org.snapscript.cglib.transform.impl.UndeclaredThrowableStrategy 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
*
* http://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.snapscript.cglib.transform.impl;
import org.snapscript.cglib.core.ClassGenerator;
import org.snapscript.cglib.core.DefaultGeneratorStrategy;
import org.snapscript.cglib.core.GeneratorStrategy;
import org.snapscript.cglib.core.TypeUtils;
import org.snapscript.cglib.transform.ClassTransformer;
import org.snapscript.cglib.transform.MethodFilter;
import org.snapscript.cglib.transform.MethodFilterTransformer;
import org.snapscript.cglib.transform.TransformingClassGenerator;
/**
* A {@link GeneratorStrategy} suitable for use with {@link org.snapscript.cglib.Enhancer} which
* causes all undeclared exceptions thrown from within a proxied method to be wrapped
* in an alternative exception of your choice.
*/
public class UndeclaredThrowableStrategy extends DefaultGeneratorStrategy {
private Class wrapper;
/**
* Create a new instance of this strategy.
* @param wrapper a class which extends either directly or
* indirectly from Throwable and which has at least one
* constructor that takes a single argument of type
* Throwable, for example
* java.lang.reflect.UndeclaredThrowableException.class
*/
public UndeclaredThrowableStrategy(Class wrapper) {
this.wrapper = wrapper;
}
private static final MethodFilter TRANSFORM_FILTER = new MethodFilter() {
public boolean accept(int access, String name, String desc, String signature, String[] exceptions) {
return !TypeUtils.isPrivate(access) && name.indexOf('$') < 0;
}
};
protected ClassGenerator transform(ClassGenerator cg) throws Exception {
ClassTransformer tr = new UndeclaredThrowableTransformer(wrapper);
tr = new MethodFilterTransformer(TRANSFORM_FILTER, tr);
return new TransformingClassGenerator(cg, tr);
}
}