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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.crunch.impl.spark.fn;

import org.apache.crunch.MapFn;
import org.apache.crunch.Pair;
import org.apache.crunch.impl.spark.SparkRuntimeContext;
import org.apache.spark.api.java.function.Function;
import scala.Tuple2;

public class PairMapFunction implements Function, S> {
  private final MapFn, S> fn;
  private final SparkRuntimeContext ctxt;
  private boolean initialized;

  public PairMapFunction(MapFn, S> fn, SparkRuntimeContext ctxt) {
    this.fn = fn;
    this.ctxt = ctxt;
  }

  @Override
  public S call(Tuple2 kv) throws Exception {
    if (!initialized) {
      ctxt.initialize(fn, null);
      initialized = true;
    }
    return fn.map(Pair.of(kv._1(), kv._2()));
  }
}