/**
* 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.helper;
import java.util.Collection;
import lupos.datastructures.items.Item;
import lupos.engine.operators.BasicOperator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.index.Dataset;
import lupos.engine.operators.multiinput.join.Join;
import lupos.engine.operators.stream.Stream;
import lupos.engine.operators.tripleoperator.TriggerOneTime;
import lupos.engine.operators.tripleoperator.TriplePattern;
import lupos.engine.operators.tripleoperator.patternmatcher.PatternMatcher;
public class IndexScanCreator_Stream implements IndexScanCreatorInterface {
protected PatternMatcher currentPatternMatcher = new PatternMatcher();
protected Stream stream = null;
public IndexScanCreator_Stream(){
}
@Override
public BasicOperator getRoot() {
if(this.stream != null) {
return this.stream;
} else {
return this.currentPatternMatcher;
}
}
public void setStream(final Stream stream){
this.stream = stream;
}
public Stream getStream(){
return this.stream;
}
public PatternMatcher getCurrentPatternMatcher() {
return this.currentPatternMatcher;
}
public void setCurrentPatternMatcher(final PatternMatcher currentPatternMatcher) {
this.currentPatternMatcher = currentPatternMatcher;
}
@Override
public BasicOperator createIndexScanAndConnectWithRoot(final OperatorIDTuple opID, final Collection<TriplePattern> triplePatterns, final Item graphConstraint) {
if(triplePatterns.size()>1){
final Join join = new Join();
int i=0;
for(final TriplePattern tp : triplePatterns){
this.currentPatternMatcher.add(tp);
tp.addSucceedingOperator(new OperatorIDTuple(join, i));
i++;
}
if(opID!=null) {
join.addSucceedingOperator(opID);
}
return join;
} else if(triplePatterns.size()==1){
final TriplePattern tp = triplePatterns.iterator().next();
if(opID!=null) {
tp.addSucceedingOperator(opID);
}
this.currentPatternMatcher.add(tp);
return tp;
} else {
throw new Error("There should be at least one Triple Pattern given!");
}
}
@Override
public void createEmptyIndexScanSubmittingQueryResultWithOneEmptyBindingsAndConnectWithRoot(final OperatorIDTuple opID, final Item graphConstraint) {
if(graphConstraint!=null) {
throw new Error("This evaluator does not support named graphs!");
}
final TriggerOneTime trigger = new TriggerOneTime(true);
this.currentPatternMatcher.addSucceedingOperator(trigger);
if(opID!=null) {
trigger.addSucceedingOperator(opID);
}
}
@Override
public void createEmptyIndexScanAndConnectWithRoot(final OperatorIDTuple opID) {
final TriggerOneTime trigger = new TriggerOneTime(false);
this.currentPatternMatcher.addSucceedingOperator(trigger);
if(opID!=null) {
trigger.addSucceedingOperator(opID);
}
}
@Override
public Dataset getDataset() {
throw new UnsupportedOperationException("This evaluator does not support index structures!");
}
@Override
public void addDefaultGraph(final String defaultgraph) {
throw new UnsupportedOperationException("This evaluator does not support different default graphs!");
}
@Override
public void addNamedGraph(final String namedgraph) {
throw new UnsupportedOperationException("This evaluator does not support named graphs!");
}
}