public final class PropertiesLookup extends Object implements StrLookup
Properties
defined in the configuration. This is similar
to MapLookup
without special handling for structured messages.
Note that this lookup is not a plugin, but wired as a default lookup in the configuration.Constructor and Description |
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PropertiesLookup(Map<String,String> properties) |
Modifier and Type | Method and Description |
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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 a value from configuration properties.
|
String |
toString() |
public PropertiesLookup(Map<String,String> properties)
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.
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"));
public String lookup(String key)
If the property is not defined, then null is returned.
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