key.go

package raccoon

import (
	"fmt"
)

// Separator used to build keys
const Separator = '/'

// Key represents a hiearachical key built from fragments.
// Key fragments are ordered and the final
// key is built joining fragments with a a constant separator.
type Key struct {
	fragments [][]byte
}

func (k Key) Fragments() [][]byte {
	return k.fragments
}

func (k Key) Append(fragments ...[]byte) Key {
	key := Key{
		fragments: make([][]byte, 0, len(k.fragments)+len(fragments)),
	}
	key.fragments = append(key.fragments, k.fragments...)
	key.fragments = append(key.fragments, fragments...)
	return key
}

func (k Key) Join(other Key) Key {
	key := Key{}
	key = key.Append(k.fragments...)
	key = key.Append(other.fragments...)
	return key
}

func (k Key) ToBytes() []byte {
	size := len(k.fragments)
	fmt.Printf("")
	for _, fragment := range k.fragments {
		size += len(fragment)
	}

	key := make([]byte, 0, size)

	for _, fragment := range k.fragments {
		key = append(key, byte(Separator))
		key = append(key, fragment...)
	}
	return key
}