mirror of https://github.com/k3s-io/k3s
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
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/*
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Copyright 2014 Google Inc. All rights reserved.
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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 runtime
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import (
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"fmt"
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"reflect"
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)
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// GetItemsPtr returns a pointer to the list object's Items member.
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// If 'list' doesn't have an Items member, it's not really a list type
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// and an error will be returned.
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// This function will either return a pointer to a slice, or an error, but not both.
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func GetItemsPtr(list Object) (interface{}, error) {
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v := reflect.ValueOf(list)
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if !v.IsValid() {
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return nil, fmt.Errorf("nil list object")
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}
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items := v.Elem().FieldByName("Items")
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if !items.IsValid() {
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return nil, fmt.Errorf("no Items field in %#v", list)
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}
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if items.Kind() != reflect.Slice {
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return nil, fmt.Errorf("Items field is not a slice")
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}
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return items.Addr().Interface(), nil
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}
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// ExtractList returns obj's Items element as an array of runtime.Objects.
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// Returns an error if obj is not a List type (does not have an Items member).
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func ExtractList(obj Object) ([]Object, error) {
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itemsPtr, err := GetItemsPtr(obj)
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if err != nil {
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return nil, err
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}
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items := reflect.ValueOf(itemsPtr).Elem()
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list := make([]Object, items.Len())
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for i := range list {
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raw := items.Index(i)
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item, ok := raw.Addr().Interface().(Object)
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if !ok {
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return nil, fmt.Errorf("item in index %v isn't an object: %#v", i, raw.Interface())
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}
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list[i] = item
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}
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return list, nil
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}
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// SetList sets the given list object's Items member have the elements given in
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// objects.
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// Returns an error if list is not a List type (does not have an Items member),
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// or if any of the objects are not of the right type.
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func SetList(list Object, objects []Object) error {
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itemsPtr, err := GetItemsPtr(list)
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if err != nil {
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return err
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}
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items := reflect.ValueOf(itemsPtr).Elem()
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slice := reflect.MakeSlice(items.Type(), len(objects), len(objects))
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for i := range objects {
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dest := slice.Index(i)
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src := reflect.ValueOf(objects[i])
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if !src.IsValid() || src.IsNil() {
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return fmt.Errorf("an object was nil")
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}
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src = src.Elem() // Object is a pointer, but the items in slice are not.
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if src.Type().AssignableTo(dest.Type()) {
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dest.Set(src)
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} else if src.Type().ConvertibleTo(dest.Type()) {
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dest.Set(src.Convert(dest.Type()))
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} else {
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return fmt.Errorf("wrong type: need %v, got %v", dest.Type(), src.Type())
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}
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}
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items.Set(slice)
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return nil
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}
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