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 java.io.InputStream;
  import java.io.OutputStream;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.sdk.coders.StructuredCoder;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  
  /** The default window into which all data is placed (via {@link GlobalWindows}). */
  public class GlobalWindow extends BoundedWindow {
    /** Singleton instance of {@link GlobalWindow}. */
    public static final GlobalWindow INSTANCE = new GlobalWindow();
  
    // Triggers use maxTimestamp to set timers' timestamp. Timers fires when
    // the watermark passes their timestamps. So, the maxTimestamp needs to be
    // smaller than the TIMESTAMP_MAX_VALUE.
    // One standard day is subtracted from TIMESTAMP_MAX_VALUE to make sure
    // the maxTimestamp is smaller than TIMESTAMP_MAX_VALUE even after rounding up
    // to seconds or minutes.
    private static final Instant END_OF_GLOBAL_WINDOW = extractMaxTimestampFromProto();
  
    @Override
    public Instant maxTimestamp() {
      return END_OF_GLOBAL_WINDOW;
    }
  
    @Override
    public boolean equals(@Nullable Object other) {
      return other instanceof GlobalWindow;
    }
  
    @Override
    public int hashCode() {
      return GlobalWindow.class.hashCode();
    }
  
    @Override
    public String toString() {
      return "GlobalWindow";
    }
  
    private GlobalWindow() {}
  
    /** {@link Coder} for encoding and decoding {@code GlobalWindow}s. */
    public static class Coder extends StructuredCoder<GlobalWindow> {
      public static final Coder INSTANCE = new Coder();
  
      @Override
      public void encode(GlobalWindow window, OutputStream outStream) {}
  
      @Override
      public GlobalWindow decode(InputStream inStream) {
        return GlobalWindow.INSTANCE;
      }
  
      @Override
      public void verifyDeterministic() {}
  
      @Override
      public boolean consistentWithEquals() {
        return true;
      }
  
      @Override
      public final List<org.apache.beam.sdk.coders.Coder<?>> getCoderArguments() {
        return Collections.emptyList();
      }
  
      private Coder() {}
    }
  
    /** Parses the max timestamp for global windows from the proto. */
    private static Instant extractMaxTimestampFromProto() {
      return new Instant(
          Long.parseLong(
              RunnerApi.BeamConstants.Constants.GLOBAL_WINDOW_MAX_TIMESTAMP_MILLIS
                  .getValueDescriptor()
                  .getOptions()
                  .getExtension(RunnerApi.beamConstant)));
    }
  }
  