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