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1 /*
2 * SSHTools - Java SSH2 API
3 *
4 * Copyright (C) 2002-2003 Lee David Painter and Contributors.
5 *
6 * Contributions made by:
7 *
8 * Brett Smith
9 * Richard Pernavas
10 * Erwin Bolwidt
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
25 */
26 package com.sshtools.common.util;
27
28 import java.awt;
29
30
31 /**
32 * Other utilities not worth their own class
33 */
34 public final class GeneralUtil {
35 /**
36 * This method will replace '&' with "&", '"' with """, '<' with "<" and '>' with ">".
37 *
38 * @param html html to encode
39 * @return encoded html
40 */
41 public static String encodeHTML(String html) {
42 // Does java have a method of doing this?
43 StringBuffer buf = new StringBuffer();
44 char ch;
45
46 for (int i = 0; i < html.length(); i++) {
47 ch = html.charAt(i);
48
49 switch (ch) {
50 case '&':
51
52 // May be already encoded
53 if (((i + 5) < html.length()) &&
54 html.substring(i + 1, i + 5).equals("amp;")) {
55 buf.append(ch);
56 } else {
57 buf.append("&");
58 }
59
60 break;
61
62 case '"':
63 buf.append(""");
64
65 break;
66
67 case '<':
68 buf.append("<");
69
70 break;
71
72 case '>':
73 buf.append(">");
74
75 break;
76
77 default:
78 buf.append(ch);
79 }
80 }
81
82 return buf.toString();
83 }
84
85 /**
86 * Return a <code>Color</code> object given a string representation of it
87 *
88 * @param color
89 * @return string representation
90 * @throws IllegalArgumentException if string in bad format
91 */
92 public static Color stringToColor(String s) {
93 try {
94 return new Color(Integer.decode("0x" + s.substring(1, 3)).intValue(),
95 Integer.decode("0x" + s.substring(3, 5)).intValue(),
96 Integer.decode("0x" + s.substring(5, 7)).intValue());
97 } catch (Exception e) {
98 return null;
99 }
100 }
101
102 /**
103 * Return a string representation of a color
104 *
105 * @param color
106 * @return string representation
107 */
108 public static String colorToString(Color color) {
109 if (color == null) {
110 return "";
111 }
112
113 StringBuffer buf = new StringBuffer();
114 buf.append('#');
115 buf.append(numberToPaddedHexString(color.getRed(), 2));
116 buf.append(numberToPaddedHexString(color.getGreen(), 2));
117 buf.append(numberToPaddedHexString(color.getBlue(), 2));
118
119 return buf.toString();
120 }
121
122 /**
123 * Convert a number to a zero padded hex string
124 *
125 * @param int number
126 * @return zero padded hex string
127 * @throws IllegalArgumentException if number takes up more characters than
128 * <code>size</code>
129 */
130 public static String numberToPaddedHexString(int number, int size) {
131 String s = Integer.toHexString(number);
132
133 if (s.length() > size) {
134 throw new IllegalArgumentException(
135 "Number too big for padded hex string");
136 }
137
138 StringBuffer buf = new StringBuffer();
139
140 for (int i = 0; i < (size - s.length()); i++) {
141 buf.append('0');
142 }
143
144 buf.append(s);
145
146 return buf.toString();
147 }
148 }