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dom.js
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dom.js
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/**
* dom storage adapter
* ===
* - originally authored by Joseph Pecoraro
*
*/
//
// TODO does it make sense to be chainable all over the place?
// chainable: nuke, remove, all, get, save, all
// not chainable: valid, keys
//
Lawnchair.adapter('dom', (function() {
var storage = window.localStorage
// the indexer is an encapsulation of the helpers needed to keep an ordered index of the keys
var indexer = function(name) {
return {
// the key
key: name + '._index_',
// returns the index
all: function() {
var a = JSON.parse(storage.getItem(this.key))
if (a === null) storage.setItem(this.key, JSON.stringify([])) // lazy init
return JSON.parse(storage.getItem(this.key))
},
// adds a key to the index
add: function (key) {
var a = this.all()
a.push(key)
storage.setItem(this.key, JSON.stringify(a))
},
// deletes a key from the index
del: function (key) {
var a = this.all(), r = []
// FIXME this is crazy inefficient but I'm in a strata meeting and half concentrating
for (var i = 0, l = a.length; i < l; i++) {
if (a[i] != key) r.push(a[i])
}
storage.setItem(this.key, JSON.stringify(r))
},
// returns index for a key
find: function (key) {
var a = this.all()
for (var i = 0, l = a.length; i < l; i++) {
if (key === a[i]) return i
}
return false
}
}
}
// adapter api
return {
// ensure we are in an env with localStorage
valid: function () {
return !!storage
},
init: function (options, callback) {
this.indexer = indexer(this.name)
if (callback) this.fn(this.name, callback).call(this, this)
},
save: function (obj, callback) {
var key = obj.key ? this.name + '.' + obj.key : this.name + '.' + this.uuid()
// if the key is not in the index push it on
if (this.indexer.find(key) === false) this.indexer.add(key)
// now we kil the key and use it in the store colleciton
delete obj.key;
storage.setItem(key, JSON.stringify(obj))
if (callback) {
obj.key = key.replace(this.name + '.', '')
this.lambda(callback).call(this, obj)
}
return this
},
batch: function (ary, callback) {
var saved = []
// not particularily efficient but this is more for sqlite situations
for (var i = 0, l = ary.length; i < l; i++) {
this.save(ary[i], function(r){
saved.push(r)
})
}
if (callback) this.lambda(callback).call(this, saved)
return this
},
// accepts [options], callback
keys: function(callback) {
if (callback) {
var name = this.name
, keys = this.indexer.all().map(function(r){ return r.replace(name + '.', '') })
this.fn('keys', callback).call(this, keys)
}
return this // TODO options for limit/offset, return promise
},
get: function (key, callback) {
if (this.isArray(key)) {
var r = []
for (var i = 0, l = key.length; i < l; i++) {
var k = this.name + '.' + key[i]
, obj = JSON.parse(storage.getItem(k))
if (obj) {
obj.key = key[i]
r.push(obj)
}
}
if (callback) this.lambda(callback).call(this, r)
} else {
var k = this.name + '.' + key
, obj = JSON.parse(storage.getItem(k))
if (obj) obj.key = key
if (callback) this.lambda(callback).call(this, obj)
}
return this
},
// NOTE adapters cannot set this.__results but plugins do
// this probably should be reviewed
all: function (callback) {
var idx = this.indexer.all()
, r = []
, o
, k
for (var i = 0, l = idx.length; i < l; i++) {
k = idx[i] //v
o = JSON.parse(storage.getItem(k))
o.key = k.replace(this.name + '.', '')
r.push(o)
}
if (callback) this.fn(this.name, callback).call(this, r)
return this
},
remove: function (keyOrObj, callback) {
var key = this.name + '.' + (typeof keyOrObj === 'string' ? keyOrObj : keyOrObj.key)
this.indexer.del(key)
storage.removeItem(key)
if (callback) this.lambda(callback).call(this)
return this
},
nuke: function (callback) {
this.all(function(r) {
for (var i = 0, l = r.length; i < l; i++) {
this.remove(r[i]);
}
if (callback) this.lambda(callback).call(this)
})
return this
}
}})());