velosurf.validation
Class NotNull

java.lang.Object
  velosurf.validation.FieldConstraint
      velosurf.validation.NotNull

public class NotNull
extends FieldConstraint

A "not null" constraint. Syntax is:

    <column not-null="true"/>
  

Or:

   <column>
     <not-null [message="error-message"]/>
   </column>

To validate data coming from an HTML form, you should rather use the not-empty constraint since there cannot be any null value.

Note: this constraint is not meant to replace an internal SQL "not-null" clause in the database, since it cannot be made sure that complex updates will respect this constraint.

Author:

Claude Brisson

Constructor Summary

NotNull()
Default constructor.

Method Summary

java.lang.String	toString() return a string representation for this constraint.
boolean	validate(java.lang.Object data) Validate datea against this constraint.

Methods inherited from class velosurf.validation.FieldConstraint

getMessage, setMessage, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NotNull

public NotNull()

Default constructor.

Method Detail

validate

public boolean validate(java.lang.Object data)

Validate datea against this constraint.

Overrides:

validate in class FieldConstraint

Parameters:

data - the data to be validated

Returns:

true if data is not null

toString

public java.lang.String toString()

return a string representation for this constraint.

Overrides:

toString in class java.lang.Object

Returns:

string