private static int count=0;
public CommonTransform getTransform() throws InvalidFormulaException{
CommonTransform t=getTransformFromDefinition();
if (t!=null) return t;
if (formulaText==null&&subTransforms==null) return null;
StringBuffer classText=new StringBuffer();
classText.append("package com.projity.grouping.core.transform.sorting;\n");
classText.append("import com.projity.grouping.core.Node;\n");