    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}