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.cassandra.config;
  
  // checkstyle: suppress below 'blockSystemPropertyUsage'
  
  import java.util.Arrays;
  import java.util.Optional;
  
  import org.apache.cassandra.exceptions.ConfigurationException;
  
  import static org.apache.cassandra.utils.LocalizeString.toUpperCaseLocalized;
  
  public enum CassandraRelevantEnv
  {
      /**
       * Searching in the JAVA_HOME is safer than searching into System.getProperty("java.home") as the Oracle
       * JVM might use the JRE which do not contains jmap.
       */
      JAVA_HOME ("JAVA_HOME"),
      CIRCLECI("CIRCLECI"),
      CASSANDRA_SKIP_SYNC("CASSANDRA_SKIP_SYNC"),
      /** By default, the standard Cassandra CLI layout is used for backward compatibility, however,
       * the new Picocli layout can be enabled by setting this property to the {@code "picocli"}. */
      CASSANDRA_CLI_LAYOUT("CASSANDRA_CLI_LAYOUT"),
      /**
       * Allow overriding
       */
      CASSANDRA_ALLOW_CONFIG_ENVIRONMENT_VARIABLES("CASSANDRA_ALLOW_CONFIG_ENVIRONMENT_VARIABLES")
      ;
  
      CassandraRelevantEnv(String key)
      {
          this.key = key;
      }
  
      private final String key;
  
      public String getString()
      {
          return System.getenv(key);
      }
  
      /**
       * Gets the value of a system env as a boolean.
       * @return System env boolean value if it exists, false otherwise.
       */
      public boolean getBoolean()
      {
          return Boolean.parseBoolean(System.getenv(key));
      }
  
      public boolean getBooleanOrDefault(boolean defaultValue)
      {
          return Optional.ofNullable(System.getenv(key)).map(Boolean::parseBoolean).orElse(defaultValue);
      }
  
      public String getKey() {
          return key;
      }
  
      public <T extends Enum<T>> T getEnum(boolean toUppercase, Class<T> enumClass, String defaultVal)
      {
          String value = System.getenv(key);
          value = value == null ? defaultVal : value;
          try
          {
              return Enum.valueOf(enumClass, toUppercase ? toUpperCaseLocalized(value) : value);
          }
          catch (IllegalArgumentException e)
          {
              throw new ConfigurationException(String.format("Invalid value for environment variable '%s': " +
                                                             "expected one of %s (case-insensitive) but was '%s'",
                                                             key, Arrays.toString(enumClass.getEnumConstants()), value));
          }
      }
  }
  