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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  import java.io.DataOutputStream;
    20  import java.io.IOException;
    21  import org.apache.bcel.util.ByteSequence;
    22
    23  /***
    24   * BIPUSH - Push byte on stack
    25   *
    26   * <PRE>Stack: ... -&gt; ..., value</PRE>
    27   *
    28   * @version $Id: BIPUSH.java 386056 2006-03-15 11:31:56Z tcurdt $
    29   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    30   */
    31  public class BIPUSH extends Instruction implements ConstantPushInstruction {
    32
    33      private byte b;
    34
    35
    36      /***
    37       * Empty constructor needed for the Class.newInstance() statement in
    38       * Instruction.readInstruction(). Not to be used otherwise.
    39       */
    40      BIPUSH() {
    41      }
    42
    43
    44      /*** Push byte on stack
    45       */
    46      public BIPUSH(byte b) {
    47          super(org.apache.bcel.Constants.BIPUSH, (short) 2);
    48          this.b = b;
    49      }
    50
    51
    52      /***
    53       * Dump instruction as byte code to stream out.
    54       */
    55      public void dump( DataOutputStream out ) throws IOException {
    56          super.dump(out);
    57          out.writeByte(b);
    58      }
    59
    60
    61      /***
    62       * @return mnemonic for instruction
    63       */
    64      public String toString( boolean verbose ) {
    65          return super.toString(verbose) + " " + b;
    66      }
    67
    68
    69      /***
    70       * Read needed data (e.g. index) from file.
    71       */
    72      protected void initFromFile( ByteSequence bytes, boolean wide ) throws IOException {
    73          length = 2;
    74          b = bytes.readByte();
    75      }
    76
    77
    78      public Number getValue() {
    79          return new Integer(b);
    80      }
    81
    82
    83      /*** @return Type.BYTE
    84       */
    85      public Type getType( ConstantPoolGen cp ) {
    86          return Type.BYTE;
    87      }
    88
    89
    90      /***
    91       * Call corresponding visitor method(s). The order is:
    92       * Call visitor methods of implemented interfaces first, then
    93       * call methods according to the class hierarchy in descending order,
    94       * i.e., the most specific visitXXX() call comes last.
    95       *
    96       * @param v Visitor object
    97       */
    98      public void accept( Visitor v ) {
    99          v.visitPushInstruction(this);
    100         v.visitStackProducer(this);
    101         v.visitTypedInstruction(this);
    102         v.visitConstantPushInstruction(this);
    103         v.visitBIPUSH(this);
    104     }
    105 }