/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.aspects;
import jetbrains.mps.util.containers.MultiMap;
import jetbrains.mps.util.containers.SetBasedMultiMap;
import org.apache.log4j.Logger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
public class InOrderSorter<T extends OrderParticipant<String>> {
private Collection<T> myItems;
public InOrderSorter(Collection<T> items) {
myItems = items;
}
public static final Logger LOG = Logger.getLogger(InOrderSorter.class);
public List<T> sort() {
Comparator<T> sourceIndependent = (o1, o2) -> {
int r1 = o1.compareTo(o2);
int r2 = o2.compareTo(o1);
return Math.max(r1, -r2);
};
MultiMap<T, T> greater = new SetBasedMultiMap<T, T>();
for (T item1: myItems) {
for (T item2: myItems) {
if (sourceIndependent.compare(item1, item2) > 0) {
greater.putValue(item1, item2);
}
}
}
{
boolean changed;
do {
changed = false;
for (T item1 : myItems) {
for (T item2 : new ArrayList<T>(greater.get(item1))) {
Collection<T> toAdd = greater.get(item2);
changed |= !greater.get(item1).containsAll(toAdd);
greater.putValues(item1, toAdd);
}
}
} while (changed);
}
ArrayList<T> items = new ArrayList<>(myItems);
items.sort(Comparator.comparing(OrderParticipant::getId));
ArrayList<T> sorted = new ArrayList<>();
while (!items.isEmpty()) {
boolean changed = false;
for (T candidate : items) {
if (sorted.containsAll(greater.get(candidate))) {
sorted.add(candidate);
items.remove(candidate);
changed = true;
break;
}
}
if (!changed) {
LOG.error("aspects sorting conflict: " + items);
sorted.addAll(items);
items.clear();
}
}
return sorted;
}
}