1 /*
2 * Copyright 2009 Red Hat, Inc.
3 *
4 * Red Hat licenses this file to you under the Apache License, version 2.0
5 * (the "License"); you may not use this file except in compliance with the
6 * License. You may obtain a copy of the License at:
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package org.jboss.netty.util.internal;
17
18 import java.util.ArrayList;
19 import java.util.List;
20
21 /**
22 * Conversion utility class to parse a property represented as a string or
23 * an object.
24 *
25 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
26 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
27 *
28 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
29 *
30 */
31 public class ConversionUtil {
32
33 /**
34 * Converts the specified object into an integer.
35 */
36 public static int toInt(Object value) {
37 if (value instanceof Number) {
38 return ((Number) value).intValue();
39 } else {
40 return Integer.parseInt(String.valueOf(value));
41 }
42 }
43
44 /**
45 * Converts the specified object into a boolean.
46 */
47 public static boolean toBoolean(Object value) {
48 if (value instanceof Boolean) {
49 return ((Boolean) value).booleanValue();
50 }
51 if (value instanceof Number) {
52 return ((Number) value).intValue() != 0;
53 } else {
54 String s = String.valueOf(value);
55 if (s.length() == 0) {
56 return false;
57 }
58
59 try {
60 return Integer.parseInt(s) != 0;
61 } catch (NumberFormatException e) {
62 // Proceed
63 }
64
65 switch (Character.toUpperCase(s.charAt(0))) {
66 case 'T': case 'Y':
67 return true;
68 }
69 return false;
70 }
71 }
72
73 /**
74 * Converts the specified object into an array of strings.
75 */
76 public static String[] toStringArray(Object value) {
77 if (value instanceof String[]) {
78 return (String[]) value;
79 }
80
81 if (value instanceof Iterable<?>) {
82 List<String> answer = new ArrayList<String>();
83 for (Object v: (Iterable<?>) value) {
84 if (v == null) {
85 answer.add(null);
86 } else {
87 answer.add(String.valueOf(v));
88 }
89 }
90 return answer.toArray(new String[answer.size()]);
91 }
92
93 return String.valueOf(value).split("[, \\t\\n\\r\\f\\e\\a]");
94 }
95
96 private static final String[] INTEGERS = {
97 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
98 "10","11","12","13","14","15",
99 };
100
101 public static String toString(int value) {
102 if (value >= 0 && value < INTEGERS.length) {
103 return INTEGERS[value];
104 } else {
105 return Integer.toString(value);
106 }
107 }
108
109 private ConversionUtil() {
110 // Unused
111 }
112 }