var util = require('../src/util')
var Global = util.Global

module.exports = {
	name: 'sessionStorage',
	read: read,
	write: write,
	each: each,
	remove: remove,
	clearAll: clearAll
}

function sessionStorage() {
	return Global.sessionStorage
}

function read(key) {
	return sessionStorage().getItem(key)
}

function write(key, data) {
	return sessionStorage().setItem(key, data)
}

function each(fn) {
	for (var i = sessionStorage().length - 1; i >= 0; i--) {
		var key = sessionStorage().key(i)
		fn(read(key), key)
	}
}

function remove(key) {
	return sessionStorage().removeItem(key)
}

function clearAll() {
	return sessionStorage().clear()
}