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| var BaseAccessor = require("./base");
var _set = require("../utils/set");
function POJOAccessor() {
BaseAccessor.call(this);
this._getters = {};
this._callers = {};
this._watchers = [];
}
module.exports = BaseAccessor.extend(POJOAccessor, {
/**
*/
castObject: function(object) { return object; },
/**
*/
call: function(object, path, params) {
var caller;
Eif (!(caller = this._callers[path])) {
var ctxPath = ["this"].concat(path.split("."));
ctxPath.pop();
ctxPath = ctxPath.join(".");
caller = this._callers[path] = new Function("params", "return this." + path + ".apply(" + ctxPath + ", params);");
}
try {
var ret = caller.call(object, params);
this.applyChanges();
return ret;
} catch (e) {
return void 0;
}
},
/**
*/
get: function(object, path) {
var pt = typeof path !== "string" ? path.join(".") : path;
var getter;
if (!(getter = this._getters[pt])) {
getter = this._getters[pt] = new Function("return this." + pt);
}
// is undefined - fugly, but works for this test.
try {
return getter.call(object);
} catch (e) {
return void 0;
}
},
/**
*/
set: function(object, path, value) {
Eif (typeof path === "string") path = path.split(".");
var ret = _set(object, path, value);
this.applyChanges();
return ret;
},
/**
*/
watchProperty: function(object, path, listener) {
var self = this;
var currentValue;
var firstCall = true;
return this._addWatcher(function() {
var newValue = self.get(object, path);
if (!firstCall && newValue === currentValue && typeof newValue !== "function") return;
firstCall = false;
var oldValue = currentValue;
currentValue = newValue;
listener(newValue, currentValue);
});
},
/**
*/
_addWatcher: function(applyChanges) {
var self = this;
var watcher = {
apply: applyChanges,
trigger: applyChanges,
dispose: function() {
var i = self._watchers.indexOf(watcher);
if (~i) self._watchers.splice(i, 1);
}
};
this._watchers.push(watcher);
return watcher;
},
/**
*/
watchEvent: function(object, event, listener) {
if (Object.prototype.toString.call(object) === "[object Array]" && event === "change") {
return this._watchArrayChangeEvent(object, listener);
}
return {
dispose: function() { }
};
},
/**
*/
_watchArrayChangeEvent: function(object, listener) {
var copy = object.concat();
return this._addWatcher(function() {
var hasChanged = object.length !== copy.length;
Iif (!hasChanged) {
for (var i = 0, n = copy.length; i < n; i++) {
hasChanged = (copy[i] !== object[i]);
if (hasChanged) break;
}
}
Eif (hasChanged) {
copy = object.concat();
listener();
}
});
},
/**
*/
normalizeCollection: function(collection) {
return collection;
},
/**
*/
normalizeObject: function(object) {
return object;
},
/**
* DEPRECATED
*/
apply: function() {
this.applyChanges();
},
/**
*/
applyChanges: function() {
// if (this.__applyingChanges) return;
// this.__applyingChanges = true;
for (var i = 0, n = this._watchers.length; i < n; i++) {
this._watchers[i].apply();
}
// this.__applyingChanges = false;
}
});
|