Package org.apache.commons.configuration2.interpol

Class SystemPropertiesLookup

java.lang.Object

org.apache.commons.configuration2.interpol.SystemPropertiesLookup

All Implemented Interfaces:

Lookup

@Deprecated
public class SystemPropertiesLookup
extends Object
implements Lookup

Deprecated.

Use DefaultLookups.SYSTEM_PROPERTIES.

A specialized implementation of the Lookup interface that allows access to system properties.

This implementation relies on StrLookup.systemPropertiesLookup() from the Commons Lang project to resolve system properties. It can be used for referencing system properties in configuration files in an easy way, for instance:

 current.user = ${sys:user.name}
 

SystemPropertiesLookup is one of the standard lookups that is registered per default for each configuration.

Since:

2.0

Constructor Summary

Constructors

Constructor	Description
SystemPropertiesLookup()	Deprecated.

Method Summary

Modifier and Type	Method	Description
Object	lookup(String variable)	Deprecated. Looks up the value of the specified variable.

Methods inherited from class java.lang.Object

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

Constructor Details

SystemPropertiesLookup

public SystemPropertiesLookup()

Deprecated.

Method Details

lookup

public Object lookup(String variable)

Deprecated.

Description copied from interface: Lookup

Looks up the value of the specified variable. This method is called by ConfigurationInterpolator with the variable name extracted from the expression to interpolate (i.e. the prefix name has already been removed). A concrete implementation has to return the value of this variable or null if the variable name is unknown.

Specified by:

lookup in interface Lookup

Parameters:

variable - the name of the variable to be resolved

Returns:

the value of this variable or null