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Java 1.8+ Library with tons of utility classes required in all projects
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/*
 * Copyright (C) 2014-2022 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.commons.datetime;

import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.FormatStyle;
import java.util.Locale;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

import com.helger.commons.annotation.PresentForCodeCoverage;

/**
 * Create common {@link FormatStyle} patterns to format date, time and datetime
 * objects.
 *
 * @author Philip Helger
 */
@Immutable
public final class PDTFormatPatterns
{
  @PresentForCodeCoverage
  private static final PDTFormatPatterns INSTANCE = new PDTFormatPatterns ();

  private PDTFormatPatterns ()
  {}

  @Nonnull
  public static String getPatternDate (@Nonnull final FormatStyle eStyle, @Nonnull final Locale aDisplayLocale)
  {
    return DateTimeFormatterBuilder.getLocalizedDateTimePattern (eStyle, null, IsoChronology.INSTANCE, aDisplayLocale);
  }

  @Nonnull
  public static String getDefaultPatternDate (@Nonnull final Locale aDisplayLocale)
  {
    return getMediumPatternDate (aDisplayLocale);
  }

  @Nonnull
  public static String getShortPatternDate (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDate (FormatStyle.SHORT, aDisplayLocale);
  }

  @Nonnull
  public static String getMediumPatternDate (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDate (FormatStyle.MEDIUM, aDisplayLocale);
  }

  @Nonnull
  public static String getLongPatternDate (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDate (FormatStyle.LONG, aDisplayLocale);
  }

  @Nonnull
  public static String getFullPatternDate (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDate (FormatStyle.FULL, aDisplayLocale);
  }

  @Nonnull
  public static String getPatternTime (@Nonnull final FormatStyle eStyle, @Nonnull final Locale aDisplayLocale)
  {
    return DateTimeFormatterBuilder.getLocalizedDateTimePattern (null, eStyle, IsoChronology.INSTANCE, aDisplayLocale);
  }

  @Nonnull
  public static String getDefaultPatternTime (@Nonnull final Locale aDisplayLocale)
  {
    return getMediumPatternTime (aDisplayLocale);
  }

  @Nonnull
  public static String getShortPatternTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternTime (FormatStyle.SHORT, aDisplayLocale);
  }

  @Nonnull
  public static String getMediumPatternTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternTime (FormatStyle.MEDIUM, aDisplayLocale);
  }

  @Nonnull
  public static String getLongPatternTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternTime (FormatStyle.LONG, aDisplayLocale);
  }

  @Nonnull
  public static String getFullPatternTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternTime (FormatStyle.FULL, aDisplayLocale);
  }

  @Nonnull
  public static String getPatternDateTime (@Nonnull final FormatStyle eStyle, @Nonnull final Locale aDisplayLocale)
  {
    return DateTimeFormatterBuilder.getLocalizedDateTimePattern (eStyle, eStyle, IsoChronology.INSTANCE, aDisplayLocale);
  }

  @Nonnull
  public static String getDefaultPatternDateTime (@Nonnull final Locale aDisplayLocale)
  {
    return getMediumPatternDateTime (aDisplayLocale);
  }

  @Nonnull
  public static String getShortPatternDateTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDateTime (FormatStyle.SHORT, aDisplayLocale);
  }

  @Nonnull
  public static String getMediumPatternDateTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDateTime (FormatStyle.MEDIUM, aDisplayLocale);
  }

  @Nonnull
  public static String getLongPatternDateTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDateTime (FormatStyle.LONG, aDisplayLocale);
  }

  @Nonnull
  public static String getFullPatternDateTime (@Nonnull final Locale aDisplayLocale)
  {
    return getPatternDateTime (FormatStyle.FULL, aDisplayLocale);
  }
}