| Package | Description | 
|---|---|
| org.apache.commons.configuration2.tree | 
 
 A package with helper and utility classes used by hierarchical configurations. 
 | 
| Modifier and Type | Field and Description | 
|---|---|
static DefaultExpressionEngine | 
DefaultExpressionEngine.INSTANCE
A default instance of this class that is used as expression engine for
 hierarchical configurations per default. 
 | 
| Modifier and Type | Method and Description | 
|---|---|
DefaultExpressionEngine | 
DefaultConfigurationKey.getExpressionEngine()
Returns the associated default expression engine. 
 | 
| Constructor and Description | 
|---|
DefaultConfigurationKey(DefaultExpressionEngine engine)
Creates a new instance of  
DefaultConfigurationKey and sets
 the associated expression engine. | 
DefaultConfigurationKey(DefaultExpressionEngine engine,
                       String key)
Creates a new instance of  
DefaultConfigurationKey and sets the
 associated expression engine and an initial key. | 
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