1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
18
19 import java.util.Objects;
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
29
30 public abstract class ReferenceForm extends ByteCodeForm {
31
32 public ReferenceForm(final int opcode, final String name, final int[] rewrite) {
33 super(opcode, name, rewrite);
34 }
35
36 protected abstract int getOffset(OperandManager operandManager);
37
38 protected abstract int getPoolID();
39
40
41
42
43
44
45
46
47 @Override
48 public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) {
49 final int offset = getOffset(operandManager);
50 try {
51 setNestedEntries(byteCode, operandManager, offset);
52 } catch (final Pack200Exception ex) {
53 throw new Error("Got a pack200 exception. What to do?");
54 }
55 }
56
57 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
58 final SegmentConstantPool globalPool = operandManager.globalConstantPool();
59 final ClassFileEntry[] nested = { globalPool.getConstantPoolEntry(getPoolID(), offset) };
60 Objects.requireNonNull(nested[0], "Null nested entries are not allowed");
61 byteCode.setNested(nested);
62 byteCode.setNestedPositions(new int[][] { { 0, 2 } });
63 }
64 }