1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one *
3 * or more contributor license agreements. See the NOTICE file *
4 * distributed with this work for additional information *
5 * regarding copyright ownership. The ASF licenses this file *
6 * to you under the Apache License, Version 2.0 (the *
7 * "License"); you may not use this file except in compliance *
8 * with the License. You may obtain a copy of the License at *
9 * *
10 * http://www.apache.org/licenses/LICENSE-2.0 *
11 * *
12 * Unless required by applicable law or agreed to in writing, *
13 * software distributed under the License is distributed on an *
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
15 * KIND, either express or implied. See the License for the *
16 * specific language governing permissions and limitations *
17 * under the License. *
18 */
19 package org.apache.rat.header;
20
21 import java.io.IOException;
22 import java.io.Reader;
23
24 /** Replacement for {@link java.io.LineNumberReader}. This class
25 * provides a workaround for an incompatibility in the
26 * {@link java.io.LineNumberReader}: If the last line in a file
27 * isn't terminated with LF, or CR, or CRLF, then that line
28 * is counted in Java 16, and beyond, but wasn't counted before.
29 * This implementation is compatible with the latter variant,
30 * thus providing upwards compatibility for RAT.
31 */
32 public class LineNumberReader {
33 private final Reader parent;
34 private boolean previousCharWasCR = false;
35 private int lineNumber = 0;
36
37 public LineNumberReader(Reader pReader) {
38 parent = pReader;
39 }
40
41 public int read() throws IOException {
42 final int c = parent.read();
43 switch(c) {
44 case 13:
45 previousCharWasCR = true;
46 ++lineNumber;
47 break;
48 case 10:
49 if (!previousCharWasCR) {
50 ++lineNumber;
51 }
52 previousCharWasCR = false;
53 break;
54 default:
55 previousCharWasCR = false;
56 break;
57 }
58 return c;
59 }
60
61 public int getLineNumber() {
62 return lineNumber;
63 }
64 }