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  /*
   * This file is available under and governed by the GNU General Public
   * License version 2 only, as published by the Free Software Foundation.
   * However, the following notice accompanied the original version of this
   * file:
   *
   * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
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   *    this list of conditions and the following disclaimer.
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   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
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   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
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  package java.time.temporal;
  
  import java.time.DateTimeException;
  
  /**
   * Strategy for adjusting a temporal object.
   * <p>
   * Adjusters are a key tool for modifying temporal objects.
   * They exist to externalize the process of adjustment, permitting different
   * approaches, as per the strategy design pattern.
   * Examples might be an adjuster that sets the date avoiding weekends, or one that
   * sets the date to the last day of the month.
   * <p>
   * There are two equivalent ways of using a {@code TemporalAdjuster}.
   * The first is to invoke the method on this interface directly.
   * The second is to use {@link Temporal#with(TemporalAdjuster)}:
   * <pre>
   *   // these two lines are equivalent, but the second approach is recommended
   *   temporal = thisAdjuster.adjustInto(temporal);
   *   temporal = temporal.with(thisAdjuster);
   * </pre>
   * It is recommended to use the second approach, {@code with(TemporalAdjuster)},
   * as it is a lot clearer to read in code.
   * <p>
   * The {@link TemporalAdjusters} class contains a standard set of adjusters,
   * available as static methods.
   * These include:
   * <ul>
   * <li>finding the first or last day of the month
   * <li>finding the first day of next month
   * <li>finding the first or last day of the year
   * <li>finding the first day of next year
   * <li>finding the first or last day-of-week within a month, such as "first Wednesday in June"
   * <li>finding the next or previous day-of-week, such as "next Thursday"
   * </ul>
   *
   * @implSpec
   * This interface places no restrictions on the mutability of implementations,
   * however immutability is strongly recommended.
   *
   * @see TemporalAdjusters
   * @since 1.8
   */
  @FunctionalInterface
  public interface TemporalAdjuster {
  
      /**
       * Adjusts the specified temporal object.
       * <p>
       * This adjusts the specified temporal object using the logic
       * encapsulated in the implementing class.
       * Examples might be an adjuster that sets the date avoiding weekends, or one that
       * sets the date to the last day of the month.
       * <p>
       * There are two equivalent ways of using this method.
       * The first is to invoke this method directly.
       * The second is to use {@link Temporal#with(TemporalAdjuster)}:
       * <pre>
       *   // these two lines are equivalent, but the second approach is recommended
       *   temporal = thisAdjuster.adjustInto(temporal);
       *   temporal = temporal.with(thisAdjuster);
       * </pre>
       * It is recommended to use the second approach, {@code with(TemporalAdjuster)},
       * as it is a lot clearer to read in code.
       *
       * @implSpec
       * The implementation must take the input object and adjust it.
       * The implementation defines the logic of the adjustment and is responsible for
       * documenting that logic. It may use any method on {@code Temporal} to
       * query the temporal object and perform the adjustment.
       * The returned object must have the same observable type as the input object
       * <p>
       * The input object must not be altered.
       * Instead, an adjusted copy of the original must be returned.
       * This provides equivalent, safe behavior for immutable and mutable temporal objects.
       * <p>
       * The input temporal object may be in a calendar system other than ISO.
       * Implementations may choose to document compatibility with other calendar systems,
       * or reject non-ISO temporal objects by {@link TemporalQueries#chronology() querying the chronology}.
       * <p>
       * This method may be called from multiple threads in parallel.
       * It must be thread-safe when invoked.
       *
       * @param temporal  the temporal object to adjust, not null
       * @return an object of the same observable type with the adjustment made, not null
       * @throws DateTimeException if unable to make the adjustment
       * @throws ArithmeticException if numeric overflow occurs
       */
      Temporal adjustInto(Temporal temporal);
  
  }
  