/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - 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.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
package lupos.rif.operator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.items.Item;
import lupos.datastructures.items.Variable;
import lupos.datastructures.queryresult.QueryResult;
import lupos.engine.operators.index.BasicIndexScan;
import lupos.engine.operators.messages.BoundVariablesMessage;
import lupos.engine.operators.messages.Message;
import lupos.engine.operators.tripleoperator.TriplePattern;
public class BindableTripleIndexScan extends BindableIndexScan {
public BindableTripleIndexScan(final BasicIndexScan index) {
super(index);
}
@Override
public Message preProcessMessage(final BoundVariablesMessage msg) {
final BoundVariablesMessage result = (BoundVariablesMessage) index
.preProcessMessage(msg);
result.getVariables().removeAll(msg.getVariables());
unionVariables = new HashSet<Variable>(result.getVariables());
intersectionVariables = new HashSet<Variable>(unionVariables);
return result;
}
protected void processIndexScan(final QueryResult result,
final Bindings bind) {
final Collection<TriplePattern> pattern = new ArrayList<TriplePattern>(
index.getTriplePattern());
final Collection<TriplePattern> bindPattern = new ArrayList<TriplePattern>();
for (final TriplePattern tp : pattern) {
final TriplePattern newPat = new TriplePattern();
int i = 0;
for (final Item item : tp.getItems()) {
Item toSet = null;
if (item.isVariable() && bind.getVariableSet().contains(item))
toSet = item.getLiteral(bind);
else
toSet = item;
newPat.setPos(toSet, i++);
}
bindPattern.add(newPat);
}
index.getTriplePattern().clear();
index.getTriplePattern().addAll(bindPattern);
// Scan durchf�hren
QueryResult tempResult = index.process(dataSet);
result.add(tempResult);
// TriplePattern zur�cksetzen
index.getTriplePattern().clear();
index.getTriplePattern().addAll(pattern);
}
@Override
public Collection<TriplePattern> getTriplePattern() {
return index.getTriplePattern();
}
}