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Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine.
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/*
* (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* [See end of file]
*/
package com.hp.hpl.jena.shared.uuid;
import java.util.* ;
import com.hp.hpl.jena.shared.uuid.JenaUUID.FormatException;
/** Generator for for random number based UUIDs (version 2, variant 4)
* @author Andy Seaborne
* @version $Id: UUID_V4_Gen.java,v 1.1 2009/06/29 08:55:40 castagna Exp $
*/
public class UUID_V4_Gen implements UUIDFactory
{
// Implementation should be compatible with JXTA UUIDs
static final int versionHere = 4 ; // Version 4: random number
static final int variantHere = JenaUUID.Var_Std ;
Random random = null ;
public UUID_V4_Gen() {}
public JenaUUID generate()
{ return generateV4() ; }
public UUID_V4 generateV4()
{
init() ;
long mostSigBits = random.nextLong() ;
long leastSigBits = random.nextLong() ;
mostSigBits = Bits.pack(mostSigBits, versionHere, 12, 16) ;
leastSigBits = Bits.pack(leastSigBits, variantHere, 62, 64) ;
return new UUID_V4(mostSigBits, leastSigBits) ;
}
public JenaUUID parse(String s)
{ return parseV4(s) ; }
public UUID_V4 parseV4(String s)
{
s = s.toLowerCase() ;
if ( s.length() != 36 )
throw new FormatException("UUID string is not 36 chars long: it's "+s.length()+" ["+s+"]") ;
if ( s.charAt(8) != '-' && s.charAt(13) != '-' && s.charAt(18) != '-' && s.charAt(23) != '-' )
throw new FormatException("String does not have dashes in the right places: "+s) ;
UUID_V4 u = parse$(s) ;
if ( u.getVersion() != versionHere )
throw new FormatException("Wrong version (Expected: "+versionHere+"Got: "+u.getVersion()+"): "+s) ;
if ( u.getVariant() != variantHere )
throw new FormatException("Wrong version (Expected: "+variantHere+"Got: "+u.getVariant()+"): "+s) ;
return u ;
}
static UUID_V4 parse$(String s)
{
// The UUID broken up into parts.
// 00000000-0000-0000-0000-000000000000
// ^ ^ ^ ^ ^
// Byte: 0 4 6 8 10
// Char: 0 9 14 19 24 including hyphens
long mostSigBits = Bits.unpack(s, 0, 8) ;
// Skip -
mostSigBits = mostSigBits << 16 | Bits.unpack(s, 9, 13) ;
// Skip -
mostSigBits = mostSigBits << 16 | Bits.unpack(s, 14, 18) ;
long leastSigBits = Bits.unpack(s, 19, 23) ;
leastSigBits = leastSigBits<<48 | Bits.unpack(s, 24, 36) ;
return new UUID_V4(mostSigBits, leastSigBits) ;
}
public static String unparse(UUID_V4 uuid)
{
StringBuffer sb = new StringBuffer(36) ;
JenaUUID.toHex(sb, Bits.unpack(uuid.bitsMostSignificant, 32, 64), 4) ;
sb.append('-') ;
JenaUUID.toHex(sb, Bits.unpack(uuid.bitsMostSignificant, 16, 32), 2) ;
sb.append('-') ;
JenaUUID.toHex(sb, Bits.unpack(uuid.bitsMostSignificant, 0, 16), 2) ;
sb.append('-') ;
JenaUUID.toHex(sb, Bits.unpack(uuid.bitsLeastSignificant, 48, 64), 2) ;
sb.append('-') ;
JenaUUID.toHex(sb, Bits.unpack(uuid.bitsLeastSignificant, 0, 48), 6) ;
return sb.toString() ;
}
private void init()
{
if ( random == null )
reset() ;
}
public void reset()
{
random = LibUUID.makeRandom() ;
}
}
/*
* (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/