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/**
 * 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.lens.ml.algo.spark;

import org.apache.hadoop.io.WritableComparable;
import org.apache.hive.hcatalog.data.HCatRecord;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.mllib.regression.LabeledPoint;

import scala.Tuple2;

/**
 * Function to map an HCatRecord to a feature vector usable by MLLib.
 */
public abstract class FeatureFunction implements Function, LabeledPoint> {

  /*
   * (non-Javadoc)
   *
   * @see org.apache.spark.api.java.function.Function#call(java.lang.Object)
   */
  @Override
  public abstract LabeledPoint call(Tuple2 tuple) throws Exception;
}