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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2004-2007 1&1 Internet AG, Germany, http://www.1and1.org
License:
LGPL: http://www.gnu.org/licenses/lgpl.html
EPL: http://www.eclipse.org/org/documents/epl-v10.php
See the LICENSE file in the project's top-level directory for details.
Authors:
* Sebastian Werner (wpbasti)
* Andreas Ecker (ecker)
************************************************************************ */
/* ************************************************************************
************************************************************************ */
/**
* Helper for qx.manager.selection.SelectionManager, contains data for selections
*
* @param vManager {Object} a class which implements a getItemHashCode(oItem) method
*/
qx.OO.defineClass("qx.type.Selection", qx.core.Object,
function(vManager)
{
qx.core.Object.call(this);
this._manager = vManager;
this.removeAll();
});
/*
---------------------------------------------------------------------------
USER METHODS
---------------------------------------------------------------------------
*/
/**
* Add an item to the selection
*
* @param oItem {var} item to add
*/
qx.Proto.add = function(oItem) {
this._storage[this.getItemHashCode(oItem)] = oItem;
};
/**
* Remove an item from the selection
*
* @param oItem {var} item to remove
*/
qx.Proto.remove = function(oItem) {
delete this._storage[this.getItemHashCode(oItem)];
};
/**
* Remove all items from the selection
*/
qx.Proto.removeAll = function() {
this._storage = {};
};
/**
* Check whether the selection contains a given item
*
* @param oItem {var} item to check for
* @return {Boolean} whether the selection contains the item
*/
qx.Proto.contains = function(oItem) {
return this.getItemHashCode(oItem) in this._storage;
};
/**
* Convert selection to an array
*
* @return {Array} array representation of the selection
*/
qx.Proto.toArray = function()
{
var res = [];
for (var key in this._storage) {
res.push(this._storage[key]);
}
return res;
};
/**
* Return first element of the Selection
*
* @return {var} first item of the selection
*/
qx.Proto.getFirst = function()
{
for (var key in this._storage) {
return this._storage[key];
}
}
/**
* Get a string representation of the Selection. The return value can be used to compare selections.
*
* @return {String} string representation of the Selection
*/
qx.Proto.getChangeValue = function()
{
var sb = [];
for (var hc in this._storage) {
sb.push(hc);
}
sb.sort();
return sb.join(";");
};
/**
* Compute a hash code for an item using the manager
*
* @param oItem {var} the item
* @return {var} unique hash code for the item
*/
qx.Proto.getItemHashCode = function(oItem) {
return this._manager.getItemHashCode(oItem);
};
/**
* Whether the selection is empty
*
* @return {Boolean} whether the selection is empty
*/
qx.Proto.isEmpty = function() {
return qx.lang.Object.isEmpty(this._storage);
};
/*
---------------------------------------------------------------------------
DISPOSER
---------------------------------------------------------------------------
*/
/**
* Destructor
*/
qx.Proto.dispose = function()
{
if (this.getDisposed()) {
return;
}
this._storage = null;
this._manager = null;
qx.core.Object.prototype.dispose.call(this);
};
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