Class PropertiesLookup
- java.lang.Object
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- org.apache.logging.log4j.core.lookup.PropertiesLookup
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- All Implemented Interfaces:
StrLookup
public final class PropertiesLookup extends Object implements StrLookup
A lookup designed forProperties
defined in the configuration. This is similar toMapLookup
without special handling for structured messages. Note that this lookup is not a plugin, but wired as a default lookup in the configuration.
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Constructor Summary
Constructors Constructor Description PropertiesLookup(Map<String,String> properties)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description String
lookup(String key)
Looks a value from configuration properties.String
lookup(LogEvent event, String key)
Looks up a String key to a String value possibly using the current LogEvent.String
toString()
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Method Detail
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lookup
public String lookup(LogEvent event, String key)
Description copied from interface:StrLookup
Looks up a String key to a String value possibly using the current LogEvent.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"));
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lookup
public String lookup(String key)
Looks a value from configuration properties.If the property is not defined, then null is returned.
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