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 22 package com.sun.org.apache.bcel.internal.generic; 23 24 /** 25 * IFNULL - Branch if reference is not null 26 * 27 * <PRE>Stack: ..., reference -> ...</PRE> 28 * 29 * @version $Id: IFNULL.java 1747278 2016-06-07 17:28:43Z britter $ 30 */ 31 public class IFNULL extends IfInstruction { 32 33 /** 34 * Empty constructor needed for the Class.newInstance() statement in 35 * Instruction.readInstruction(). Not to be used otherwise. 36 */ 37 IFNULL() { 38 } 39 40 41 public IFNULL(final InstructionHandle target) { 42 super(com.sun.org.apache.bcel.internal.Const.IFNULL, target); 43 } 44 45 46 /** 47 * @return negation of instruction 48 */ 49 @Override 50 public IfInstruction negate() { 51 return new IFNONNULL(super.getTarget()); 52 } 53 54 55 /** 56 * Call corresponding visitor method(s). The order is: 57 * Call visitor methods of implemented interfaces first, then 58 * call methods according to the class hierarchy in descending order, 59 * i.e., the most specific visitXXX() call comes last. 60 * 61 * @param v Visitor object 62 */ 63 @Override 64 public void accept( final Visitor v ) { 65 v.visitStackConsumer(this); 66 v.visitBranchInstruction(this); 67 v.visitIfInstruction(this); 68 v.visitIFNULL(this); 69 } 70 }