0cbe211120
Many existing structs already have a Type field or method which conflicts with the bleve Classifier interface. To address this without breaking existing applications, we introduce an alternate BleveType() method which will be checked first. The interface describing this method is private, as it should never need to be referenced outside this package. fixes #283
436 lines
13 KiB
Go
436 lines
13 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 mapping
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import (
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"encoding/json"
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"fmt"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/analysis/analyzer/standard"
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"github.com/blevesearch/bleve/analysis/datetime/optional"
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/registry"
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)
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var MappingJSONStrict = false
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const defaultTypeField = "_type"
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const defaultType = "_default"
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const defaultField = "_all"
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const defaultAnalyzer = standard.Name
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const defaultDateTimeParser = optional.Name
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// An IndexMappingImpl controls how objects are placed
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// into an index.
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// First the type of the object is determined.
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// Once the type is know, the appropriate
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// DocumentMapping is selected by the type.
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// If no mapping was determined for that type,
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// a DefaultMapping will be used.
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type IndexMappingImpl struct {
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TypeMapping map[string]*DocumentMapping `json:"types,omitempty"`
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DefaultMapping *DocumentMapping `json:"default_mapping"`
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TypeField string `json:"type_field"`
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DefaultType string `json:"default_type"`
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DefaultAnalyzer string `json:"default_analyzer"`
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DefaultDateTimeParser string `json:"default_datetime_parser"`
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DefaultField string `json:"default_field"`
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StoreDynamic bool `json:"store_dynamic"`
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IndexDynamic bool `json:"index_dynamic"`
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CustomAnalysis *customAnalysis `json:"analysis,omitempty"`
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cache *registry.Cache
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}
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// AddCustomCharFilter defines a custom char filter for use in this mapping
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func (im *IndexMappingImpl) AddCustomCharFilter(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineCharFilter(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.CharFilters[name] = config
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return nil
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}
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// AddCustomTokenizer defines a custom tokenizer for use in this mapping
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func (im *IndexMappingImpl) AddCustomTokenizer(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineTokenizer(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.Tokenizers[name] = config
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return nil
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}
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// AddCustomTokenMap defines a custom token map for use in this mapping
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func (im *IndexMappingImpl) AddCustomTokenMap(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineTokenMap(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.TokenMaps[name] = config
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return nil
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}
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// AddCustomTokenFilter defines a custom token filter for use in this mapping
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func (im *IndexMappingImpl) AddCustomTokenFilter(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineTokenFilter(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.TokenFilters[name] = config
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return nil
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}
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// AddCustomAnalyzer defines a custom analyzer for use in this mapping. The
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// config map must have a "type" string entry to resolve the analyzer
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// constructor. The constructor is invoked with the remaining entries and
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// returned analyzer is registered in the IndexMapping.
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//
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// bleve comes with predefined analyzers, like
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// github.com/blevesearch/bleve/analysis/analyzers/custom_analyzer. They are
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// available only if their package is imported by client code. To achieve this,
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// use their metadata to fill configuration entries:
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//
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// import (
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// "github.com/blevesearch/bleve/analysis/analyzers/custom_analyzer"
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// "github.com/blevesearch/bleve/analysis/char_filters/html_char_filter"
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// "github.com/blevesearch/bleve/analysis/token_filters/lower_case_filter"
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// "github.com/blevesearch/bleve/analysis/tokenizers/unicode"
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// )
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//
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// m := bleve.NewIndexMapping()
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// err := m.AddCustomAnalyzer("html", map[string]interface{}{
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// "type": custom_analyzer.Name,
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// "char_filters": []string{
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// html_char_filter.Name,
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// },
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// "tokenizer": unicode.Name,
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// "token_filters": []string{
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// lower_case_filter.Name,
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// ...
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// },
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// })
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func (im *IndexMappingImpl) AddCustomAnalyzer(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineAnalyzer(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.Analyzers[name] = config
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return nil
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}
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// AddCustomDateTimeParser defines a custom date time parser for use in this mapping
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func (im *IndexMappingImpl) AddCustomDateTimeParser(name string, config map[string]interface{}) error {
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_, err := im.cache.DefineDateTimeParser(name, config)
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if err != nil {
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return err
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}
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im.CustomAnalysis.DateTimeParsers[name] = config
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return nil
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}
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// NewIndexMapping creates a new IndexMapping that will use all the default indexing rules
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func NewIndexMapping() *IndexMappingImpl {
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return &IndexMappingImpl{
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TypeMapping: make(map[string]*DocumentMapping),
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DefaultMapping: NewDocumentMapping(),
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TypeField: defaultTypeField,
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DefaultType: defaultType,
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DefaultAnalyzer: defaultAnalyzer,
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DefaultDateTimeParser: defaultDateTimeParser,
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DefaultField: defaultField,
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IndexDynamic: IndexDynamic,
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StoreDynamic: StoreDynamic,
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CustomAnalysis: newCustomAnalysis(),
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cache: registry.NewCache(),
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}
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}
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// Validate will walk the entire structure ensuring the following
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// explicitly named and default analyzers can be built
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func (im *IndexMappingImpl) Validate() error {
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_, err := im.cache.AnalyzerNamed(im.DefaultAnalyzer)
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if err != nil {
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return err
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}
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_, err = im.cache.DateTimeParserNamed(im.DefaultDateTimeParser)
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if err != nil {
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return err
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}
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err = im.DefaultMapping.Validate(im.cache)
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if err != nil {
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return err
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}
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for _, docMapping := range im.TypeMapping {
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err = docMapping.Validate(im.cache)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// AddDocumentMapping sets a custom document mapping for the specified type
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func (im *IndexMappingImpl) AddDocumentMapping(doctype string, dm *DocumentMapping) {
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im.TypeMapping[doctype] = dm
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}
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func (im *IndexMappingImpl) mappingForType(docType string) *DocumentMapping {
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docMapping := im.TypeMapping[docType]
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if docMapping == nil {
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docMapping = im.DefaultMapping
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}
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return docMapping
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}
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// UnmarshalJSON offers custom unmarshaling with optional strict validation
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func (im *IndexMappingImpl) UnmarshalJSON(data []byte) error {
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var tmp map[string]json.RawMessage
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err := json.Unmarshal(data, &tmp)
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if err != nil {
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return err
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}
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// set defaults for fields which might have been omitted
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im.cache = registry.NewCache()
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im.CustomAnalysis = newCustomAnalysis()
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im.TypeField = defaultTypeField
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im.DefaultType = defaultType
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im.DefaultAnalyzer = defaultAnalyzer
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im.DefaultDateTimeParser = defaultDateTimeParser
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im.DefaultField = defaultField
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im.DefaultMapping = NewDocumentMapping()
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im.TypeMapping = make(map[string]*DocumentMapping)
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im.StoreDynamic = StoreDynamic
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im.IndexDynamic = IndexDynamic
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var invalidKeys []string
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for k, v := range tmp {
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switch k {
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case "analysis":
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err := json.Unmarshal(v, &im.CustomAnalysis)
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if err != nil {
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return err
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}
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case "type_field":
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err := json.Unmarshal(v, &im.TypeField)
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if err != nil {
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return err
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}
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case "default_type":
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err := json.Unmarshal(v, &im.DefaultType)
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if err != nil {
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return err
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}
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case "default_analyzer":
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err := json.Unmarshal(v, &im.DefaultAnalyzer)
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if err != nil {
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return err
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}
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case "default_datetime_parser":
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err := json.Unmarshal(v, &im.DefaultDateTimeParser)
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if err != nil {
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return err
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}
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case "default_field":
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err := json.Unmarshal(v, &im.DefaultField)
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if err != nil {
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return err
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}
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case "default_mapping":
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err := json.Unmarshal(v, &im.DefaultMapping)
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if err != nil {
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return err
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}
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case "types":
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err := json.Unmarshal(v, &im.TypeMapping)
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if err != nil {
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return err
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}
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case "store_dynamic":
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err := json.Unmarshal(v, &im.StoreDynamic)
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if err != nil {
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return err
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}
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case "index_dynamic":
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err := json.Unmarshal(v, &im.IndexDynamic)
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if err != nil {
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return err
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}
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default:
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invalidKeys = append(invalidKeys, k)
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}
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}
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if MappingJSONStrict && len(invalidKeys) > 0 {
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return fmt.Errorf("index mapping contains invalid keys: %v", invalidKeys)
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}
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err = im.CustomAnalysis.registerAll(im)
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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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func (im *IndexMappingImpl) determineType(data interface{}) string {
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// first see if the object implements bleveClassifier
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bleveClassifier, ok := data.(bleveClassifier)
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if ok {
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return bleveClassifier.BleveType()
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}
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// next see if the object implements Classifier
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classifier, ok := data.(Classifier)
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if ok {
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return classifier.Type()
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}
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// now see if we can find a type using the mapping
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typ, ok := mustString(lookupPropertyPath(data, im.TypeField))
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if ok {
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return typ
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}
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return im.DefaultType
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}
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func (im *IndexMappingImpl) MapDocument(doc *document.Document, data interface{}) error {
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docType := im.determineType(data)
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docMapping := im.mappingForType(docType)
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walkContext := im.newWalkContext(doc, docMapping)
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if docMapping.Enabled {
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docMapping.walkDocument(data, []string{}, []uint64{}, walkContext)
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// see if the _all field was disabled
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allMapping := docMapping.documentMappingForPath("_all")
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if allMapping == nil || (allMapping.Enabled != false) {
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field := document.NewCompositeFieldWithIndexingOptions("_all", true, []string{}, walkContext.excludedFromAll, document.IndexField|document.IncludeTermVectors)
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doc.AddField(field)
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}
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}
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return nil
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}
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type walkContext struct {
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doc *document.Document
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im *IndexMappingImpl
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dm *DocumentMapping
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excludedFromAll []string
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}
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func (im *IndexMappingImpl) newWalkContext(doc *document.Document, dm *DocumentMapping) *walkContext {
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return &walkContext{
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doc: doc,
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im: im,
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dm: dm,
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excludedFromAll: []string{},
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}
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}
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// AnalyzerNameForPath attempts to find the best analyzer to use with only a
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// field name will walk all the document types, look for field mappings at the
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// provided path, if one exists and it has an explicit analyzer that is
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// returned.
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func (im *IndexMappingImpl) AnalyzerNameForPath(path string) string {
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// first we look for explicit mapping on the field
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for _, docMapping := range im.TypeMapping {
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analyzerName := docMapping.analyzerNameForPath(path)
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if analyzerName != "" {
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return analyzerName
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}
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}
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// now try the default mapping
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pathMapping := im.DefaultMapping.documentMappingForPath(path)
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if pathMapping != nil {
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if len(pathMapping.Fields) > 0 {
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if pathMapping.Fields[0].Analyzer != "" {
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return pathMapping.Fields[0].Analyzer
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}
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}
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}
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// next we will try default analyzers for the path
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pathDecoded := decodePath(path)
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for _, docMapping := range im.TypeMapping {
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rv := docMapping.defaultAnalyzerName(pathDecoded)
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if rv != "" {
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return rv
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}
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}
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return im.DefaultAnalyzer
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}
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func (im *IndexMappingImpl) AnalyzerNamed(name string) *analysis.Analyzer {
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analyzer, err := im.cache.AnalyzerNamed(name)
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if err != nil {
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logger.Printf("error using analyzer named: %s", name)
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return nil
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}
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return analyzer
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}
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func (im *IndexMappingImpl) DateTimeParserNamed(name string) analysis.DateTimeParser {
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if name == "" {
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name = im.DefaultDateTimeParser
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}
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dateTimeParser, err := im.cache.DateTimeParserNamed(name)
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if err != nil {
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logger.Printf("error using datetime parser named: %s", name)
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return nil
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}
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return dateTimeParser
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}
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func (im *IndexMappingImpl) datetimeParserNameForPath(path string) string {
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// first we look for explicit mapping on the field
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for _, docMapping := range im.TypeMapping {
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pathMapping := docMapping.documentMappingForPath(path)
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if pathMapping != nil {
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if len(pathMapping.Fields) > 0 {
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if pathMapping.Fields[0].Analyzer != "" {
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return pathMapping.Fields[0].Analyzer
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}
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}
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}
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}
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return im.DefaultDateTimeParser
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}
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func (im *IndexMappingImpl) AnalyzeText(analyzerName string, text []byte) (analysis.TokenStream, error) {
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analyzer, err := im.cache.AnalyzerNamed(analyzerName)
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if err != nil {
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return nil, err
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}
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return analyzer.Analyze(text), nil
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}
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// FieldAnalyzer returns the name of the analyzer used on a field.
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func (im *IndexMappingImpl) FieldAnalyzer(field string) string {
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return im.AnalyzerNameForPath(field)
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}
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// wrapper to satisfy new interface
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func (im *IndexMappingImpl) DefaultSearchField() string {
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return im.DefaultField
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}
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