org.apache.logging.log4j.core.lookup
Class Interpolator

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

All Implemented Interfaces:

StrLookup

public class Interpolator
extends Object
implements StrLookup

The Interpolator is a StrLookup that acts as a proxy for all the other StrLookups.

Constructor Summary

Interpolator()

Interpolator(StrLookup defaultLookup)

Method Summary

String	lookup(LogEvent event, String var) Resolves the specified variable.
String	lookup(String var) Resolves the specified variable.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Interpolator

public Interpolator(StrLookup defaultLookup)

Interpolator

public Interpolator()

Method Detail

lookup

public String lookup(String var)

Resolves the specified variable. This implementation will try to extract a variable prefix from the given variable name (the first colon (':') is used as prefix separator). It then passes the name of the variable with the prefix stripped to the lookup object registered for this prefix. If no prefix can be found or if the associated lookup object cannot resolve this variable, the default lookup object will be used.

Specified by:

lookup in interface StrLookup

Parameters:

var - the name of the variable whose value is to be looked up

Returns:

the value of this variable or null if it cannot be resolved

lookup

public String lookup(LogEvent event,
                     String var)

Resolves the specified variable. This implementation will try to extract a variable prefix from the given variable name (the first colon (':') is used as prefix separator). It then passes the name of the variable with the prefix stripped to the lookup object registered for this prefix. If no prefix can be found or if the associated lookup object cannot resolve this variable, the default lookup object will be used.

Specified by:

lookup in interface StrLookup

Parameters:

event - The current LogEvent or null.

var - the name of the variable whose value is to be looked up

Returns:

the value of this variable or null if it cannot be resolved

toString

public String toString()

Overrides:

toString in class Object