ContextMapLookup

java.lang.Object
- org.apache.logging.log4j.core.lookup.ContextMapLookup

All Implemented Interfaces:

StrLookup
```
@Plugin(name="ctx",
        category="Lookup")
public class ContextMapLookup
extends java.lang.Object
implements StrLookup
```
Looks up keys from the context. By default this is the ThreadContext, but users may configure a custom ContextDataInjector which obtains context data from some other source.

Field Summary

Fields
Modifier and Type Field Description

private ContextDataInjector injector
- Fields inherited from interface org.apache.logging.log4j.core.lookup.StrLookup
  CATEGORY

Constructor Summary

Constructors
Constructor Description

ContextMapLookup()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private ReadOnlyStringMap`	`currentContextData()`
`java.lang.String`	`lookup(java.lang.String key)`	Looks up the value from the ThreadContext Map.
`java.lang.String`	`lookup(LogEvent event, java.lang.String key)`	Looks up the value from the ThreadContext Map.

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
evaluate, evaluate

- Field Detail
  - injector
```
private final ContextDataInjector injector
```
- Constructor Detail
  - ContextMapLookup
```
public ContextMapLookup()
```
- Method Detail
  - lookup
```
public java.lang.String lookup(java.lang.String key)
```
    Looks up the value from the ThreadContext Map.
    
    Specified by:
    
    lookup in interface StrLookup
    
    Parameters:
    
    key - the key to be looked up, may be null
    
    Returns:
    
    The value associated with the key.
  - currentContextData
```
private ReadOnlyStringMap currentContextData()
```
  - lookup
```
public java.lang.String lookup(LogEvent event,
                               java.lang.String key)
```
    Looks up the value from the ThreadContext Map.
    
    Specified by:
    
    lookup in interface StrLookup
    
    Parameters:
    
    event - The current LogEvent.
    
    key - the key to be looked up, may be null
    
    Returns:
    
    The value associated with the key.