/**
* 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.sort;
import java.util.Iterator;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.queryresult.QueryResult;
import lupos.datastructures.queryresult.QueryResultDebug;
import lupos.engine.operators.Operator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.messages.ComputeIntermediateResultMessage;
import lupos.engine.operators.messages.EndOfEvaluationMessage;
import lupos.engine.operators.messages.Message;
import lupos.misc.debug.DebugStep;
import lupos.sparql1_1.Node;
/**
* This class represents a static List which is used to sort every incoming
* binding into a List given by this class.
*/
public class InsertionSort extends CollectionSort {
// List to fill
protected QueryResult list = getQR();
public InsertionSort(final Node node) {
super(node);
}
public InsertionSort() {
// nothing to init...
}
/**
* this method checks if the static List has already been created,
*
* @return true if the List had already bin created, false if not.
*/
public boolean exists() {
return !(this.list == null);
}
/**
* Adds the given binding in correct order to the List (String comparison)
*
* @param binding
* the binding to add
* @return true if successfully added
*/
@Override
protected QueryResult postProcess(final QueryResult bindings, final int id) {
for (final Iterator<Bindings> iter = bindings.iterator(); iter
.hasNext();) {
/* if( bindings.getSorted() ){merge( bindings ); return null; } */
final Bindings binding = iter.next();
try {
if (this.list.isEmpty()) {
this.list.add(binding);
break;
}
if (this.list.size() == 1) {
if (this.comparator.compare(binding, this.list.get(0)) > 0) {
this.list.addLast(binding);
break;
} else {
this.list.addFirst(binding);
break;
}
} else {
int min = 0;
int max = this.list.size() - 1;
while (min != max) {
int pos = (max + min) / 2;
if (this.comparator.compare(this.list.get(pos), binding) >= 0) {
if (this.comparator.compare(this.list.get(pos), binding) == 0) {
this.list.add(pos, binding);
getSortedQueryResult();
}
if (max == pos) {
max = max--;
} else {
max = pos;
}
} else {
if (min == pos) {
min = ++pos;
} else {
min = pos;
}
}
}
if (max == this.list.size() - 1
&& this.comparator.compare(this.list.get(max), binding) < 0) {
this.list.add(binding);
break;
}
this.list.add(max, binding);
}
} catch (final Exception e) {
e.printStackTrace();
return null;
}
}
// return getSortedQueryResult( );
return null;
}
@Override
protected QueryResult merge(final QueryResult bind) {
final Iterator<Bindings> iterBind = bind.iterator();
Bindings binding = iterBind.next();
for (int i = 0; i < this.list.size(); i++) {
if (this.comparator.compare(binding, this.list.get(i)) <= 0) {
this.list.add(i, binding);
i++;
if (iterBind.hasNext())
binding = iterBind.next();
else
break;
}
}
while (iterBind.hasNext()) {
this.list.add(iterBind.next());
}
return getSortedQueryResult();
}
@Override
public Message preProcessMessage(final EndOfEvaluationMessage msg) {
for (final Bindings b: this.list) {
for (final OperatorIDTuple opId: this.succeedingOperators) {
opId.processAll(b);
}
}
this.list = QueryResult.createInstance();
return msg;
}
@Override
public Message preProcessMessage(final ComputeIntermediateResultMessage msg) {
preProcessMessage(new EndOfEvaluationMessage());
return msg;
}
/**
* @return the List in descending order
*/
public QueryResult getSortedQueryResult() {
return this.list;
}
@Override
public QueryResult deleteQueryResult(final QueryResult queryResult,
final int operandID) {
// problem: it does not count the number of occurences of a binding
// i.e. { ?a=<a> }, { ?a=<a> } and delete { ?a=<a> } will result in
// {} instead of { ?a=<a> }!!!!!!
final Iterator<Bindings> itb = queryResult.oneTimeIterator();
while (itb.hasNext())
this.list.remove(itb.next());
return null;
}
@Override
public void deleteAll(final int operandID) {
this.list.release();
this.list = QueryResult.createInstance();
}
@Override
protected boolean isPipelineBreaker() {
return true;
}
@Override
public Message preProcessMessageDebug(
final ComputeIntermediateResultMessage msg,
final DebugStep debugstep) {
preProcessMessageDebug(new EndOfEvaluationMessage(), debugstep);
return msg;
}
@Override
public Message preProcessMessageDebug(final EndOfEvaluationMessage msg,
final DebugStep debugstep) {
for (final OperatorIDTuple opId: this.succeedingOperators) {
final QueryResultDebug qrDebug = new QueryResultDebug(this.list,
debugstep, this, opId.getOperator(), true);
((Operator) opId.getOperator()).processAllDebug(qrDebug, opId
.getId(), debugstep);
}
this.list = QueryResult.createInstance();
return msg;
}
}