bleve搜索引擎源码分析之索引——mapping和lucene一样，也有_all

例子：

package main

import (
    "fmt"
    "github.com/blevesearch/bleve"
)

func main() {
    // open a new index
    mapping := bleve.NewIndexMapping()
    index, err := bleve.New("example.bleve", mapping)
    if err != nil {
        fmt.Println(err)
        return
    }

    data := struct {
        Name string
        Des  string
    }{
        Name: "hello world this is bone",
        Des:  "this is a good time",
    }

    // index some data
    index.Index("id", data)

    // search for some text
    query := bleve.NewMatchQuery("this is bone")
    search := bleve.NewSearchRequest(query)
    searchResults, err := index.Search(search)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(searchResults)
}

mapping这里：

// NewIndexMapping creates a new IndexMapping that will use all the default indexing rules
func NewIndexMapping() *mapping.IndexMappingImpl {
    return mapping.NewIndexMapping()
}

难道是使用和lucene一样的？？？

// NewIndexMapping creates a new IndexMapping that will use all the default indexing rules
func NewIndexMapping() *IndexMappingImpl {
    return &IndexMappingImpl{
        TypeMapping:           make(map[string]*DocumentMapping),
        DefaultMapping:        NewDocumentMapping(),
        TypeField:             defaultTypeField,
        DefaultType:           defaultType,
        DefaultAnalyzer:       defaultAnalyzer,
        DefaultDateTimeParser: defaultDateTimeParser,
        DefaultField:          defaultField,
        IndexDynamic:          IndexDynamic,
        StoreDynamic:          StoreDynamic,
        CustomAnalysis:        newCustomAnalysis(),
        cache:                 registry.NewCache(),
    }
}

New就是设置索引目录和mapping。

// New index at the specified path, must not exist.
// The provided mapping will be used for all
// Index/Search operations.
func New(path string, mapping mapping.IndexMapping) (Index, error) {
    return newIndexUsing(path, mapping, Config.DefaultIndexType, Config.DefaultKVStore, nil)
}

index文档实现:

// Index adds the specified index operation to the
// batch.  NOTE: the bleve Index is not updated
// until the batch is executed.
func (b *Batch) Index(id string, data interface{}) error {
    if id == "" {
        return ErrorEmptyID
    }
    doc := document.NewDocument(id)
    err := b.index.Mapping().MapDocument(doc, data)
    if err != nil {
        return err
    }
    b.internal.Update(doc)
    return nil
}

其中，NewDocument实现：

type Document struct {
    ID              string  `json:"id"`
    Fields          []Field `json:"fields"`
    CompositeFields []*CompositeField
    Number          uint64 `json:"-"`
}

func NewDocument(id string) *Document {
    return &Document{
        ID:              id,
        Fields:          make([]Field, ),
        CompositeFields: make([]*CompositeField, ),
    }
}

MappingDocument实现：

func (im *IndexMappingImpl) MapDocument(doc *document.Document, data interface{}) error {
    docType := im.determineType(data)
    docMapping := im.mappingForType(docType)
    walkContext := im.newWalkContext(doc, docMapping)
    if docMapping.Enabled {
        docMapping.walkDocument(data, []string{}, []uint64{}, walkContext)

        // see if the _all field was disabled
        allMapping := docMapping.documentMappingForPath("_all")
        if allMapping == nil || (allMapping.Enabled != false) {
            field := document.NewCompositeFieldWithIndexingOptions("_all", true, []string{}, walkContext.excludedFromAll, document.IndexField|document.IncludeTermVectors)
            doc.AddField(field)
        }
    }

    return nil
}

我晕，看来bleve真的是和lucene设计一样！也有_all属性。

难道后面倒排列表也会使用skip list？？？