/**
* 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.sparql1_1.operatorgraph;
import lupos.datastructures.items.Variable;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.multiinput.join.Join;
import lupos.engine.operators.singleinput.Projection;
import lupos.engine.operators.singleinput.SeveralSucceedingOperators;
import lupos.engine.operators.singleinput.federated.FederatedQueryTrivialApproach;
import lupos.engine.operators.singleinput.modifiers.distinct.Distinct;
import lupos.sparql1_1.ASTService;
import lupos.sparql1_1.ASTVar;
import lupos.sparql1_1.Node;
import lupos.sparql1_1.operatorgraph.helper.IndexScanCreatorInterface;
import lupos.sparql1_1.operatorgraph.helper.OperatorConnection;
public class ServiceGeneratorTrivialApproach extends ServiceGenerator {
@Override
public boolean countsAsJoinPartner(final ASTService node){
return !(node.jjtGetChild(0) instanceof ASTVar);
}
@Override
public void insertIndependantFederatedQueryOperator(final ASTService node, final OperatorConnection connection, final IndexScanCreatorInterface indexScanCreator){
FederatedQueryTrivialApproach federatedQuery = new FederatedQueryTrivialApproach(node);
federatedQuery.setSucceedingOperator(connection.getOperatorIDTuple());
indexScanCreator.createEmptyIndexScanAndConnectWithRoot(new OperatorIDTuple(federatedQuery, 0));
}
@Override
public void insertFederatedQueryOperator(final ASTService node, final OperatorConnection connection){
Node child0 = node.jjtGetChild(0);
if (child0 instanceof ASTVar) {
Join join = new Join();
connection.connect(join);
SeveralSucceedingOperators sso = new SeveralSucceedingOperators();
sso.addSucceedingOperator(join, 0);
FederatedQueryTrivialApproach federatedQuery = new FederatedQueryTrivialApproach(node);
Projection projection = new Projection();
projection.addProjectionElement(new Variable(((ASTVar)child0).getName()));
Distinct distinct = new Distinct();
projection.addSucceedingOperator(distinct);
distinct.addSucceedingOperator(federatedQuery);
sso.addSucceedingOperator(projection, 0);
federatedQuery.addSucceedingOperator(join, 1);
connection.setOperatorConnection(sso);
}
}
}