oracle.toplink.ox
Class XMLField

java.lang.Object
  oracle.toplink.internal.helper.DatabaseField
      oracle.toplink.ox.XMLField

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

XMLUnionField

public class XMLField
extends DatabaseField

TopLink XML mappings make use of XMLFields based on XPath statements to find the relevant data in an XML document. The XPath statement is relative to the context node specified in the descriptor. The XPath may contain node type, path, and positional information. The XPath is specified on the field using the setXPath method or by using the appropriate constructor.

The following XPath statements may be used to specify the location of XML data relating to an object's name attribute:

XPath	Description
@name	The "@" character indicates that the node is an attribute.
text()	"text()" indicates that the node is a text node. In this case the name value in the text node belongs to the context node.
full-name/text()	The name information is stored in the text node of the full-name element.
personal-info/name/text()	The XPath statement may be used to specify any valid path.
name[2]/text()	The XPath statement may contain positional information. In this case the name information is stored in the text node of the second occurrence of the name element.

Mapping to a Specific Schema Type: In most cases TopLink can determine the target format in the XML document. However, there are cases where you must specify which one of a number of possible targets TopLink should use. For example, a java.util.Calendar could be marshalled to a schema date, time, or dateTime, or a byte[] could be marshalled to a schema hexBinary or base64Binary node.

XML Schema
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="customer" type="customer-type"/>
<xsd:complexType name="customer-type">
<xsd:sequence>
<xsd:element name="picture" type="xsd:hexBinary"/>
<xsd:element name="resume" type="xsd:base64Binary"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>


Code Sample
XMLField pictureField = new XMLField("picture/text()")
pictureField.setSchemaType(XMLConstants.HEX_BINARY_QNAME);


Setting custom conversion pairs: By default in TopLink XML built-in schema types are associated with java classes and vice versa. These default pairs can be modified by the user using the addJavaConversion and addXMLConversion api. For example by default a java.util.Calendar is mapped to the dateTime schema type so the XML will be formated based on that type. Below are the default schema type to java type conversion pairs and the default java type to schema type conversion pairs.

XML schema type to Java type default conversion pairs

Schema Type	Java Type
base64Binary	byte[]
boolean	boolean
byte	byte
date	java.util.Calendar
dateTime	java.util.Calendar
decimal	java.math.BigDecimal
double	double
float	float
hexBinary	byte[]
int	int
integer	java.math.BigInteger
long	long
QName	javax.xml.namespace.QName
time	java.util.Calendar
unsignedByte	short
unsignedInt	long
unsignedShort	int
anySimpleType	java.lang.String

Java type to XML schema type default conversion pairs

Java Type	Schema Type
byte[]	hexBinary
java.lang.Byte[]	hexBinary
java.math.BigDecimal	decimal
java.math.BigInteger	integer
boolean	boolean
java.lang.Boolean	boolean
java.lang.Byte	Byte
byte	byte
java.util.Calendar	dateTime
java.util.GregorianCalendar	dateTime
double	double
java.lang.Double	double
float	float
java.lang.Float	float
int	int
java.lang.Integer	int
long	long
java.lang.Long	long
short	short
java.lang.Short	short
javax.xml.namespace.QName	QName
java.lang.String	string

See Also:

XMLUnionField, Serialized Form

Constructor Summary

XMLField()
Default constructor, create a new XMLField

XMLField(java.lang.String xPath)
Default constructor, create a new XMLField based on the specified xPath

Method Summary

void	addConversion(javax.xml.namespace.QName qname, java.lang.Class javaClass) Add an entry for both an XML Conversion and a Java Conversion entry
void	addJavaConversion(java.lang.Class javaClass, javax.xml.namespace.QName qname) Add a Java to XML Conversion pair entry
void	addXMLConversion(javax.xml.namespace.QName qname, java.lang.Class javaClass) Add an XML to Java Conversion pair entry
java.lang.Class	getJavaClass(javax.xml.namespace.QName qname) Return the class for a given qualified XML Schema type
javax.xml.namespace.QName	getLeafElementType()
NamespaceResolver	getNamespaceResolver() Get the NamespaceResolver associated with this XMLField
javax.xml.namespace.QName	getSchemaType() Return the schema type associated with this field
javax.xml.namespace.QName	getXMLType(java.lang.Class javaClass) Return the qualified XML Schema type for a given class
java.lang.String	getXPath() Returns the xpath statement associated with this XMLField
boolean	isTypedTextField() Returns if the field is a typed text field True when we should base conversions on the "type" attribute on elements
void	removeConversion(javax.xml.namespace.QName qname, java.lang.Class javaClass) Remove both a Java to XML Conversion and the corresponding XML to Java Conversion entry
void	removeJavaConversion(java.lang.Class javaClass) Remove a Java to XML Conversion entry
void	removeXMLConversion(javax.xml.namespace.QName qname) Remove an XML to Java Conversion entry
void	setIsTypedTextField(boolean value) Set if the field is a typed text field True when we should base conversions on the "type" attribute on elements
void	setLeafElementType(javax.xml.namespace.QName type) Assumes type is in the format prefix:localPart, or localPart.
void	setName(java.lang.String xPath) This has the same effect as calling the setXPath method
void	setNamespaceResolver(NamespaceResolver newNamespaceResolver) Set the NamespaceResolver associated with this XMLField
void	setSchemaType(javax.xml.namespace.QName value) Sets the schematype associated with this XMLField This is an optional setting; when set the schema type will be used to format the XML appropriately
void	setUsesSingleNode(boolean usesSingleNode) Sets whether the mapping uses a single node.
void	setXPath(java.lang.String xPath) Set the xpath statment for this XMLField.
boolean	usesSingleNode() Checks whether the mapping uses a single node.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

XMLField

public XMLField()

Default constructor, create a new XMLField

XMLField

public XMLField(java.lang.String xPath)

Default constructor, create a new XMLField based on the specified xPath

Parameters:

xPath - The xPath statement for this field

Method Detail

getXPath

public java.lang.String getXPath()

Returns the xpath statement associated with this XMLField

Returns:

The xpath statement associated with this XMLField

setXPath

public void setXPath(java.lang.String xPath)

Set the xpath statment for this XMLField.

Parameters:

xPath - The xpath statement to be associated with this XMLField

getNamespaceResolver

public NamespaceResolver getNamespaceResolver()

Get the NamespaceResolver associated with this XMLField

Returns:

The NamespaceResolver associated with this XMLField

See Also:

NamespaceResolver

setNamespaceResolver

public void setNamespaceResolver(NamespaceResolver newNamespaceResolver)

Set the NamespaceResolver associated with this XMLField

Parameters:

newNamespaceResolver - The namespaceResolver to be associated with this XMLField

See Also:

NamespaceResolver

setUsesSingleNode

public void setUsesSingleNode(boolean usesSingleNode)

Sets whether the mapping uses a single node.

Parameters:

usesSingleNode - True if the items in the collection are in a single node or false if each of the items in the collection is in its own node

usesSingleNode

public boolean usesSingleNode()

Checks whether the mapping uses a single node.

Returns:

True if the items in the collection are in a single node or false if each of the items in the collection is in its own node.

setSchemaType

public void setSchemaType(javax.xml.namespace.QName value)

Sets the schematype associated with this XMLField This is an optional setting; when set the schema type will be used to format the XML appropriately

Parameters:

value - QName to be added to the list of schema types

getSchemaType

public javax.xml.namespace.QName getSchemaType()

Return the schema type associated with this field

Returns:

the schema type

isTypedTextField

public boolean isTypedTextField()

Returns if the field is a typed text field True when we should base conversions on the "type" attribute on elements

Returns:

True when we should base conversions on the "type" attribute on elements, otherwise false

setIsTypedTextField

public void setIsTypedTextField(boolean value)

Set if the field is a typed text field True when we should base conversions on the "type" attribute on elements

Parameters:

value - The boolean value specifiy if this is a typed text field

setName

public void setName(java.lang.String xPath)

This has the same effect as calling the setXPath method

Overrides:

DatabaseField in class oracle.toplink.internal.helper.DatabaseField

Parameters:

xPath - The xPath associated with this XMLField

getJavaClass

public java.lang.Class getJavaClass(javax.xml.namespace.QName qname)

Return the class for a given qualified XML Schema type

Parameters:

qname - The qualified name of the XML Schema type to use as a key in the lookup

Returns:

The class corresponding to the specified schema type, if no corresponding match found returns null

getXMLType

public javax.xml.namespace.QName getXMLType(java.lang.Class javaClass)

Return the qualified XML Schema type for a given class

Parameters:

javaClass - The class to use as a key in the lookup

Returns:

QName The qualified XML Schema type, if no corresponding match found returns null

addXMLConversion

public void addXMLConversion(javax.xml.namespace.QName qname,
                             java.lang.Class javaClass)

Add an XML to Java Conversion pair entry

Parameters:

qname - The qualified name of the XML schema type

javaClass - The class to add

addJavaConversion

public void addJavaConversion(java.lang.Class javaClass,
                              javax.xml.namespace.QName qname)

Add a Java to XML Conversion pair entry

Parameters:

javaClass - The class to add

qname - The qualified name of the XML schema type

addConversion

public void addConversion(javax.xml.namespace.QName qname,
                          java.lang.Class javaClass)

Add an entry for both an XML Conversion and a Java Conversion entry

Parameters:

qname - The qualified name of the XML schema type

javaClass -

removeXMLConversion

public void removeXMLConversion(javax.xml.namespace.QName qname)

Remove an XML to Java Conversion entry

Parameters:

qname -

removeJavaConversion

public void removeJavaConversion(java.lang.Class javaClass)

Remove a Java to XML Conversion entry

Parameters:

javaClass -

removeConversion

public void removeConversion(javax.xml.namespace.QName qname,
                             java.lang.Class javaClass)

Remove both a Java to XML Conversion and the corresponding XML to Java Conversion entry

Parameters:

qname -

javaClass -

setLeafElementType

public void setLeafElementType(javax.xml.namespace.QName type)

Assumes type is in the format prefix:localPart, or localPart.

Parameters:

type -

getLeafElementType

public javax.xml.namespace.QName getLeafElementType()