| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.phoenix.util; |
| |
| import com.google.common.collect.Iterables; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.annotation.Nullable; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.LinkedList; |
| |
| |
| /** |
| * Utilities for operating on {@link Closeable}s. |
| * |
| */ |
| public class Closeables { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(Closeables.class); |
| |
| /** Not constructed */ |
| private Closeables() { } |
| |
| /** |
| * Close a {@code Closeable}, returning an {@code IOException} if it occurs while closing |
| * instead of throwing it. This is nearly a clone of the Guava Closeables.closeQuietly method |
| * which has long since been removed from Guava. |
| * |
| * Use of this method should be avoided -- quietly swallowing IOExceptions (particularly on |
| * Closeables that are being written to) is a code smell. Use of the equivalent method in |
| * Guava was done for this reason. |
| * |
| * @param closeable the Closeable to be closed, can be null |
| * @return the IOException if one was thrown, otherwise {@code null} |
| */ |
| public static IOException closeQuietly(@Nullable Closeable closeable) { |
| if (closeable == null) { |
| return null; |
| } |
| try { |
| closeable.close(); |
| return null; |
| } catch (IOException e) { |
| LOGGER.error("Error closing " + closeable, e); |
| return e; |
| } |
| } |
| |
| /** |
| * Allows you to close as many of the {@link Closeable}s as possible. |
| * |
| * If any of the close's fail with an IOException, those exception(s) will |
| * be thrown after attempting to close all of the inputs. |
| */ |
| public static void closeAll(Iterable<? extends Closeable> iterable) throws IOException { |
| IOException ex = closeAllQuietly(iterable); |
| if (ex != null) throw ex; |
| } |
| |
| public static IOException closeAllQuietly(Iterable<? extends Closeable> iterable) { |
| if (iterable == null) return null; |
| |
| LinkedList<IOException> exceptions = null; |
| for (Closeable closeable : iterable) { |
| IOException ioe = closeQuietly(closeable); |
| if (ioe != null) { |
| if (exceptions == null) exceptions = new LinkedList<IOException>(); |
| exceptions.add(ioe); |
| } |
| } |
| |
| IOException ex = MultipleCausesIOException.fromIOExceptions(exceptions); |
| return ex; |
| } |
| |
| static private class MultipleCausesIOException extends IOException { |
| private static final long serialVersionUID = 1L; |
| |
| static IOException fromIOExceptions(Collection<? extends IOException> exceptions) { |
| if (exceptions == null || exceptions.isEmpty()) return null; |
| if (exceptions.size() == 1) return Iterables.getOnlyElement(exceptions); |
| |
| return new MultipleCausesIOException(exceptions); |
| } |
| |
| private final Collection<? extends IOException> exceptions; |
| private boolean hasSetStackTrace; |
| |
| /** |
| * Use the {@link #fromIOExceptions(Collection) factory}. |
| */ |
| private MultipleCausesIOException(Collection<? extends IOException> exceptions) { |
| this.exceptions = exceptions; |
| } |
| |
| @Override |
| public String getMessage() { |
| StringBuilder sb = new StringBuilder(this.exceptions.size() * 50); |
| int exceptionNum = 0; |
| for (IOException ex : this.exceptions) { |
| sb.append("Cause Number " + exceptionNum + ": " + ex.getMessage() + "\n"); |
| exceptionNum++; |
| } |
| return sb.toString(); |
| } |
| |
| @Override |
| public StackTraceElement[] getStackTrace() { |
| if (!this.hasSetStackTrace) { |
| ArrayList<StackTraceElement> frames = new ArrayList<StackTraceElement>(this.exceptions.size() * 20); |
| |
| int exceptionNum = 0; |
| for (IOException exception : this.exceptions) { |
| StackTraceElement header = new StackTraceElement(MultipleCausesIOException.class.getName(), |
| "Exception Number " + exceptionNum, |
| "<no file>", |
| 0); |
| |
| frames.add(header); |
| for (StackTraceElement ste : exception.getStackTrace()) { |
| frames.add(ste); |
| } |
| exceptionNum++; |
| } |
| |
| setStackTrace(frames.toArray(new StackTraceElement[frames.size()])); |
| this.hasSetStackTrace = true; |
| } |
| |
| return super.getStackTrace(); |
| } |
| |
| } |
| |
| } |