ObjectModelFactory (JBoss/Common API) - JBoss 4.0.1 sp1 common API Documentation 英文版文档

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org.jboss.xml.binding
Interface ObjectModelFactory

All Known Subinterfaces:: GenericObjectModelFactory

All Known Implementing Classes:: DelegatingObjectModelFactory, MappingObjectModelFactory, SchemalessObjectModelFactory

public interface ObjectModelFactory

The interface all object model factories must implement. Object model factories are used on unmarshalling to build the object graph.

Each object model factory must implement one method newRoot defined in the ObjectModelFactory interface and a set of newChild, addChild and setValue methods descovered by the framework at runtime with introspection. So the following methods should be implemented:

newRoot method
```
 public Object newRoot(java.lang.Object root,
                       org.jboss.xml.binding.ContentNavigator navigator,
                       java.lang.String namespaceURI,
                       java.lang.String localName,
                       org.xml.sax.Attributes attrs)
 
```
This method is called on the object model factory by the framework and returns the root of the object model. If the root argument is null the factory is supposed to create and return a new one. If the root argument is not null (i.e. the user provided the root object through the org.jboss.xml.binding.Unmarshaller) the factory should either just return it as is or extract the real root from the root argument corresponding to the namespace URI and local name.
a set of newChild methods. This method is called by the framework on the object model factory when parsing of a new XML element started. Each newChild method must have five arguments:
1. parent object of a concrete Java type (not java.lang.Object) for this new child
2. instance of org.jboss.xml.binding.ContentNavigator
3. namespace URI of the child XML element as java.lang.String
4. local name of the child XML element as java.lang.String
5. attributes of the child XML element as org.xml.sax.Attributes
Each newChild() method returns either a new instance of a child object that represents the XML element with the namespace URI and local name (in this case, the child XML element is accepted, i.e. should be represented in the object graph) or null if this child XML element should be ignored, i.e. not be represented in the object graph.
a set of addChild methods This method is called on the object model factory by the framework when parsing of a child XML element is complete. The arguments of the addChild() method are:
1. parent object of a conrete Java type (not java.lang.Object) of the child
2. child object of a concrete Java type (returned earlier by the newChild)
3. instance of org.jboss.xml.binding.ContentNavigator
4. namespace URI for the child XML element as java.lang.String
5. local name for the child XML element as java.lang.String
When addChild method is called, the child object is supposed to be populated with all the data from the corresponding XML element. The child object now can be validated and added to the parent.
a set of setValue methods This method is called on the object model factory by the framework when a new XML element with text content was parsed. The method must have four arguments:
1. an object of a concrete Java type (not java.lang.Object) which was returned earlier by a newChild for which the value of an XML element was read
2. instance of org.jboss.xml.binding.ContentNavigator
3. namespace URI of the child XML element as java.lang.String
4. local name of the child XML element as java.lang.String
5. the value of the child XML element as java.lang.String
In setValue method the object model factory is supposed to set a value on the field which represents the parsed XML element possibly converting the parsed XML element value to the field's Java type.

Version:: $Revision: 1.9.2.1 $
Author:: Alexey Loubyansky

Method Summary

Object newRoot(Object root, ContentNavigator navigator, String namespaceURI, String localName, Attributes attrs)
This method is called by the object model factory and returns the root of the object graph.

Method Detail

newRoot

public Object newRoot(Object root,
                      ContentNavigator navigator,
                      String namespaceURI,
                      String localName,
                      Attributes attrs)

This method is called by the object model factory and returns the root of the object graph. If the root argument is null the factory is supposed to create and return a new one. If the root argument is not null (i.e. the user provided the root object through the org.jboss.xml.binding.Unmarshaller) then the factory should either just return it as is or extract the real root from the root argument based on the namespace URI and local name.

Parameters:: root - an object that is the root or which contains the root object; navigator - content navigator; namespaceURI - namespace URI of the root; localName - local name of the root; attrs - attributes of the root object
Returns:: the root of the object graph