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RevolvingList.java
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RevolvingList.java
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/**
* Copyright (c) SpaceToad, 2011 http://www.mod-buildcraft.com
*
* BuildCraft is distributed under the terms of the Minecraft Mod Public License
* 1.0, or MMPL. Please check the contents of the license located in
* http://www.mod-buildcraft.com/MMPL-1.0.txt
*/
package buildcraft.core.utils;
import com.google.common.collect.ForwardingCollection;
import java.util.*;
/**
*
* @author CovertJaguar <http://www.railcraft.info>
*/
public class RevolvingList<T> extends ForwardingCollection<T> {
private Deque<T> list = new LinkedList<T>();
public RevolvingList() {
}
public RevolvingList(Collection<? extends T> collection) {
list.addAll(collection);
}
@Override
protected Collection<T> delegate() {
return list;
}
public void rotateLeft() {
if (list.isEmpty())
return;
list.addFirst(list.removeLast());
}
public void rotateRight() {
if (list.isEmpty())
return;
list.addLast(list.removeFirst());
}
public T getCurrent() {
if (list.isEmpty())
return null;
return list.getFirst();
}
public void setCurrent(T e) {
if (!contains(e))
return;
if (e == null) {
while (getCurrent() != null) {
rotateRight();
}
} else {
while (getCurrent() == null || !getCurrent().equals(e)) {
rotateRight();
}
}
}
}