79cc39a67e
the index mapping contains some relatively messy logic and the top-level bleve package only cares about a relatively small portion of this the motivation for this change is to codify the part that the top-level bleve package cares about into an interface then move all the details into its own package NOTE: the top-level bleve package still has hard dependency on the actual implementation (for now) because it must deserialize mappings from JSON and simply assumes it is this one instance. this is seen as OK for now, and this issue could be revisited in a future change. moving the logic into a separate package is seen as a simplification of top-level bleve, even though we still depend on the one particular implementation.
80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package mapping
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import (
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"reflect"
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"strings"
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)
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func lookupPropertyPath(data interface{}, path string) interface{} {
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pathParts := decodePath(path)
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current := data
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for _, part := range pathParts {
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current = lookupPropertyPathPart(current, part)
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if current == nil {
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break
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}
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}
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return current
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}
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func lookupPropertyPathPart(data interface{}, part string) interface{} {
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val := reflect.ValueOf(data)
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typ := val.Type()
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switch typ.Kind() {
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case reflect.Map:
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// FIXME can add support for other map keys in the future
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if typ.Key().Kind() == reflect.String {
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key := reflect.ValueOf(part)
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entry := val.MapIndex(key)
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if entry.IsValid() {
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return entry.Interface()
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}
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}
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case reflect.Struct:
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field := val.FieldByName(part)
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if field.IsValid() && field.CanInterface() {
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return field.Interface()
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}
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}
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return nil
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}
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const pathSeparator = "."
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func decodePath(path string) []string {
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return strings.Split(path, pathSeparator)
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}
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func encodePath(pathElements []string) string {
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return strings.Join(pathElements, pathSeparator)
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}
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func mustString(data interface{}) (string, bool) {
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if data != nil {
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str, ok := data.(string)
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if ok {
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return str, true
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}
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}
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return "", false
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}
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// parseJSONTagName extracts the JSON field name from a struct tag
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func parseJSONTagName(tag string) string {
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if idx := strings.Index(tag, ","); idx != -1 {
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return tag[:idx]
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}
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return tag
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}
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