Package eu.stratosphere.test.recordJobs.relational.query9Util

Source Code of eu.stratosphere.test.recordJobs.relational.query9Util.LineItemMap

/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.test.recordJobs.relational.query9Util;

import eu.stratosphere.api.java.record.functions.MapFunction;
import eu.stratosphere.test.recordJobs.util.Tuple;
import eu.stratosphere.types.Record;
import eu.stratosphere.util.Collector;

@SuppressWarnings("serial")
public class LineItemMap extends MapFunction {
 
  /**
   * Filter "lineitem".
   *
   * Output Schema:
   *  Key: orderkey
   *  Value: (partkey, suppkey, quantity, price)
   *
   */
  @Override
  public void map(Record record, Collector<Record> out) throws Exception
  {
    Tuple inputTuple = record.getField(1, Tuple.class);
   
    /* Extract the year from the date element of the order relation: */
   
    /* pice = extendedprice * (1 - discount): */
    float price = Float.parseFloat(inputTuple.getStringValueAt(5)) * (1 - Float.parseFloat(inputTuple.getStringValueAt(6)));
    /* Project (orderkey | partkey, suppkey, linenumber, quantity, extendedprice, discount, tax, ...) to (partkey, suppkey, quantity): */
    inputTuple.project((0 << 0) | (1 << 1) | (1 << 2) | (0 << 3) | (1 << 4));
    inputTuple.addAttribute("" + price);
    record.setField(1, inputTuple);
    out.collect(record);
  }

}
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