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Java SDK to connect to the Onegini platform

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/*
 * Copyright 2013-2020 Onegini b.v.
 *
 * 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.onegini.sdk.util;

import static java.util.Optional.empty;
import static java.util.Optional.of;
import static java.util.Optional.ofNullable;

import java.util.Locale;
import java.util.Optional;

public final class LocaleFromNameExtractor {

  private LocaleFromNameExtractor() {
  }

  public static Optional extractLocaleFromMessageFileName(final String resourceFileName) {
    final Optional localeString = extractLocaleFromFilename(resourceFileName);
    if (localeString.isPresent()) {
      final Locale locale = LocaleCodeUtils.getByCode(localeString.get());
      return ofNullable(locale);
    } else {
      return empty();
    }
  }

  private static Optional extractLocaleFromFilename(final String filename) {
    if (filename.contains(LocaleCodeUtils.UNDERSCORE)) {
      final int localeStartIndex = filename.indexOf(LocaleCodeUtils.UNDERSCORE) + 1;
      final int localeEndIndex = filename.indexOf(".properties");
      return of(filename.substring(localeStartIndex, localeEndIndex));
    } else {
      return empty();
    }
  }


}