Class EnvironmentLookup

java.lang.Object
org.apache.commons.lang.text.StrLookup
org.apache.commons.configuration.interpol.EnvironmentLookup

public class EnvironmentLookup extends org.apache.commons.lang.text.StrLookup

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
  • Constructor Details

  • Method Details

    • lookup

      public String lookup(String key)
      Performs a lookup for the specified variable. This implementation directly delegates to a EnvironmentConfiguration.
      Specified by:
      lookup in class org.apache.commons.lang.text.StrLookup
      Parameters:
      key - the key to lookup
      Returns:
      the value of this key or null if it cannot be resolved