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.twister2.translators.functions;
  
  import edu.iu.dsc.tws.api.tset.TSetContext;
  import edu.iu.dsc.tws.api.tset.fn.ComputeCollectorFunc;
  import edu.iu.dsc.tws.api.tset.fn.RecordCollector;
  import java.util.Iterator;
  import org.apache.beam.sdk.transforms.join.RawUnionValue;
  import org.apache.beam.sdk.values.WindowedValue;
  
  /** Output tag filter. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class OutputTagFilter<OutputT, InputT>
      implements ComputeCollectorFunc<WindowedValue<OutputT>, Iterator<RawUnionValue>> {
  
    private int tag;
  
    public OutputTagFilter() {
      // non arg constructor needed for kryo
    }
  
    public OutputTagFilter(int tag) {
      this.tag = tag;
    }
  
    @Override
    public void compute(
        Iterator<RawUnionValue> input, RecordCollector<WindowedValue<OutputT>> output) {
      RawUnionValue temp;
      while (input.hasNext()) {
        temp = input.next();
        if (temp.getUnionTag() == tag) {
          output.collect((WindowedValue<OutputT>) temp.getValue());
        }
      }
    }
  
    @Override
    public void prepare(TSetContext context) {}
  }
  