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// 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;
}
}
}
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