Class SystemPropertiesLookup

  • All Implemented Interfaces:
    Lookup

    public class SystemPropertiesLookup
    extends java.lang.Object
    implements Lookup

    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
    Version:
    $Id: SystemPropertiesLookup.java 1679786 2015-05-16 17:47:09Z oheger $
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object lookup​(java.lang.String variable)
      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 Detail

      • SystemPropertiesLookup

        public SystemPropertiesLookup()
    • Method Detail

      • lookup

        public java.lang.Object lookup​(java.lang.String variable)
        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