Package org.apache.logging.log4j.core.lookup

Class Log4jLookup

    • Field Detail

      • KEY_CONFIG_LOCATION

        public static final java.lang.String KEY_CONFIG_LOCATION
        See Also:
        Constant Field Values

      • KEY_CONFIG_PARENT_LOCATION

        public static final java.lang.String KEY_CONFIG_PARENT_LOCATION
        See Also:
        Constant Field Values

      • LOGGER

        private static final Logger LOGGER

    • Constructor Detail

      • Log4jLookup

        public Log4jLookup()

    • Method Detail

      • asPath

        private static java.lang.String asPath​(java.net.URI uri)

      • getParent

        private static java.net.URI getParent​(java.net.URI uri)
                               throws java.net.URISyntaxException
        Throws:
        java.net.URISyntaxException

      • lookup

        public java.lang.String lookup​(LogEvent event,
                               java.lang.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"));
        Parameters:
        event - The current LogEvent.
        key - the key to be looked up, may be null
        Returns:
        the matching value, null if no match