/**
* 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.federated;
import java.util.Iterator;
import java.util.Set;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.items.Variable;
import lupos.datastructures.queryresult.QueryResult;
import lupos.optimizations.sparql2core_sparql.SPARQLParserVisitorImplementationDumper;
import lupos.sparql1_1.Node;
public class FederatedQuerySemiJoin extends FederatedQueryWithSucceedingJoin {
public FederatedQuerySemiJoin(Node federatedQuery) {
super(federatedQuery);
}
@Override
public String toStringQuery(final QueryResult queryResult) {
return FederatedQuerySemiJoin.toStringQuery(this.surelyBoundVariablesInServiceCall, this.variablesInServiceCall, this.federatedQuery, queryResult);
}
public static String toStringQuery(final Set<Variable> surelyBoundVariablesInServiceCall, final Set<Variable> variablesInServiceCall, final Node federatedQuery, final QueryResult queryResult) {
final SPARQLParserVisitorImplementationDumper dumper = new SPARQLParserVisitorImplementationDumper() ;
String result = "SELECT * {" + federatedQuery.jjtGetChild(1).accept(dumper);
Iterator<Bindings> bindingsIterator = queryResult.oneTimeIterator();
if(bindingsIterator.hasNext()){
result = result.substring(0, result.length()-2);
result += "}Filter(";
boolean oneOrMoreResults=false;
while (bindingsIterator.hasNext()) {
Bindings b = bindingsIterator.next();
Iterator<Variable> it = FederatedQuery.getVariablesInIntersectionOfSetOfVariablesAndBindings(variablesInServiceCall, b).iterator();
if(it.hasNext()){
result += "(";
while (it.hasNext()) {
oneOrMoreResults=true;
Variable variable = it.next();
result+="( ";
if(!surelyBoundVariablesInServiceCall.contains(variable)){
result += "(bound("+variable+") && ";
}
result +=variable+"="+variable.getLiteral(b);
if(!surelyBoundVariablesInServiceCall.contains(variable)){
result += " ) || !bound("+variable+") ";
}
if(it.hasNext()){
result+=" ) && ";
} else {
result +=" ))";
}
}
if(bindingsIterator.hasNext())
result +=" || ";
}
}
if(!oneOrMoreResults){
result+=" true ";
}
result += "). }";
}
return result;
}
}