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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.statecoding.stateequivalence;
import org.eclipse.collections.api.map.primitive.IntIntMap;
import tools.refinery.store.statecoding.Morphism;
import java.util.List;
public class PermutationMorphism implements Morphism {
private final IntIntMap object2PermutationGroup;
private final List<? extends List<? extends IntIntMap>> permutationsGroups;
private final int[] selection;
private boolean hasNext;
PermutationMorphism(IntIntMap object2PermutationGroup,
List<? extends List<? extends IntIntMap>> permutationsGroups) {
this.object2PermutationGroup = object2PermutationGroup;
this.permutationsGroups = permutationsGroups;
this.selection = new int[this.permutationsGroups.size()];
this.hasNext = true;
}
public boolean next() {
return next(0);
}
private boolean next(int position) {
if (position >= permutationsGroups.size()) {
this.hasNext = false;
return false;
}
if (selection[position] + 1 < permutationsGroups.get(position).size()) {
selection[position] = selection[position] + 1;
return true;
} else {
selection[position] = 0;
return next(position + 1);
}
}
@Override
public int get(int object) {
if(!hasNext) {
throw new IllegalArgumentException("No next permutation!");
}
final int groupIndex = object2PermutationGroup.get(object);
final var selectedGroup = permutationsGroups.get(groupIndex);
final int permutationIndex = selection[groupIndex];
final var selectedPermutation = selectedGroup.get(permutationIndex);
return selectedPermutation.get(object);
}
@Override
public int getSize() {
return object2PermutationGroup.size();
}
}
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