@Plugin(name="map", category="Lookup") public class MapLookup extends Object implements StrLookup
| Constructor and Description |
|---|
MapLookup()
Constructor when used directly as a plugin.
|
MapLookup(Map<String,String> map)
Creates a new instance backed by a Map.
|
| Modifier and Type | Method and Description |
|---|---|
protected Map<String,String> |
getMap() |
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.
|
static void |
setMainArguments(String... args)
Deprecated.
As of 2.4, use
MainMapLookup.setMainArguments(String[]) |
@Deprecated public static void setMainArguments(String... args)
MainMapLookup.setMainArguments(String[])public static main(String[]) method calls this method to make its main arguments
available for lookup with the prefix main.
The map provides two kinds of access: First by index, starting at "0", "1" and so on. For
example, the command line --file path/file.txt -x 2 can be accessed from a configuration file with:
"main:0" = "--file""main:1" = "path/file.txt""main:2" = "-x""main:3" = "2"Second using the argument at position n as the key to access the value at n+1.
"main:--file" = "path/file.txt""main:-x" = "2"args - An application's public static main(String[]) arguments.public String lookup(LogEvent event, String key)
StrLookupThe 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"));
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