Class StrutsTypeConverter

All Implemented Interfaces:
TypeConverter

public abstract class StrutsTypeConverter extends DefaultTypeConverter

Base class for type converters used in Struts. This class provides two abstract methods that are used to convert both to and from strings -- the critical functionality that is core to Struts's type conversion system.

Type converters do not have to use this class. It is merely a helper base class, although it is recommended that you use this class as it provides the common type conversion contract required for all web-based type conversion.

There's a hook (fall back method) called performFallbackConversion of which could be used to perform some fallback conversion if convertValue method of this failed. By default it just ask its super class (Ognl's DefaultTypeConverter) to do the conversion.

To allow the framework to recognize that a conversion error has occurred, throw an StrutsException or preferable a TypeConversionException.

  • Constructor Details

    • StrutsTypeConverter

      public StrutsTypeConverter()
  • Method Details

    • convertValue

      public Object convertValue(Map context, Object o, Class toClass)
      Overrides:
      convertValue in class DefaultTypeConverter
    • performFallbackConversion

      protected Object performFallbackConversion(Map context, Object o, Class toClass)
      Hook to perform a fallback conversion if every default options failed. By default this will ask Ognl's DefaultTypeConverter (of which this class extends) to perform the conversion.
      Parameters:
      context - the action context
      o - object to be converted
      toClass - the class to convert to
      Returns:
      The fallback conversion
    • convertFromString

      public abstract Object convertFromString(Map context, String[] values, Class toClass)
      Converts one or more String values to the specified class.
      Parameters:
      context - the action context
      values - the String values to be converted, such as those submitted from an HTML form
      toClass - the class to convert to
      Returns:
      the converted object
    • convertToString

      public abstract String convertToString(Map context, Object o)
      Converts the specified object to a String.
      Parameters:
      context - the action context
      o - the object to be converted
      Returns:
      the converted String