1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 package com.sun.org.apache.bcel.internal.generic;
  21 
  22 /**
  23  * ICONST - Push value between -1, ..., 5, other values cause an exception
  24  *
  25  * <PRE>Stack: ... -&gt; ..., </PRE>
  26  *
  27  */
  28 public class ICONST extends Instruction implements ConstantPushInstruction {
  29 
  30     private int value;
  31 
  32 
  33     /**
  34      * Empty constructor needed for Instruction.readInstruction.
  35      * Not to be used otherwise.
  36      */
  37     ICONST() {
  38     }
  39 
  40 
  41     public ICONST(final int i) {
  42         super(com.sun.org.apache.bcel.internal.Const.ICONST_0, (short) 1);
  43         if ((i >= -1) && (i <= 5)) {
  44             super.setOpcode((short) (com.sun.org.apache.bcel.internal.Const.ICONST_0 + i)); // Even works for i == -1
  45         } else {
  46             throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
  47         }
  48         value = i;
  49     }
  50 
  51 
  52     @Override
  53     public Number getValue() {
  54         return Integer.valueOf(value);
  55     }
  56 
  57 
  58     /** @return Type.INT
  59      */
  60     @Override
  61     public Type getType( final ConstantPoolGen cp ) {
  62         return Type.INT;
  63     }
  64 
  65 
  66     /**
  67      * Call corresponding visitor method(s). The order is:
  68      * Call visitor methods of implemented interfaces first, then
  69      * call methods according to the class hierarchy in descending order,
  70      * i.e., the most specific visitXXX() call comes last.
  71      *
  72      * @param v Visitor object
  73      */
  74     @Override
  75     public void accept( final Visitor v ) {
  76         v.visitPushInstruction(this);
  77         v.visitStackProducer(this);
  78         v.visitTypedInstruction(this);
  79         v.visitConstantPushInstruction(this);
  80         v.visitICONST(this);
  81     }
  82 }