name: name,
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arrayPositions: arrayPositions,
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options: options,
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analyzer: analyzer,
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value: value,
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numPlainTextBytes: uint64(len(value)),
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}
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}
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