mxHierarchicalLayout.prototype.execute=function(a,b){this.parent=a;var c=this.graph.model;this.edgesCache=new mxDictionary;this.edgeSourceTermCache=new mxDictionary;this.edgesTargetTermCache=new mxDictionary;null==b||b instanceof Array||(b=[b]);if(null!=b||null!=a){this.parentY=this.parentX=null;if(a!=this.root&&null!=c.isVertex(a)&&this.maintainParentLocation){var d=this.graph.getCellGeometry(a);null!=d&&(this.parentX=d.x,this.parentY=d.y)}if(null!=b){for(var e=[],f=0;f<b.length;f++)(null!=a?c.isAncestor(a,