/*
* 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.tdb.store;
import org.apache.jena.atlas.lib.BitsLong ;
public class IntegerNode
{
// 56 bits of value, including sign bit.
public static int LEN = 56 ;
public static int LBITS = Long.SIZE ;
public static long MAX = (1L<< (LEN-1) )-1;
public static long MIN = -(1L<< (LEN-1) ) ;
public static long pack(long v)
{
if ( v >= MIN && v <= MAX )
{
v = BitsLong.clear(v, LEN, LBITS) ;
v = NodeId.setType(v, NodeId.INTEGER) ;
return v ;
}
else
return -1 ;
}
public static long unpack(long v)
{
long val = BitsLong.clear(v, LEN, LBITS) ;
// Sign extends to 64 bits.
if ( BitsLong.isSet(val, LEN-1) )
val = BitsLong.set(v, LEN, LBITS) ;
return val ;
}
}