etherpad-lite/node/utils/AttributePoolFactory.js

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2011-03-26 14:10:41 +01:00
/**
2011-05-30 16:53:11 +02:00
* This code represents the Attribute Pool Object of the original Etherpad.
* 90% of the code is still like in the original Etherpad
* Look at https://github.com/ether/pad/blob/master/infrastructure/ace/www/easysync2.js
* You can find a explanation what a attribute pool is here:
* https://github.com/Pita/etherpad-lite/blob/master/doc/easysync/easysync-notes.txt
*/
/*
* Copyright 2009 Google Inc., 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
2011-03-26 14:10:41 +01:00
*
* 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.
*/
exports.createAttributePool = function () {
var p = {};
p.numToAttrib = {}; // e.g. {0: ['foo','bar']}
p.attribToNum = {}; // e.g. {'foo,bar': 0}
p.nextNum = 0;
p.putAttrib = function (attrib, dontAddIfAbsent) {
var str = String(attrib);
if (str in p.attribToNum) {
return p.attribToNum[str];
}
if (dontAddIfAbsent) {
return -1;
}
var num = p.nextNum++;
p.attribToNum[str] = num;
p.numToAttrib[num] = [String(attrib[0] || ''), String(attrib[1] || '')];
return num;
};
p.getAttrib = function (num) {
var pair = p.numToAttrib[num];
if (!pair) {
return pair;
}
return [pair[0], pair[1]]; // return a mutable copy
};
p.getAttribKey = function (num) {
var pair = p.numToAttrib[num];
if (!pair) return '';
return pair[0];
};
p.getAttribValue = function (num) {
var pair = p.numToAttrib[num];
if (!pair) return '';
return pair[1];
};
p.eachAttrib = function (func) {
for (var n in p.numToAttrib) {
var pair = p.numToAttrib[n];
func(pair[0], pair[1]);
}
};
p.toJsonable = function () {
return {
numToAttrib: p.numToAttrib,
nextNum: p.nextNum
};
};
p.fromJsonable = function (obj) {
p.numToAttrib = obj.numToAttrib;
p.nextNum = obj.nextNum;
p.attribToNum = {};
for (var n in p.numToAttrib) {
p.attribToNum[String(p.numToAttrib[n])] = Number(n);
}
return p;
};
return p;
}