UndeclaredThrowableTransformer.java revision 674060f01e9090cd21b3c5656cc3204912ad17a6 
1/*
2 * Copyright 2003 The Apache Software Foundation
3 *
4 *  Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *  Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package org.mockito.cglib.transform.impl;
17
18import java.lang.reflect.Constructor;
19
20import org.mockito.asm.Attribute;
21import org.mockito.asm.ClassVisitor;
22import org.mockito.asm.Type;
23import org.mockito.cglib.core.*;
24import org.mockito.cglib.transform.*;
25
26public class UndeclaredThrowableTransformer extends ClassEmitterTransformer {
27    private Type wrapper;
28
29    public UndeclaredThrowableTransformer(Class wrapper) {
30        this.wrapper = Type.getType(wrapper);
31        boolean found = false;
32        Constructor[] cstructs = wrapper.getConstructors();
33        for (int i = 0; i < cstructs.length; i++) {
34            Class[] types = cstructs[i].getParameterTypes();
35            if (types.length == 1 && types[0].equals(Throwable.class)) {
36                found = true;
37                break;
38            }
39        }
40        if (!found)
41            throw new IllegalArgumentException(wrapper + " does not have a single-arg constructor that takes a Throwable");
42    }
43
44    public CodeEmitter begin_method(int access, final Signature sig, final Type[] exceptions) {
45        CodeEmitter e = super.begin_method(access, sig, exceptions);
46        if (TypeUtils.isAbstract(access) || sig.equals(Constants.SIG_STATIC)) {
47            return e;
48        }
49        return new CodeEmitter(e) {
50            private Block handler;
51            /* init */ {
52                handler = begin_block();
53            }
54            public void visitMaxs(int maxStack, int maxLocals) {
55                handler.end();
56                EmitUtils.wrap_undeclared_throwable(this, handler, exceptions, wrapper);
57                super.visitMaxs(maxStack, maxLocals);
58            }
59        };
60    }
61}
62