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A reactive Java web server.

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/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Baratine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.v5.amp.stream;

import io.baratine.function.BinaryOperatorAsync;
import io.baratine.service.Result;

import java.util.function.BinaryOperator;

@SuppressWarnings("serial")
public class AccumCombinerBinOp
  implements BinaryOperatorAsync>
{
  private BinaryOperator _combiner;
  
  public AccumCombinerBinOp(BinaryOperator combiner)
  {
    _combiner = combiner;
  }
  
  @Override
  public void apply(Accum sumA, Accum sumB, Result> result)
  {
    if (sumA == null) {
      result.ok(sumB);
      return;
    }
    else if (sumB == null) {
      result.ok(sumA);
      return;
    }
    
    U valueA = sumA.get();
    U valueB = sumB.get();
    
    U value;
    
    if (valueA == null) {
      value = valueB;
    }
    else if (valueB == null) {
      value = valueA;
    }
    else {
      value = _combiner.apply(sumA.get(), sumB.get());
    }
    
    result.ok(new Accum<>(value));
  }
}