Class Interpolator

    • Field Detail

      • PREFIX_SEPARATOR

        public static final char PREFIX_SEPARATOR
        Constant for the prefix separator.
        See Also:
        Constant Field Values
    • Constructor Detail

      • Interpolator

        public Interpolator​(StrLookup defaultLookup)
      • Interpolator

        public Interpolator​(StrLookup defaultLookup,
                            List<String> pluginPackages)
        Constructs an Interpolator using a given StrLookup and a list of packages to find Lookup plugins in.
        Parameters:
        defaultLookup - the default StrLookup to use as a fallback
        pluginPackages - a list of packages to scan for Lookup plugins
        Since:
        2.1
      • Interpolator

        public Interpolator()
        Create the default Interpolator.
      • Interpolator

        public Interpolator​(Map<String,​String> properties)
        Creates the default Interpolator with the provided properties.
    • Method Detail

      • getDefaultLookup

        public StrLookup getDefaultLookup()
      • lookup

        public String lookup​(LogEvent event,
                             String var)
        Resolves the specified variable. This implementation will try to extract a variable prefix from the given variable name (the first colon (':') is used as prefix separator). It then passes the name of the variable with the prefix stripped to the lookup object registered for this prefix. If no prefix can be found or if the associated lookup object cannot resolve this variable, the default lookup object will be used.
        Parameters:
        event - The current LogEvent or null.
        var - the name of the variable whose value is to be looked up
        Returns:
        the value of this variable or null if it cannot be resolved
      • evaluate

        public LookupResult evaluate​(LogEvent event,
                                     String var)
        Resolves the specified variable. This implementation will try to extract a variable prefix from the given variable name (the first colon (':') is used as prefix separator). It then passes the name of the variable with the prefix stripped to the lookup object registered for this prefix. If no prefix can be found or if the associated lookup object cannot resolve this variable, the default lookup object will be used.
        Parameters:
        event - The current LogEvent or null.
        var - the name of the variable whose value is to be looked up
        Returns:
        the value of this variable or null if it cannot be resolved