| // Copyright 2017 The Bazel Authors. All rights reserved. |
| // |
| // Licensed 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 com.google.devtools.build.android.desugar.runtime; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import java.lang.reflect.Method; |
| |
| /** |
| * A utility class for testing ThrowableExtension. It uses reflection to get the strategy name, so |
| * as to avoid dependency on the runtime library. This is beneficial, because we can test whether |
| * the runtime library is on the classpath. |
| */ |
| public class ThrowableExtensionTestUtility { |
| |
| private static final String SYSTEM_PROPERTY_EXPECTED_STRATEGY = "expected.strategy"; |
| |
| public static String getTwrStrategyClassNameSpecifiedInSystemProperty() { |
| String className = unquote(System.getProperty(SYSTEM_PROPERTY_EXPECTED_STRATEGY)); |
| assertThat(className).isNotEmpty(); |
| return className; |
| } |
| |
| private static final String THROWABLE_EXTENSION_CLASS_NAME = |
| "com.google.devtools.build.android.desugar.runtime.ThrowableExtension"; |
| |
| private static boolean isStrategyOfClass(String className) { |
| return getStrategyClassName().equals(className); |
| } |
| |
| public static String getStrategyClassName() { |
| try { |
| Class<?> klass = Class.forName(THROWABLE_EXTENSION_CLASS_NAME); |
| Method method = klass.getMethod("getStrategy"); |
| Object strategy = method.invoke(null); |
| return strategy.getClass().getName(); |
| } catch (Throwable e) { |
| throw new AssertionError(e); |
| } |
| } |
| |
| public static boolean isMimicStrategy() { |
| return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$MimicDesugaringStrategy"); |
| } |
| |
| public static boolean isNullStrategy() { |
| return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$NullDesugaringStrategy"); |
| } |
| |
| public static boolean isReuseStrategy() { |
| return isStrategyOfClass(THROWABLE_EXTENSION_CLASS_NAME + "$ReuseDesugaringStrategy"); |
| } |
| |
| private static String unquote(String s) { |
| if (s.startsWith("'") || s.startsWith("\"")) { |
| assertThat(s).endsWith(s.substring(0, 1)); |
| return s.substring(1, s.length() - 1); |
| } else { |
| return s; |
| } |
| } |
| } |