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.samza.runtime;
  
  import java.util.Collection;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  
  /** Samza operator for {@link org.apache.beam.sdk.transforms.windowing.Window.Assign}. */
  public class WindowAssignOp<T, W extends BoundedWindow> implements Op<T, T, Void> {
    private final WindowFn<T, W> windowFn;
  
    public WindowAssignOp(WindowFn<T, W> windowFn) {
      this.windowFn = windowFn;
    }
  
    @Override
    public void processElement(WindowedValue<T> inputElement, OpEmitter<T> emitter) {
      final Collection<W> windows;
      try {
        windows = windowFn.assignWindows(new SamzaAssignContext<>(windowFn, inputElement));
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
  
      windows.stream()
          .map(
              window ->
                  WindowedValues.of(
                      inputElement.getValue(),
                      inputElement.getTimestamp(),
                      window,
                      inputElement.getPaneInfo()))
          .forEach(outputElement -> emitter.emitElement(outputElement));
    }
  }
  