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  * @see SWITCH
  33  */
  34 public class TABLESWITCH extends Select {
  35 
  36     /**
  37      * Empty constructor needed for Instruction.readInstruction.
  38      * Not to be used otherwise.
  39      */
  40     TABLESWITCH() {
  41     }
  42 
  43 
  44     /**
  45      * @param match sorted array of match values, match[0] must be low value,
  46      * match[match_length - 1] high value
  47      * @param targets where to branch for matched values
  48      * @param defaultTarget default branch
  49      */
  50     public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
  51         super(com.sun.org.apache.bcel.internal.Const.TABLESWITCH, match, targets, defaultTarget);
  52         /* Alignment remainder assumed 0 here, until dump time */
  53         final short _length = (short) (13 + getMatch_length() * 4);
  54         super.setLength(_length);
  55         setFixed_length(_length);
  56     }
  57 
  58 
  59     /**
  60      * Dump instruction as byte code to stream out.
  61      * @param out Output stream
  62      */
  63     @Override
  64     public void dump( final DataOutputStream out ) throws IOException {
  65         super.dump(out);
  66         final int _match_length = getMatch_length();
  67         final int low = (_match_length > 0) ? super.getMatch(0) : 0;
  68         out.writeInt(low);
  69         final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0;
  70         out.writeInt(high);
  71         for (int i = 0; i < _match_length; i++) {
  72             out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
  73         }
  74     }
  75 
  76 
  77     /**
  78      * Read needed data (e.g. index) from file.
  79      */
  80     @Override
  81     protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
  82         super.initFromFile(bytes, wide);
  83         final int low = bytes.readInt();
  84         final int high = bytes.readInt();
  85         final int _match_length = high - low + 1;
  86         setMatch_length(_match_length);
  87         final short _fixed_length = (short) (13 + _match_length * 4);
  88         setFixed_length(_fixed_length);
  89         super.setLength((short) (_fixed_length + super.getPadding()));
  90         super.setMatches(new int[_match_length]);
  91         super.setIndices(new int[_match_length]);
  92         super.setTargets(new InstructionHandle[_match_length]);
  93         for (int i = 0; i < _match_length; i++) {
  94             super.setMatch(i, low + i);
  95             super.setIndices(i, bytes.readInt());
  96         }
  97     }
  98 
  99 
 100     /**
 101      * Call corresponding visitor method(s). The order is:
 102      * Call visitor methods of implemented interfaces first, then
 103      * call methods according to the class hierarchy in descending order,
 104      * i.e., the most specific visitXXX() call comes last.
 105      *
 106      * @param v Visitor object
 107      */
 108     @Override
 109     public void accept( final Visitor v ) {
 110         v.visitVariableLengthInstruction(this);
 111         v.visitStackConsumer(this);
 112         v.visitBranchInstruction(this);
 113         v.visitSelect(this);
 114         v.visitTABLESWITCH(this);
 115     }
 116 }