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Overview ¶
Package types provides versions of Go's built-in types that better support web-services.
Serialising data into and out of some of Go's native types can be problematic. This is because the zero value of numbers, bools and strings are not nil, but 0, false and "" respectively. This means the intent of the original data can be lost. Did the caller provider 'false' or just forget to specify a value?
A similar problem is solved with Go's sql.NullXXX types for handling null values in and out of databases, but those types are not suitable for use with web services.
Grantic defines a set of four 'nilable' types for handling int64, float64, bool and string values that might not always have a value associated with them. There is deep support for these types throughout Granitic including JSON and XML marhsalling/unmarshalling, path and query parameter binding, validation, query templating and RDBMS access. Developers are strongly encouraged to use nilable types instead of native types wherever possible.
This package also defines a number of simple implmentations of a 'set'. Caution should be used when using these types in your own application as they are not goroutine safe or intended to store large numbers of strings.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Nilable ¶
type Nilable interface {
// Convert the contained value to JSON or nil if no value is set.
MarshalJSON() ([]byte, error)
// Populate the type with the supplied JSON value or ignore if value is JSON null
UnmarshalJSON(b []byte) error
// Whether or not the value in this type was explicitly set
IsSet() bool
}
Implemented by a type that acts as a wrapper round a native type to track whether a value has actually been set.
type NilableBool ¶
type NilableBool struct {
// contains filtered or unexported fields
}
A bool where it can be determined if false is an explicitly set value, or just the default zero value.
func NewNilableBool ¶
func NewNilableBool(b bool) *NilableBool
Create a new NilableBool with the supplied value.
func (*NilableBool) Bool ¶
func (nb *NilableBool) Bool() bool
The currently stored value (whether or not it has been explicitly set).
func (*NilableBool) MarshalJSON ¶
func (nb *NilableBool) MarshalJSON() ([]byte, error)
See Nilable.MarshalJSON
func (*NilableBool) Set ¶
func (nb *NilableBool) Set(v bool)
Set sets the contained value to the supplied value and makes IsSet true even if the supplied value is false.
func (*NilableBool) UnmarshalJSON ¶
func (nb *NilableBool) UnmarshalJSON(b []byte) error
See Nilable.UnmarshalJSON
type NilableFloat64 ¶
type NilableFloat64 struct {
// contains filtered or unexported fields
}
An float64 where it can be determined if 0 is an explicitly set value, or just the default zero value.
func NewNilableFloat64 ¶
func NewNilableFloat64(f float64) *NilableFloat64
Create a new NilableFloat64 with the supplied value.
func (*NilableFloat64) Float64 ¶
func (ni *NilableFloat64) Float64() float64
The currently stored value (whether or not it has been explicitly set).
func (*NilableFloat64) MarshalJSON ¶
func (nf *NilableFloat64) MarshalJSON() ([]byte, error)
See Nilable.MarshalJSON
func (*NilableFloat64) Set ¶
func (nf *NilableFloat64) Set(v float64)
Set sets the contained value to the supplied value and makes IsSet true even if the supplied value is 0.
func (*NilableFloat64) UnmarshalJSON ¶
func (nf *NilableFloat64) UnmarshalJSON(b []byte) error
See Nilable.UnmarshalJSON
type NilableInt64 ¶
type NilableInt64 struct {
// contains filtered or unexported fields
}
An int64 where it can be determined if 0 is an explicitly set value, or just the default zero value.
func NewNilableInt64 ¶
func NewNilableInt64(i int64) *NilableInt64
Create a new NilableInt64 with the supplied value.
func (*NilableInt64) Int64 ¶
func (ni *NilableInt64) Int64() int64
The currently stored value (whether or not it has been explicitly set).
func (*NilableInt64) MarshalJSON ¶
func (ni *NilableInt64) MarshalJSON() ([]byte, error)
See Nilable.MarshalJSON
func (*NilableInt64) Set ¶
func (ni *NilableInt64) Set(v int64)
Set sets the contained value to the supplied value and makes IsSet true even if the supplied value is 0.
func (*NilableInt64) UnmarshalJSON ¶
func (ni *NilableInt64) UnmarshalJSON(b []byte) error
See Nilable.UnmarshalJSON
type NilableString ¶
type NilableString struct {
// contains filtered or unexported fields
}
A string where it can be determined if "" is an explicitly set value, or just the default zero value
func NewNilableString ¶
func NewNilableString(v string) *NilableString
Create a new NilableString with the supplied value.
func (*NilableString) MarshalJSON ¶
func (ns *NilableString) MarshalJSON() ([]byte, error)
See Nilable.MarshalJSON
func (*NilableString) Set ¶
func (ns *NilableString) Set(v string)
Set sets the contained value to the supplied value and makes IsSet true even if the supplied value is the empty string.
func (*NilableString) String ¶
func (ns *NilableString) String() string
The currently stored value (whether or not it has been explicitly set).
func (*NilableString) UnmarshalJSON ¶
func (ns *NilableString) UnmarshalJSON(b []byte) error
See Nilable.UnmarshalJSON
type OrderedStringSet ¶
type OrderedStringSet struct {
// contains filtered or unexported fields
}
This type is not goroutine safe and not recommended for the storage of large number of strings.
func NewEmptyOrderedStringSet ¶
func NewEmptyOrderedStringSet() *OrderedStringSet
An empty OrderedStringSet
func NewOrderedStringSet ¶
func NewOrderedStringSet(m []string) *OrderedStringSet
An OrderedStringSet with the supplied strings added to the new set in the provided order.
func (*OrderedStringSet) AddAll ¶
func (os *OrderedStringSet) AddAll(ss StringSet)
See StringSet.AddAll
func (*OrderedStringSet) Contains ¶
func (os *OrderedStringSet) Contains(m string) bool
See StringSet.Contains
func (*OrderedStringSet) Contents ¶
func (os *OrderedStringSet) Contents() []string
Contents returns the all of the strings in the set in the same order in which they were added.
type StringSet ¶
type StringSet interface {
// Whether or not the set contains the supplied string.
Contains(m string) bool
// Add the supplied string to the set. If the set already contains the supplied value, it is ignored.
Add(s string)
// The members of the set a string slice.
Contents() []string
// The number of members of the set.
Size() int
// Add all the members of the supplied set to this set.
AddAll(os StringSet)
}
Common behaviour for an ordered or unordered set of strings.
type UnorderedStringSet ¶
type UnorderedStringSet struct {
// contains filtered or unexported fields
}
A set of strings where the order in which the strings were added to the set is not recorded.
This type is not goroutine safe and not recommended for the storage large number of strings.
func NewUnorderedStringSet ¶
func NewUnorderedStringSet(m []string) *UnorderedStringSet
A new UnorderedStringSet seeded with the supplied strings.
func (*UnorderedStringSet) AddAll ¶
func (us *UnorderedStringSet) AddAll(ss StringSet)
See StringSet.AddAll
func (*UnorderedStringSet) Contains ¶
func (ss *UnorderedStringSet) Contains(m string) bool
See StringSet.Contains
func (*UnorderedStringSet) Contents ¶
func (ss *UnorderedStringSet) Contents() []string
Contents returns all of the strings contained in this set in a nondeterministic order
Source Files