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The OpenTripPlanner multimodal journey planning system

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package org.opentripplanner.framework.functional;

import java.util.Objects;
import java.util.function.Function;

public class FunctionUtils {

  @FunctionalInterface
  public interface TriFunction {
    R apply(A a, B b, C c);

    default  TriFunction andThen(Function after) {
      Objects.requireNonNull(after);
      return (A a, B b, C c) -> after.apply(apply(a, b, c));
    }
  }
}