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/*******************************************************************************
* Copyright (c) 2010-2016, Andras Szabolcs Nagy and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.viatra.dse.objectives;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
public class LeveledObjectivesHelper {
private List<IObjective> objectives = new ArrayList<IObjective>();
private IObjective[][] leveledObjectives;
public LeveledObjectivesHelper(List<IObjective> objectives) {
this.objectives = objectives;
}
public IObjective[][] initLeveledObjectives() {
if (objectives.isEmpty()) {
leveledObjectives = new IObjective[0][0];
return leveledObjectives;
}
int level = objectives.get(0).getLevel();
boolean oneLevelOnly = true;
for (IObjective objective : objectives) {
if (objective.getLevel() != level) {
oneLevelOnly = false;
break;
}
}
if (oneLevelOnly) {
leveledObjectives = new IObjective[1][objectives.size()];
for (int i = 0; i < objectives.size(); i++) {
leveledObjectives[0][i] = objectives.get(i);
}
return leveledObjectives;
}
IObjective[] objectivesArray = getSortedByLevelObjectives(objectives);
int numberOfLevels = getNumberOfObjectiveLevels(objectivesArray);
leveledObjectives = new IObjective[numberOfLevels][];
fillLeveledObjectives(objectivesArray);
return leveledObjectives;
}
private void fillLeveledObjectives(IObjective[] objectivesArray) {
int actLevel = objectivesArray[0].getLevel();
int levelIndex = 0;
int lastIndex = 0;
int corrigationForLastLevel = 0;
boolean oneObjectiveAtLastLevel = false;
for (int i = 0; i < objectivesArray.length; i++) {
if (i == objectivesArray.length - 1) {
corrigationForLastLevel = 1;
if (objectivesArray[i - 1].getLevel() != objectivesArray[i].getLevel()) {
oneObjectiveAtLastLevel = true;
corrigationForLastLevel = 0;
}
}
if (objectivesArray[i].getLevel() != actLevel || corrigationForLastLevel == 1 || oneObjectiveAtLastLevel) {
leveledObjectives[levelIndex] = new IObjective[i - lastIndex + corrigationForLastLevel];
for (int j = lastIndex; j < i + corrigationForLastLevel; j++) {
leveledObjectives[levelIndex][j - lastIndex] = objectivesArray[j];
}
if (oneObjectiveAtLastLevel) {
leveledObjectives[levelIndex + 1] = new IObjective[1];
leveledObjectives[levelIndex + 1][0] = objectivesArray[i];
}
actLevel = objectivesArray[i].getLevel();
levelIndex++;
lastIndex = i;
}
}
}
private int getNumberOfObjectiveLevels(IObjective[] objectivesArray) {
int actLevel = objectivesArray[0].getLevel();
int numberOfLevels = 1;
for (int i = 1; i < objectivesArray.length; i++) {
if (objectivesArray[i].getLevel() != actLevel) {
numberOfLevels++;
actLevel = objectivesArray[i].getLevel();
}
}
return numberOfLevels;
}
private IObjective[] getSortedByLevelObjectives(List<IObjective> objectives) {
IObjective[] objectivesArray = objectives.toArray(new IObjective[objectives.size()]);
Arrays.sort(objectivesArray, Comparator.comparingInt(IObjective::getLevel));
return objectivesArray;
}
public IObjective[][] getLeveledObjectives() {
return leveledObjectives;
}
}
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