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java.lang.Objectorg.apache.logging.log4j.core.lookup.MapLookup
@Plugin(name="map", category="Lookup") public class MapLookup
The basis for a lookup based on a Map.
Constructor Summary | |
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MapLookup()
Constructor when used directly as a plugin. |
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MapLookup(Map<String,String> map)
Creates a new instance backed by a Map. |
Method Summary | |
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String |
lookup(LogEvent event,
String key)
Looks up a String key to a String value possibly using the current LogEvent. |
String |
lookup(String key)
Looks up a String key to a String value using the map. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MapLookup(Map<String,String> map)
map
- the map of keys to values, may be nullpublic MapLookup()
Method Detail |
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public String lookup(String key)
If the map is null, then null is returned. The map result object is converted to a string using toString().
lookup
in interface StrLookup
key
- the key to be looked up, may be null
public String lookup(LogEvent event, String key)
StrLookup
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.
The StrLookup.lookup(String)
method always returns a String, regardless of
the underlying data, by converting it as necessary. For example:
Mapmap = new HashMap (); map.put("number", new Integer(2)); assertEquals("2", StrLookup.mapLookup(map).lookup("number"));
lookup
in interface StrLookup
event
- The current LogEvent.key
- the key to be looked up, may be null
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