org.exolab.castor.xml
Class XMLFieldHandler

java.lang.Object
  org.exolab.castor.mapping.loader.FieldHandlerFriend
      org.exolab.castor.mapping.ExtendedFieldHandler
          org.exolab.castor.mapping.AbstractFieldHandler
              org.exolab.castor.xml.XMLFieldHandler

All Implemented Interfaces:

FieldHandler

public class XMLFieldHandler

extends AbstractFieldHandler

This FieldHandler is used in the generated descriptors.

A field handler knows how to perform various operations on the field that require access to the field value.

Version:

$Revision: 1.3 $ $Date: 2003/09/23 21:16:41 $

Author:

Assaf Arkin, Keith Visco

See Also:

FieldDescriptor

Constructor Summary

XMLFieldHandler()
Creates a new default XMLFieldHandler

Method Summary

boolean	equals(java.lang.Object obj) Returns true if the given object is an XMLFieldHandler that is equivalent to this one.
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.
java.lang.Object	newInstance(java.lang.Object parent, java.lang.Object[] args) 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.

Methods inherited from class org.exolab.castor.mapping.AbstractFieldHandler

hasValue

Methods inherited from class org.exolab.castor.mapping.ExtendedFieldHandler

checkValidity

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XMLFieldHandler

public XMLFieldHandler()

Creates a new default XMLFieldHandler

Method Detail

equals

public boolean equals(java.lang.Object obj)

Returns true if the given object is an XMLFieldHandler that is equivalent to this one. An equivalent XMLFieldHandler is an XMLFieldHandler that is an instances of the same class. This method can be overwritten to provide more advanced equivalence tests.

Returns:

true if the given object is an XMLFieldHandler that is equivalent to this one.

getValue

public java.lang.Object getValue(java.lang.Object object)
                          throws java.lang.IllegalStateException

Returns the value of the field from the object.

Specified by:

getValue in interface FieldHandler

Specified by:

getValue in class AbstractFieldHandler

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 compatiable with the Java object

newInstance

public java.lang.Object newInstance(java.lang.Object parent)
                             throws java.lang.IllegalStateException

Creates a new instance of the object described by this field.

Specified by:

newInstance in interface FieldHandler

Specified by:

newInstance in class AbstractFieldHandler

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

newInstance

public java.lang.Object newInstance(java.lang.Object parent,
                                    java.lang.Object[] args)
                             throws java.lang.IllegalStateException

Creates a new instance of the object described by this field.

Specified by:

newInstance in class AbstractFieldHandler

Parameters:

parent - The object for which the field is created

args - the set of constructor arguments

Returns:

A new instance of the field's value

Throws:

java.lang.IllegalStateException - This field is a simple type and cannot be instantiated

setValue

public 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.

Specified by:

setValue in interface FieldHandler

Specified by:

setValue in class AbstractFieldHandler

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 compatiable with the Java object

java.lang.IllegalArgumentException

resetValue

public void resetValue(java.lang.Object object)
                throws java.lang.IllegalStateException,
                       java.lang.IllegalArgumentException

Description copied from class: AbstractFieldHandler

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.

Specified by:

resetValue in interface FieldHandler

Specified by:

resetValue in class AbstractFieldHandler

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 compatiable with the Java object

java.lang.IllegalArgumentException