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.runners.flink.translation.wrappers.streaming;
  
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Function;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.FluentIterable;
  import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  class StreamRecordStripper {
  
    @SuppressWarnings("Guava")
    static <T> Iterable<WindowedValue<T>> stripStreamRecordFromWindowedValue(Iterable<Object> input) {
      return FluentIterable.from(input)
          .filter(
              o ->
                  o instanceof StreamRecord && ((StreamRecord) o).getValue() instanceof WindowedValue)
          .transform(
              new Function<Object, WindowedValue<T>>() {
                @Override
                @SuppressWarnings({"unchecked", "rawtypes"})
                public @Nullable WindowedValue<T> apply(@Nullable Object o) {
                  if (o instanceof StreamRecord
                      && ((StreamRecord) o).getValue() instanceof WindowedValue) {
                    return (WindowedValue) ((StreamRecord) o).getValue();
                  }
                  throw new RuntimeException("unreachable");
                }
              });
    }
  }
  