Package org.codehaus.plexus.interpolation

Interface ValueSource

All Known Subinterfaces:

FeedbackEnabledValueSource, QueryEnabledValueSource

All Known Implementing Classes:

AbstractDelegatingValueSource, AbstractFunctionValueSourceWrapper, AbstractValueSource, EnvarBasedValueSource, FeedbackingValueSource, 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

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)
default java.lang.Object	getValue(java.lang.String expression, java.lang.String expressionStartDelimiter, java.lang.String expressionEndDelimiter)	Returns a value resolved from an expression.

Method Detail

getValue

default java.lang.Object getValue(java.lang.String expression,
                                  java.lang.String expressionStartDelimiter,
                                  java.lang.String expressionEndDelimiter)

Returns a value resolved from an expression. The return value is recursively resolved via BasicInterpolator.interpolate(String), i.e. might contain expressions as well.

Parameters:

expression - The string expression.

expressionStartDelimiter - A valid start delimiter of the expression to be used with the calling Interpolator (by default ${).

expressionEndDelimiter - A valid end delimiter of the expression to be used with the calling Interpolator (by default }).

Returns:

the value related to the expression, or null if not found. This value might contain other expressions separated by expressionStartDelimiter and expressionEndDelimiter

Since:

1.28

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.

See Also:

getValue(String, String, String)

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.