75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
package options
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import (
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"sync"
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)
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// Options is used for initialisation
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type Options interface {
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// Initialise options
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Init(...Option) error
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// Options returns the current options
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Options() Options
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// Value returns an option value
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Value(k interface{}) (interface{}, bool)
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// The name for who these options exist
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String() string
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}
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// Values holds the set of option values and protects them
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type Values struct {
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sync.RWMutex
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values map[interface{}]interface{}
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}
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// Option gives access to options
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type Option func(o *Values) error
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// Get a value from options
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func (o *Values) Get(k interface{}) (interface{}, bool) {
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o.RLock()
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defer o.RUnlock()
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v, ok := o.values[k]
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return v, ok
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}
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// Set a value in the options
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func (o *Values) Set(k, v interface{}) error {
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o.Lock()
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defer o.Unlock()
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if o.values == nil {
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o.values = map[interface{}]interface{}{}
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}
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o.values[k] = v
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return nil
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}
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// SetOption executes an option
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func (o *Values) Option(op Option) error {
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return op(o)
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}
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// WithValue allows you to set any value within the options
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func WithValue(k, v interface{}) Option {
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return func(o *Values) error {
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return o.Set(k, v)
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}
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}
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// WithOption gives you the ability to create an option that accesses values
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func WithOption(o Option) Option {
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return o
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}
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// String sets the string
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func String(s string) Option {
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return WithValue(stringKey{}, s)
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}
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// NewOptions returns a new initialiser
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func NewOptions(opts ...Option) Options {
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o := new(defaultOptions)
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o.Init(opts...)
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return o
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}
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