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oracle.toplink.ox.mappings
Class XMLCompositeObjectMapping

java.lang.Object
oracle.toplink.mappings.DatabaseMapping
oracle.toplink.mappings.AggregateMapping
oracle.toplink.mappings.foundation.AbstractCompositeObjectMapping
oracle.toplink.ox.mappings.XMLCompositeObjectMapping

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, oracle.toplink.ox.mappings.XMLMapping, oracle.toplink.ox.mappings.XMLNillableMapping

public class XMLCompositeObjectMapping

extends AbstractCompositeObjectMapping

implements oracle.toplink.ox.mappings.XMLMapping, oracle.toplink.ox.mappings.XMLNillableMapping

Composite object XML mappings represent a relationship between two classes. In XML, the "owned" class may be nested with the element tag representing the "owning" class. This mapping is, by definition, privately owned.

Composite object XML mappings can be used in the following scenarios:

• Mapping into the Parent Record
• Mapping to an Element
• Mapping to Different Elements by Element Name
• Mapping to Different Elements by Element Position

Setting the XPath: TopLink XML mappings make use of 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 path and positional information; the last node in the XPath forms the local root node for the composite object. The XPath is specified on the mapping using the setXPath method.

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

XPath	Description
.	Indicates "self".
phone-number	The phone-number information is stored in the phone-number element.
contact-info/phone-number	The XPath statement may be used to specify any valid path.
phone-number[2]	The XPath statement may contain positional information. In this case the phone-number information is stored in the second occurrence of the phone-number element.

Mapping into the Parent Record: The composite object may be mapped into the parent record in a corresponding XML document.

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

Code Sample
XMLCompositeObjectMapping addressMapping = new XMLCompositeObjectMapping();
addressMapping.setAttributeName("address");
addressMapping.setXPath(".");
addressMapping.setReferenceClass(Address.class);


Mapping to an Element: The composite object may be mapped to an element in a corresponding XML document.

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


Code Sample
XMLCompositeObjectMapping addressMapping = new XMLCompositeObjectMapping();
addressMapping.setAttributeName("address");
addressMapping.setXPath("address");
addressMapping.setReferenceClass(Address.class);


More Information: For more information about using the XML Composite Object Mapping, see the "Understanding XML Mappings" chapter of the Oracle TopLink Developer's Guide.

Since:

Oracle TopLink 10g Release 2 (10.1.3)

See Also:

Serialized Form

Constructor Summary

XMLCompositeObjectMapping()

Method Summary

void	configureNestedRow(oracle.toplink.internal.sessions.AbstractRecord parent, oracle.toplink.internal.sessions.AbstractRecord child)
ClassDescriptor	getReferenceDescriptor(DOMRecord xmlRecord)
java.lang.String	getXPath() Get the XPath String
void	setNullPolicy(AbstractNullPolicy aNullPolicy) Set the AbstractNullPolicy on the mapping The default policy is NullPolicy.
void	setXPath(java.lang.String xpathString) Set the Mapping field name attribute to the given XPath String
java.lang.Object	valueFromRow(java.lang.Object fieldValue, XMLRecord nestedRow, oracle.toplink.internal.queryframework.JoinedAttributeManager joinManager, ObjectBuildingQuery sourceQuery, oracle.toplink.internal.sessions.AbstractSession executionSession)

Methods inherited from class oracle.toplink.mappings.foundation.AbstractCompositeObjectMapping

getConverter, hasConverter, setConverter, setField

Methods inherited from class oracle.toplink.mappings.AggregateMapping

getReferenceClass, setReferenceClass

Methods inherited from class oracle.toplink.mappings.DatabaseMapping

getAttributeAccessor, getAttributeClassification, getAttributeName, getGetMethodName, getProperty, getSetMethodName, isLazy, isOptional, isUsingMethodAccess, readOnly, readWrite, setAttributeAccessor, setAttributeName, setGetMethodName, setIsLazy, setIsOptional, setIsReadOnly, setProperty, setSetMethodName, setWeight, simpleAddToCollectionChangeRecord, simpleRemoveFromCollectionChangeRecord

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

XMLCompositeObjectMapping

public XMLCompositeObjectMapping()

Method Detail

setNullPolicy

public void setNullPolicy(AbstractNullPolicy aNullPolicy)

Set the AbstractNullPolicy on the mapping
The default policy is NullPolicy.

Specified by:

setNullPolicy in interface oracle.toplink.ox.mappings.XMLNillableMapping

Parameters:

aNullPolicy -

getXPath

public java.lang.String getXPath()

Get the XPath String

Returns:

String the XPath String associated with this Mapping

setXPath

public void setXPath(java.lang.String xpathString)

Set the Mapping field name attribute to the given XPath String

Parameters:

xpathString - String

valueFromRow

public java.lang.Object valueFromRow(java.lang.Object fieldValue,
                                     XMLRecord nestedRow,
                                     oracle.toplink.internal.queryframework.JoinedAttributeManager joinManager,
                                     ObjectBuildingQuery sourceQuery,
                                     oracle.toplink.internal.sessions.AbstractSession executionSession)
                              throws DatabaseException

Throws:

DatabaseException

configureNestedRow

public void configureNestedRow(oracle.toplink.internal.sessions.AbstractRecord parent,
                               oracle.toplink.internal.sessions.AbstractRecord child)

getReferenceDescriptor

public ClassDescriptor getReferenceDescriptor(DOMRecord xmlRecord)

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