net.sf.saxon.option.xom

Class XOMObjectModel

java.lang.Object

net.sf.saxon.om.TreeModel

net.sf.saxon.option.xom.XOMObjectModel

All Implemented Interfaces:

ExternalObjectModel

public class XOMObjectModel
extends TreeModel
implements ExternalObjectModel

This interface must be implemented by any third-party object model that can be wrapped with a wrapper that implements the Saxon Object Model (the NodeInfo interface). This implementation of the interface supports wrapping of JDOM Documents.

This is a singleton class whose instance can be obtained using the getInstance() method. However, the constructor is public for backwards compatibility.

The class extends TreeModel so that any interface expected a TreeModel, for example XdmDestination.setTreeModel(net.sf.saxon.om.TreeModel), can take XOMObjectModel.getInstance() as an argument.

Field Summary

Fields inherited from class net.sf.saxon.om.TreeModel

LINKED_TREE, TINY_TREE, TINY_TREE_CONDENSED

Constructor Summary

Constructors

Constructor and Description
XOMObjectModel()

Method Summary

Methods

Modifier and Type	Method and Description
Object	convertXPathValueToObject(Sequence value, Object targetClass) Convert an XPath value to an object in this object model.
Receiver	getDocumentBuilder(Result result) Test whether this object model recognizes a particular kind of JAXP Result object, and if it does, return a Receiver that builds an instance of this data model from a sequence of events.
String	getDocumentClassName() Get the name of a characteristic class, which, if it can be loaded, indicates that the supporting libraries for this object model implementation are available on the classpath
String	getIdentifyingURI() Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation
static XOMObjectModel	getInstance()
JPConverter	getJPConverter(Class sourceClass, Configuration config) Get a converter from values in the external object model to XPath values.
String	getName() Get a name that identifies the tree model
PJConverter	getNodeListCreator(Object node) Get a converter that converts a sequence of XPath nodes to this model's representation of a node list.
PJConverter	getPJConverter(Class targetClass) Get a converter from XPath values to values in the external object model
boolean	isRecognizedNode(Object object) Test whether this object model recognizes a given node as one of its own
boolean	isRecognizedNodeClass(Class nodeClass) Test whether this object model recognizes a given class as representing a node in that object model.
Builder	makeBuilder(PipelineConfiguration pipe) Make a Builder, which can then be used to construct an instance of this tree model from a stream of events
boolean	sendSource(Source source, Receiver receiver) Test whether this object model recognizes a particular kind of JAXP Source object, and if it does, send the contents of the document to a supplied Receiver, and return true.
NodeInfo	unravel(Source source, Configuration config) Wrap or unwrap a node using this object model to return the corresponding Saxon node.
TreeInfo	wrapDocument(Object node, Configuration config) Wrap a document node in the external object model in a document wrapper that implements the Saxon DocumentInfo interface
NodeInfo	wrapNode(TreeInfo document, Object node) Wrap a node within the external object model in a node wrapper that implements the Saxon VirtualNode interface (which is an extension of NodeInfo)

Methods inherited from class net.sf.saxon.om.TreeModel

getSymbolicValue, getTreeModel, isMutable, isSchemaAware

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XOMObjectModel

public XOMObjectModel()

Method Detail

getInstance

public static XOMObjectModel getInstance()

getDocumentClassName

public String getDocumentClassName()

Get the name of a characteristic class, which, if it can be loaded, indicates that the supporting libraries for this object model implementation are available on the classpath

Specified by:

getDocumentClassName in interface ExternalObjectModel

Returns:

by convention (but not necessarily) the class that implements a document node in the relevant external model

getIdentifyingURI

public String getIdentifyingURI()

Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation

Specified by:

getIdentifyingURI in interface ExternalObjectModel

Returns:

the URI used to identify this object model in the JAXP XPath factory mechanism.

getName

public String getName()

Description copied from class: TreeModel

Get a name that identifies the tree model

Overrides:

getName in class TreeModel

Returns:

an identifying name for the tree model

makeBuilder

public Builder makeBuilder(PipelineConfiguration pipe)

Description copied from class: TreeModel

Make a Builder, which can then be used to construct an instance of this tree model from a stream of events

Specified by:

makeBuilder in class TreeModel

Parameters:

pipe - A PipelineConfiguration, which can be constructed using the method Configuration.makePipelineConfiguration().

Returns:

a newly created Builder

getPJConverter

public PJConverter getPJConverter(Class targetClass)

Description copied from interface: ExternalObjectModel

Get a converter from XPath values to values in the external object model

Specified by:

getPJConverter in interface ExternalObjectModel

Parameters:

targetClass - the required class of the result of the conversion. If this class represents a node or list of nodes in the external object model, the method should return a converter that takes a native node or sequence of nodes as input and returns a node or sequence of nodes in the external object model representation. Otherwise, it should return null.

Returns:

a converter, if the targetClass is recognized as belonging to this object model; otherwise null

getJPConverter

public JPConverter getJPConverter(Class sourceClass,
                         Configuration config)

Description copied from interface: ExternalObjectModel

Get a converter from values in the external object model to XPath values.

Specified by:

getJPConverter in interface ExternalObjectModel

Parameters:

sourceClass - the class (static or dynamic) of values to be converted

Returns:

a converter, if the sourceClass is recognized as belonging to this object model; otherwise null

getNodeListCreator

public PJConverter getNodeListCreator(Object node)

Get a converter that converts a sequence of XPath nodes to this model's representation of a node list.

Specified by:

getNodeListCreator in interface ExternalObjectModel

Parameters:

node - an example of the kind of node used in this model

Returns:

if the model does not recognize this node as one of its own, return null. Otherwise return a PJConverter that takes a list of XPath nodes (represented as NodeInfo objects) and returns a collection of nodes in this object model

isRecognizedNode

public boolean isRecognizedNode(Object object)

Test whether this object model recognizes a given node as one of its own

isRecognizedNodeClass

public boolean isRecognizedNodeClass(Class nodeClass)

Test whether this object model recognizes a given class as representing a node in that object model. This method will generally be called at compile time.

Parameters:

nodeClass - A class that possibly represents nodes

Returns:

true if the class is used to represent nodes in this object model

getDocumentBuilder

public Receiver getDocumentBuilder(Result result)

Test whether this object model recognizes a particular kind of JAXP Result object, and if it does, return a Receiver that builds an instance of this data model from a sequence of events. If the Result is not recognised, return null.

Specified by:

getDocumentBuilder in interface ExternalObjectModel

Parameters:

result - a JAXP result object

Returns:

a Receiver that writes to that result, if available; or null otherwise

sendSource

public boolean sendSource(Source source,
                 Receiver receiver)
                   throws XPathException

Test whether this object model recognizes a particular kind of JAXP Source object, and if it does, send the contents of the document to a supplied Receiver, and return true. Otherwise, return false.

Specified by:

sendSource in interface ExternalObjectModel

Parameters:

source - a JAXP Source object

receiver - the Receiver that is to receive the data from the Source. The caller is responsible for opening and closing the receiver.

Returns:

true if the data from the Source has been sent to the Receiver, false otherwise

Throws:

XPathException - if any failure occurs

unravel

public NodeInfo unravel(Source source,
               Configuration config)

Wrap or unwrap a node using this object model to return the corresponding Saxon node. If the supplied source does not belong to this object model, return null

Specified by:

unravel in interface ExternalObjectModel

Parameters:

source - a JAXP Source object

config - the Saxon configuration

Returns:

a NodeInfo corresponding to the Source, if this can be constructed; otherwise null

convertXPathValueToObject

public Object convertXPathValueToObject(Sequence value,
                               Object targetClass)
                                 throws XPathException

Convert an XPath value to an object in this object model. If the supplied value can be converted to an object in this model, of the specified class, then the conversion should be done and the resulting object returned. If the value cannot be converted, the method should return null. Note that the supplied class might be a List, in which case the method should inspect the contents of the Value to see whether they belong to this object model.

Throws:

XPathException

wrapDocument

public TreeInfo wrapDocument(Object node,
                    Configuration config)

Wrap a document node in the external object model in a document wrapper that implements the Saxon DocumentInfo interface

Parameters:

node - a node (any node) in the third party document

config - the Saxon configuration (which among other things provides access to the NamePool)

Returns:

the wrapper, which must implement DocumentInfo

wrapNode

public NodeInfo wrapNode(TreeInfo document,
                Object node)

Wrap a node within the external object model in a node wrapper that implements the Saxon VirtualNode interface (which is an extension of NodeInfo)

Parameters:

document - the document wrapper, as a DocumentInfo object

node - the node to be wrapped. This must be a node within the document wrapped by the DocumentInfo provided in the first argument

Returns:

the wrapper for the node, as an instance of VirtualNode