Class MainMapLookup

    • Constructor Detail

      • MainMapLookup

        public MainMapLookup()
        Constructor when used directly as a plugin.
    • Method Detail

      • setMainArguments

        public static void setMainArguments​(String... args)
        An application's public static main(String[]) method calls this method to make its main arguments available for lookup with the prefix main.

        The map provides two kinds of access: First by index, starting at "0", "1" and so on. For example, the command line --file path/file.txt -x 2 can be accessed from a configuration file with:

        • "main:0" = "--file"
        • "main:1" = "path/file.txt"
        • "main:2" = "-x"
        • "main:3" = "2"

        Second using the argument at position n as the key to access the value at n+1.

        • "main:--file" = "path/file.txt"
        • "main:-x" = "2"
        Parameters:
        args - An application's public static main(String[]) arguments.
      • lookup

        public String lookup​(LogEvent event,
                             String key)
        Description copied from interface: StrLookup
        Looks up a String key to a String value possibly using the current LogEvent.

        The internal implementation may use any mechanism to return the value. The simplest implementation is to use a Map. However, virtually any implementation is possible.

        For example, it would be possible to implement a lookup that used the key as a primary key, and looked up the value on demand from the database Or, a numeric based implementation could be created that treats the key as an integer, increments the value and return the result as a string - converting 1 to 2, 15 to 16 etc.

        This method always returns a String, regardless of the underlying data, by converting it as necessary. For example:

         Map<String, Object> map = new HashMap<String, Object>();
         map.put("number", new Integer(2));
         assertEquals("2", StrLookup.mapLookup(map).lookup("number"));
         
        Specified by:
        lookup in interface StrLookup
        Overrides:
        lookup in class MapLookup
        Parameters:
        event - The current LogEvent.
        key - the key to be looked up, may be null
        Returns:
        the matching value, null if no match
      • lookup

        public String lookup​(String key)
        Description copied from class: MapLookup
        Looks up a String key to a String value using the map.

        If the map is null, then null is returned. The map result object is converted to a string using toString().

        Specified by:
        lookup in interface StrLookup
        Overrides:
        lookup in class MapLookup
        Parameters:
        key - the key to be looked up, may be null
        Returns:
        the matching value, null if no match