Class EnvironmentLookup
java.lang.Object
org.apache.commons.lang.text.StrLookup
org.apache.commons.configuration.interpol.EnvironmentLookup
A specialized lookup implementation that allows access to environment variables.
This implementation relies on EnvironmentConfiguration
to resolve
environment variables. It can be used for referencing environment variables
in configuration files in an easy way, for instance:
java.home = ${env:JAVA_HOME}
EnvironmentLookup
is one of the standard lookups that is
registered per default for each configuration.
- Since:
- 1.7
- Version:
- $Id: EnvironmentLookup.java 1210620 2011-12-05 20:57:31Z oheger $
- Author:
- Commons Configuration team
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class org.apache.commons.lang.text.StrLookup
mapLookup, noneLookup, systemPropertiesLookup
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Constructor Details
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EnvironmentLookup
public EnvironmentLookup()
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Method Details
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lookup
Performs a lookup for the specified variable. This implementation directly delegates to aEnvironmentConfiguration
.- Specified by:
lookup
in classorg.apache.commons.lang.text.StrLookup
- Parameters:
key
- the key to lookup- Returns:
- the value of this key or null if it cannot be resolved
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