/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.shared.uuid;
import org.apache.jena.atlas.lib.BitsLong ;
/*
Version 1:
60 bits of time
48 bits of nodeId
12 bits of clock sequence
2 bits variant
4 bits version
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| time_low | 8 hex digits
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| time_mid | time_hi_and_version | 4-4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|clk_seq_hi_res | clk_seq_low | node (0-1) | 4-
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| node (2-5) | 12
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
// http://www.opengroup.org/onlinepubs/009629399/apdxa.htm
/* java.util.UUID
0xFFFFFFFF00000000 time_low
0x00000000FFFF0000 time_mid
0x000000000000F000 version
0x0000000000000FFF time_hi
The least significant long consists of the following unsigned fields:
0xC000000000000000 variant
0x3FFF000000000000 clock_seq
0x0000FFFFFFFFFFFF node
*/
/** Timebased UUIDs. */
public class UUID_V1 extends JenaUUID
{
// Constants
public static final int version = 1 ; // Version 1: time-based.
public static final int variant = JenaUUID.Var_Std ; // DCE varient
// The only state-per-object
long bitsMostSignificant ;
long bitsLeastSignificant ;
UUID_V1(long mostSigBits, long leastSigBits)
{
if ( ! check(mostSigBits, leastSigBits) )
{
check(mostSigBits, leastSigBits) ;
throw new IllegalArgumentException("Funny bits") ;
}
bitsMostSignificant = mostSigBits ;
bitsLeastSignificant = leastSigBits;
}
@Override
public long getMostSignificantBits() { return bitsMostSignificant ; }
@Override
public long getLeastSignificantBits() { return bitsLeastSignificant ; }
private boolean check(long mostSigBits, long leastSigBits)
{
int _variant = _getVariant(mostSigBits, leastSigBits) ;
int _version = _getVersion(mostSigBits, leastSigBits) ;
if ( _variant != variant) return false ;
if ( _version != version) return false ;
return true ;
}
// Accessors
long getTimeHigh() { return BitsLong.unpack(bitsMostSignificant, 0, 12) ; } // ( uuid.bitsUpper & UUID_V1_Gen.maskTimeHigh ) ;
long getTimeMid() { return BitsLong.unpack(bitsMostSignificant, 16, 32) ; } // ( uuid.bitsUpper & UUID_V1_Gen.maskTimeMid ) >>> 16 ;
long getTimeLow() { return BitsLong.unpack(bitsMostSignificant, 32, 64) ; } // ( uuid.bitsUpper & UUID_V1_Gen.maskTimeLow ) >>> 32;
public long getTimestamp()
{
return getTimeLow() | getTimeMid()<<32 | getTimeHigh()<<48 ;
}
public long getClockSequence()
{
return BitsLong.unpack(bitsLeastSignificant, 48, 62) ;
}
public long getNode() { return BitsLong.unpack(bitsLeastSignificant, 0, 48) ; }
@Override
public int getVersion() { return super._getVersion(bitsMostSignificant, bitsLeastSignificant) ; }
@Override
public int getVariant() { return super._getVariant(bitsMostSignificant, bitsLeastSignificant) ; }
}