Class ExistsRule

  • All Implemented Interfaces:
    java.io.Serializable, Rule

    public class ExistsRule
    extends AbstractRule
    A Rule class implementing a not null (and not empty string) check.
    See Also:
    Serialized Form
    • Field Detail

      • field

        private final java.lang.String field
        field name.
    • Constructor Detail

      • ExistsRule

        private ExistsRule​(java.lang.String fld)
        Create new instance.
        Parameters:
        fld - field name.
    • Method Detail

      • getRule

        public static Rule getRule​(java.lang.String field)
        Get an instance of ExistsRule.
        Parameters:
        field - field.
        Returns:
        instance of ExistsRule.
      • getRule

        public static Rule getRule​(java.util.Stack stack)
        Create an instance of ExistsRule using the top name on the stack.
        Parameters:
        stack - stack
        Returns:
        instance of ExistsRule.
      • evaluate

        public boolean evaluate​(org.apache.log4j.spi.LoggingEvent event,
                                java.util.Map matches)
        Returns true if this implementation of the rule accepts the LoggingEvent, or false if not.

        What True/False means can be client-specific.

        Parameters:
        event - LoggingEvent this instance will evaluate
        matches - a Map of event field keys to Sets of matching strings (may be null) which will be updated during execution of this method to include field and string matches based on the rule evaluation results
        Returns:
        true if this Rule instance accepts the event, otherwise false.