There’s More to Life Than Strings: Working with Data Types - Stripes...and Java Web Development is Fun Again - page 87

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request
name=value

String
"value"

TypeConverter<T> T

setName(T)

ActionBean

Figure 5.1: Type conversion

public interface TypeConverter<T> {
void setLocale(Locale locale);
T convert(String input, Class<? extends T> targetType,
Collection<ValidationError> errors);

}

Stripes gives type converters the user's locale so that the type con-
version can be done in a locale-sensitive manner, if necessary. Then,
Stripes calls the convert ( ) method with the String input parameter from
the request, the action bean property type, and a list of validation
errors. If the type conversion fails, the converter adds an error mes-
sage to the list and returns null . If all goes well, the method returns the
value converted to the T type, and Stripes sets the action bean property
with this value.

Out of the box, Stripes automatically uses built-in type converters for
basic data types:

• byte , Byte , short , Short , int , Integer , long , Long , java.math.BigInteger
• float , Float , double , Double , java.math.BigDecimal
• java.util.Date
• boolean , Boolean
• char , Character
• enum