1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.generic;
  23 
  24 import java.io.DataOutputStream;
  25 import java.io.IOException;
  26 
  27 import com.sun.org.apache.bcel.internal.util.ByteSequence;
  28 
  29 /**
  30  * TABLESWITCH - Switch within given range of values, i.e., low..high
  31  *
  32  * @version $Id$
  33  * @see SWITCH
  34  */
  35 public class TABLESWITCH extends Select {
  36 
  37     /**
  38      * Empty constructor needed for Instruction.readInstruction.
  39      * Not to be used otherwise.
  40      */
  41     TABLESWITCH() {
  42     }
  43 
  44 
  45     /**
  46      * @param match sorted array of match values, match[0] must be low value,
  47      * match[match_length - 1] high value
  48      * @param targets where to branch for matched values
  49      * @param defaultTarget default branch
  50      */
  51     public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
  52         super(com.sun.org.apache.bcel.internal.Const.TABLESWITCH, match, targets, defaultTarget);
  53         /* Alignment remainder assumed 0 here, until dump time */
  54         final short _length = (short) (13 + getMatch_length() * 4);
  55         super.setLength(_length);
  56         setFixed_length(_length);
  57     }
  58 
  59 
  60     /**
  61      * Dump instruction as byte code to stream out.
  62      * @param out Output stream
  63      */
  64     @Override
  65     public void dump( final DataOutputStream out ) throws IOException {
  66         super.dump(out);
  67         final int _match_length = getMatch_length();
  68         final int low = (_match_length > 0) ? super.getMatch(0) : 0;
  69         out.writeInt(low);
  70         final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0;
  71         out.writeInt(high);
  72         for (int i = 0; i < _match_length; i++) {
  73             out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
  74         }
  75     }
  76 
  77 
  78     /**
  79      * Read needed data (e.g. index) from file.
  80      */
  81     @Override
  82     protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
  83         super.initFromFile(bytes, wide);
  84         final int low = bytes.readInt();
  85         final int high = bytes.readInt();
  86         final int _match_length = high - low + 1;
  87         setMatch_length(_match_length);
  88         final short _fixed_length = (short) (13 + _match_length * 4);
  89         setFixed_length(_fixed_length);
  90         super.setLength((short) (_fixed_length + super.getPadding()));
  91         super.setMatches(new int[_match_length]);
  92         super.setIndices(new int[_match_length]);
  93         super.setTargets(new InstructionHandle[_match_length]);
  94         for (int i = 0; i < _match_length; i++) {
  95             super.setMatch(i, low + i);
  96             super.setIndices(i, bytes.readInt());
  97         }
  98     }
  99 
 100 
 101     /**
 102      * Call corresponding visitor method(s). The order is:
 103      * Call visitor methods of implemented interfaces first, then
 104      * call methods according to the class hierarchy in descending order,
 105      * i.e., the most specific visitXXX() call comes last.
 106      *
 107      * @param v Visitor object
 108      */
 109     @Override
 110     public void accept( final Visitor v ) {
 111         v.visitVariableLengthInstruction(this);
 112         v.visitStackConsumer(this);
 113         v.visitBranchInstruction(this);
 114         v.visitSelect(this);
 115         v.visitTABLESWITCH(this);
 116     }
 117 }