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    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.generic;
    18
    19  /***
    20   * ACONST_NULL - Push null reference
    21   * <PRE>Stack: ... -&gt; ..., null</PRE>
    22   *
    23   * @version $Id: ACONST_NULL.java 386056 2006-03-15 11:31:56Z tcurdt $
    24   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    25   */
    26  public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction {
    27
    28      /***
    29       * Push null reference
    30       */
    31      public ACONST_NULL() {
    32          super(org.apache.bcel.Constants.ACONST_NULL, (short) 1);
    33      }
    34
    35
    36      /*** @return Type.NULL
    37       */
    38      public Type getType( ConstantPoolGen cp ) {
    39          return Type.NULL;
    40      }
    41
    42
    43      /***
    44       * Call corresponding visitor method(s). The order is:
    45       * Call visitor methods of implemented interfaces first, then
    46       * call methods according to the class hierarchy in descending order,
    47       * i.e., the most specific visitXXX() call comes last.
    48       *
    49       * @param v Visitor object
    50       */
    51      public void accept( Visitor v ) {
    52          v.visitStackProducer(this);
    53          v.visitPushInstruction(this);
    54          v.visitTypedInstruction(this);
    55          v.visitACONST_NULL(this);
    56      }
    57  }