diff options
Diffstat (limited to 'src/kube2msb/vendor/k8s.io/kubernetes/pkg/api/meta/help.go')
-rw-r--r-- | src/kube2msb/vendor/k8s.io/kubernetes/pkg/api/meta/help.go | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/kube2msb/vendor/k8s.io/kubernetes/pkg/api/meta/help.go b/src/kube2msb/vendor/k8s.io/kubernetes/pkg/api/meta/help.go new file mode 100644 index 0000000..0d733a5 --- /dev/null +++ b/src/kube2msb/vendor/k8s.io/kubernetes/pkg/api/meta/help.go @@ -0,0 +1,134 @@ +/* +Copyright 2015 The Kubernetes Authors. + +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 meta + +import ( + "fmt" + "reflect" + + "k8s.io/kubernetes/pkg/conversion" + "k8s.io/kubernetes/pkg/runtime" +) + +// IsListType returns true if the provided Object has a slice called Items +func IsListType(obj runtime.Object) bool { + _, err := GetItemsPtr(obj) + return err == nil +} + +// GetItemsPtr returns a pointer to the list object's Items member. +// If 'list' doesn't have an Items member, it's not really a list type +// and an error will be returned. +// This function will either return a pointer to a slice, or an error, but not both. +func GetItemsPtr(list runtime.Object) (interface{}, error) { + v, err := conversion.EnforcePtr(list) + if err != nil { + return nil, err + } + items := v.FieldByName("Items") + if !items.IsValid() { + return nil, fmt.Errorf("no Items field in %#v", list) + } + switch items.Kind() { + case reflect.Interface, reflect.Ptr: + target := reflect.TypeOf(items.Interface()).Elem() + if target.Kind() != reflect.Slice { + return nil, fmt.Errorf("items: Expected slice, got %s", target.Kind()) + } + return items.Interface(), nil + case reflect.Slice: + return items.Addr().Interface(), nil + default: + return nil, fmt.Errorf("items: Expected slice, got %s", items.Kind()) + } +} + +// ExtractList returns obj's Items element as an array of runtime.Objects. +// Returns an error if obj is not a List type (does not have an Items member). +func ExtractList(obj runtime.Object) ([]runtime.Object, error) { + itemsPtr, err := GetItemsPtr(obj) + if err != nil { + return nil, err + } + items, err := conversion.EnforcePtr(itemsPtr) + if err != nil { + return nil, err + } + list := make([]runtime.Object, items.Len()) + for i := range list { + raw := items.Index(i) + switch item := raw.Interface().(type) { + case runtime.RawExtension: + switch { + case item.Object != nil: + list[i] = item.Object + case item.Raw != nil: + // TODO: Set ContentEncoding and ContentType correctly. + list[i] = &runtime.Unknown{Raw: item.Raw} + default: + list[i] = nil + } + case runtime.Object: + list[i] = item + default: + var found bool + if list[i], found = raw.Addr().Interface().(runtime.Object); !found { + return nil, fmt.Errorf("%v: item[%v]: Expected object, got %#v(%s)", obj, i, raw.Interface(), raw.Kind()) + } + } + } + return list, nil +} + +// objectSliceType is the type of a slice of Objects +var objectSliceType = reflect.TypeOf([]runtime.Object{}) + +// SetList sets the given list object's Items member have the elements given in +// objects. +// Returns an error if list is not a List type (does not have an Items member), +// or if any of the objects are not of the right type. +func SetList(list runtime.Object, objects []runtime.Object) error { + itemsPtr, err := GetItemsPtr(list) + if err != nil { + return err + } + items, err := conversion.EnforcePtr(itemsPtr) + if err != nil { + return err + } + if items.Type() == objectSliceType { + items.Set(reflect.ValueOf(objects)) + return nil + } + slice := reflect.MakeSlice(items.Type(), len(objects), len(objects)) + for i := range objects { + dest := slice.Index(i) + src, err := conversion.EnforcePtr(objects[i]) + if err != nil { + return err + } + if src.Type().AssignableTo(dest.Type()) { + dest.Set(src) + } else if src.Type().ConvertibleTo(dest.Type()) { + dest.Set(src.Convert(dest.Type())) + } else { + return fmt.Errorf("item[%d]: can't assign or convert %v into %v", i, src.Type(), dest.Type()) + } + } + items.Set(slice) + return nil +} |