1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.bcel.internal.generic; 23 24 25/** 26 * IFNULL - Branch if reference is not null 27 * 28 * <PRE>Stack: ..., reference -> ...</PRE> 29 * 30 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 31 */ 32public class IFNULL extends IfInstruction { 33 /** 34 * Empty constructor needed for the Class.newInstance() statement in 35 * Instruction.readInstruction(). Not to be used otherwise. 36 */ 37 IFNULL() {} 38 39 public IFNULL(InstructionHandle target) { 40 super(com.sun.org.apache.bcel.internal.Constants.IFNULL, target); 41 } 42 43 /** 44 * @return negation of instruction 45 */ 46 public IfInstruction negate() { 47 return new IFNONNULL(target); 48 } 49 50 51 /** 52 * Call corresponding visitor method(s). The order is: 53 * Call visitor methods of implemented interfaces first, then 54 * call methods according to the class hierarchy in descending order, 55 * i.e., the most specific visitXXX() call comes last. 56 * 57 * @param v Visitor object 58 */ 59 public void accept(Visitor v) { 60 v.visitStackConsumer(this); 61 v.visitBranchInstruction(this); 62 v.visitIfInstruction(this); 63 v.visitIFNULL(this); 64 } 65} 66