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89 lines
2.6 KiB
89 lines
2.6 KiB
// 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/search/highlight"
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)
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func RegisterHighlighter(name string, constructor HighlighterConstructor) {
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_, exists := highlighters[name]
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if exists {
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panic(fmt.Errorf("attempted to register duplicate highlighter named '%s'", name))
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}
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highlighters[name] = constructor
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}
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type HighlighterConstructor func(config map[string]interface{}, cache *Cache) (highlight.Highlighter, error)
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type HighlighterRegistry map[string]HighlighterConstructor
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type HighlighterCache struct {
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*ConcurrentCache
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}
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func NewHighlighterCache() *HighlighterCache {
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return &HighlighterCache{
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NewConcurrentCache(),
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}
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}
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func HighlighterBuild(name string, config map[string]interface{}, cache *Cache) (interface{}, error) {
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cons, registered := highlighters[name]
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if !registered {
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return nil, fmt.Errorf("no highlighter with name or type '%s' registered", name)
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}
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highlighter, err := cons(config, cache)
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if err != nil {
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return nil, fmt.Errorf("error building highlighter: %v", err)
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}
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return highlighter, nil
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}
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func (c *HighlighterCache) HighlighterNamed(name string, cache *Cache) (highlight.Highlighter, error) {
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item, err := c.ItemNamed(name, cache, HighlighterBuild)
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if err != nil {
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return nil, err
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}
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return item.(highlight.Highlighter), nil
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}
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func (c *HighlighterCache) DefineHighlighter(name string, typ string, config map[string]interface{}, cache *Cache) (highlight.Highlighter, error) {
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item, err := c.DefineItem(name, typ, config, cache, HighlighterBuild)
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if err != nil {
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if err == ErrAlreadyDefined {
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return nil, fmt.Errorf("highlighter 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.(highlight.Highlighter), nil
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}
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func HighlighterTypesAndInstances() ([]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 highlighters {
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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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