1 /* 2 * Copyright (C) 2012 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 package com.android.test.runner.junit4; 17 18 import android.app.Instrumentation; 19 import android.os.Bundle; 20 21 import com.android.test.InjectContext; 22 import com.android.test.InjectInstrumentation; 23 24 import org.junit.runner.Runner; 25 import org.junit.runners.model.RunnerBuilder; 26 27 import java.lang.reflect.Field; 28 29 /** 30 * A {@link RunnerBuilder} that will build customized runners needed to handle {@link InjectContext} 31 * and {@link InjectInstrumentation}. 32 */ 33 public class AndroidJUnit4Builder extends RunnerBuilder { 34 35 private final Instrumentation mInstrumentation; 36 private final Bundle mBundle; 37 private boolean mSkipExecution; 38 AndroidJUnit4Builder(Instrumentation instr, Bundle bundle, boolean skipExecution)39 public AndroidJUnit4Builder(Instrumentation instr, Bundle bundle, boolean skipExecution) { 40 mInstrumentation = instr; 41 mBundle = bundle; 42 mSkipExecution = skipExecution; 43 } 44 45 @Override runnerForClass(Class<?> testClass)46 public Runner runnerForClass(Class<?> testClass) throws Throwable { 47 if (mSkipExecution) { 48 return new NonExecutingJUnit4ClassRunner(testClass); 49 } 50 if (hasInjectedFields(testClass)) { 51 return new AndroidJUnit4ClassRunner(testClass, mInstrumentation, mBundle); 52 } 53 return null; 54 } 55 hasInjectedFields(Class<?> testClass)56 private boolean hasInjectedFields(Class<?> testClass) { 57 // TODO: evaluate performance of this method, would be nice to utilize the annotation 58 // caching mechanism of ParentRunner 59 Class<?> superClass = testClass; 60 while (superClass != null) { 61 for (Field field : superClass.getDeclaredFields()) { 62 if (field.isAnnotationPresent(InjectInstrumentation.class)) { 63 return true; 64 } 65 if (field.isAnnotationPresent(InjectContext.class)) { 66 return true; 67 } 68 } 69 superClass = superClass.getSuperclass(); 70 } 71 return false; 72 } 73 74 } 75