All Known Subinterfaces:

ClonableFieldHandler, ConfigurableFieldHandler

All Known Implementing Classes:

AbstractFieldHandler, CenturyDescriptor.CenturyFieldHandler, CollectionFieldHandler, ContainerFieldHandler, DateDescriptor.DateFieldHandler, DateFieldHandler, DateTimeDescriptor.DateTimeFieldHandler, DurationDescriptor.DurationFieldHandler, EnumFieldHandler, EnumFieldHandler, ExtendedFieldHandler, ExtendedFieldHandler, FieldHandlerFriend, FieldHandlerImpl, GDayDescriptor.GDayFieldHandler, GeneralizedFieldHandler, GMonthDayDescriptor.GMonthDayFieldHandler, GMonthDescriptor.GMonthFieldHandler, GYearDescriptor.GYearFieldHandler, GYearMonthDescriptor.GYearMonthFieldHandler, MonthDescriptor.MonthFieldHandler, RecurringDurationDescriptor.RecurringDurationFieldHandler, SQLTimeFieldHandler, SQLTimestampFieldHandler, TimeDescriptor.TimeFieldHandler, TimeDurationDescriptor.TimeDurationFieldHandler, TimePeriodDescriptor.TimePeriodFieldHandler, ToStringFieldHandler, TransientFieldHandler, ValueOfFieldHandler, XMLFieldHandler, YearDescriptor.YearFieldHandler
```
public interface FieldHandler
```
A field handler knows how to perform various operations on the field that require access to the field value.

Version:

$Revision: 6671 $ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $

Author:

Assaf Arkin

See Also:

FieldDescriptor

Method Summary

All Methods Instance Methods Abstract Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`checkValidity(java.lang.Object object)`	Deprecated. No longer supported
`java.lang.Object`	`getValue(java.lang.Object object)`	Returns the value of the field from the object.
`java.lang.Object`	`newInstance(java.lang.Object parent)`	Creates a new instance of the object described by this field.
`void`	`resetValue(java.lang.Object object)`	Sets the value of the field to a default value.
`void`	`setValue(java.lang.Object object, java.lang.Object value)`	Sets the value of the field on the object.

- Method Detail
  - getValue
```
java.lang.Object getValue(java.lang.Object object)
                   throws java.lang.IllegalStateException
```
    Returns the value of the field from the object.
    
    Parameters:
    
    object - The object
    
    Returns:
    
    The value of the field
    
    Throws:
    
    java.lang.IllegalStateException - The Java object has changed and is no longer supported by this handler, or the handler is not compatible with the Java object
  - setValue
```
void setValue(java.lang.Object object,
              java.lang.Object value)
       throws java.lang.IllegalStateException,
              java.lang.IllegalArgumentException
```
    Sets the value of the field on the object.
    
    Parameters:
    
    object - The object.
    
    value - The new value.
    
    Throws:
    
    java.lang.IllegalStateException - The Java object has changed and is no longer supported by this handler, or the handler is not compatible with the Java object.
    
    java.lang.IllegalArgumentException - The value passed is not of a supported type.
  - resetValue
```
void resetValue(java.lang.Object object)
         throws java.lang.IllegalStateException,
                java.lang.IllegalArgumentException
```
    Sets the value of the field to a default value.
    Reference fields are set to null, primitive fields are set to their default value, collection fields are emptied of all elements.
    
    Parameters:
    
    object - The object.
    
    Throws:
    
    java.lang.IllegalStateException - The Java object has changed and is no longer supported by this handler, or the handler is not compatible with the Java object.
    
    java.lang.IllegalArgumentException
  - checkValidity
```
void checkValidity(java.lang.Object object)
            throws ValidityException,
                   java.lang.IllegalStateException
```
    Deprecated.
    No longer supported
    
    Throws:
    
    ValidityException
    
    java.lang.IllegalStateException
  - newInstance
```
java.lang.Object newInstance(java.lang.Object parent)
                      throws java.lang.IllegalStateException
```
    Creates a new instance of the object described by this field.
    
    Parameters:
    
    parent - The object for which the field is created
    
    Returns:
    
    A new instance of the field's value
    
    Throws:
    
    java.lang.IllegalStateException - This field is a simple type and cannot be instantiated

Interface FieldHandler

Method Summary

Method Detail

getValue

setValue

resetValue

checkValidity

newInstance