1 /**
2 * Copyright (c) 2004-2011 QOS.ch
3 * All rights reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25 package org.slf4j.profiler;
26
27 public class SpacePadder {
28 public static final String LINE_SEP = System.getProperty("line.separator");
29
30 final static String[] SPACES = { " ", " ", " ", " ", // 1,2,4,8
31 // spaces
32 " ", // 16 spaces
33 " " }; // 32 spaces
34
35 final static public void leftPad(StringBuffer buf, String s, int desiredLength) {
36 int actualLen = 0;
37 if (s != null) {
38 actualLen = s.length();
39 }
40 if (actualLen < desiredLength) {
41 spacePad(buf, desiredLength - actualLen);
42 }
43 if (s != null) {
44 buf.append(s);
45 }
46 }
47
48 final static public void rightPad(StringBuffer buf, String s, int desiredLength) {
49 int actualLen = 0;
50 if (s != null) {
51 actualLen = s.length();
52 }
53 if (s != null) {
54 buf.append(s);
55 }
56 if (actualLen < desiredLength) {
57 spacePad(buf, desiredLength - actualLen);
58 }
59 }
60
61 /**
62 * Fast space padding method.
63 *
64 * @param sbuf the buffer to pad
65 * @param length the target size of the buffer after padding
66 */
67 final static public void spacePad(StringBuffer sbuf, int length) {
68 while (length >= 32) {
69 sbuf.append(SPACES[5]);
70 length -= 32;
71 }
72
73 for (int i = 4; i >= 0; i--) {
74 if ((length & (1 << i)) != 0) {
75 sbuf.append(SPACES[i]);
76 }
77 }
78 }
79 }