@Plugin(name="log4j", category="Lookup") public class Log4jLookup extends AbstractConfigurationAwareLookup
|Modifier and Type||Field and Description|
|Constructor and Description|
|Modifier and Type||Method and Description|
Looks up a String key to a String value possibly using the current LogEvent.
public static final String KEY_CONFIG_LOCATION
public static final String KEY_CONFIG_PARENT_LOCATION
public String lookup(LogEvent event, String key)
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"));
event- The current LogEvent.
key- the key to be looked up, may be null
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