// Copyright 2011 Tart. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview tart.dataProxy.CircularLocal XHR data proxy.
*/
goog.provide('tart.dataProxy.CircularLocal');
goog.require('tart.dataProxy.Local');
/**
*
* Base model to handle xhr requests
*
* @extends {tart.dataProxy.Local}
* @constructor
*/
tart.dataProxy.CircularLocal = function() {
goog.base(this);
};
goog.inherits(tart.dataProxy.CircularLocal, tart.dataProxy.Local);
/**
* Fetch data from xhr and call a function with returned data
* @param {Function=} callback function to call with returned data.
*/
tart.dataProxy.CircularLocal.prototype.fetch = function(callback) {
var fetchedData = this.getData();
var pagerParam = this.params.get('paginationParams');
if (!fetchedData || !pagerParam)
callback.call(this);
var offset = pagerParam.get('offset'),
limit = pagerParam.get('limit'),
length = fetchedData.length,
tmp = [],
pos;
if (limit > length) limit = length;
for (var i = offset, loopCount = offset + limit; i < loopCount; i++) {
pos = (i % length + length) % length;
tmp.push(fetchedData[pos]);
}
fetchedData = tmp;
callback.call(this, fetchedData);
};