org.smallmind.nutsnbolts.util.Mutation Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of smallmind-nutsnbolts Show documentation

Nuts'n'Bolts Utilities

There is a newer version: 5.9.0

/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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. See the GNU
 * General Public License or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.nutsnbolts.util;

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

@FunctionalInterface
public interface Mutation {

  static  Function identity () {

    return t -> t;
  }

  R apply (T t)
    throws Exception;

  default  Mutation compose (Mutation before) {

    Objects.requireNonNull(before);
    return (V v) -> apply(before.apply(v));
  }

  default  Mutation andThen (Mutation after) {

    Objects.requireNonNull(after);
    return (T t) -> after.apply(apply(t));
  }
}