    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.generic;
    019
    020/**
    021 * IFNONNULL - Branch if reference is not null
    022 *
    023 * <PRE>Stack: ..., reference -&gt; ...</PRE>
    024 *
    025 */
    026public class IFNONNULL extends IfInstruction {
    027
    028    /**
    029     * Empty constructor needed for Instruction.readInstruction.
    030     * Not to be used otherwise.
    031     */
    032    IFNONNULL() {
    033    }
    034
    035
    036    public IFNONNULL(final InstructionHandle target) {
    037        super(org.apache.bcel.Const.IFNONNULL, target);
    038    }
    039
    040
    041    /**
    042     * @return negation of instruction
    043     */
    044    @Override
    045    public IfInstruction negate() {
    046        return new IFNULL(super.getTarget());
    047    }
    048
    049
    050    /**
    051     * Call corresponding visitor method(s). The order is:
    052     * Call visitor methods of implemented interfaces first, then
    053     * call methods according to the class hierarchy in descending order,
    054     * i.e., the most specific visitXXX() call comes last.
    055     *
    056     * @param v Visitor object
    057     */
    058    @Override
    059    public void accept( final Visitor v ) {
    060        v.visitStackConsumer(this);
    061        v.visitBranchInstruction(this);
    062        v.visitIfInstruction(this);
    063        v.visitIFNONNULL(this);
    064    }
    065}