org.springframework.cglib.transform.impl.UndeclaredThrowableTransformer Maven / Gradle / Ivy
/*
* Copyright 2003 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cglib.transform.impl;
import java.lang.reflect.Constructor;
import org.springframework.asm.Type;
import org.springframework.cglib.core.Block;
import org.springframework.cglib.core.CodeEmitter;
import org.springframework.cglib.core.Constants;
import org.springframework.cglib.core.EmitUtils;
import org.springframework.cglib.core.Signature;
import org.springframework.cglib.core.TypeUtils;
import org.springframework.cglib.transform.ClassEmitterTransformer;
@SuppressWarnings({"rawtypes", "unchecked"})
public class UndeclaredThrowableTransformer extends ClassEmitterTransformer {
private final Type wrapper;
public UndeclaredThrowableTransformer(Class wrapper) {
this.wrapper = Type.getType(wrapper);
boolean found = false;
Constructor[] cstructs = wrapper.getConstructors();
for (int i = 0; i < cstructs.length; i++) {
Class[] types = cstructs[i].getParameterTypes();
if (types.length == 1 && types[0].equals(Throwable.class)) {
found = true;
break;
}
}
if (!found)
throw new IllegalArgumentException(wrapper + " does not have a single-arg constructor that takes a Throwable");
}
@Override
public CodeEmitter begin_method(int access, final Signature sig, final Type[] exceptions) {
CodeEmitter e = super.begin_method(access, sig, exceptions);
if (TypeUtils.isAbstract(access) || sig.equals(Constants.SIG_STATIC)) {
return e;
}
return new CodeEmitter(e) {
private Block handler;
/* init */ {
handler = begin_block();
}
@Override
public void visitMaxs(int maxStack, int maxLocals) {
handler.end();
EmitUtils.wrap_undeclared_throwable(this, handler, exceptions, wrapper);
super.visitMaxs(maxStack, maxLocals);
}
};
}
}