MapRewritePolicy (Apache Chainsaw 2.1.0 API)

java.lang.Object
- org.apache.log4j.rewrite.MapRewritePolicy

All Implemented Interfaces:

RewritePolicy
```
public class MapRewritePolicy
extends Object
implements RewritePolicy
```
This policy rewrites events where the message of the original event implementes java.util.Map. All other events are passed through unmodified. If the map contains a "message" entry, the value will be used as the message for the rewritten event. The rewritten event will have a property set that is the combination of the original property set and the other members of the message map. If both the original property set and the message map contain the same entry, the value from the message map will overwrite the original property set.
The combination of the RewriteAppender and this policy performs the same actions as the MapFilter from log4j 1.3.

Constructor Summary

Constructors
Constructor Description

MapRewritePolicy()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.apache.log4j.spi.LoggingEvent`	`rewrite(org.apache.log4j.spi.LoggingEvent source)`	Rewrite a logging event.

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

- Constructor Detail
  - MapRewritePolicy
```
public MapRewritePolicy()
```
- Method Detail
  - rewrite
```
public org.apache.log4j.spi.LoggingEvent rewrite(org.apache.log4j.spi.LoggingEvent source)
```
    Rewrite a logging event.
    
    Specified by:
    
    rewrite in interface RewritePolicy
    
    Parameters:
    
    source - a logging event that may be returned or used to create a new logging event.
    
    Returns:
    
    a logging event or null to suppress processing.