forked from blevesearch/bleve
/
mapping_document.go
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/
mapping_document.go
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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 bleve
import (
"encoding/json"
"fmt"
"reflect"
"time"
"github.com/blevesearch/bleve/registry"
)
// A DocumentMapping describes how a type of document
// should be indexed.
// As documents can be hierarchical, named sub-sections
// of documents are mapped using the same structure in
// the Properties field.
// Each value inside a document can be indexed 0 or more
// ways. These index entries are called fields and
// are stored in the Fields field.
// Entire sections of a document can be ignored or
// excluded by setting Enabled to false.
// If not explicitly mapped, default mapping operations
// are used. To disable this automatic handling, set
// Dynamic to false.
type DocumentMapping struct {
Enabled bool `json:"enabled"`
Dynamic bool `json:"dynamic"`
Properties map[string]*DocumentMapping `json:"properties,omitempty"`
Fields []*FieldMapping `json:"fields,omitempty"`
DefaultAnalyzer string `json:"default_analyzer"`
}
func (dm *DocumentMapping) validate(cache *registry.Cache) error {
var err error
if dm.DefaultAnalyzer != "" {
_, err := cache.AnalyzerNamed(dm.DefaultAnalyzer)
if err != nil {
return err
}
}
for _, property := range dm.Properties {
err = property.validate(cache)
if err != nil {
return err
}
}
for _, field := range dm.Fields {
if field.Analyzer != "" {
_, err = cache.AnalyzerNamed(field.Analyzer)
if err != nil {
return err
}
}
if field.DateFormat != "" {
_, err = cache.DateTimeParserNamed(field.DateFormat)
if err != nil {
return err
}
}
switch field.Type {
case "text", "datetime", "number":
default:
return fmt.Errorf("unknown field type: '%s'", field.Type)
}
}
return nil
}
func (dm *DocumentMapping) analyzerNameForPath(path string) string {
pathElements := decodePath(path)
last := false
current := dm
OUTER:
for i, pathElement := range pathElements {
if i == len(pathElements)-1 {
last = true
}
for name, subDocMapping := range current.Properties {
for _, field := range subDocMapping.Fields {
if field.Name == "" && name == pathElement {
if last {
return field.Analyzer
}
current = subDocMapping
continue OUTER
} else if field.Name == pathElement {
if last {
return field.Analyzer
}
current = subDocMapping
continue OUTER
}
}
}
return ""
}
return ""
}
func (dm *DocumentMapping) documentMappingForPath(path string) *DocumentMapping {
pathElements := decodePath(path)
current := dm
OUTER:
for _, pathElement := range pathElements {
for name, subDocMapping := range current.Properties {
for _, field := range subDocMapping.Fields {
if field.Name == "" && name == pathElement {
current = subDocMapping
continue OUTER
} else if field.Name == pathElement {
current = subDocMapping
continue OUTER
}
}
}
return nil
}
return current
}
// NewDocumentMapping returns a new document mapping
// with all the default values.
func NewDocumentMapping() *DocumentMapping {
return &DocumentMapping{
Enabled: true,
Dynamic: true,
}
}
// NewDocumentStaticMapping returns a new document
// mapping that will not automatically index parts
// of a document without an explicit mapping.
func NewDocumentStaticMapping() *DocumentMapping {
return &DocumentMapping{
Enabled: true,
}
}
// NewDocumentDisabledMapping returns a new document
// mapping that will not perform any indexing.
func NewDocumentDisabledMapping() *DocumentMapping {
return &DocumentMapping{}
}
// AddSubDocumentMapping adds the provided DocumentMapping as a sub-mapping
// for the specified named subsection.
func (dm *DocumentMapping) AddSubDocumentMapping(property string, sdm *DocumentMapping) {
if dm.Properties == nil {
dm.Properties = make(map[string]*DocumentMapping)
}
dm.Properties[property] = sdm
}
// AddFieldMappingsAt adds one or more FieldMappings
// at the named sub-document. If the named sub-document
// doesn't yet exist it is created for you.
// This is a convenience function to make most common
// mappings more concise.
// Otherwise, you would:
// subMapping := NewDocumentMapping()
// subMapping.AddFieldMapping(fieldMapping)
// parentMapping.AddSubDocumentMapping(property, subMapping)
func (dm *DocumentMapping) AddFieldMappingsAt(property string, fms ...*FieldMapping) {
if dm.Properties == nil {
dm.Properties = make(map[string]*DocumentMapping)
}
sdm, ok := dm.Properties[property]
if !ok {
sdm = NewDocumentMapping()
}
for _, fm := range fms {
sdm.AddFieldMapping(fm)
}
dm.Properties[property] = sdm
}
// AddFieldMapping adds the provided FieldMapping for this section
// of the document.
func (dm *DocumentMapping) AddFieldMapping(fm *FieldMapping) {
if dm.Fields == nil {
dm.Fields = make([]*FieldMapping, 0)
}
dm.Fields = append(dm.Fields, fm)
}
// UnmarshalJSON deserializes a JSON representation
// of the DocumentMapping.
func (dm *DocumentMapping) UnmarshalJSON(data []byte) error {
var tmp struct {
Enabled *bool `json:"enabled"`
Dynamic *bool `json:"dynamic"`
Properties map[string]*DocumentMapping `json:"properties"`
Fields []*FieldMapping `json:"fields"`
DefaultAnalyzer string `json:"default_analyzer"`
}
err := json.Unmarshal(data, &tmp)
if err != nil {
return err
}
dm.Enabled = true
if tmp.Enabled != nil {
dm.Enabled = *tmp.Enabled
}
dm.Dynamic = true
if tmp.Dynamic != nil {
dm.Dynamic = *tmp.Dynamic
}
dm.DefaultAnalyzer = tmp.DefaultAnalyzer
if tmp.Properties != nil {
dm.Properties = make(map[string]*DocumentMapping, len(tmp.Properties))
}
for propName, propMapping := range tmp.Properties {
dm.Properties[propName] = propMapping
}
if tmp.Fields != nil {
dm.Fields = make([]*FieldMapping, len(tmp.Fields))
}
for i, field := range tmp.Fields {
dm.Fields[i] = field
}
return nil
}
func (dm *DocumentMapping) defaultAnalyzerName(path []string) string {
rv := ""
current := dm
for _, pathElement := range path {
var ok bool
current, ok = current.Properties[pathElement]
if !ok {
break
}
if current.DefaultAnalyzer != "" {
rv = current.DefaultAnalyzer
}
}
return rv
}
func (dm *DocumentMapping) walkDocument(data interface{}, path []string, indexes []uint64, context *walkContext) {
val := reflect.ValueOf(data)
typ := val.Type()
switch typ.Kind() {
case reflect.Map:
// FIXME can add support for other map keys in the future
if typ.Key().Kind() == reflect.String {
for _, key := range val.MapKeys() {
fieldName := key.String()
fieldVal := val.MapIndex(key).Interface()
dm.processProperty(fieldVal, append(path, fieldName), indexes, context)
}
}
case reflect.Struct:
for i := 0; i < val.NumField(); i++ {
field := typ.Field(i)
fieldName := field.Name
// if the field has a JSON name, prefer that
jsonTag := field.Tag.Get("json")
jsonFieldName := parseJSONTagName(jsonTag)
if jsonFieldName == "-" {
continue
}
if jsonFieldName != "" {
fieldName = jsonFieldName
}
if val.Field(i).CanInterface() {
fieldVal := val.Field(i).Interface()
dm.processProperty(fieldVal, append(path, fieldName), indexes, context)
}
}
case reflect.Slice, reflect.Array:
for i := 0; i < val.Len(); i++ {
if val.Index(i).CanInterface() {
fieldVal := val.Index(i).Interface()
dm.processProperty(fieldVal, path, append(indexes, uint64(i)), context)
}
}
case reflect.Ptr:
ptrElem := val.Elem()
if ptrElem.IsValid() && ptrElem.CanInterface() {
dm.processProperty(ptrElem.Interface(), path, indexes, context)
}
}
}
func (dm *DocumentMapping) processProperty(property interface{}, path []string, indexes []uint64, context *walkContext) {
pathString := encodePath(path)
// look to see if there is a mapping for this field
subDocMapping := dm.documentMappingForPath(pathString)
// check to see if we even need to do further processing
if subDocMapping != nil && !subDocMapping.Enabled {
return
}
propertyValue := reflect.ValueOf(property)
if !propertyValue.IsValid() {
// cannot do anything with the zero value
return
}
propertyType := propertyValue.Type()
switch propertyType.Kind() {
case reflect.String:
propertyValueString := propertyValue.String()
if subDocMapping != nil {
// index by explicit mapping
for _, fieldMapping := range subDocMapping.Fields {
fieldMapping.processString(propertyValueString, pathString, path, indexes, context)
}
} else {
// automatic indexing behavior
// first see if it can be parsed by the default date parser
dateTimeParser := context.im.dateTimeParserNamed(context.im.DefaultDateTimeParser)
if dateTimeParser != nil {
parsedDateTime, err := dateTimeParser.ParseDateTime(propertyValueString)
if err != nil {
// index as text
fieldMapping := NewTextFieldMapping()
fieldMapping.processString(propertyValueString, pathString, path, indexes, context)
} else {
// index as datetime
fieldMapping := NewDateTimeFieldMapping()
fieldMapping.processTime(parsedDateTime, pathString, path, indexes, context)
}
}
}
case reflect.Float64:
propertyValFloat := propertyValue.Float()
if subDocMapping != nil {
// index by explicit mapping
for _, fieldMapping := range subDocMapping.Fields {
fieldMapping.processFloat64(propertyValFloat, pathString, path, indexes, context)
}
} else {
// automatic indexing behavior
fieldMapping := NewNumericFieldMapping()
fieldMapping.processFloat64(propertyValFloat, pathString, path, indexes, context)
}
case reflect.Struct:
switch property := property.(type) {
case time.Time:
// don't descend into the time struct
if subDocMapping != nil {
// index by explicit mapping
for _, fieldMapping := range subDocMapping.Fields {
fieldMapping.processTime(property, pathString, path, indexes, context)
}
} else {
fieldMapping := NewDateTimeFieldMapping()
fieldMapping.processTime(property, pathString, path, indexes, context)
}
default:
dm.walkDocument(property, path, indexes, context)
}
default:
dm.walkDocument(property, path, indexes, context)
}
}