/**
* 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.rif.operator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.items.Item;
import lupos.datastructures.items.Variable;
import lupos.datastructures.items.literal.Literal;
import lupos.datastructures.items.literal.URILiteral;
import lupos.datastructures.queryresult.ParallelIterator;
import lupos.datastructures.queryresult.QueryResult;
import lupos.datastructures.queryresult.QueryResultDebug;
import lupos.engine.operators.Operator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.misc.Tuple;
import lupos.misc.debug.DebugStep;
import lupos.misc.debug.DebugStepRIF;
import lupos.rdf.Prefix;
import lupos.rif.datatypes.Predicate;
import lupos.rif.datatypes.RuleResult;
public class ConstructPredicate extends Operator {
final private List<Tuple<URILiteral, List<Item>>> patternList = new ArrayList<Tuple<URILiteral, List<Item>>>();
public ConstructPredicate() {
super();
}
public ConstructPredicate(final URILiteral name, final Item... params) {
this();
addPattern(name, params);
}
public void setPredicatePattern(
final List<Tuple<URILiteral, List<Item>>> patternList) {
this.patternList.clear();
this.patternList.addAll(patternList);
}
public List<Tuple<URILiteral, List<Item>>> getPredicatePattern() {
return this.patternList;
}
public void addPattern(final URILiteral name, final Item... params) {
final Tuple<URILiteral, List<Item>> item = new Tuple<URILiteral, List<Item>>(
name, Arrays.asList(params));
this.patternList.add(item);
}
@Override
public QueryResult process(final QueryResult queryResult,
final int operandID) {
final RuleResult result = new RuleResult();
final Iterator<Bindings> pib = queryResult.oneTimeIterator();
// Create predicate
while (pib.hasNext()) {
final Bindings bind = pib.next();
result.add(bind);
for (final Tuple<URILiteral, List<Item>> item : this.patternList) {
final Predicate pred = new Predicate();
pred.setName(item.getFirst());
for (int idx = 0; idx < item.getSecond().size(); idx++)
if (item.getSecond().get(idx).isVariable())
pred.getParameters().add(
bind.get((Variable) item.getSecond().get(idx)));
else
pred.getParameters().add(
(Literal) item.getSecond().get(idx));
result.getPredicateResults().add(pred);
}
}
if (pib instanceof ParallelIterator)
((ParallelIterator<Bindings>) pib).close();
return result;
}
@Override
public void processAllDebug(final QueryResult queryResult,
final int operandID, final DebugStep debugstep) {
final QueryResult opp = process(queryResult, operandID);
final RuleResult rr = (RuleResult) opp;
if (opp == null)
return;
if (this.succeedingOperators.size() > 1) {
opp.materialize();
}
for (final OperatorIDTuple opId : this.succeedingOperators) {
((DebugStepRIF)debugstep).step(this, opId.getOperator(), rr);
final QueryResultDebug qrDebug = new QueryResultDebug(opp,
debugstep, this, opId.getOperator(), true);
((Operator) opId.getOperator()).processAllDebug(qrDebug,
opId.getId(), debugstep);
}
}
@Override
public String toString() {
final StringBuffer str = new StringBuffer();
str.append("ConstructPredicate: ").append("\n");
for (final Tuple<URILiteral, List<Item>> item : this.patternList) {
str.append(item.getFirst().toString()).append("(");
for (int idx = 0; idx < item.getSecond().size(); idx++) {
str.append(item.getSecond().get(idx).toString());
if (idx < item.getSecond().size() - 1)
str.append(", ");
else
str.append(")");
}
if (str.substring(str.length() - 1) != ")")
str.append(")");
str.append("\n");
}
return str.toString();
}
@Override
public String toString(final Prefix prefixInstance) {
final StringBuffer str = new StringBuffer();
str.append("ConstructPredicate: ").append("\n");
for (final Tuple<URILiteral, List<Item>> item : this.patternList) {
str.append(item.getFirst().toString(prefixInstance)).append("(");
for (int idx = 0; idx < item.getSecond().size(); idx++) {
if (item.getSecond().get(idx).isVariable())
str.append(item.getSecond().get(idx).toString());
else
str.append(((Literal) item.getSecond().get(idx))
.toString(prefixInstance));
if (idx < item.getSecond().size() - 1)
str.append(", ");
else
str.append(")");
}
if (str.substring(str.length() - 1) != ")")
str.append(")");
str.append("\n");
}
return str.toString();
}
}