content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 backtype.storm.windowing;
  
  import java.util.List;
  
  /**
   * A view of events in a sliding window.
   *
   * @param <T> the type of event that this window contains. E.g. {@link org.apache.storm.tuple.Tuple}
   */
  public interface Window<T> {
      /**
       * Gets the list of events in the window.
       *
       * @return the list of events in the window.
       */
      List<T> get();
  
      /**
       * Get the list of newly added events in the window since the last time the window was generated.
       *
       * @return the list of newly added events in the window.
       */
      List<T> getNew();
  
      /**
       * Get the list of events expired from the window since the last time the window was generated.
       *
       * @return the list of events expired from the window.
       */
      List<T> getExpired();
  }
  