/**
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
*/
/*
* Created on Feb 12, 2007
*/
package com.bigdata.btree.proc;
import com.bigdata.btree.Errors;
import com.bigdata.btree.IIndex;
import com.bigdata.btree.proc.AbstractKeyArrayIndexProcedure.ResultBuffer;
import com.bigdata.btree.raba.IRaba;
import com.bigdata.btree.raba.codec.IRabaCoder;
/**
* Batch lookup operation.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public class BatchLookup extends AbstractKeyArrayIndexProcedure<ResultBuffer> implements
IParallelizableIndexProcedure<ResultBuffer> {
/**
*
*/
private static final long serialVersionUID = 8102720738892338403L;
/**
* Factory for {@link BatchLookup} procedures.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public static class BatchLookupConstructor extends AbstractKeyArrayIndexProcedureConstructor<BatchLookup> {
public static final BatchLookupConstructor INSTANCE = new BatchLookupConstructor();
private BatchLookupConstructor() {
}
/**
* Values ARE NOT sent.
*/
@Override
public final boolean sendValues() {
return false;
}
@Override
public BatchLookup newInstance(final IRabaCoder keysCoder,
final IRabaCoder valsCoder, final int fromIndex, final int toIndex,
final byte[][] keys, final byte[][] vals) {
if (vals != null)
throw new IllegalArgumentException(Errors.ERR_VALS_NOT_NULL);
return new BatchLookup(keysCoder, valsCoder, fromIndex, toIndex,
keys);
}
}
/**
* De-serialization ctor.
*
*/
public BatchLookup() {
}
/**
* Create a batch lookup operation.
*
* @param keys
* The array of keys (one key per tuple).
*
* @see BatchLookupConstructor
*/
protected BatchLookup(IRabaCoder keysCoder, IRabaCoder valsCoder,
int fromIndex, int toIndex, byte[][] keys) {
super(keysCoder, valsCoder, fromIndex, toIndex, keys, null/* values */);
}
@Override
public final boolean isReadOnly() {
return true;
}
/**
* @return {@link ResultBuffer}
*/
@Override
public ResultBuffer applyOnce(final IIndex ndx, final IRaba keys, final IRaba vals) {
final int n = keys.size();
final byte[][] ret = new byte[n][];
int i = 0;
while (i < n) {
ret[i] = ndx.lookup(keys.get(i));
i++;
}
return new ResultBuffer(n, ret, ndx.getIndexMetadata()
.getTupleSerializer().getLeafValuesCoder());
}
@Override
protected IResultHandler<ResultBuffer, ResultBuffer> newAggregator() {
return new ResultBufferHandler(getKeys().size(), getValuesCoder());
}
}