// 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 RegisterTokenFilter(name string, constructor TokenFilterConstructor) { _, exists := tokenFilters[name] if exists { panic(fmt.Errorf("attempted to register duplicate token filter named '%s'", name)) } tokenFilters[name] = constructor } type TokenFilterConstructor func(config map[string]interface{}, cache *Cache) (analysis.TokenFilter, error) type TokenFilterRegistry map[string]TokenFilterConstructor type TokenFilterCache struct { *ConcurrentCache } func NewTokenFilterCache() *TokenFilterCache { return &TokenFilterCache{ NewConcurrentCache(), } } func TokenFilterBuild(name string, config map[string]interface{}, cache *Cache) (interface{}, error) { cons, registered := tokenFilters[name] if !registered { return nil, fmt.Errorf("no token filter with name or type '%s' registered", name) } tokenFilter, err := cons(config, cache) if err != nil { return nil, fmt.Errorf("error building token filter: %v", err) } return tokenFilter, nil } func (c *TokenFilterCache) TokenFilterNamed(name string, cache *Cache) (analysis.TokenFilter, error) { item, err := c.ItemNamed(name, cache, TokenFilterBuild) if err != nil { return nil, err } return item.(analysis.TokenFilter), nil } func (c *TokenFilterCache) DefineTokenFilter(name string, typ string, config map[string]interface{}, cache *Cache) (analysis.TokenFilter, error) { item, err := c.DefineItem(name, typ, config, cache, TokenFilterBuild) if err != nil { if err == ErrAlreadyDefined { return nil, fmt.Errorf("token filter named '%s' already defined", name) } return nil, err } return item.(analysis.TokenFilter), nil } func TokenFilterTypesAndInstances() ([]string, []string) { emptyConfig := map[string]interface{}{} emptyCache := NewCache() var types []string var instances []string for name, cons := range tokenFilters { _, err := cons(emptyConfig, emptyCache) if err == nil { instances = append(instances, name) } else { types = append(types, name) } } return types, instances }