89 lines
2.6 KiB
Go
89 lines
2.6 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 registry
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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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func RegisterTokenizer(name string, constructor TokenizerConstructor) {
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_, exists := tokenizers[name]
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if exists {
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panic(fmt.Errorf("attempted to register duplicate tokenizer named '%s'", name))
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}
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tokenizers[name] = constructor
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}
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type TokenizerConstructor func(config map[string]interface{}, cache *Cache) (analysis.Tokenizer, error)
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type TokenizerRegistry map[string]TokenizerConstructor
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type TokenizerCache struct {
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*ConcurrentCache
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}
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func NewTokenizerCache() *TokenizerCache {
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return &TokenizerCache{
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NewConcurrentCache(),
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}
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}
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func TokenizerBuild(name string, config map[string]interface{}, cache *Cache) (interface{}, error) {
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cons, registered := tokenizers[name]
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if !registered {
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return nil, fmt.Errorf("no tokenizer with name or type '%s' registered", name)
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}
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tokenizer, err := cons(config, cache)
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if err != nil {
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return nil, fmt.Errorf("error building tokenizer: %v", err)
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}
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return tokenizer, nil
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}
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func (c *TokenizerCache) TokenizerNamed(name string, cache *Cache) (analysis.Tokenizer, error) {
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item, err := c.ItemNamed(name, cache, TokenizerBuild)
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if err != nil {
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return nil, err
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}
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return item.(analysis.Tokenizer), nil
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}
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func (c *TokenizerCache) DefineTokenizer(name string, typ string, config map[string]interface{}, cache *Cache) (analysis.Tokenizer, error) {
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item, err := c.DefineItem(name, typ, config, cache, TokenizerBuild)
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if err != nil {
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if err == ErrAlreadyDefined {
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return nil, fmt.Errorf("tokenizer named '%s' already defined", name)
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}
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return nil, err
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}
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return item.(analysis.Tokenizer), nil
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}
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func TokenizerTypesAndInstances() ([]string, []string) {
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emptyConfig := map[string]interface{}{}
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emptyCache := NewCache()
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var types []string
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var instances []string
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for name, cons := range tokenizers {
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_, err := cons(emptyConfig, emptyCache)
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if err == nil {
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instances = append(instances, name)
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} else {
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types = append(types, name)
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}
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}
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return types, instances
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}
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