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TypeConverter (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.beans
Interface TypeConverter

All Known Subinterfaces:

BeanWrapper

All Known Implementing Classes:

BeanWrapperImpl, SimpleTypeConverter

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public interface TypeConverter

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

Since:

2.0

Author:

Juergen Hoeller

See Also:

PropertyEditorRegistry, SimpleTypeConverter, BeanWrapperImpl

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Method Summary
Object	convertIfNecessary(Object value, Class requiredType)           Convert the value to the required type (if necessary from a String).
Object	convertIfNecessary(Object value, Class requiredType, MethodParameter methodParam)           Convert the value to the required type (if necessary from a String).

 

Method Detail

convertIfNecessary

Object convertIfNecessary(Object value,
                          Class 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. Note that a PropertyEditor must be registered for the given class for this to work; this is a standard JavaBeans API. A number of PropertyEditors are automatically registered.

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()

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convertIfNecessary

Object convertIfNecessary(Object value,
                          Class requiredType,
                          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. Note that a PropertyEditor must be registered for the given class for this to work; this is a standard JavaBeans API. A number of PropertyEditors are automatically registered.

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()

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