UndeclaredThrowableStrategy.java

/*
 *
 *   Copyright 2003 the original author or authors.
 *
 *   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.powermock.api.mockito.repackaged.cglib.transform.impl;

import org.powermock.api.mockito.repackaged.cglib.core.ClassGenerator;
import org.powermock.api.mockito.repackaged.cglib.core.DefaultGeneratorStrategy;
import org.powermock.api.mockito.repackaged.cglib.core.TypeUtils;
import org.powermock.api.mockito.repackaged.cglib.transform.ClassTransformer;
import org.powermock.api.mockito.repackaged.cglib.transform.MethodFilter;
import org.powermock.api.mockito.repackaged.cglib.transform.MethodFilterTransformer;
import org.powermock.api.mockito.repackaged.cglib.transform.TransformingClassGenerator;

/**
 * A {@link org.powermock.api.mockito.repackaged.cglib.core.GeneratorStrategy} suitable for use with {@link org.powermock.api.mockito.repackaged.cglib.proxy.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 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;
        }
    };
    private ClassTransformer t;
    
    /**
     * Create a new instance of this strategy.
     * @param wrapper a class which extends either directly or
     * indirectly from {@code Throwable} and which has at least one
     * constructor that takes a single argument of type
     * {@code Throwable}, for example
     * {@code java.lang.reflect.UndeclaredThrowableException.class}
     */
    public UndeclaredThrowableStrategy(Class wrapper) {
        t = new UndeclaredThrowableTransformer(wrapper);
        t = new MethodFilterTransformer(TRANSFORM_FILTER, t);
    }

    protected ClassGenerator transform(ClassGenerator cg) throws Exception {
        return new TransformingClassGenerator(cg, t);
    }
}