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public abstract class IndexedSet<TYPE_KEY extends Object,TYPE_DATA extends Object> {
	//this class implements the ArrayList<TYPE_DATA> interface but was omitted due to length

	private HashMap<TYPE_KEY,TYPE_DATA > cells;
}

public abstract class IndexedSequence<TYPE_KEY extends Object,TYPE_DATA extends Object> extends IndexedSet<TYPE_KEY,TYPE_DATA>{
	
	private ArrayList<TYPE_KEY> cellsOrder;

	public Entry<TYPE_KEY, TYPE_DATA> get(int pos) {
		TYPE_KEY k=cellsOrder.get(pos);
		return new Pair<TYPE_KEY, TYPE_DATA>(k,internal().get(k));
	}
}

public abstract class TableCore<TYPE_KEY extends Object,TYPE_DATA extends Object>{
	/**
	 * Method to get the TYPE_DATA key.
	 * Must be overridden by the class that implements a specific table.
	 * 
	 * @param r is the instance of TYPE_DATA
	 * @return the key of the given instance
	 */
	protected abstract TYPE_KEY getKey(TYPE_ROW r);
//the above method is used anywhere a key is needed in this class
}

public class TableBasic<TYPE_DATA extends Object> extends TableCore<Integer, TYPE_DATA>{
	
	@Override
	protected Integer getKey(TYPE_DATA r) {
		return r.hashCode();
	}
}

public class Table extends TableCore<UUID, TYPE_DATA extends MyData>{
	
	@Override
	protected UUID getKey(TYPE_DATA r) {
		return r.id();
	}
}