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

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

All Implemented Interfaces:
  StrLookup

Direct Known Subclasses:
  EnvironmentLookup, Interpolator, JavaLookup, JndiLookup, ResourceBundleLookup, SystemPropertiesLookup

    public abstract class AbstractLookup

extends Object
implements StrLookup

A default lookup for others to extend.

Since:
  2.1

Field Summary

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

Constructor Summary
`AbstractLookup()`

Method Summary
`String` | `lookup(String key)` Calls `lookup(null, key);`

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

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

Constructor Detail

### AbstractLookup

    public AbstractLookup()

Method Detail

### lookup

    public String lookup(String key)

  Calls `lookup(null, key);`

  Specified by:
    `lookup` in interface `StrLookup`
  Parameters:
    `key` - the key to be looked up, may be null
  Returns:
    the matching value, null if no match
  See Also:
    `StrLookup.lookup(LogEvent, String)`

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