Source Code Cross Referenced for JenaUUID.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » shared » uuid » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.shared.uuid 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
003:         * [See end of file]
004:         */
005:
006:        /** A class to create and recreate UUIDs.
007:         * @author   Andy Seaborne
008:         * @version  $Id: JenaUUID.java,v 1.3 2008/01/02 12:06:07 andy_seaborne Exp $
009:         * http://www.opengroup.org/onlinepubs/009629399/apdxa.htm
010:         */package com.hp.hpl.jena.shared.uuid;
011:
012:        import org.apache.commons.logging.Log;
013:        import org.apache.commons.logging.LogFactory;
014:
015:        // TODO
016:        // + Comments and renaming.
017:        // ? Move to/from string code here (string <=> pair of longs).
018:        //   OK but unparse code makes explicit what goes where in the structures
019:        //   parse/unparseV4 is the generic code.
020:
021:        // UUID and factory
022:
023:        public abstract class JenaUUID {
024:            static final int HEX = 16;
025:            static final int Var_NCS = 0;
026:            static final int Var_Std = 2; // Same as DCE
027:            static final int Var_DCE = 2;
028:            static final int Var_MS_GUID = 6;
029:            static final int Var_Reserved = 7;
030:
031:            abstract public int getVersion();
032:
033:            abstract public int getVariant();
034:
035:            abstract public long getMostSignificantBits();
036:
037:            abstract public long getLeastSignificantBits();
038:
039:            protected int _getVersion(long mostSigBits, long leastSigBits) {
040:                //        int variant = (int)((UUID_V1_Gen.maskVariant & leastSigBits)>>>62) ;
041:                //        int version = (int)((UUID_V1_Gen.maskVersion & mostSigBits)>>>12) ;
042:                int version = (int) Bits.unpack(mostSigBits, 12, 16);
043:                return version;
044:            }
045:
046:            protected int _getVariant(long mostSigBits, long leastSigBits) {
047:                int variant = (int) Bits.unpack(leastSigBits, 62, 64);
048:                return variant;
049:            }
050:
051:            protected JenaUUID() {
052:            }
053:
054:            /** Format as a string - no URI scheme **/
055:            public String asString() {
056:                return toString();
057:            }
058:
059:            /** Format as a URI - that is uuid:ABCD */
060:            public String asURI() {
061:                return "uuid:" + toString();
062:            }
063:
064:            /** Format as a URN - that is urn:uuid:ABCD */
065:            public String asURN() {
066:                return "urn:uuid:" + toString();
067:            }
068:
069:            // ----------------------------------------------------		
070:            // Factory
071:
072:            static UUIDFactory factory = new UUID_V1_Gen();
073:
074:            public static void setFactory(UUIDFactory factory) {
075:                JenaUUID.factory = factory;
076:            }
077:
078:            public static UUIDFactory getFactory() {
079:                return factory;
080:            }
081:
082:            /** Create a UUID */
083:            public static JenaUUID generate() {
084:                return factory.generate();
085:            }
086:
087:            public static void reset() {
088:                factory.reset();
089:            }
090:
091:            /** The nil UUID */
092:            public static JenaUUID nil() {
093:                return UUID_nil.getNil();
094:            }
095:
096:            public static String strNil() {
097:                return UUID_nil.getNilString();
098:            }
099:
100:            public boolean isNil() {
101:                return this .equals(nil());
102:            } // Or this == UUID_nil.nil because it's a singleton.
103:
104:            /** Recreate a UUID from string*/
105:            public static JenaUUID parse(String s) {
106:                if (s.equals(strNil()))
107:                    return nil();
108:
109:                // Canonical: this works in conjunction with .equals
110:                s = s.toLowerCase();
111:
112:                if (s.startsWith("urn:"))
113:                    s = s.substring(4);
114:                if (s.startsWith("uuid:"))
115:                    s = s.substring(5);
116:
117:                if (s.length() != 36)
118:                    throw new FormatException(
119:                            "UUID string is not 36 chars long: it's "
120:                                    + s.length() + " [" + s + "]");
121:
122:                if (s.charAt(8) != '-' || s.charAt(13) != '-'
123:                        || s.charAt(18) != '-' || s.charAt(23) != '-')
124:                    throw new FormatException(
125:                            "String does not have dashes in the right places: "
126:                                    + s);
127:
128:                //       00000000-0000-0000-0000-000000000000
129:                //       ^        ^    ^    ^    ^           
130:                // Byte: 0        4    6    8    10
131:                // Char: 0        9    14   19   24  including hyphens
132:
133:                int x = (int) Bits.unpack(s, 19, 23);
134:                int variant = (int) (x >>> 14);
135:                int version = (int) Bits.unpack(s, 14, 15);
136:
137:                if (variant == Var_Std) {
138:                    switch (version) {
139:                    case UUID_V1.version:
140:                        return UUID_V1_Gen.parse$(s);
141:                    case UUID_V4.version:
142:                        return UUID_V4_Gen.parse$(s);
143:                    }
144:                    LogFactory.getLog(JenaUUID.class).warn(
145:                            s + " : Unsupported version: " + version);
146:                    throw new UnsupportedOperationException(
147:                            "String specifies unsupported UUID version: "
148:                                    + version);
149:                }
150:
151:                Log log = LogFactory.getLog(JenaUUID.class);
152:
153:                switch (variant) {
154:                case Var_NCS: // NCS
155:                    log.warn(s
156:                            + " : Oh look! An NCS UUID ID.  Call the museum.");
157:                    break;
158:                case Var_DCE: // DCE - should have been caught earlier.
159:                    log
160:                            .warn(s
161:                                    + " : Oh look! A DCE UUID ID - but we shodul have already handled this");
162:                    break;
163:                case Var_MS_GUID:
164:                    log.warn(s + " : Microsoft UUID ID.");
165:                    break;
166:                case Var_Reserved:
167:                    log.warn(s + " : Reserved variant");
168:                    break;
169:                default:
170:                    log.warn(s + " : Unknown variant: " + variant);
171:                    break;
172:                }
173:                throw new UnsupportedOperationException(
174:                        "String specifies unsupported UUID variant: " + variant);
175:            }
176:
177:            // ----------------------------------------------------
178:            // Worker functions
179:
180:            static void toHex(StringBuffer sBuff, long value, int lenBytes) {
181:                // Insert in high-low order, by nibble
182:                for (int i = 2 * lenBytes - 1; i >= 0; i--) {
183:                    int shift = 4 * i;
184:                    int x = (int) (value >>> shift & 0xF);
185:                    sBuff.append(Character.forDigit(x, 16));
186:                }
187:            }
188:
189:            static public class FormatException extends RuntimeException {
190:                public FormatException() {
191:                    super ();
192:                }
193:
194:                public FormatException(String msg) {
195:                    super (msg);
196:                }
197:            }
198:
199:        }
200:
201:        /*
202:         *  (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
203:         *  All rights reserved.
204:         *
205:         * Redistribution and use in source and binary forms, with or without
206:         * modification, are permitted provided that the following conditions
207:         * are met:
208:         * 1. Redistributions of source code must retain the above copyright
209:         *    notice, this list of conditions and the following disclaimer.
210:         * 2. Redistributions in binary form must reproduce the above copyright
211:         *    notice, this list of conditions and the following disclaimer in the
212:         *    documentation and/or other materials provided with the distribution.
213:         * 3. The name of the author may not be used to endorse or promote products
214:         *    derived from this software without specific prior written permission.
215:         *
216:         * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
217:         * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
218:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
219:         * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
220:         * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
221:         * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
222:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
223:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
224:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
225:         * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
226:         */
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