| Interface | Description | 
|---|---|
| BasicInterpolator | Knows how to do basic interpolation services. | 
| FeedbackEnabledValueSource | Deprecated Rolled into  ValueSourcenow. | 
| InterpolationPostProcessor | Used to allow full recursion of value interpolation before applying some rule
 to the result. | 
| Interpolator | Interpolator interface. | 
| QueryEnabledValueSource | Tracks the most recent expression processed by this value source implementation. | 
| RecursionInterceptor | Logs expressions before resolution is attempted, and clears them
 after resolution is complete (or, fails all strategies). | 
| ValueSource | Supplies one strategy for resolving a value for an interpolation expression. | 
| Class | Description | 
|---|---|
| AbstractDelegatingValueSource | |
| AbstractFunctionValueSourceWrapper | ValueSourceabstract implementation that wraps another value source. | 
| AbstractValueSource | |
| 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). | 
| FixedInterpolatorValueSource | A value source that allows a fixed interpolator to be injected into
 a regular interpolator. | 
| InterpolatorFilterReader | A FilterReader implementation, that works with Interpolator interface instead of it's own interpolation
 implementation. | 
| 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. | 
| PrefixAwareRecursionInterceptor | RecursionInterceptorimplementation that provides support for expressions
 with multiple synonyms, such as project.build.directory == pom.build.directory ==
 build.directory in Maven's POM. | 
| 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 | ValueSourceimplementation 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 | ValueSourceimplementation 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. | 
| RegexBasedInterpolator | Expansion of the original RegexBasedInterpolator, found in plexus-utils, this
 interpolator provides options for setting custom prefix/suffix regex parts,
 and includes a  RecursionInterceptorparameter in its interpolate(..)
 call, to allow the detection of cyclical expression references. | 
| SimpleRecursionInterceptor | Simplest implementation of a  RecursionInterceptor, which checks whether
 the existing interpolation effort is already attempting to resolve an exact
 expression, but has not finished. | 
| SingleResponseValueSource | If the expression matches, simply return the response object. | 
| StringSearchInterpolator | 
| Exception | Description | 
|---|---|
| InterpolationCycleException | |
| InterpolationException | Signals an unrecoverable error in the process of interpolating a string, such
 as the detection of an expression cycle. | 
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