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  }