/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.rdf.internal;
import java.math.BigInteger;
import org.apache.log4j.Logger;
import com.bigdata.rdf.internal.impl.literal.AbstractLiteralIV;
import com.bigdata.rdf.internal.impl.literal.XSDIntegerIV;
import com.bigdata.rdf.internal.impl.literal.XSDUnsignedByteIV;
import com.bigdata.rdf.internal.impl.literal.XSDUnsignedIntIV;
import com.bigdata.rdf.internal.impl.literal.XSDUnsignedLongIV;
import com.bigdata.rdf.internal.impl.literal.XSDUnsignedShortIV;
/**
* Simple InlineURIHandler that packs the localName portion of the URI into an
* appropriately sized signed integer.
*/
public class InlineUnsignedIntegerURIHandler extends InlineURIHandler {
private static final Logger log = Logger
.getLogger(InlineUnsignedIntegerURIHandler.class);
private static final BigInteger MAX_UNSIGNED_LONG_AS_BIGINT = new BigInteger(
"18446744073709551616");
public InlineUnsignedIntegerURIHandler(final String namespace) {
super(namespace);
}
@Override
@SuppressWarnings("rawtypes")
protected AbstractLiteralIV createInlineIV(final String localName) {
BigInteger value;
try {
value = new BigInteger(localName, 10);
} catch (NumberFormatException e) {
if (log.isDebugEnabled()) {
log.debug("Invalid integer", e);
}
return null;
}
if (value.compareTo(BigInteger.ZERO) <= 0) {
return null;
}
return createInlineIV(value);
}
/**
* Create the smallest AbstractLiteralIV that will fit the provided value.
* Public and static so it can be easily used as a building block for other
* InlineURIHandlders.
*
* @param value a positive integer
*/
@SuppressWarnings("rawtypes")
public static AbstractLiteralIV createInlineIV(final BigInteger value) {
if (value.compareTo(MAX_UNSIGNED_LONG_AS_BIGINT) >= 0) {
return new XSDIntegerIV(value);
}
return createInlineIV(value.longValue());
}
/**
* Create the smallest AbstractLiteralIV that will fit the provided
* value.Public and static so it can be easily used as a building block for
* other InlineURIHandlders.
*
* @param value a positive integer
*/
@SuppressWarnings("rawtypes")
public static AbstractLiteralIV createInlineIV(final long value) {
if (value < 256L) {
return new XSDUnsignedByteIV((byte) (value + Byte.MIN_VALUE));
}
if (value < 65536L) {
return new XSDUnsignedShortIV((short) (value + Short.MIN_VALUE));
}
if (value < 4294967296L) {
return new XSDUnsignedIntIV((int) (value + Integer.MIN_VALUE));
}
return new XSDUnsignedLongIV(value + Long.MIN_VALUE);
}
}