1 package org.codehaus.mojo.exec;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.io.OutputStream;
23 import java.util.function.Consumer;
24
25 /**
26 * An output stream that captures one line of output at a time, and then
27 * redirects that line to some {@link Consumer} to act upon as it pleases. This
28 * class is not thread safe and expects to have only one active writer consuming
29 * it at any given time.
30 *
31 * @since 3.0.0
32 */
33 class LineRedirectOutputStream extends OutputStream {
34
35 private StringBuilder currentLine = new StringBuilder();
36 private final Consumer<String> linePrinter;
37
38 public LineRedirectOutputStream(Consumer<String> linePrinter) {
39 this.linePrinter = linePrinter;
40 }
41
42 @Override
43 public void write(final int b) {
44 if ((char) b == '\n') {
45 printAndReset();
46 return;
47 }
48 currentLine.append((char) b);
49 }
50
51 @Override
52 public void flush() {
53 if (currentLine.length() > 0) {
54 printAndReset();
55 }
56 }
57
58 private void printAndReset() {
59 linePrinter.accept(currentLine.toString());
60 currentLine = new StringBuilder();
61 }
62 }