github.com/cloudfoundry-attic/cli-with-i18n@v6.32.1-0.20171002233121-7401370d3b85+incompatible/types/null_uint64.go (about)

     1  package types
     2  
     3  import (
     4  	"encoding/json"
     5  	"strconv"
     6  )
     7  
     8  // NullUint64 is a wrapper around uint64 values that can be null or an unint64.
     9  // Use IsSet to check if the value is provided, instead of checking against 0.
    10  type NullUint64 struct {
    11  	IsSet bool
    12  	Value uint64
    13  }
    14  
    15  // ParseStringValue is used to parse a user provided flag argument.
    16  func (n *NullUint64) ParseStringValue(val string) error {
    17  	if val == "" {
    18  		return nil
    19  	}
    20  
    21  	uint64Val, err := strconv.ParseUint(val, 10, 64)
    22  	if err != nil {
    23  		return err
    24  	}
    25  
    26  	n.Value = uint64Val
    27  	n.IsSet = true
    28  
    29  	return nil
    30  }
    31  
    32  func (n *NullUint64) UnmarshalJSON(rawJSON []byte) error {
    33  	var value json.Number
    34  	err := json.Unmarshal(rawJSON, &value)
    35  	if err != nil {
    36  		return err
    37  	}
    38  
    39  	if value.String() == "" {
    40  		n.Value = 0
    41  		n.IsSet = false
    42  		return nil
    43  	}
    44  
    45  	valueInt, err := strconv.ParseUint(value.String(), 10, 64)
    46  	if err != nil {
    47  		return err
    48  	}
    49  
    50  	n.Value = valueInt
    51  	n.IsSet = true
    52  
    53  	return nil
    54  }