ValueSource

All Known Subinterfaces:

FeedbackEnabledValueSource, QueryEnabledValueSource

All Known Implementing Classes:

AbstractDelegatingValueSource, AbstractFunctionValueSourceWrapper, AbstractValueSource, EnvarBasedValueSource, FixedInterpolatorValueSource, MapBasedValueSource, ObjectBasedValueSource, PrefixedObjectValueSource, PrefixedPropertiesValueSource, PrefixedValueSourceWrapper, PropertiesBasedValueSource, SingleResponseValueSource
```
public interface ValueSource
```
Supplies one strategy for resolving a value for an interpolation expression. ValueSources may be stacked.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clearFeedback()`	Clear the feedback accumulated by a prior interpolation run.
`java.util.List`	`getFeedback()`	Return the feedback about resolution failures for a particular expression.
`java.lang.Object`	`getValue(java.lang.String expression)`

- Method Detail
  - getValue
```
java.lang.Object getValue(java.lang.String expression)
```
    Parameters:
    
    expression - The string expression.
    
    Returns:
    
    the value related to the expression, or null if not found.
  - getFeedback
```
java.util.List getFeedback()
```
    Return the feedback about resolution failures for a particular expression.
    
    Returns:
    
    a combination of String and Throwable instances, where strings related to throwables are listed first.
  - clearFeedback
```
void clearFeedback()
```
    Clear the feedback accumulated by a prior interpolation run.