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.nexmark.queries;
  
  import org.apache.beam.sdk.nexmark.NexmarkConfiguration;
  import org.apache.beam.sdk.nexmark.model.Bid;
  import org.apache.beam.sdk.nexmark.model.Event;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.values.PCollection;
  
  /**
   * Query 1, 'Currency Conversion'. Convert each bid value from dollars to euros. In CQL syntax:
   *
   * <pre>
   * SELECT Istream(auction, DOLTOEUR(price), bidder, datetime)
   * FROM bid [ROWS UNBOUNDED];
   * </pre>
   *
   * <p>To make things more interesting, allow the 'currency conversion' to be arbitrarily slowed
   * down.
   */
  public class Query1 extends NexmarkQueryTransform<Bid> {
    public Query1(NexmarkConfiguration configuration) {
      super("Query1");
    }
  
    @Override
    public PCollection<Bid> expand(PCollection<Event> events) {
      return events
          // Only want the bid events.
          .apply(NexmarkQueryUtil.JUST_BIDS)
  
          // Map the conversion function over all bids.
          .apply(
              name + ".ToEuros",
              ParDo.of(
                  new DoFn<Bid, Bid>() {
                    @ProcessElement
                    public void processElement(ProcessContext c) {
                      Bid bid = c.element();
                      c.output(
                          new Bid(
                              bid.auction,
                              bid.bidder,
                              (bid.price * 89) / 100,
                              bid.dateTime,
                              bid.extra));
                    }
                  }));
    }
  }
  