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.bytecode.ByteCode;
23 import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
24
25 /**
26 * This class is used for representations of cldc and cldc_w. In these cases, a narrow class ref has one byte and a wide class ref has two bytes.
27 */
28 public class NarrowClassRefForm extends ClassRefForm {
29
30 /**
31 * Constructs a new instance with the specified opcode, name, operandType and rewrite.
32 *
33 * @param opcode index corresponding to the opcode's value.
34 * @param name String printable name of the opcode.
35 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
36 */
37 public NarrowClassRefForm(final int opcode, final String name, final int[] rewrite) {
38 super(opcode, name, rewrite);
39 }
40
41 /**
42 * Constructs a new instance with the specified opcode, name, operandType and rewrite.
43 *
44 * @param opcode index corresponding to the opcode's value.
45 * @param name String printable name of the opcode.
46 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
47 * @param widened TODO.
48 */
49 public NarrowClassRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
50 super(opcode, name, rewrite, widened);
51 }
52
53 @Override
54 public boolean nestedMustStartClassPool() {
55 return !widened;
56 }
57
58 @Override
59 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
60 super.setNestedEntries(byteCode, operandManager, offset);
61 if (!widened) {
62 byteCode.setNestedPositions(new int[][] { { 0, 1 } });
63 }
64 }
65 }