1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package vogar.target.junit;
18
19import com.google.common.base.Function;
20import org.junit.internal.builders.AnnotatedBuilder;
21import org.junit.runner.RunWith;
22import org.junit.runner.Runner;
23import org.junit.runners.model.RunnerBuilder;
24
25/**
26 * An {@link AnnotatedBuilder} that can map the {@link Runner} class specified in the
27 * {@link RunWith} annotation to a replacement one.
28 */
29public class MappingAnnotatedBuilder extends AnnotatedBuilder {
30
31    private final Function<Class<? extends Runner>, Class<? extends Runner>> mappingFunction;
32
33    public MappingAnnotatedBuilder(
34            RunnerBuilder suiteBuilder,
35            Function<Class<? extends Runner>, Class<? extends Runner>> mappingFunction) {
36        super(suiteBuilder);
37        this.mappingFunction = mappingFunction;
38    }
39
40    @Override
41    public Runner runnerForClass(Class<?> testClass) throws Exception {
42        RunWith runWith = testClass.getAnnotation(RunWith.class);
43        if (runWith != null) {
44            Class<? extends Runner> runnerClass = runWith.value();
45
46            runnerClass = mappingFunction.apply(runnerClass);
47            if (runnerClass != null) {
48                return buildRunner(runnerClass, testClass);
49            }
50        }
51
52        return null;
53    }
54}
55