1 // Copyright 2017 The Bazel Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 package com.google.devtools.build.android.desugar.runtime; 15 16 import static com.google.common.truth.Truth.assertThat; 17 18 import java.lang.reflect.Method; 19 20 /** 21 * A utility class for testing ThrowableExtension. It uses reflection to get the strategy name, so 22 * as to avoid dependency on the runtime library. This is beneficial, because we can test whether 23 * the runtime library is on the classpath. 24 */ 25 public class ThrowableExtensionTestUtility { 26 27 private static final String SYSTEM_PROPERTY_EXPECTED_STRATEGY = "expected.strategy"; 28 29 public static String getTwrStrategyClassNameSpecifiedInSystemProperty() { 30 String className = System.getProperty(SYSTEM_PROPERTY_EXPECTED_STRATEGY); 31 assertThat(className).isNotEmpty(); 32 return className; 33 } 34 35 private static final String THROWABLE_EXTENSION_CLASS_NAME = 36 "com.google.devtools.build.android.desugar.runtime.ThrowableExtension"; 37 38 private static boolean isStrategyOfClass(String className) { 39 return getStrategyClassName().equals(className); 40 } 41 42 public static String getStrategyClassName() { 43 try { 44 Class<?> klass = Class.forName(THROWABLE_EXTENSION_CLASS_NAME); 45 Method method = klass.getMethod("getStrategy"); 46 Object strategy = method.invoke(null); 47 return strategy.getClass().getName(); 48 } catch (Throwable e) { 49 throw new AssertionError(e); 50 } 51 } 52 53 public static boolean isMimicStrategy() { 54 return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$MimicDesugaringStrategy"); 55 } 56 57 public static boolean isNullStrategy() { 58 return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$NullDesugaringStrategy"); 59 } 60 61 public static boolean isReuseStrategy() { 62 return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$ReuseDesugaringStrategy"); 63 } 64 } 65
