Interface TypeConverter

All Known Subinterfaces:

BeanWrapper, ConfigurablePropertyAccessor

All Known Implementing Classes:

AbstractNestablePropertyAccessor, AbstractPropertyAccessor, BeanWrapperImpl, DataBinder, DirectFieldAccessor, ExtendedServletRequestDataBinder, ExtendedWebExchangeDataBinder, ServletRequestDataBinder, SimpleTypeConverter, TypeConverterSupport, WebDataBinder, WebExchangeDataBinder, WebRequestDataBinder

public interface TypeConverter

Interface that defines type conversion methods. Typically (but not necessarily) implemented in conjunction with the PropertyEditorRegistry interface.

Note: Since TypeConverter implementations are typically based on PropertyEditors which aren't thread-safe, TypeConverters themselves are not to be considered as thread-safe either.

Since:

2.0

Author:

Juergen Hoeller

See Also:

• SimpleTypeConverter
• BeanWrapperImpl

Method Summary

Modifier and Type	Method	Description
<T> @nullable T	convertIfNecessary(@nullable Object value, @nullable Class<T> requiredType)	Convert the value to the required type (if necessary from a String).
<T> @nullable T	convertIfNecessary(@nullable Object value, @nullable Class<T> requiredType, @nullable Field field)	Convert the value to the required type (if necessary from a String).
<T> @nullable T	convertIfNecessary(@nullable Object value, @nullable Class<T> requiredType, @nullable MethodParameter methodParam)	Convert the value to the required type (if necessary from a String).
default <T> @nullable T	convertIfNecessary(@nullable Object value, @nullable Class<T> requiredType, @nullable TypeDescriptor typeDescriptor)	Convert the value to the required type (if necessary from a String).

Method Details

convertIfNecessary

<T> @nullable T convertIfNecessary(@nullable Object value,
 @nullable Class<T> requiredType)
                            throws TypeMismatchException

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

See Also:

• PropertyEditor.setAsText(String)
• PropertyEditor.getValue()
• ConversionService
• Converter

convertIfNecessary

<T> @nullable T convertIfNecessary(@nullable Object value,
 @nullable Class<T> requiredType,
 @nullable MethodParameter methodParam)
                            throws TypeMismatchException

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

methodParam - the method parameter that is the target of the conversion (for analysis of generic types; may be null)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

See Also:

• PropertyEditor.setAsText(String)
• PropertyEditor.getValue()
• ConversionService
• Converter

convertIfNecessary

<T> @nullable T convertIfNecessary(@nullable Object value,
 @nullable Class<T> requiredType,
 @nullable Field field)
                            throws TypeMismatchException

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

field - the reflective field that is the target of the conversion (for analysis of generic types; may be null)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

See Also:

• PropertyEditor.setAsText(String)
• PropertyEditor.getValue()
• ConversionService
• Converter

convertIfNecessary

default <T> @nullable T convertIfNecessary(@nullable Object value,
 @nullable Class<T> requiredType,
 @nullable TypeDescriptor typeDescriptor)
                                    throws TypeMismatchException

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class, or a Spring Converter in a ConversionService.

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

typeDescriptor - the type descriptor to use (may be null))

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

Since:

5.1.4

See Also:

• PropertyEditor.setAsText(String)
• PropertyEditor.getValue()
• ConversionService
• Converter