Package org.apache.logging.log4j.web
Class WebLookup
- java.lang.Object
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- org.apache.logging.log4j.core.lookup.AbstractLookup
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- org.apache.logging.log4j.web.WebLookup
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- All Implemented Interfaces:
StrLookup
@Plugin(name="web", category="Lookup") public class WebLookup extends AbstractLookup
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Field Summary
Fields Modifier and Type Field Description private static java.lang.String
ATTR_PREFIX
private static java.lang.String
INIT_PARAM_PREFIX
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Constructor Summary
Constructors Constructor Description WebLookup()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
lookup(LogEvent event, java.lang.String key)
Looks up a String key to a String value possibly using the current LogEvent.-
Methods inherited from class org.apache.logging.log4j.core.lookup.AbstractLookup
evaluate, lookup
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Field Detail
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ATTR_PREFIX
private static final java.lang.String ATTR_PREFIX
- See Also:
- Constant Field Values
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INIT_PARAM_PREFIX
private static final java.lang.String INIT_PARAM_PREFIX
- See Also:
- Constant Field Values
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Method Detail
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lookup
public java.lang.String lookup(LogEvent event, java.lang.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"));
- Parameters:
event
- The current LogEvent.key
- the key to be looked up, may be null- Returns:
- the matching value, null if no match
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