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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)
************************************************************************ */
/* ************************************************************************
#module(core)
************************************************************************ */
/**
* Helper functions to handle Object as a Hash map.
*/
qx.OO.defineClass("qx.lang.Object");
/**
* Check if the hash has any keys
*
* @param map {Object} the map to check
* @return {Boolean} whether the map has any keys
*/
qx.Class.isEmpty = function(map)
{
for (var s in map) {
return false;
}
return true;
};
/**
* Check whether the number of objects in the maps is at least "lenght"
*
* @param map {Object} the map to check
* @param length {Integer} minimum number of objects in the map
* @return {Boolean} whether the map contains at least "lenght" objects.
*/
qx.Class.hasMinLength = function(map, length)
{
var i=0;
for (var s in map)
{
if ((++i)>=length) {
return true;
}
}
return false;
};
/**
* Get the number of objects in the map
*
* @param map {Object} the map
* @return {Integer} number of objects in the map
*/
qx.Class.getLength = function(map)
{
var i=0;
for (var s in map) {
i++;
}
return i;
};
/**
* Get the keys of a map as array
*
* @param map {Object} the map
* @return {Array} array of the keys of the map
*/
qx.Class.getKeys = function(map)
{
var r = [];
for (var s in map) {
r.push(s);
}
return r;
};
/**
* Get the keys of a map as string
*
* @param map {Object} the map
* @return {String} String of the keys of the map
* The keys are separated by ", "
*/
qx.Class.getKeysAsString = function(map) {
return qx.lang.Object.getKeys(map).join(", ");
};
/**
* Get the values of a map as array
*
* @param map {Object} the map
* @return {Array} array of the values of the map
*/
qx.Class.getValues = function(map)
{
var r = [];
for (var s in map) {
r.push(map[s]);
}
return r;
};
/**
* Merge two objects.
*
* If the Objects both have the same key, the value of the second object is taken.
*
* @param vObjectA {Object} target object
* @param vObjectB {Object} object to be merged
* @return {Object} ObjectA with merged values from ObjectB
*/
qx.Class.mergeWith = function(vObjectA, vObjectB)
{
for (var vKey in vObjectB) {
vObjectA[vKey] = vObjectB[vKey];
}
return vObjectA;
};
/**
* Merge two objects. Existing values will not be overwritten.
*
* If the Objects both have the same key, the value of the first object is taken.
*
* @param vObjectA {Object} target object
* @param vObjectB {Object} object to be merged
* @return {Object} vObjectA with merged values from vObjectB
*/
qx.Class.carefullyMergeWith = function(vObjectA, vObjectB) {
for (var vKey in vObjectB)
{
if (typeof vObjectA[vKey] === "undefined") {
vObjectA[vKey] = vObjectB[vKey];
}
}
return vObjectA;
};
/**
* Merge a number of objects.
*
* @param vObjectA {Object} target object
* @param varargs {Object} variable number of objects to merged with vObjectA
* @return {Object} vObjectA with merged values from the other objects
*/
qx.Class.merge = function(vObjectA, varargs)
{
var vLength = arguments.length;
for (var i=1; i<vLength; i++) {
qx.lang.Object.mergeWith(vObjectA, arguments[i]);
}
return vObjectA;
};
/**
* Return a copy of an Object
*
* @param vObject {Object} Object to copy
* @return {Object} copy of vObject
*/
qx.Class.copy = function(vObject) {
return qx.lang.Object.mergeWith({}, vObject);
};
/**
* Inverts a Map by exchanging the keys with the values.
* If the map has the same values for different keys, information will get lost.
* The values will be converted to Strings using the toString methos.
*
* @param vObject {Object} Map to invert
* @return {Object} inverted Map
*/
qx.Class.invert = function(vObject) {
var result = {};
for (var key in vObject) {
var value = vObject[key].toString();
result[value] = key;
}
return result;
}
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