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

    java.lang.Object
      org.apache.logging.log4j.core.lookup.AbstractLookup
          org.apache.logging.log4j.core.lookup.EnvironmentLookup

All Implemented Interfaces:
  StrLookup

    @Plugin(name="env",
            category="Lookup")
    public class EnvironmentLookup

extends AbstractLookup

Looks up keys from environment variables.

Field Summary

Fields inherited from interface org.apache.logging.log4j.core.lookup.StrLookup
`CATEGORY`

Constructor Summary
`EnvironmentLookup()`

Method Summary
`String` | `lookup(LogEvent event, String key)` Looks up the value of the environment variable.

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

### EnvironmentLookup

    public EnvironmentLookup()

Method Detail

### lookup

    public String lookup(LogEvent event,
                         String key)

  Looks up the value of the environment variable.

  Parameters:
    `event` - The current LogEvent (is ignored by this StrLookup).
    `key` - the key to be looked up, may be null
  Returns:
    The value of the environment variable.

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