1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
20
21 import org.apache.commons.compress.harmony.pack200.Pack200Exception;
22 import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
23 import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
24 import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
25 import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
26
27 /**
28 * This class implements the byte code form for those bytecodes which have string references (and only string references).
29 */
30 public class StringRefForm extends SingleByteReferenceForm {
31
32 /**
33 * Constructs a new instance with the specified opcode, name, operandType and rewrite.
34 *
35 * @param opcode index corresponding to the opcode's value.
36 * @param name String printable name of the opcode.
37 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
38 */
39 public StringRefForm(final int opcode, final String name, final int[] rewrite) {
40 super(opcode, name, rewrite);
41 }
42
43 /**
44 * Constructs a new instance with the specified opcode, name, operandType and rewrite.
45 *
46 * @param opcode index corresponding to the opcode's value.
47 * @param name String printable name of the opcode.
48 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
49 * @param widened TODO.
50 */
51 public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
52 this(opcode, name, rewrite);
53 this.widened = widened;
54 }
55
56 @Override
57 protected int getOffset(final OperandManager operandManager) {
58 return operandManager.nextStringRef();
59 }
60
61 @Override
62 protected int getPoolID() {
63 return SegmentConstantPool.CP_STRING;
64 }
65
66 @Override
67 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
68 final SegmentConstantPool globalPool = operandManager.globalConstantPool();
69 final ClassFileEntry[] nested = { globalPool.getValue(getPoolID(), offset) };
70 byteCode.setNested(nested);
71 if (widened) {
72 byteCode.setNestedPositions(new int[][] { { 0, 2 } });
73 } else {
74 byteCode.setNestedPositions(new int[][] { { 0, 1 } });
75 }
76 }
77 }