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/**
* Priority lists allow you to create an indexed list that can be iterated through in a specific
* order.
*/
elgg.ElggPriorityList = function() {
this.length = 0;
this.priorities_ = [];
};
/**
* Inserts an element into the priority list at the priority specified.
*
* @param {Object} obj The object to insert
* @param {Number} opt_priority An optional priority to insert at.
*
* @return {Void}
*/
elgg.ElggPriorityList.prototype.insert = function(obj, opt_priority) {
var priority = 500;
if (arguments.length == 2 && opt_priority != undefined) {
priority = parseInt(opt_priority, 10);
}
priority = Math.max(priority, 0);
if (elgg.isUndefined(this.priorities_[priority])) {
this.priorities_[priority] = [];
}
this.priorities_[priority].push(obj);
this.length++;
};
/**
* Iterates through each element in order.
*
* Unlike every, this ignores the return value of the callback.
*
* @param {Function} callback The callback function to pass each element through. See
* Array.prototype.every() for details.
* @return {Object}
*/
elgg.ElggPriorityList.prototype.forEach = function(callback) {
elgg.assertTypeOf('function', callback);
var index = 0;
this.priorities_.forEach(function(elems) {
elems.forEach(function(elem) {
callback(elem, index++);
});
});
return this;
};
/**
* Iterates through each element in order.
*
* Unlike forEach, this returns the value of the callback and will break on false.
*
* @param {Function} callback The callback function to pass each element through. See
* Array.prototype.every() for details.
* @return {Object}
*/
elgg.ElggPriorityList.prototype.every = function(callback) {
elgg.assertTypeOf('function', callback);
var index = 0;
return this.priorities_.every(function(elems) {
return elems.every(function(elem) {
return callback(elem, index++);
});
});
};
/**
* Removes an element from the priority list
*
* @param {Object} obj The object to remove.
* @return {Void}
*/
elgg.ElggPriorityList.prototype.remove = function(obj) {
this.priorities_.forEach(function(elems) {
var index;
while ((index = elems.indexOf(obj)) !== -1) {
elems.splice(index, 1);
this.length--;
}
});
};
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