| // 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()."); |
| } |
| } |
| |
| /** A resource inheriting the close() method from its parent. */ |
| public static class InheritanceResource extends SimpleResource {} |
| |
| /** 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); |
| } |
| } |
| |
| /** A simple resource type for testing try-with-resources with multiple resources. */ |
| public static class SimpleCloseable implements Closeable { |
| |
| /** This method tests a method with method reference as resources. */ |
| public void multipleTryWithResources() throws Exception { |
| try (Closeable resource1 = new SimpleResource(); |
| Closeable resource2 = this::close; |
| Closeable resource3 = new SimpleResource()) {} |
| } |
| |
| @Override |
| public void close() throws IOException { |
| throw new IOException("exception in close()."); |
| } |
| } |
| |
| public static void multipleTryWithResources() throws Exception { |
| SimpleCloseable resource = new SimpleCloseable(); |
| resource.multipleTryWithResources(); |
| } |
| |
| /** |
| * This method useds {@link InheritanceResource}, which inherits all methods from {@link |
| * SimpleResource}. |
| */ |
| public static void inheritanceTryWithResources() throws Exception { |
| // Throwable.addSuppressed(Throwable) should be called in the following block. |
| try (InheritanceResource resource = new InheritanceResource()) { |
| 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 ""; |
| } |
| } |