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Java > Open Source Codes > com > tc > object > bytecode > JavaUtilConcurrentLinkedBlockingQueueNodeClassAdapter


1 /*
2  * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice. All rights reserved.
3  */
4 package com.tc.object.bytecode;
5 import com.tc.asm.ClassAdapter;
6 import com.tc.asm.ClassVisitor;
7 import com.tc.asm.Label;
8 import com.tc.asm.MethodVisitor;
9 import com.tc.asm.Opcodes;
10
11 public class JavaUtilConcurrentLinkedBlockingQueueNodeClassAdapter extends ClassAdapter implements Opcodes {
12
13   public JavaUtilConcurrentLinkedBlockingQueueNodeClassAdapter(ClassVisitor cv) {
14     super(cv);
15   }
16
17   public void visitEnd() {
18     addGetItemMethod();
19     super.visitEnd();
20   }
21   
22   private void addGetItemMethod() {
23     MethodVisitor mv = cv.visitMethod(0, "getItem", "()Ljava/lang/Object;", "()TE;", null);
24     mv.visitCode();
25     Label l0 = new Label();
26     mv.visitLabel(l0);
27     mv.visitLineNumber(64, l0);
28     mv.visitVarInsn(ALOAD, 0);
29     mv.visitFieldInsn(GETFIELD, "java/util/concurrent/LinkedBlockingQueue$Node", "item", "Ljava/lang/Object;");
30     mv.visitTypeInsn(INSTANCEOF, "com/tc/object/ObjectID");
31     Label l1 = new Label();
32     mv.visitJumpInsn(IFEQ, l1);
33     Label l2 = new Label();
34     mv.visitLabel(l2);
35     mv.visitLineNumber(65, l2);
36     mv.visitVarInsn(ALOAD, 0);
37     mv.visitVarInsn(ALOAD, 0);
38     mv.visitFieldInsn(GETFIELD, "java/util/concurrent/LinkedBlockingQueue$Node", "item", "Ljava/lang/Object;");
39     mv.visitTypeInsn(CHECKCAST, "com/tc/object/ObjectID");
40     mv.visitMethodInsn(INVOKESTATIC, "com/tc/object/bytecode/ManagerUtil", "lookupObject", "(Lcom/tc/object/ObjectID;)Ljava/lang/Object;");
41     mv.visitFieldInsn(PUTFIELD, "java/util/concurrent/LinkedBlockingQueue$Node", "item", "Ljava/lang/Object;");
42     mv.visitLabel(l1);
43     mv.visitLineNumber(67, l1);
44     mv.visitVarInsn(ALOAD, 0);
45     mv.visitFieldInsn(GETFIELD, "java/util/concurrent/LinkedBlockingQueue$Node", "item", "Ljava/lang/Object;");
46     mv.visitInsn(ARETURN);
47     Label l3 = new Label();
48     mv.visitLabel(l3);
49     mv.visitLocalVariable("this", "Ljava/util/concurrent/LinkedBlockingQueue$Node;", "Ljava/util/concurrent/LinkedBlockingQueue<TE;>.Node<TE;>;", l0, l3, 0);
50     mv.visitMaxs(2, 1);
51     mv.visitEnd();
52   }
53 }
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