org.apache.commons.configuration2

## Class SystemConfiguration

- java.lang.Object
- - org.apache.commons.configuration2.event.BaseEventSource
  - - org.apache.commons.configuration2.AbstractConfiguration
    - - org.apache.commons.configuration2.MapConfiguration
      - - org.apache.commons.configuration2.SystemConfiguration

- All Implemented Interfaces:
    Cloneable, Configuration, EventSource, ImmutableConfiguration, SynchronizerSupport

      public class SystemConfiguration
      extends MapConfiguration

  A configuration based on the system properties.
  Since:
    1.1
  Version:
    $Id: SystemConfiguration.java 1678603 2015-05-10 20:08:48Z oheger $
  Author:
    Emmanuel Bourg

- - ### Field Summary

    - ### Fields inherited from class org.apache.commons.configuration2.MapConfiguration

      `map`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SystemConfiguration()` Create a Configuration based on the system properties.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected Iterator<String>` | `getKeysInternal()` Actually creates an iterator for iterating over the keys in this configuration.
    `static void` | `setSystemProperties(Configuration systemConfig)` Set System properties from a configuration object.
    `static void` | `setSystemProperties(String fileName)` Sets system properties from a file specified by its file name.
    `static void` | `setSystemProperties(String basePath, String fileName)` Sets system properties from a file specified using its base path and file name.

    - ### Methods inherited from class org.apache.commons.configuration2.MapConfiguration

      `addPropertyDirect, clearPropertyDirect, clone, containsKeyInternal, getMap, getPropertyInternal, isEmptyInternal, isTrimmingDisabled, setTrimmingDisabled, sizeInternal`

    - ### Methods inherited from class org.apache.commons.configuration2.AbstractConfiguration

      `addErrorLogListener, addProperty, addPropertyInternal, append, beginRead, beginWrite, clear, clearInternal, clearProperty, cloneInterpolator, containsKey, copy, endRead, endWrite, get, get, getArray, getArray, getBigDecimal, getBigDecimal, getBigInteger, getBigInteger, getBoolean, getBoolean, getBoolean, getByte, getByte, getByte, getCollection, getCollection, getConfigurationDecoder, getConversionHandler, getDouble, getDouble, getDouble, getEncodedString, getEncodedString, getFloat, getFloat, getFloat, getInt, getInt, getInteger, getInterpolator, getKeys, getKeys, getKeysInternal, getList, getList, getList, getList, getListDelimiterHandler, getLogger, getLong, getLong, getLong, getProperties, getProperties, getProperty, getShort, getShort, getShort, getString, getString, getStringArray, getSynchronizer, immutableSubset, installInterpolator, interpolate, interpolate, interpolatedConfiguration, isEmpty, isScalarValue, isThrowExceptionOnMissing, lock, setConfigurationDecoder, setConversionHandler, setDefaultLookups, setInterpolator, setListDelimiterHandler, setLogger, setParentInterpolator, setPrefixLookups, setProperty, setPropertyInternal, setSynchronizer, setThrowExceptionOnMissing, size, subset, unlock`

    - ### Methods inherited from class org.apache.commons.configuration2.event.BaseEventSource

      `addEventListener, clearErrorListeners, clearEventListeners, copyEventListeners, createErrorEvent, createEvent, fireError, fireEvent, getEventListenerRegistrations, getEventListeners, isDetailEvents, removeEventListener, setDetailEvents`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SystemConfiguration

          public SystemConfiguration()

      Create a Configuration based on the system properties.
      See Also:
        `System.getProperties()`

  - ### Method Detail

    - #### setSystemProperties

          public static void setSystemProperties(String fileName)
                                          throws ConfigurationException

      Sets system properties from a file specified by its file name. This is just a short cut for `setSystemProperties(null, fileName)`.
      Parameters:
        `fileName` - The name of the property file.
      Throws:
        `ConfigurationException` - if an error occurs.
      Since:
        1.6

    - #### setSystemProperties

          public static void setSystemProperties(String basePath,
                                                 String fileName)
                                          throws ConfigurationException

      Sets system properties from a file specified using its base path and file name. The file can either be a properties file or an XML properties file. It is loaded, and all properties it contains are added to system properties.
      Parameters:
        `basePath` - The base path to look for the property file.
        `fileName` - The name of the property file.
      Throws:
        `ConfigurationException` - if an error occurs.
      Since:
        1.6

    - #### setSystemProperties

          public static void setSystemProperties(Configuration systemConfig)

      Set System properties from a configuration object.
      Parameters:
        `systemConfig` - The configuration containing the properties to be set.
      Since:
        1.6

    - #### getKeysInternal

          protected Iterator<String> getKeysInternal()

      Actually creates an iterator for iterating over the keys in this configuration. This method is called by `getKeys()`, it has to be defined by concrete subclasses. This implementation returns a snapshot of the keys in the system properties. If another thread modifies system properties concurrently, these changes are not reflected by the iterator returned by this method.
      Overrides:
        `getKeysInternal` in class `MapConfiguration`
      Returns:
        an `Iterator` with all property keys in this configuration

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