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PowerMock support module for JUnit 4.x.
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/*
 * Copyright 2008 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.modules.junit4;

import org.junit.runner.Description;
import org.junit.runner.notification.RunNotifier;
import org.powermock.modules.junit4.common.internal.PowerMockJUnitRunnerDelegate;
import org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner;
import org.powermock.modules.junit4.common.internal.impl.JUnitVersion;
import org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner;
import org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl;
import org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl;
import org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl;
import org.powermock.reflect.Whitebox;

import java.lang.annotation.Annotation;

public class PowerMockRunner extends AbstractCommonPowerMockRunner {

    public PowerMockRunner(Class klass) throws Exception {
        super(klass, getRunnerDelegateImplClass(klass));
    }
    
    private static Class getRunnerDelegateImplClass(Class klass) {
        if (klass.isAnnotationPresent(PowerMockRunnerDelegate.class)
                || Boolean.getBoolean("powermock.implicitDelegateAnnotation")) {
            return DelegatingPowerMockRunner.class;
        }

        Class concreteClass = PowerMockJUnit44RunnerDelegateImpl.class;
        if(JUnitVersion.isGreaterThanOrEqualTo("4.9")) {
                   concreteClass = PowerMockJUnit49RunnerDelegateImpl.class;
        } else if( JUnitVersion.isGreaterThanOrEqualTo("4.7") ) {
            concreteClass = PowerMockJUnit47RunnerDelegateImpl.class;
        }
        return concreteClass;
    }

    /**
     * Clean up some state to avoid OOM issues
     */
    @Override
    public void run(RunNotifier notifier) {
        Description description = getDescription();
        try {
            super.run(notifier);
        } finally {
            try {
               Whitebox.setInternalState(description, "fAnnotations", new Annotation[]{});
            } catch (RuntimeException err) {
               if (err.getCause() instanceof java.lang.NoSuchFieldException
                    && err.getCause().getMessage().equals("modifiers")) {
                // on JDK12 you cannot change 'modifiers'
               } else {
                  throw err;
               }
            }
        }
    }
}