1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package ch.qos.logback.classic.util;
15
16 public class TestHelper {
17
18 static public Throwable makeNestedException(int level) {
19 if (level == 0) {
20 return new Exception("nesting level=" + level);
21 }
22 Throwable cause = makeNestedException(level - 1);
23 return new Exception("nesting level =" + level, cause);
24 }
25
26 /**
27 * Usage:
28 *
29 * <pre>
30 * String s = "123";
31 * positionOf("1").in(s) < positionOf("3").in(s)
32 * </pre>
33 *
34 * @param pattern Plain text to be found
35 * @return StringPosition fluent interface
36 */
37 public static StringPosition positionOf(String pattern) {
38 return new StringPosition(pattern);
39 }
40
41 public static class StringPosition {
42 private final String pattern;
43
44 public StringPosition(String pattern) {
45 this.pattern = pattern;
46 }
47
48 public int in(String s) {
49 final int position = s.indexOf(pattern);
50 if (position < 0)
51 throw new IllegalArgumentException("String '" + pattern + "' not found in: '" + s + "'");
52 return position;
53 }
54
55 }
56
57 }