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Surefire JUnit3 Runner
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.maven.surefire.junit;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import org.apache.maven.surefire.api.testset.TestSetFailedException;
import org.apache.maven.surefire.common.junit3.JUnit3Reflector;

/**
 * JUnit3 test set
 *
 */
public final class JUnitTestSetExecutor implements SurefireTestSetExecutor {
    private final JUnit3Reflector reflector;

    private final JUnit3Reporter reporter;

    public JUnitTestSetExecutor(JUnit3Reflector reflector, JUnit3Reporter reporter) {
        this.reflector = reflector;
        this.reporter = reporter;

        // ----------------------------------------------------------------------
        // Strategy for executing JUnit tests
        //
        // o look for the suite method and if that is present execute that method
        //   to get the test object.
        //
        // o look for test classes that are assignable from TestCase
        //
        // o look for test classes that only implement the Test interface
        // ----------------------------------------------------------------------

        // The interface implemented by the dynamic proxy (TestListener), happens to be
        // the same as the param types of TestResult.addTestListener
    }

    @Override
    public void execute(Class testClass, ClassLoader loader) throws TestSetFailedException {
        try {
            Object testObject = reflector.constructTestObject(testClass);
            final Method runMethod;

            if (reflector.getTestInterface().isAssignableFrom(testObject.getClass())) {
                runMethod = reflector.getTestInterfaceRunMethod();
            } else {
                runMethod = reflector.getRunMethod(testClass);
            }

            Object instanceOfTestResult = reflector.getTestResultClass().newInstance();

            TestListenerInvocationHandler invocationHandler = new TestListenerInvocationHandler(reporter);

            Object testListener = Proxy.newProxyInstance(
                    loader, reflector.getInterfacesImplementedByDynamicProxy(), invocationHandler);

            Object[] addTestListenerParams = {testListener};

            reflector.getAddListenerMethod().invoke(instanceOfTestResult, addTestListenerParams);

            Object[] runParams = {instanceOfTestResult};

            runMethod.invoke(testObject, runParams);
        } catch (InvocationTargetException e) {
            throw new TestSetFailedException(testClass.getName(), e.getTargetException());
        } catch (NoSuchMethodException e) {
            throw new TestSetFailedException("Class is not a JUnit TestCase", e);
        } catch (ReflectiveOperationException e) {
            throw new TestSetFailedException(testClass.getName(), e);
        }
    }
}