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 org.apache.beam.sdk.transforms.windowing;
  
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.joda.time.Duration;
  
  /**
   * Exposes window package private properties for testing.
   *
   * @param <T> type of input element
   */
  public class WindowDesc<T> {
  
    public static <T> WindowDesc<T> of(Window<T> window) {
      return new WindowDesc<>(window);
    }
  
    private final Window<T> window;
  
    private WindowDesc(Window<T> window) {
      this.window = window;
    }
  
    /**
     * {@link Window#getWindowFn()}.
     *
     * @return windowFn
     */
    @SuppressWarnings("unchecked")
    public WindowFn<Object, ?> getWindowFn() {
      return (WindowFn) window.getWindowFn();
    }
  
    /**
     * {@link Window#getTrigger()}.
     *
     * @return trigger
     */
    public Trigger getTrigger() {
      return window.getTrigger();
    }
  
    /**
     * {@link Window#getAccumulationMode()}.
     *
     * @return accumulation mode
     */
    public WindowingStrategy.AccumulationMode getAccumulationMode() {
      return window.getAccumulationMode();
    }
  
    /**
     * {@link Window#getAllowedLateness()}.
     *
     * @return allowed lateness
     */
    public Duration getAllowedLateness() {
      return window.getAllowedLateness();
    }
  }
  