net.sf.saxon.dom
Class DOMEnvelope

java.lang.Object
  net.sf.saxon.dom.DOMEnvelope

All Implemented Interfaces:

Serializable, ExternalObjectModel

public class DOMEnvelope
extends Object
implements ExternalObjectModel, Serializable

DOMEnvelope is an object model representation in which DOM interfaces are wrapped around Saxon NodeInfo nodes: that is, it implements the DOM on top of a Saxon tree implementation such as the tiny tree or linked tree.

See Also:

Serialized Form

Constructor Summary

DOMEnvelope()
Public constructor.

Method Summary

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	getIdentifyingURI() Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation
static DOMEnvelope	getInstance() Get the singular instance (this class is stateless)
JPConverter	getJPConverter(Class sourceClass) Get a converter from values in the external object model to XPath values.
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.
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.

Methods inherited from class java.lang.Object

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

Constructor Detail

DOMEnvelope

public DOMEnvelope()

Public constructor. (Use the singular instance in preference to creating a new one).

Method Detail

getInstance

public static DOMEnvelope getInstance()

Get the singular instance (this class is stateless)

Returns:

the singular instance

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.

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)

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

Parameters:

object - the object to be tested

Returns:

true if the supplied object is a node in this object model

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)
                            throws XPathException

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.

This implementation always returns null: it is not possible to construct an instance of this object model implementation directly as the result of a JAXP transformation.

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

Throws:

XPathException - if any failure occurs

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.

This implementation returns true only if the source is a DOMSource whose contained node is a a "NodeOverNodeInfo".

Specified by:

sendSource in interface ExternalObjectModel

Parameters:

source - a JAXP Source object

receiver - the Receiver that is to receive the data from the Source

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