/**
* 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.messages.BoundVariablesMessage;
import lupos.engine.operators.messages.Message;
import lupos.engine.operators.tripleoperator.TriplePattern;
import lupos.rif.datatypes.RuleResult;
public class BindablePredicateIndexScan extends BindableIndexScan {
private final PredicatePattern predicatePattern;
public BindablePredicateIndexScan(final PredicateIndexScan index, final PredicatePattern pattern) {
super(index);
this.predicatePattern = pattern;
}
@Override
public Message preProcessMessage(final BoundVariablesMessage msg) {
final BoundVariablesMessage result = (BoundVariablesMessage) this.predicatePattern
.preProcessMessage(msg);
result.getVariables().removeAll(msg.getVariables());
this.unionVariables = new HashSet<Variable>(result.getVariables());
this.intersectionVariables = new HashSet<Variable>(this.unionVariables);
return result;
}
@Override
protected void processIndexScan(final QueryResult result, final Bindings bind) {
final Item[] newItems = new Item[this.predicatePattern.getPatternItems()
.size()];
int i = 0;
for (final Item item : this.predicatePattern.getPatternItems()) {
Item toSet = null;
if (item.isVariable() && bind.getVariableSet().contains(item)) {
toSet = item.getLiteral(bind);
} else {
toSet = item;
}
newItems[i++] = toSet;
}
final PredicatePattern newPattern = new PredicatePattern(
this.predicatePattern.getPredicateName(), newItems);
// Scan durchf�hren
final RuleResult ruleResult = (RuleResult) this.index.process(this.dataSet);
final QueryResult tempResult = newPattern.process(ruleResult, 0);
result.add(tempResult);
}
@Override
public Collection<TriplePattern> getTriplePattern() {
return new ArrayList<TriplePattern>();
}
}