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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.commons.configuration;
    19
    20  import java.util.Iterator;
    21
    22  /***
    23   * A configuration based on the system properties.
    24   *
    25   * @author Emmanuel Bourg
    26   * @version $Revision: 727834 $, $Date: 2008-12-18 23:16:32 +0100 (Do, 18 Dez 2008) $
    27   * @since 1.1
    28   */
    29  public class SystemConfiguration extends MapConfiguration
    30  {
    31      /***
    32       * Create a Configuration based on the system properties.
    33       *
    34       * @see System#getProperties
    35       */
    36      public SystemConfiguration()
    37      {
    38          super(System.getProperties());
    39      }
    40
    41      /***
    42       * The method allows system properties to be set from a property file.
    43       * @param fileName The name of the property file.
    44       * @throws Exception if an error occurs.
    45       */
    46      public static void setSystemProperties(String fileName) throws Exception
    47      {
    48          PropertiesConfiguration config = fileName.endsWith(".xml")
    49              ? new XMLPropertiesConfiguration(fileName) : new PropertiesConfiguration(fileName);
    50          setSystemProperties(config);
    51      }
    52
    53      /***
    54       * Set System properties from a configuration file.
    55       * @param systemConfig The configuration containing the properties to be set.
    56       */
    57      public static void setSystemProperties(PropertiesConfiguration systemConfig)
    58      {
    59          Iterator iter = systemConfig.getKeys();
    60          while (iter.hasNext())
    61          {
    62              String key = (String) iter.next();
    63              String value = (String) systemConfig.getProperty(key);
    64              System.setProperty(key, value);
    65          }
    66      }
    67  }