buildcraft.core.lib.utils.RevolvingList.java Source code

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Here is the source code for buildcraft.core.lib.utils.RevolvingList.java

Source

/**
 * Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 * <p/>
 * 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.lib.utils;

import java.util.Collection;
import java.util.Deque;
import java.util.LinkedList;

import com.google.common.collect.ForwardingCollection;

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;
        } else {
            list.addFirst(list.removeLast());
        }
    }

    public void rotateRight() {
        if (list.isEmpty()) {
            return;
        } else {
            list.addLast(list.removeFirst());
        }
    }

    public T getCurrent() {
        if (list.isEmpty()) {
            return null;
        } else {
            return list.getFirst();
        }
    }

    public void setCurrent(T e) {
        if (!contains(e)) {
            return;
        } else if (e == null) {
            while (getCurrent() != null) {
                rotateRight();
            }
        } else {
            while (getCurrent() == null || !getCurrent().equals(e)) {
                rotateRight();
            }
        }
    }
}