/** * 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.zookeeper.common; import java.io.Closeable; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintStream; import org.slf4j.Logger; /* * This code is originally from HDFS, see the similarly named files there * in case of bug fixing, history, etc... */ public class IOUtils { /** * Closes the stream ignoring {@link IOException}. Must only be called in * cleaning up from exception handlers. * * @param stream * the Stream to close */ public static void closeStream(Closeable stream) { cleanup(null, stream); } /** * Close the Closeable objects and <b>ignore</b> any {@link IOException} or * null pointers. Must only be used for cleanup in exception handlers. * * @param log * the log to record problems to at debug level. Can be null. * @param closeables * the objects to close */ public static void cleanup(Logger log, Closeable... closeables) { for (Closeable c : closeables) { if (c != null) { try { c.close(); } catch (IOException e) { if (log != null) { log.warn("Exception in closing " + c, e); } } } } } /** * Copies from one stream to another. * * @param in * InputStrem to read from * @param out * OutputStream to write to * @param buffSize * the size of the buffer * @param close * whether or not close the InputStream and OutputStream at the * end. The streams are closed in the finally clause. */ public static void copyBytes(InputStream in, OutputStream out, int buffSize, boolean close) throws IOException { try { copyBytes(in, out, buffSize); if (close) { out.close(); out = null; in.close(); in = null; } } finally { if (close) { closeStream(out); closeStream(in); } } } /** * Copies from one stream to another. * * @param in * InputStrem to read from * @param out * OutputStream to write to * @param buffSize * the size of the buffer */ public static void copyBytes(InputStream in, OutputStream out, int buffSize) throws IOException { PrintStream ps = out instanceof PrintStream ? (PrintStream) out : null; byte buf[] = new byte[buffSize]; int bytesRead = in.read(buf); while (bytesRead >= 0) { out.write(buf, 0, bytesRead); if ((ps != null) && ps.checkError()) { throw new IOException("Unable to write to output stream."); } bytesRead = in.read(buf); } } }