From e11bce7ad3e803e80883499fec0ad6e4540ffe43 Mon Sep 17 00:00:00 2001
From: Kristóf Marussy <marussy@mit.bme.hu>
Date: Tue, 30 Jun 2020 18:03:48 +0200
Subject: Add modified VIATRA-DSE version

---
 .../dse/objectives/LeveledObjectivesHelper.java    | 114 +++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/objectives/LeveledObjectivesHelper.java

(limited to 'Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/objectives/LeveledObjectivesHelper.java')

diff --git a/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/objectives/LeveledObjectivesHelper.java b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/objectives/LeveledObjectivesHelper.java
new file mode 100644
index 00000000..2d81629b
--- /dev/null
+++ b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/objectives/LeveledObjectivesHelper.java
@@ -0,0 +1,114 @@
+/*******************************************************************************
+ * 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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