1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.bcel.generic;
18
19 import java.io.DataOutputStream;
20 import java.io.IOException;
21
22 import org.apache.bcel.util.ByteSequence;
23
24 /**
25 * LOOKUPSWITCH - Switch with unordered set of values
26 *
27 * @see SWITCH
28 */
29 public class LOOKUPSWITCH extends Select {
30
31 /**
32 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
33 */
34 LOOKUPSWITCH() {
35 }
36
37 public LOOKUPSWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
38 super(org.apache.bcel.Const.LOOKUPSWITCH, match, targets, defaultTarget);
39 /* alignment remainder assumed 0 here, until dump time. */
40 final short length = (short) (9 + getMatchLength() * 8);
41 super.setLength(length);
42 setFixedLength(length);
43 }
44
45 /**
46 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
47 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
48 *
49 * @param v Visitor object
50 */
51 @Override
52 public void accept(final Visitor v) {
53 v.visitVariableLengthInstruction(this);
54 v.visitStackConsumer(this);
55 v.visitBranchInstruction(this);
56 v.visitSelect(this);
57 v.visitLOOKUPSWITCH(this);
58 }
59
60 /**
61 * Dump instruction as byte code to stream out.
62 *
63 * @param out Output stream
64 */
65 @Override
66 public void dump(final DataOutputStream out) throws IOException {
67 super.dump(out);
68 final int matchLength = getMatchLength();
69 out.writeInt(matchLength); // npairs
70 for (int i = 0; i < matchLength; i++) {
71 out.writeInt(super.getMatch(i)); // match-offset pairs
72 out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
73 }
74 }
75
76 /**
77 * Read needed data (e.g. index) from file.
78 */
79 @Override
80 protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
81 super.initFromFile(bytes, wide); // reads padding
82 final int matchLength = bytes.readInt();
83 setMatchLength(matchLength);
84 final short fixedLength = (short) (9 + matchLength * 8);
85 setFixedLength(fixedLength);
86 final short length = (short) (matchLength + super.getPadding());
87 super.setLength(length);
88 super.setMatches(new int[matchLength]);
89 super.setIndices(new int[matchLength]);
90 super.setTargets(new InstructionHandle[matchLength]);
91 for (int i = 0; i < matchLength; i++) {
92 super.setMatch(i, bytes.readInt());
93 super.setIndices(i, bytes.readInt());
94 }
95 }
96 }