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