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