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Java date time library based on joda time

There is a newer version: 9.5.5

/**
 * Copyright (C) 2014-2020 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.helger.datetime.domain;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.ValueEnforcer;

/**
 * Interface for objects having a last modification date time.
 *
 * @author Philip Helger
 */
@FunctionalInterface
public interface IHasLastModificationDateTime
{
  /**
   * @return The last modification date time or null if the object
   *         has not been modified yet.
   */
  @Nullable
  LocalDateTime getLastModificationDateTime ();

  default boolean hasLastModificationDateTime ()
  {
    return getLastModificationDateTime () != null;
  }

  @Nullable
  default LocalDate getLastModificationDate ()
  {
    final LocalDateTime aLDT = getLastModificationDateTime ();
    return aLDT == null ? null : aLDT.toLocalDate ();
  }

  @Nullable
  default LocalTime getLastModificationTime ()
  {
    final LocalDateTime aLDT = getLastModificationDateTime ();
    return aLDT == null ? null : aLDT.toLocalTime ();
  }

  /**
   * Check if the object was modified at the specified local date time. This is
   * true, if the modified time is ≤ than the specified local
   * date time.
   *
   * @param aDT
   *        The time to check for modification. May not be null.
   * @return true if this object was modified, false
   *         if not.
   * @since 9.1.6
   */
  default boolean isLastModifiedAt (@Nonnull final LocalDateTime aDT)
  {
    ValueEnforcer.notNull (aDT, "LocalDateTime");
    return hasLastModificationDateTime () && getLastModificationDateTime ().compareTo (aDT) <= 0;
  }
}