    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 * ACONST_NULL - Push null reference
    022 * <PRE>Stack: ... -&gt; ..., null</PRE>
    023 *
    024 * @version $Id: ACONST_NULL.java 1806200 2017-08-25 16:33:06Z ggregory $
    025 */
    026public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction {
    027
    028    /**
    029     * Push null reference
    030     */
    031    public ACONST_NULL() {
    032        super(org.apache.bcel.Const.ACONST_NULL, (short) 1);
    033    }
    034
    035
    036    /** @return Type.NULL
    037     */
    038    @Override
    039    public Type getType( final ConstantPoolGen cp ) {
    040        return Type.NULL;
    041    }
    042
    043
    044    /**
    045     * Call corresponding visitor method(s). The order is:
    046     * Call visitor methods of implemented interfaces first, then
    047     * call methods according to the class hierarchy in descending order,
    048     * i.e., the most specific visitXXX() call comes last.
    049     *
    050     * @param v Visitor object
    051     */
    052    @Override
    053    public void accept( final Visitor v ) {
    054        v.visitStackProducer(this);
    055        v.visitPushInstruction(this);
    056        v.visitTypedInstruction(this);
    057        v.visitACONST_NULL(this);
    058    }
    059}