github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/runtime/conversion.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  // Defines conversions between generic types and structs to map query strings
    18  // to struct objects.
    19  package runtime
    20  
    21  import (
    22  	"reflect"
    23  	"strconv"
    24  	"strings"
    25  
    26  	"k8s.io/kubernetes/pkg/conversion"
    27  )
    28  
    29  // JSONKeyMapper uses the struct tags on a conversion to determine the key value for
    30  // the other side. Use when mapping from a map[string]* to a struct or vice versa.
    31  func JSONKeyMapper(key string, sourceTag, destTag reflect.StructTag) (string, string) {
    32  	if s := destTag.Get("json"); len(s) > 0 {
    33  		return strings.SplitN(s, ",", 2)[0], key
    34  	}
    35  	if s := sourceTag.Get("json"); len(s) > 0 {
    36  		return key, strings.SplitN(s, ",", 2)[0]
    37  	}
    38  	return key, key
    39  }
    40  
    41  // DefaultStringConversions are helpers for converting []string and string to real values.
    42  var DefaultStringConversions = []interface{}{
    43  	convertStringSliceToString,
    44  	convertStringSliceToInt,
    45  	convertStringSliceToBool,
    46  	convertStringSliceToInt64,
    47  }
    48  
    49  func convertStringSliceToString(input *[]string, out *string, s conversion.Scope) error {
    50  	if len(*input) == 0 {
    51  		*out = ""
    52  	}
    53  	*out = (*input)[0]
    54  	return nil
    55  }
    56  
    57  func convertStringSliceToInt(input *[]string, out *int, s conversion.Scope) error {
    58  	if len(*input) == 0 {
    59  		*out = 0
    60  	}
    61  	str := (*input)[0]
    62  	i, err := strconv.Atoi(str)
    63  	if err != nil {
    64  		return err
    65  	}
    66  	*out = i
    67  	return nil
    68  }
    69  
    70  // converStringSliceToBool will convert a string parameter to boolean.
    71  // Only the absence of a value, a value of "false", or a value of "0" resolve to false.
    72  // Any other value (including empty string) resolves to true.
    73  func convertStringSliceToBool(input *[]string, out *bool, s conversion.Scope) error {
    74  	if len(*input) == 0 {
    75  		*out = false
    76  		return nil
    77  	}
    78  	switch strings.ToLower((*input)[0]) {
    79  	case "false", "0":
    80  		*out = false
    81  	default:
    82  		*out = true
    83  	}
    84  	return nil
    85  }
    86  
    87  func convertStringSliceToInt64(input *[]string, out *int64, s conversion.Scope) error {
    88  	if len(*input) == 0 {
    89  		*out = 0
    90  	}
    91  	str := (*input)[0]
    92  	i, err := strconv.ParseInt(str, 10, 64)
    93  	if err != nil {
    94  		return err
    95  	}
    96  	*out = i
    97  	return nil
    98  }