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There is a newer version: 1.1.2-RELEASE

package hope.kola.contract.utils;

import java.util.function.Consumer;
import java.util.function.Supplier;

public class Helper {

  public static  T firstNotNull(T... candidate) {
    for (final T c : candidate) {
      if (c != null) {
        return c;
      }
    }
    return null;
  }

  public static  void firstNotNullAssign(Consumer set, T... candidate) {
    for (final T c : candidate) {
      if (c != null) {
        set.accept(c);
      }
    }
  }

  public static  void doMerger(Supplier get1, Supplier get2, Consumer set) {
    T _new = get2.get();
    if (_new != null) {
      set.accept(_new);
    }
    set.accept(get1.get());
  }

  public static  T _get(
      final Supplier getter, final Supplier factory, final Consumer setter) {
    T target = getter.get();
    if (target == null) {
      target = factory.get();
      setter.accept(target);
    }
    return target;
  }

  // There will be a chain call down
  // $?.student?.address
  public static  T _set(
      final Supplier getter,
      final Supplier factory,
      final Consumer setter,
      final Consumer assign) {
    T target = _get(getter, factory, setter);
    assign.accept(target);
    return target;
  }
}