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Java > Open Source Codes > org > alfresco > util > GUID


1 /*
2  * Copyright (C) 2005 Alfresco, Inc.
3  *
4  * Licensed under the Mozilla Public License version 1.1
5  * with a permitted attribution clause. You may obtain a
6  * copy of the License at
7  *
8  * http://www.alfresco.org/legal/license.txt
9  *
10  * Unless required by applicable law or agreed to in writing,
11  * software distributed under the License is distributed on an
12  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13  * either express or implied. See the License for the specific
14  * language governing permissions and limitations under the
15  * License.
16  */
17 package org.alfresco.util;
18
19 import org.doomdark.uuid.UUIDGenerator;
20
21 /**
22  * A wrapper class to serve up GUIDs
23  *
24  * @author kevinr
25  */
26 public final class GUID
27 {
28    /**
29     * Private Constructor for GUID.
30     */
31    private GUID()
32    {
33    }
34
35 // protected static final char[] s_values =
36 // {
37 // '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
38 // 'f'
39 // };
40
41    /**
42     * Generates and returns a new GUID as a string
43     *
44     * @return String GUID
45     */
46    public static String JavaDoc generate()
47    {
48       return UUIDGenerator.getInstance().generateTimeBasedUUID().toString();
49    }
50
51 // == Not sure if we need this functionality again (derekh) ==
52 //
53 // /**
54 // * Convert a string with a guid inside into a byte[16] array
55 // *
56 // * @param str - the guid
57 // * @return - byte[16] containing the GUID
58 // * @throws InvalidGuidFormatException
59 // */
60 // public static byte[] parseFromString(String str) throws InvalidGuidFormatException
61 // {
62 // byte[] data = new byte[16];
63 // int dataPos = 0;
64 //
65 // byte bVal;
66 // int value = 0;
67 // int pos = 0;
68 //
69 // for(int i = 0; i < str.length(); i++)
70 // {
71 // char thisChar = str.charAt(i);
72 //
73 // int idx = 0;
74 //
75 // if(thisChar >= '0' && thisChar <= '9')
76 // {
77 // idx = thisChar - '0';
78 // pos++;
79 // }
80 // else if(thisChar >= 'a' && thisChar <= 'f')
81 // {
82 // idx = thisChar - 'a' + 10;
83 // pos++;
84 // }
85 // else if(thisChar >= 'a' && thisChar <= 'f')
86 // {
87 // idx = thisChar - 'A' + 10;
88 // pos++;
89 // }
90 // else if(thisChar == '-' || thisChar == '{' || thisChar == '}')
91 // {
92 // // Doesn't matter
93 // }
94 // else
95 // {
96 // throw new InvalidGuidFormatException();
97 // }
98 //
99 // try
100 // {
101 // if(pos == 1)
102 // value = idx;
103 // else if(pos == 2)
104 // {
105 // value = (value * 16) + idx;
106 //
107 // byte b = (byte) value;
108 // data[dataPos++] = b;
109 //
110 // pos = 0;
111 // }
112 // }
113 // catch(RuntimeException e)
114 // {
115 // // May occur if we go off the end of the data index
116 // throw new InvalidGuidFormatException();
117 // }
118 // }
119 //
120 // return data;
121 // }
122 //
123 // /**
124 // * Convert a byte[16] containing a guid to a string representation
125 // *
126 // * @param data - the data
127 // * @return - the string
128 // */
129 // public static String convertToString(byte[] data)
130 // {
131 // char[] output = new char[36];
132 // int cPos = 0;
133 //
134 // for(int i = 0; i < 16; i++)
135 // {
136 // int v = data[i];
137 //
138 // int lowVal = v & 0x000F;
139 // int hiVal = (v & 0x00F0) >> 4;
140 //
141 // output[cPos++] = s_values[hiVal];
142 // output[cPos++] = s_values[lowVal];
143 //
144 // if(cPos == 8 || cPos == 13 || cPos == 18 || cPos == 23)
145 // output[cPos++] = '-';
146 // }
147 //
148 // return new String(output);
149 // }
150 }
151
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