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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package java.util;

/**
 * A collection designed for holding elements prior to processing. Deque
 *
 * @param  element type.
 */
public interface Deque extends Queue {

  void addFirst(E e);

  void addLast(E e);

  Iterator descendingIterator();

  E getFirst();

  E getLast();

  boolean offerFirst(E e);

  boolean offerLast(E e);

  E peekFirst();

  E peekLast();

  E pollFirst();

  E pollLast();

  E pop();

  void push(E e);

  E removeFirst();

  boolean removeFirstOccurrence(Object o);

  E removeLast();

  boolean removeLastOccurrence(Object o);

}