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/*
 * Copyright (C) 2014-2024 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.text.display;

import java.util.Comparator;
import java.util.Locale;

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

import com.helger.commons.compare.IComparator;

/**
 * Interface for a handler that provides the locale dependent name of an
 * object.
 *
 * @author Philip Helger
 * @param 
 *        The data type to retrieve the display text from
 */
@FunctionalInterface
public interface IDisplayTextProvider 
{
  /**
   * Get the display text of the passed object in the given locale.
   *
   * @param aObject
   *        The object to be used. May be null.
   * @param aContentLocale
   *        The display locale to be used. May not be null.
   * @return The display text of the passed object in the given locale. May be
   *         null.
   */
  @Nullable
  String getDisplayText (@Nullable DATATYPE aObject, @Nonnull Locale aContentLocale);

  @Nonnull
  default Comparator  getComparatorCollating (@Nonnull final Locale aContentLocale, @Nullable final Locale aSortLocale)
  {
    return IComparator.getComparatorCollating (x -> getDisplayText (x, aContentLocale), aSortLocale);
  }

  @Nonnull
  static IDisplayTextProvider  createHasDisplayText ()
  {
    return (x, aContentLocale) -> x == null ? null : x.getDisplayText (aContentLocale);
  }
}