/**
* 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.engine.operators.singleinput.sort;
import java.util.Iterator;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.queryresult.ParallelIterator;
import lupos.datastructures.queryresult.QueryResult;
import lupos.datastructures.queryresult.QueryResultDebug;
import lupos.datastructures.sorteddata.SortedBag;
import lupos.engine.operators.Operator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.messages.ComputeIntermediateResultMessage;
import lupos.engine.operators.messages.EndOfEvaluationMessage;
import lupos.engine.operators.messages.Message;
import lupos.misc.debug.DebugStep;
public abstract class SortedBagSort extends Sort {
protected SortedBag<Bindings> sswd;
public SortedBagSort() {
super();
}
public SortedBagSort(final SortedBag<Bindings> sswd,
final lupos.sparql1_1.Node node) {
super(node);
this.sswd = sswd;
}
@Override
public synchronized QueryResult process(final QueryResult bindings,
final int operandID) {
final Iterator<Bindings> itb = bindings.oneTimeIterator();
while (itb.hasNext()) {
this.sswd.add(itb.next());
}
return null;
}
protected ParallelIterator<Bindings> getIterator() {
final Iterator<Bindings> itb = this.sswd.iterator();
return new ParallelIterator<Bindings>() {
@Override
public void close() {
// derived classes may override the above method in order to
// release some resources here!
}
@Override
public boolean hasNext() {
return itb.hasNext();
}
@Override
public Bindings next() {
return itb.next();
}
@Override
public void remove() {
itb.remove();
}
};
}
private void computeResult(){
final QueryResult qr = QueryResult.createInstance(this.getIterator());
if (this.succeedingOperators.size() > 1) {
qr.materialize();
}
for (final OperatorIDTuple opId : this.succeedingOperators) {
opId.processAll(qr);
}
}
@Override
public Message preProcessMessage(final EndOfEvaluationMessage msg) {
this.computeResult();
return msg;
}
@Override
public Message preProcessMessage(final ComputeIntermediateResultMessage msg) {
this.computeResult();
return msg;
}
@Override
public QueryResult deleteQueryResult(final QueryResult queryResult, final int operandID) {
// problem: it does not count the number of occurences of a binding
// i.e. { ?a=<a> }, { ?a=<a> } and delete { ?a=<a> } will result in
// {} instead of { ?a=<a> }!!!!!!
final Iterator<Bindings> itb = queryResult.oneTimeIterator();
while (itb.hasNext()) {
this.sswd.remove(itb.next());
}
return null;
}
@Override
public void deleteAll(final int operandID) {
this.sswd.clear();
}
@Override
protected boolean isPipelineBreaker() {
return true;
}
private void computeResultDebug(final DebugStep debugstep){
final QueryResult qr = QueryResult.createInstance(this.getIterator());
if (this.succeedingOperators.size() > 1) {
qr.materialize();
}
for (final OperatorIDTuple opId : this.succeedingOperators) {
final QueryResultDebug qrDebug = new QueryResultDebug(qr,
debugstep, this, opId.getOperator(), true);
((Operator) opId.getOperator()).processAllDebug(qrDebug, opId
.getId(), debugstep);
}
}
@Override
public Message preProcessMessageDebug(
final ComputeIntermediateResultMessage msg,
final DebugStep debugstep) {
this.computeResultDebug(debugstep);
return msg;
}
@Override
public Message preProcessMessageDebug(final EndOfEvaluationMessage msg,
final DebugStep debugstep) {
this.computeResultDebug(debugstep);
return msg;
}
}