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/*
* Copyright (C) 2022 Parisi Alessandro - [email protected]
* This file is part of MaterialFX (https://github.com/palexdev/MaterialFX)
*
* MaterialFX is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
*
* MaterialFX is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with MaterialFX. If not, see .
*/
package io.github.palexdev.mfxcore.collections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import java.util.Collections;
import java.util.List;
abstract class NonIterableChange extends ListChangeListener.Change {
private final int from;
private final int to;
private boolean invalid = true;
private static final int[] EMPTY_PERM = new int[0];
protected NonIterableChange(int from, int to, ObservableList list) {
super(list);
this.from = from;
this.to = to;
}
public int getFrom() {
checkState();
return from;
}
public int getTo() {
checkState();
return to;
}
protected int[] getPermutation() {
checkState();
return EMPTY_PERM;
}
public boolean next() {
if (invalid) {
invalid = false;
return true;
} else {
return false;
}
}
public void reset() {
invalid = true;
}
public void checkState() {
if (invalid) {
throw new IllegalStateException("Invalid Change state: next() must be called before inspecting the Change.");
}
}
public String toString() {
boolean oldInvalid = invalid;
invalid = false;
String ret;
if (wasPermutated()) {
ret = ChangeHelper.permChangeToString(getPermutation());
} else if (wasUpdated()) {
ret = ChangeHelper.updateChangeToString(from, to);
} else {
ret = ChangeHelper.addRemoveChangeToString(from, to, getList(), getRemoved());
}
invalid = oldInvalid;
return "{ " + ret + " }";
}
public static class SimpleUpdateChange extends NonIterableChange {
public SimpleUpdateChange(int position, ObservableList list) {
this(position, position + 1, list);
}
public SimpleUpdateChange(int from, int to, ObservableList list) {
super(from, to, list);
}
public List getRemoved() {
return Collections.emptyList();
}
public boolean wasUpdated() {
return true;
}
}
public static class SimplePermutationChange extends NonIterableChange {
private final int[] permutation;
public SimplePermutationChange(int from, int to, int[] permutation, ObservableList list) {
super(from, to, list);
this.permutation = permutation;
}
public List getRemoved() {
checkState();
return Collections.emptyList();
}
protected int[] getPermutation() {
checkState();
return permutation;
}
}
public static class SimpleAddChange extends NonIterableChange {
public SimpleAddChange(int from, int to, ObservableList list) {
super(from, to, list);
}
public boolean wasRemoved() {
checkState();
return false;
}
public List getRemoved() {
checkState();
return Collections.emptyList();
}
}
public static class SimpleRemovedChange extends NonIterableChange {
private final List removed;
public SimpleRemovedChange(int from, int to, E removed, ObservableList list) {
super(from, to, list);
this.removed = Collections.singletonList(removed);
}
public boolean wasRemoved() {
checkState();
return true;
}
public List getRemoved() {
checkState();
return removed;
}
}
public static class GenericAddRemoveChange extends NonIterableChange {
private final List removed;
public GenericAddRemoveChange(int from, int to, List removed, ObservableList list) {
super(from, to, list);
this.removed = removed;
}
public List getRemoved() {
checkState();
return removed;
}
}
}
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