package org.madore.damlengine;

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

public final class TodoDeque {

    // FIXME: having everything static is ugly as hell...  maybe this
    // should be instantiatable?

    private TodoDeque() { }  // Forbid instantiation

    private static LinkedList<TodoItem> todoDeque = new LinkedList<TodoItem>();

    {
	todoDeque = new LinkedList<TodoItem>();
    }

    public static void registerAtEnd(TodoItem it) {
	todoDeque.addLast(it);
    }

    public static void registerAtEnd(Collection<TodoItem> them) {
	todoDeque.addAll(them);
    }

    public static void registerAtStart(TodoItem it) {
	todoDeque.addFirst(it);
    }

    public static void registerAtStart(Collection<TodoItem> them) {
	todoDeque.addAll(0, them);
    }

    public static TodoItem removeNext() {
	return todoDeque.poll();
    }

    public static boolean dispatchOne() {
	TodoItem it = removeNext();
	if ( it != null ) {
	    it.dispatch();
	    return true;
	} else
	    return false;
    }

    public static void dispatchLoop() {
	while ( dispatchOne() )
	    ;
    }

}