1 package net.sf.cglib.transform.impl;
2
3 import java.lang.reflect.Constructor;
4 import net.sf.cglib.core.*;
5 import net.sf.cglib.transform.*;
6 import org.objectweb.asm.Attribute;
7 import org.objectweb.asm.Type;
8 import org.objectweb.asm.ClassVisitor;
9
10 public class UndeclaredThrowableTransformer extends ClassEmitterTransformer {
11 private Type wrapper;
12
13 public UndeclaredThrowableTransformer(Class wrapper) {
14 this.wrapper = Type.getType(wrapper);
15 boolean found = false;
16 Constructor[] cstructs = wrapper.getConstructors();
17 for (int i = 0; i < cstructs.length; i++) {
18 Class[] types = cstructs[i].getParameterTypes();
19 if (types.length == 1 && types[0].equals(Throwable.class)) {
20 found = true;
21 break;
22 }
23 }
24 if (!found)
25 throw new IllegalArgumentException(wrapper + " does not have a single-arg constructor that takes a Throwable");
26 }
27
28 public CodeEmitter begin_method(int access, final Signature sig, final Type[] exceptions, Attribute attrs) {
29 CodeEmitter e = super.begin_method(access, sig, exceptions, attrs);
30 if (TypeUtils.isAbstract(access) || sig.equals(Constants.SIG_STATIC)) {
31 return e;
32 }
33 return new CodeEmitter(e) {
34 private Block handler;
35 /* init */ {
36 handler = begin_block();
37 }
38 public void visitMaxs(int maxStack, int maxLocals) {
39 handler.end();
40 EmitUtils.wrap_undeclared_throwable(this, handler, exceptions, wrapper);
41 super.visitMaxs(maxStack, maxLocals);
42 }
43 };
44 }
45 }
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