content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to you 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 org.apache.calcite.util.format.postgresql;
  
  import com.google.common.base.Strings;
  
  import java.util.Locale;
  
  /**
   * Casing styles that can be applied to a string.
   */
  public enum CapitalizationEnum {
    ALL_UPPER,
    ALL_LOWER,
    CAPITALIZED;
  
    /**
     * Applies the casing style to a string. The string is treated as one word.
     *
     * @param s string to transform
     * @param locale Locale to use when transforming the string
     * @return s with the casing style applied
     */
    public String apply(String s, Locale locale) {
      switch (this) {
      case ALL_UPPER:
        return s.toUpperCase(locale);
      case ALL_LOWER:
        return s.toLowerCase(locale);
      default:
        if (Strings.isNullOrEmpty(s)) {
          return s;
        }
  
        return s.substring(0, 1).toUpperCase(locale) + s.substring(1).toLowerCase(locale);
      }
    }
  }
  