com.google.cloud.dataflow.sdk.transforms.windowing.NonMergingWindowFn Maven / Gradle / Ivy

Go to download
/*
 * Copyright (C) 2015 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 com.google.cloud.dataflow.sdk.transforms.windowing;

/**
 * Abstract base class for {@link WindowFn}s that do not merge windows.
 *
 * @param  type of elements being windowed
 * @param  {@link BoundedWindow} subclass used to represent the windows used by this
 *            {@code WindowFn}
 */
public abstract class NonMergingWindowFn
    extends WindowFn {
  private static final long serialVersionUID = 0;

  @Override
  public final void mergeWindows(MergeContext c) { }

  @Override
  public boolean isNonMerging() {
    return true;
  }
}