| Interface | Description | 
|---|---|
| FixedValueSource | 
| Class | Description | 
|---|---|
| AbstractDelegatingValueSource | |
| EnvarBasedValueSource | ValueSourcewhich resolves expressions against the environment variables
 available from the underlying operating system (and possibly, the shell environment
 that created the present Java process). | 
| FixedStringSearchInterpolator | A fixed string search interpolator is permanently bound to a given set of value sources,
 an is totally fixed and stateless over these value sources. | 
| InterpolationState | AN error collector contains the errors accumulated during an interpolation. | 
| MapBasedValueSource | Wraps a Map, and looks up the whole expression as a single key, returning the
 value mapped to it. | 
| ObjectBasedValueSource | Wraps an object, providing reflective access to the object graph of which the
 supplied object is the root. | 
| PrefixedObjectValueSource | Wraps an arbitrary object with an  ObjectBasedValueSourceinstance, then
 wraps that source with aPrefixedValueSourceWrapperinstance, to which
 this class delegates all of its calls. | 
| PrefixedPropertiesValueSource | Legacy support. | 
| PrefixedValueSourceWrapper | FixedValueSourceimplementation which simply wraps another
 value source, and trims any of a set of possible expression prefixes before delegating the
 modified expression to be resolved by the real value source. | 
| PropertiesBasedValueSource | FixedValueSourceimplementation that wraps aPropertiesinstance,
 and does a simple lookup of the entire expression string as the parameter forProperties.getProperty(String), returning the result as the resolved
 value. | 
| Exception | Description | 
|---|---|
| InterpolationCycleException | 
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