Java Doc for ValidationTracker.java in  » Library » Tapestry » org » apache » tapestry » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.apache.tapestry.ValidationTracker

All known Subclasses:   org.apache.tapestry.ValidationTrackerImpl,
ValidationTracker
public interface ValidationTracker (Code)
Tracks information related to user input validations. This information is:
  • The input values provided by the user.
  • Any validation exceptions associated with input fields.

The tracker must differentiate between components (which will implement the Field interfaces) and fields. It is a one to many relationship, because each field may be called upon to render itself multiple times within a request, because of Loop or other similar components.

Internally, the tracker indexes its information in terms of the Field.getElementName for each rendering of the component (the mechanics of Tapestry ensures that this is unique within the form).

Validation trackers must be serializable, as they will almost always be stored into the HttpSession.

Trackers are used by only a single form within a single page; they are not threadsafe.





Method Summary
 voidclear()
     Clears all information stored by the tracker.
 StringgetError(Field field)
     Returns a previously recorded error message.
 List<String>getErrors()
     Returns a list of all error messages.
 booleangetHasErrors()
     Returns true if any field contains an error.
 StringgetInput(Field field)
     Returns a previously recorded input value.
 booleaninError(Field field)
     For a given field, determines if the field is "in error", meaning that an error message has been previously recorded for the field.
 voidrecordError(Field field, String errorMessage)
     Records an error message for a field.
 voidrecordError(String errorMessage)
     Records an error message that is not associated with any specific field.
 voidrecordInput(Field field, String input)
     Called by a field to record the exact input from the user, prior to any validation.



Method Detail
clear
void clear()(Code)
Clears all information stored by the tracker.



getError
String getError(Field field)(Code)
Returns a previously recorded error message.



getErrors
List<String> getErrors()(Code)
Returns a list of all error messages. The messages are stored in the order that they were added to the tracker, except that unassociated errors (unassociated with any field) are listed first.



getHasErrors
boolean getHasErrors()(Code)
Returns true if any field contains an error.



getInput
String getInput(Field field)(Code)
Returns a previously recorded input value.



inError
boolean inError(Field field)(Code)
For a given field, determines if the field is "in error", meaning that an error message has been previously recorded for the field.
Parameters:
  field - true if an error message is present



recordError
void recordError(Field field, String errorMessage)(Code)
Records an error message for a field. The error message is primarily derived from a ValidationException thrown by a Validator or Translator .
Parameters:
  field -
Parameters:
  errorMessage -



recordError
void recordError(String errorMessage)(Code)
Records an error message that is not associated with any specific field. This often reflects some amount of cross-form validation.
Parameters:
  errorMessage -



recordInput
void recordInput(Field field, String input)(Code)
Called by a field to record the exact input from the user, prior to any validation. If the form is redisplayed (to present errors), the input value will be sent back to the user for correction.
Parameters:
  field - the field recording the input
Parameters:
  input - the value obtained from the forms submission



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