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.util.List;
  import org.apache.beam.sdk.transforms.windowing.Trigger.OnceTrigger;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Objects;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  
  /**
   * <i><b>FOR INTERNAL USE ONLY</b></i>. A trigger that fires after synchronized processing time has
   * reached the processing time of the first element's arrival.
   *
   * <p>This is for internal, primarily as a "continuation trigger" for {@link AfterProcessingTime}
   * triggers. In that use, this trigger is ready as soon as all upstream workers processing time
   * clocks have caught up to the moment that input arrived.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class AfterSynchronizedProcessingTime extends OnceTrigger {
  
    public static AfterSynchronizedProcessingTime ofFirstElement() {
      return new AfterSynchronizedProcessingTime();
    }
  
    private AfterSynchronizedProcessingTime() {
      super(null);
    }
  
    @Override
    public Instant getWatermarkThatGuaranteesFiring(BoundedWindow window) {
      return BoundedWindow.TIMESTAMP_MAX_VALUE;
    }
  
    @Override
    protected Trigger getContinuationTrigger(List<Trigger> continuationTriggers) {
      return this;
    }
  
    @Override
    public String toString() {
      return "AfterSynchronizedProcessingTime.pastFirstElementInPane()";
    }
  
    @Override
    public boolean equals(@Nullable Object obj) {
      return this == obj || obj instanceof AfterSynchronizedProcessingTime;
    }
  
    @Override
    public int hashCode() {
      return Objects.hashCode(AfterSynchronizedProcessingTime.class);
    }
  }
  