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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 index
-
- import (
- "bytes"
- "encoding/json"
- "fmt"
-
- "github.com/blevesearch/bleve/document"
- "github.com/blevesearch/bleve/index/store"
- )
-
- var ErrorUnknownStorageType = fmt.Errorf("unknown storage type")
-
- type Index interface {
- Open() error
- Close() error
-
- Update(doc *document.Document) error
- Delete(id string) error
- Batch(batch *Batch) error
-
- SetInternal(key, val []byte) error
- DeleteInternal(key []byte) error
-
- // Reader returns a low-level accessor on the index data. Close it to
- // release associated resources.
- Reader() (IndexReader, error)
-
- Stats() json.Marshaler
- StatsMap() map[string]interface{}
-
- Analyze(d *document.Document) *AnalysisResult
-
- Advanced() (store.KVStore, error)
- }
-
- type DocumentFieldTermVisitor func(field string, term []byte)
-
- type IndexReader interface {
- TermFieldReader(term []byte, field string, includeFreq, includeNorm, includeTermVectors bool) (TermFieldReader, error)
-
- // DocIDReader returns an iterator over all doc ids
- // The caller must close returned instance to release associated resources.
- DocIDReaderAll() (DocIDReader, error)
-
- DocIDReaderOnly(ids []string) (DocIDReader, error)
-
- FieldDict(field string) (FieldDict, error)
-
- // FieldDictRange is currently defined to include the start and end terms
- FieldDictRange(field string, startTerm []byte, endTerm []byte) (FieldDict, error)
- FieldDictPrefix(field string, termPrefix []byte) (FieldDict, error)
-
- Document(id string) (*document.Document, error)
- DocumentVisitFieldTerms(id IndexInternalID, fields []string, visitor DocumentFieldTermVisitor) error
-
- Fields() ([]string, error)
-
- GetInternal(key []byte) ([]byte, error)
-
- DocCount() (uint64, error)
-
- ExternalID(id IndexInternalID) (string, error)
- InternalID(id string) (IndexInternalID, error)
-
- DumpAll() chan interface{}
- DumpDoc(id string) chan interface{}
- DumpFields() chan interface{}
-
- Close() error
- }
-
- // FieldTerms contains the terms used by a document, keyed by field
- type FieldTerms map[string][]string
-
- // FieldsNotYetCached returns a list of fields not yet cached out of a larger list of fields
- func (f FieldTerms) FieldsNotYetCached(fields []string) []string {
- rv := make([]string, 0, len(fields))
- for _, field := range fields {
- if _, ok := f[field]; !ok {
- rv = append(rv, field)
- }
- }
- return rv
- }
-
- // Merge will combine two FieldTerms
- // it assumes that the terms lists are complete (thus do not need to be merged)
- // field terms from the other list always replace the ones in the receiver
- func (f FieldTerms) Merge(other FieldTerms) {
- for field, terms := range other {
- f[field] = terms
- }
- }
-
- type TermFieldVector struct {
- Field string
- ArrayPositions []uint64
- Pos uint64
- Start uint64
- End uint64
- }
-
- // IndexInternalID is an opaque document identifier interal to the index impl
- type IndexInternalID []byte
-
- func (id IndexInternalID) Equals(other IndexInternalID) bool {
- return id.Compare(other) == 0
- }
-
- func (id IndexInternalID) Compare(other IndexInternalID) int {
- return bytes.Compare(id, other)
- }
-
- type TermFieldDoc struct {
- Term string
- ID IndexInternalID
- Freq uint64
- Norm float64
- Vectors []*TermFieldVector
- }
-
- // Reset allows an already allocated TermFieldDoc to be reused
- func (tfd *TermFieldDoc) Reset() *TermFieldDoc {
- // remember the []byte used for the ID
- id := tfd.ID
- // idiom to copy over from empty TermFieldDoc (0 allocations)
- *tfd = TermFieldDoc{}
- // reuse the []byte already allocated (and reset len to 0)
- tfd.ID = id[:0]
- return tfd
- }
-
- // TermFieldReader is the interface exposing the enumeration of documents
- // containing a given term in a given field. Documents are returned in byte
- // lexicographic order over their identifiers.
- type TermFieldReader interface {
- // Next returns the next document containing the term in this field, or nil
- // when it reaches the end of the enumeration. The preAlloced TermFieldDoc
- // is optional, and when non-nil, will be used instead of allocating memory.
- Next(preAlloced *TermFieldDoc) (*TermFieldDoc, error)
-
- // Advance resets the enumeration at specified document or its immediate
- // follower.
- Advance(ID IndexInternalID, preAlloced *TermFieldDoc) (*TermFieldDoc, error)
-
- // Count returns the number of documents contains the term in this field.
- Count() uint64
- Close() error
- }
-
- type DictEntry struct {
- Term string
- Count uint64
- }
-
- type FieldDict interface {
- Next() (*DictEntry, error)
- Close() error
- }
-
- // DocIDReader is the interface exposing enumeration of documents identifiers.
- // Close the reader to release associated resources.
- type DocIDReader interface {
- // Next returns the next document internal identifier in the natural
- // index order, nil when the end of the sequence is reached.
- Next() (IndexInternalID, error)
-
- // Advance resets the iteration to the first internal identifier greater than
- // or equal to ID. If ID is smaller than the start of the range, the iteration
- // will start there instead. If ID is greater than or equal to the end of
- // the range, Next() call will return io.EOF.
- Advance(ID IndexInternalID) (IndexInternalID, error)
- Close() error
- }
-
- type Batch struct {
- IndexOps map[string]*document.Document
- InternalOps map[string][]byte
- }
-
- func NewBatch() *Batch {
- return &Batch{
- IndexOps: make(map[string]*document.Document),
- InternalOps: make(map[string][]byte),
- }
- }
-
- func (b *Batch) Update(doc *document.Document) {
- b.IndexOps[doc.ID] = doc
- }
-
- func (b *Batch) Delete(id string) {
- b.IndexOps[id] = nil
- }
-
- func (b *Batch) SetInternal(key, val []byte) {
- b.InternalOps[string(key)] = val
- }
-
- func (b *Batch) DeleteInternal(key []byte) {
- b.InternalOps[string(key)] = nil
- }
-
- func (b *Batch) String() string {
- rv := fmt.Sprintf("Batch (%d ops, %d internal ops)\n", len(b.IndexOps), len(b.InternalOps))
- for k, v := range b.IndexOps {
- if v != nil {
- rv += fmt.Sprintf("\tINDEX - '%s'\n", k)
- } else {
- rv += fmt.Sprintf("\tDELETE - '%s'\n", k)
- }
- }
- for k, v := range b.InternalOps {
- if v != nil {
- rv += fmt.Sprintf("\tSET INTERNAL - '%s'\n", k)
- } else {
- rv += fmt.Sprintf("\tDELETE INTERNAL - '%s'\n", k)
- }
- }
- return rv
- }
-
- func (b *Batch) Reset() {
- b.IndexOps = make(map[string]*document.Document)
- b.InternalOps = make(map[string][]byte)
- }
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