136 lines
3.3 KiB
Go
136 lines
3.3 KiB
Go
/*
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Copyright 2017 Heptio Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package collections
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import (
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"strings"
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"github.com/pkg/errors"
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)
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// GetValue returns the object at root[path], where path is a dot separated string.
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func GetValue(root map[string]interface{}, path string) (interface{}, error) {
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if root == nil {
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return "", errors.New("root is nil")
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}
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pathParts := strings.Split(path, ".")
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key := pathParts[0]
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obj, found := root[pathParts[0]]
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if !found {
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return "", errors.Errorf("key %v not found", pathParts[0])
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}
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if len(pathParts) == 1 {
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return obj, nil
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}
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subMap, ok := obj.(map[string]interface{})
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if !ok {
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return "", errors.Errorf("value at key %v is not a map[string]interface{}", key)
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}
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return GetValue(subMap, strings.Join(pathParts[1:], "."))
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}
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// GetString returns the string at root[path], where path is a dot separated string.
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func GetString(root map[string]interface{}, path string) (string, error) {
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obj, err := GetValue(root, path)
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if err != nil {
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return "", err
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}
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str, ok := obj.(string)
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if !ok {
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return "", errors.Errorf("value at path %v is not a string", path)
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}
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return str, nil
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}
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// GetMap returns the map at root[path], where path is a dot separated string.
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func GetMap(root map[string]interface{}, path string) (map[string]interface{}, error) {
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obj, err := GetValue(root, path)
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if err != nil {
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return nil, err
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}
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ret, ok := obj.(map[string]interface{})
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if !ok {
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return nil, errors.Errorf("value at path %v is not a map[string]interface{}", path)
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}
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return ret, nil
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}
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// GetSlice returns the slice at root[path], where path is a dot separated string.
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func GetSlice(root map[string]interface{}, path string) ([]interface{}, error) {
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obj, err := GetValue(root, path)
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if err != nil {
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return nil, err
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}
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ret, ok := obj.([]interface{})
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if !ok {
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return nil, errors.Errorf("value at path %v is not a []interface{}", path)
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}
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return ret, nil
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}
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// ForEach calls fn on each object in the root[path] array, where path is a dot separated string.
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func ForEach(root map[string]interface{}, path string, fn func(obj map[string]interface{}) error) error {
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s, err := GetSlice(root, path)
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if err != nil {
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return err
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}
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for i := range s {
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obj, ok := s[i].(map[string]interface{})
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if !ok {
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return errors.Errorf("unable to convert %s[%d] to an object", path, i)
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}
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if err := fn(obj); err != nil {
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return err
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}
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}
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return nil
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}
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// Exists returns true if root[path] exists, or false otherwise.
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func Exists(root map[string]interface{}, path string) bool {
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if root == nil {
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return false
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}
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_, err := GetValue(root, path)
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return err == nil
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}
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// HasKeyAndVal returns true if root[path] exists and the value
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// contained is equal to val, or false otherwise.
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func HasKeyAndVal(root map[string]interface{}, path string, val interface{}) bool {
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valObj, err := GetValue(root, path)
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if err != nil {
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return false
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}
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return valObj == val
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}
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