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// Package configmap provides an abstraction for reading and writing config
package configmap
// Getter provides an interface to get config items
type Getter interface {
// Get should get an item with the key passed in and return
// the value. If the item is found then it should return true,
// otherwise false.
Get(key string) (value string, ok bool)
}
// Setter provides an interface to set config items
type Setter interface {
// Set should set an item into persistent config store.
Set(key, value string)
}
// Mapper provides an interface to read and write config
type Mapper interface {
Getter
Setter
}
// Map provides a wrapper around multiple Setter and
// Getter interfaces.
type Map struct {
setters []Setter
getters []Getter
}
// New returns an empty Map
func New() *Map {
return &Map{}
}
// AddGetter appends a getter onto the end of the getters
func (c *Map) AddGetter(getter Getter) *Map {
c.getters = append(c.getters, getter)
return c
}
// AddGetters appends multiple getters onto the end of the getters
func (c *Map) AddGetters(getters ...Getter) *Map {
c.getters = append(c.getters, getters...)
return c
}
// AddSetter appends a setter onto the end of the setters
func (c *Map) AddSetter(setter Setter) *Map {
c.setters = append(c.setters, setter)
return c
}
// Get gets an item with the key passed in and return the value from
// the first getter. If the item is found then it returns true,
// otherwise false.
func (c *Map) Get(key string) (value string, ok bool) {
for _, do := range c.getters {
value, ok = do.Get(key)
if ok {
return value, ok
}
}
return "", false
}
// Set sets an item into all the stored setters.
func (c *Map) Set(key, value string) {
for _, do := range c.setters {
do.Set(key, value)
}
}
// Simple is a simple Mapper for testing
type Simple map[string]string
// Get the value
func (c Simple) Get(key string) (value string, ok bool) {
value, ok = c[key]
return value, ok
}
// Set the value
func (c Simple) Set(key, value string) {
c[key] = value
}
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