Package org.springframework.expression
Interface TypeConverter
- All Known Implementing Classes:
StandardTypeConverter
public interface TypeConverter
A type converter can convert values between different types encountered during
expression evaluation. This is an SPI for the expression parser; see
ConversionService for the primary
user API to Spring's conversion facilities.- Since:
- 3.0
- Author:
- Andy Clement, Juergen Hoeller
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Method Summary
Modifier and TypeMethodDescriptionbooleancanConvert(TypeDescriptor sourceType, TypeDescriptor targetType) Returntrueif the type converter can convert the specified type to the desired target type.convertValue(Object value, TypeDescriptor sourceType, TypeDescriptor targetType) Convert (or coerce) a value from one type to another, for example from abooleanto aString.
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Method Details
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canConvert
Returntrueif the type converter can convert the specified type to the desired target type.- Parameters:
sourceType- a type descriptor that describes the source typetargetType- a type descriptor that describes the requested result type- Returns:
trueif that conversion can be performed
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convertValue
@Nullable Object convertValue(@Nullable Object value, @Nullable TypeDescriptor sourceType, TypeDescriptor targetType) Convert (or coerce) a value from one type to another, for example from abooleanto aString.The
TypeDescriptorparameters enable support for typed collections: A caller may prefer aList<Integer>, for example, rather than simply anyList.- Parameters:
value- the value to be convertedsourceType- a type descriptor that supplies extra information about the source objecttargetType- a type descriptor that supplies extra information about the requested result type- Returns:
- the converted value
- Throws:
EvaluationException- if conversion failed or is not possible to begin with
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