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gitea/vendor/github.com/blevesearch/bleve_index_api/index.go

212 lines
5.8 KiB

// 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"
"reflect"
)
var reflectStaticSizeTermFieldDoc int
var reflectStaticSizeTermFieldVector int
func init() {
var tfd TermFieldDoc
reflectStaticSizeTermFieldDoc = int(reflect.TypeOf(tfd).Size())
var tfv TermFieldVector
reflectStaticSizeTermFieldVector = int(reflect.TypeOf(tfv).Size())
}
type Index interface {
Open() error
Close() error
Update(doc 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)
StatsMap() map[string]interface{}
}
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, error)
DocValueReader(fields []string) (DocValueReader, error)
Fields() ([]string, error)
GetInternal(key []byte) ([]byte, error)
DocCount() (uint64, error)
ExternalID(id IndexInternalID) (string, error)
InternalID(id string) (IndexInternalID, error)
Close() error
}
type IndexReaderRegexp interface {
FieldDictRegexp(field string, regex string) (FieldDict, error)
}
type IndexReaderFuzzy interface {
FieldDictFuzzy(field string, term string, fuzziness int, prefix string) (FieldDict, error)
}
type IndexReaderContains interface {
FieldDictContains(field string) (FieldDictContains, error)
}
type TermFieldVector struct {
Field string
ArrayPositions []uint64
Pos uint64
Start uint64
End uint64
}
func (tfv *TermFieldVector) Size() int {
return reflectStaticSizeTermFieldVector + sizeOfPtr +
len(tfv.Field) + len(tfv.ArrayPositions)*sizeOfUint64
}
// 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
}
func (tfd *TermFieldDoc) Size() int {
sizeInBytes := reflectStaticSizeTermFieldDoc + sizeOfPtr +
len(tfd.Term) + len(tfd.ID)
for _, entry := range tfd.Vectors {
sizeInBytes += entry.Size()
}
return sizeInBytes
}
// Reset allows an already allocated TermFieldDoc to be reused
func (tfd *TermFieldDoc) Reset() *TermFieldDoc {
// remember the []byte used for the ID
id := tfd.ID
vectors := tfd.Vectors
// 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]
tfd.Vectors = vectors[: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
Size() int
}
type DictEntry struct {
Term string
Count uint64
}
type FieldDict interface {
Next() (*DictEntry, error)
Close() error
}
type FieldDictContains interface {
Contains(key []byte) (bool, 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)
Size() int
Close() error
}
type DocValueVisitor func(field string, term []byte)
type DocValueReader interface {
VisitDocValues(id IndexInternalID, visitor DocValueVisitor) error
}
// IndexBuilder is an interface supported by some index schemes
// to allow direct write-only index building
type IndexBuilder interface {
Index(doc Document) error
Close() error
}