/**
* 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.HashSet;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.items.Variable;
import lupos.datastructures.items.literal.Literal;
import lupos.datastructures.queryresult.QueryResult;
import lupos.sparql1_1.Node;
public class FederatedQueryJoinAtEndpoint extends FederatedQueryWithoutSucceedingJoin {
public FederatedQueryJoinAtEndpoint(final Node federatedQuery) {
super(federatedQuery);
}
@Override
public QueryResult process(final QueryResult queryResult, final int operandID) {
return FederatedQueryWithSucceedingJoin.process(queryResult, this.endpoint, this.toStringQuery(queryResult), this.bindingsFactory);
}
public String toStringQuery(final QueryResult queryResult) {
queryResult.materialize();
String query = FederatedQuerySemiJoin.toStringQuery(this.surelyBoundVariablesInServiceCall, this.variablesInServiceCall, this.federatedQuery, queryResult);
if(queryResult.isEmpty()){
return query;
}
final HashSet<Variable> vars = new HashSet<Variable>();
for(final Bindings bindings: queryResult){
vars.addAll(bindings.getVariableSet());
}
query += "\nVALUES ( ";
for(final Variable var: vars){
query += var.toString()+" ";
}
query+=") {";
for(final Bindings bindings: queryResult){
query+="\n(";
boolean firstTime=true;
for(final Variable var: vars){
if(firstTime){
firstTime = false;
} else {
query += " ";
}
final Literal literal = bindings.get(var);
if(literal==null){
query += "UNDEF";
} else {
query += literal.toString();
}
}
query+=")";
}
return query+" }";
}
}