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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.woody.datatype 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.apache.cocoon.woody.datatype.Datatype

All known Subclasses:   org.apache.cocoon.woody.datatype.typeimpl.AbstractDatatype,
Datatype
public interface Datatype (Code)
A Datatype encapsulates the functionality for working with specific kinds of data like integers, deciamals or dates.

I provides:

  • Methods for converting between String and Object representation of the data
  • For validating the data (usually against a set of validation rules)
  • optionally a selection list

Each datatype can be marked as an "arraytype". Currently, this only has an influence on the Datatype.validate(Object,ExpressionContext) method, which should in that case be passed an array of objects. See also Datatype.isArrayType() .
version:
   $Id: Datatype.java 433543 2006-08-22 06:22:54Z crossley $





Method Summary
 ObjectconvertFromString(String value, Locale locale)
     Converts a string to an object of this datatype.
 StringconvertToString(Object value, Locale locale)
     Converts an object of this datatype to a string representation.
 DatatypeBuildergetBuilder()
     Returns the factory that built this datatype.
 ConvertorgetConvertor()
     Returns the convertor used by this datatype.
 StringgetDescriptiveName()
     Returns a descriptive name for the base type of this datatype, i.e.
 ConvertorgetPlainConvertor()
     Returns the "plain convertor".
 ClassgetTypeClass()
     Gets the class object for the type represented by this datatype.
 booleanisArrayType()
     Indicates wether this datatype represents an array type.
 ValidationErrorvalidate(Object value, ExpressionContext expressionContext)
     Returns null if validation is successful, otherwise returns a ValidationError instance.



Method Detail
convertFromString
Object convertFromString(String value, Locale locale)(Code)
Converts a string to an object of this datatype. Returns null if this fails. This method uses the same Convertor as returned by the Datatype.getConvertor() method.



convertToString
String convertToString(Object value, Locale locale)(Code)
Converts an object of this datatype to a string representation. This method uses the same Convertor as returned by the Datatype.getConvertor() method.



getBuilder
DatatypeBuilder getBuilder()(Code)
Returns the factory that built this datatype.



getConvertor
Convertor getConvertor()(Code)
Returns the convertor used by this datatype.



getDescriptiveName
String getDescriptiveName()(Code)
Returns a descriptive name for the base type of this datatype, i.e. something like 'string', 'long', 'decimal', ...



getPlainConvertor
Convertor getPlainConvertor()(Code)
Returns the "plain convertor". This is convertor that should have a locale-independent string encoding, and guarantees perfect roundtripping. It is used if a value of this datatype needs to be stored but not displayed to the user.



getTypeClass
Class getTypeClass()(Code)
Gets the class object for the type represented by this datatype. E.g. Long, String, ... The objects returned from the convertFromString* methods are of this type, and the object passed to the convertToString* or validate methods should be of this type.



isArrayType
boolean isArrayType()(Code)
Indicates wether this datatype represents an array type. This approach has been chosen instead of creating a seperate ArrayDatatype interface (and corresponding implementations), since almost all functionality is the same between the scalar and array types. The main difference is that the validate() method will be passed arrays instead of single values, and hence different validation rules will be required.



validate
ValidationError validate(Object value, ExpressionContext expressionContext)(Code)
Returns null if validation is successful, otherwise returns a ValidationError instance.
Parameters:
  value - an Object of the correct type for this datatype (seeDatatype.getTypeClass(), or if Datatype.isArrayType()returns true, an array of objects of that type.



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