Here you can find the source of nvl(T o, T valueIfNull)
public static <T> T nvl(T o, T valueIfNull)
//package com.java2s; /**//from w ww . ja va 2 s . c om * The contents of this file are subject to the OpenMRS Public License * Version 1.0 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://license.openmrs.org * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the * License for the specific language governing rights and limitations * under the License. * * Copyright (C) OpenMRS, LLC. All Rights Reserved. */ public class Main { public static <T> T nvl(T o, T valueIfNull) { if (isEmpty(o)) { return valueIfNull; } return o; } public static boolean isEmpty(Object o) { return o == null || o.equals(""); } }