/**
* 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.modifiers.distinct;
import java.util.LinkedList;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.queryresult.QueryResult;
import lupos.datastructures.queryresult.QueryResultDebug;
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 class InMemoryListDistinct extends Distinct {
protected LinkedList<Bindings> bindings = new LinkedList<Bindings>();
@Override
public QueryResult process(final QueryResult _bindings, final int operandID) {
for (final Bindings b : _bindings) {
if (!this.bindings.contains(b)) {
this.bindings.add(b);
}
}
return null;
}
@Override
public Message preProcessMessage(final EndOfEvaluationMessage msg) {
for (final Bindings b : this.bindings) {
for (final OperatorIDTuple opId : this.succeedingOperators) {
opId.processAll(b);
}
}
this.bindings.clear();
return msg;
}
@Override
public Message preProcessMessage(final ComputeIntermediateResultMessage msg) {
preProcessMessage(new EndOfEvaluationMessage());
return msg;
}
@Override
public Message preProcessMessageDebug(
final ComputeIntermediateResultMessage msg,
final DebugStep debugstep) {
preProcessMessageDebug(new EndOfEvaluationMessage(), debugstep);
return msg;
}
@Override
public Message preProcessMessageDebug(final EndOfEvaluationMessage msg,
final DebugStep debugstep) {
final QueryResult qr = QueryResult.createInstance();
for (final Bindings b : this.bindings)
qr.add(b);
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);
}
this.bindings.clear();
return msg;
}
}