LoggingOutputStream.java revision 3265:b7583d50f67d
1/* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.sjavac.server.log; 27 28import com.sun.tools.sjavac.Log; 29 30import java.io.ByteArrayOutputStream; 31import java.io.FilterOutputStream; 32import java.io.IOException; 33import java.io.OutputStream; 34 35public class LoggingOutputStream extends FilterOutputStream { 36 37 private static final byte[] LINE_SEP = System.lineSeparator().getBytes(); 38 39 private final Log.Level level; 40 private final String linePrefix; 41 private EolTrackingByteArrayOutputStream buf = new EolTrackingByteArrayOutputStream(); 42 43 public LoggingOutputStream(OutputStream out, Log.Level level, String linePrefix) { 44 super(out); 45 this.level = level; 46 this.linePrefix = linePrefix; 47 } 48 49 @Override 50 public void write(int b) throws IOException { 51 super.write(b); 52 buf.write(b); 53 if (buf.isLineComplete()) { 54 String line = new String(buf.toByteArray(), 0, buf.size() - LINE_SEP.length); 55 Log.log(level, linePrefix + line); 56 buf = new EolTrackingByteArrayOutputStream(); 57 } 58 } 59 60 private static class EolTrackingByteArrayOutputStream extends ByteArrayOutputStream { 61 private static final byte[] EOL = System.lineSeparator().getBytes(); 62 private boolean isLineComplete() { 63 if (count < EOL.length) { 64 return false; 65 } 66 for (int i = 0; i < EOL.length; i++) { 67 if (buf[count - EOL.length + i] != EOL[i]) { 68 return false; 69 } 70 } 71 return true; 72 } 73 } 74} 75