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## org.apache.logging.log4j.core.lookup
Class SystemPropertiesLookup

    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
`SystemPropertiesLookup()`

Method Summary
`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.

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