Class EnvironmentConfiguration

java.lang.Object

org.apache.commons.configuration.event.EventSource

org.apache.commons.configuration.AbstractConfiguration

org.apache.commons.configuration.MapConfiguration

org.apache.commons.configuration.EnvironmentConfiguration

All Implemented Interfaces:

Cloneable, Configuration

public class EnvironmentConfiguration
extends MapConfiguration

A Configuration implementation that reads the platform specific environment variables using the map returned by System.getenv().

This configuration implementation is read-only. It allows read access to the defined OS environment variables, but their values cannot be changed. Any attempts to add or remove a property will throw an UnsupportedOperationException

Usage of this class is easy: After an instance has been created the get methods provided by the Configuration interface can be used for querying environment variables, e.g.:

Configuration envConfig = new EnvironmentConfiguration();
System.out.println("JAVA_HOME=" + envConfig.getString("JAVA_HOME");

Since:

1.5

Version:

$Id: EnvironmentConfiguration.java 1210171 2011-12-04 18:32:07Z oheger $

Author:

Nicolas De Loof

Field Summary

Fields inherited from class MapConfiguration

map

Fields inherited from class AbstractConfiguration

END_TOKEN, EVENT_ADD_PROPERTY, EVENT_CLEAR, EVENT_CLEAR_PROPERTY, EVENT_READ_PROPERTY, EVENT_SET_PROPERTY, START_TOKEN

Constructor Summary

Constructors

Constructor	Description
EnvironmentConfiguration()	Create a Configuration based on the environment variables.

Method Summary

Modifier and Type	Method	Description
protected void	addPropertyDirect(String key, Object value)	Adds a property to this configuration.
void	clear()	Removes all properties from this configuration.
void	clearProperty(String key)	Removes a property from this configuration.

Methods inherited from class MapConfiguration

clearPropertyDirect, clone, containsKey, getKeys, getMap, getProperty, isEmpty, isTrimmingDisabled, setTrimmingDisabled

Methods inherited from class AbstractConfiguration

addErrorLogListener, addProperty, append, copy, createInterpolator, getBigDecimal, getBigDecimal, getBigInteger, getBigInteger, getBoolean, getBoolean, getBoolean, getByte, getByte, getByte, getDefaultListDelimiter, getDelimiter, getDouble, getDouble, getDouble, getFloat, getFloat, getFloat, getInt, getInt, getInteger, getInterpolator, getKeys, getList, getList, getListDelimiter, getLogger, getLong, getLong, getLong, getProperties, getProperties, getShort, getShort, getShort, getString, getString, getStringArray, getSubstitutor, interpolate, interpolate, interpolatedConfiguration, interpolateHelper, isDelimiterParsingDisabled, isScalarValue, isThrowExceptionOnMissing, resolveContainerStore, setDefaultListDelimiter, setDelimiter, setDelimiterParsingDisabled, setListDelimiter, setLogger, setProperty, setThrowExceptionOnMissing, subset

Methods inherited from class EventSource

addConfigurationListener, addErrorListener, clearConfigurationListeners, clearErrorListeners, createErrorEvent, createEvent, fireError, fireEvent, getConfigurationListeners, getErrorListeners, isDetailEvents, removeConfigurationListener, removeErrorListener, setDetailEvents

Methods inherited from class Object

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

Constructor Details

EnvironmentConfiguration

public EnvironmentConfiguration()

Create a Configuration based on the environment variables.

See Also:

• System.getenv()

Method Details

addPropertyDirect

protected void addPropertyDirect(String key,
 Object value)

Adds a property to this configuration. Because this configuration is read-only, this operation is not allowed and will cause an exception.

Overrides:

addPropertyDirect in class MapConfiguration

Parameters:

key - the key of the property to be added

value - the property value

clearProperty

public void clearProperty(String key)

Removes a property from this configuration. Because this configuration is read-only, this operation is not allowed and will cause an exception.

Specified by:

clearProperty in interface Configuration

Overrides:

clearProperty in class AbstractConfiguration

Parameters:

key - the key of the property to be removed

clear

public void clear()

Removes all properties from this configuration. Because this configuration is read-only, this operation is not allowed and will cause an exception.

Specified by:

clear in interface Configuration

Overrides:

clear in class AbstractConfiguration