SystemPropertiesLookup (Apache Log4j 2 2.17.1 API)

java.lang.Object
- org.apache.logging.log4j.core.lookup.AbstractLookup
- - org.apache.logging.log4j.core.lookup.SystemPropertiesLookup

All Implemented Interfaces:: StrLookup

@Plugin(name="sys",
        category="Lookup")
public class SystemPropertiesLookup
extends AbstractLookup

Looks up keys from system properties.

Field Summary
- Fields inherited from interface org.apache.logging.log4j.core.lookup.StrLookup
  CATEGORY

Constructor Summary

Constructors
Constructor Description

SystemPropertiesLookup()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`lookup(LogEvent event, String key)`	Looks up the value for the key using the data in the LogEvent.

Methods inherited from class org.apache.logging.log4j.core.lookup.AbstractLookup
lookup

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SystemPropertiesLookup
```
public SystemPropertiesLookup()
```
- Method Detail
  - lookup
```
public String lookup(LogEvent event,
                     String key)
```
    Looks up the value for the key using the data in the LogEvent.
    
    Parameters:
    
    event - The current LogEvent.
    
    key - the key to be looked up, may be null
    
    Returns:
    
    The value associated with the key.