001/**
002 * Copyright (C) 2006-2023 Talend Inc. - www.talend.com
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.talend.sdk.component.junit.delegate;
017
018import static java.util.Optional.ofNullable;
019import static lombok.AccessLevel.PROTECTED;
020
021import java.lang.reflect.InvocationTargetException;
022import java.util.Optional;
023
024import org.junit.runner.Description;
025import org.junit.runner.Runner;
026import org.junit.runner.notification.RunNotifier;
027import org.junit.runners.JUnit4;
028import org.junit.runners.model.InitializationError;
029
030import lombok.Getter;
031
032public class DelegatingRunner extends Runner {
033
034    private final Runner delegate;
035
036    @Getter(PROTECTED)
037    private final Class<?> testClass;
038
039    public DelegatingRunner(final Class<?> testClass) throws InitializationError {
040        this.testClass = testClass;
041        try {
042            final Optional<? extends Class<? extends Runner>> delegateClass =
043                    ofNullable(testClass.getAnnotation(DelegateRunWith.class)).map(DelegateRunWith::value);
044            this.delegate =
045                    delegateClass.isPresent() ? delegateClass.get().getConstructor(Class.class).newInstance(testClass)
046                            : new JUnit4(testClass);
047        } catch (final InstantiationException | NoSuchMethodException | IllegalAccessException e) {
048            throw new IllegalArgumentException(e);
049        } catch (final InvocationTargetException e) {
050            if (InitializationError.class.isInstance(e.getCause())) {
051                throw InitializationError.class.cast(e.getCause());
052            }
053            throw new IllegalStateException(e.getTargetException());
054        }
055    }
056
057    @Override
058    public Description getDescription() {
059        return delegate.getDescription();
060    }
061
062    @Override
063    public void run(final RunNotifier notifier) {
064        delegate.run(notifier);
065    }
066}