github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/runtime/helper.go (about) 1 /* 2 Copyright 2014 The Kubernetes Authors All rights reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package runtime 18 19 import ( 20 "fmt" 21 "reflect" 22 23 "k8s.io/kubernetes/pkg/conversion" 24 ) 25 26 // fieldPtr puts the address of fieldName, which must be a member of v, 27 // into dest, which must be an address of a variable to which this field's 28 // address can be assigned. 29 func FieldPtr(v reflect.Value, fieldName string, dest interface{}) error { 30 field := v.FieldByName(fieldName) 31 if !field.IsValid() { 32 return fmt.Errorf("couldn't find %v field in %#v", fieldName, v.Interface()) 33 } 34 v, err := conversion.EnforcePtr(dest) 35 if err != nil { 36 return err 37 } 38 field = field.Addr() 39 if field.Type().AssignableTo(v.Type()) { 40 v.Set(field) 41 return nil 42 } 43 if field.Type().ConvertibleTo(v.Type()) { 44 v.Set(field.Convert(v.Type())) 45 return nil 46 } 47 return fmt.Errorf("couldn't assign/convert %v to %v", field.Type(), v.Type()) 48 } 49 50 // DecodeList alters the list in place, attempting to decode any objects found in 51 // the list that have the runtime.Unknown type. Any errors that occur are returned 52 // after the entire list is processed. Decoders are tried in order. 53 func DecodeList(objects []Object, decoders ...ObjectDecoder) []error { 54 errs := []error(nil) 55 for i, obj := range objects { 56 switch t := obj.(type) { 57 case *Unknown: 58 for _, decoder := range decoders { 59 if !decoder.Recognizes(t.APIVersion, t.Kind) { 60 continue 61 } 62 obj, err := decoder.Decode(t.RawJSON) 63 if err != nil { 64 errs = append(errs, err) 65 break 66 } 67 objects[i] = obj 68 break 69 } 70 } 71 } 72 return errs 73 } 74 75 // MultiObjectTyper returns the types of objects across multiple schemes in order. 76 type MultiObjectTyper []ObjectTyper 77 78 var _ ObjectTyper = MultiObjectTyper{} 79 80 func (m MultiObjectTyper) DataVersionAndKind(data []byte) (version, kind string, err error) { 81 for _, t := range m { 82 version, kind, err = t.DataVersionAndKind(data) 83 if err == nil { 84 return 85 } 86 } 87 return 88 } 89 90 func (m MultiObjectTyper) ObjectVersionAndKind(obj Object) (version, kind string, err error) { 91 for _, t := range m { 92 version, kind, err = t.ObjectVersionAndKind(obj) 93 if err == nil { 94 return 95 } 96 } 97 return 98 } 99 100 func (m MultiObjectTyper) Recognizes(version, kind string) bool { 101 for _, t := range m { 102 if t.Recognizes(version, kind) { 103 return true 104 } 105 } 106 return false 107 }