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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.testdata;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
/**
* This is a test subject for {@link
* com.google.devtools.build.android.desugar.TryWithResourcesRewriter}
*/
public class ClassUsingTryWithResources {
/**
* A simple resource, which always throws an exception when being closed.
*
* <p>Note that we need to implement java.io.Closeable instead of java.lang.AutoCloseable, because
* AutoCloseable is not available below API 19
*
* <p>java9 will emit $closeResource(Throwable, AutoCloseable) for the following class.
*/
public static class SimpleResource implements Closeable {
public void call(boolean throwException) {
if (throwException) {
throw new RuntimeException("exception in call()");
}
}
@Override
public void close() throws IOException {
throw new IOException("exception in close().");
}
}
/** This method will always throw {@link java.lang.Exception}. */
public static void simpleTryWithResources() throws Exception {
// Throwable.addSuppressed(Throwable) should be called in the following block.
try (SimpleResource resource = new SimpleResource()) {
resource.call(true);
}
}
public static Throwable[] checkSuppressedExceptions(boolean throwException) {
// Throwable.addSuppressed(Throwable) should be called in the following block.
try (SimpleResource resource = new SimpleResource()) {
resource.call(throwException);
} catch (Exception e) {
return e.getSuppressed(); // getSuppressed() is called.
}
return new Throwable[0];
}
public static String printStackTraceOfCaughtException() {
try {
simpleTryWithResources();
} catch (Exception e) {
PrintStream err = System.err;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
try {
System.setErr(new PrintStream(stream, true, "utf-8"));
e.printStackTrace();
} catch (UnsupportedEncodingException e1) {
throw new AssertionError(e1);
} finally {
System.setErr(err);
}
return new String(stream.toByteArray(), UTF_8);
}
return "";
}
}
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