|Constructor and Description|
Constructor when used directly as a plugin.
Creates a new instance backed by a Map.
|Modifier and Type||Method and Description|
Looks up a String key to a String value possibly using the current LogEvent.
Looks up a String key to a String value using the map.
map- the map of keys to values, may be null
If the map is null, then null is returned. The map result object is converted to a string using toString().
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.
StrLookup.lookup(String) method always returns a String, regardless of
the underlying data, by converting it as necessary. For example:
map = new HashMap (); map.put("number", new Integer(2)); assertEquals("2", StrLookup.mapLookup(map).lookup("number"));
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