net.sf.saxon.dom4j
Class DOM4JObjectModel

java.lang.Object
  net.sf.saxon.dom4j.DOM4JObjectModel

All Implemented Interfaces:

java.io.Serializable, ExternalObjectModel

public class DOM4JObjectModel
extends java.lang.Object
implements ExternalObjectModel, java.io.Serializable

This class is the DOM4J implementation of Saxon's ExternalObjectModel interface; it supports the wrapping of DOM4J documents as instances of the Saxon NodeInfo interface.

See Also:

Serialized Form

Constructor Summary

DOM4JObjectModel()

Method Summary

Value	convertObjectToXPathValue(java.lang.Object object, Configuration config) Convert a Java object to an XPath value.
java.lang.Object	convertXPathValueToObject(Value value, java.lang.Object targetClass, XPathContext context) Convert an XPath value to an object in this object model.
Receiver	getDocumentBuilder(javax.xml.transform.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.
java.lang.String	getIdentifyingURI() Get the URI of the external object model as used in the JAXP factory interfaces for obtaining an XPath implementation
JPConverter	getJPConverter(java.lang.Class targetClass) Get a converter from XPath values to values in the external object model
PJConverter	getNodeListCreator(java.lang.Object node) Get a converter that converts a sequence of XPath nodes to this model's representation of a node list.
PJConverter	getPJConverter(java.lang.Class targetClass) Get a converter from XPath values to values in the external object model
boolean	isRecognizedNode(java.lang.Object object) Test whether this object model recognizes a given node as one of its own
boolean	isRecognizedNodeListClass(java.lang.Class nodeClass) Test whether this object model recognizes a given class as representing a list of nodes in that object model.
boolean	sendSource(javax.xml.transform.Source source, Receiver receiver, PipelineConfiguration pipe) 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(javax.xml.transform.Source source, Configuration config) Wrap or unwrap a node using this object model to return the corresponding Saxon node.
DocumentInfo	wrapDocument(java.lang.Object node, java.lang.String baseURI, Configuration config) Wrap a document node in the external object model in a document wrapper that implements the Saxon DocumentInfo interface
NodeInfo	wrapNode(DocumentInfo document, java.lang.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 java.lang.Object

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

Constructor Detail

DOM4JObjectModel

public DOM4JObjectModel()

Method Detail

getIdentifyingURI

public java.lang.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

getPJConverter

public PJConverter getPJConverter(java.lang.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(java.lang.Class targetClass)

Description copied from interface: ExternalObjectModel

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

Specified by:

getJPConverter 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 an object of this class as input and returns a node or sequence of nodes in the native Saxon representation. Otherwise, it should return null.

Returns:

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

getNodeListCreator

public PJConverter getNodeListCreator(java.lang.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(java.lang.Object object)

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

isRecognizedNodeListClass

public boolean isRecognizedNodeListClass(java.lang.Class nodeClass)

Test whether this object model recognizes a given class as representing a list of nodes 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(javax.xml.transform.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(javax.xml.transform.Source source,
                          Receiver receiver,
                          PipelineConfiguration pipe)
                   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

pipe - configuration information

Returns:

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

Throws:

XPathException

unravel

public NodeInfo unravel(javax.xml.transform.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

convertObjectToXPathValue

public Value convertObjectToXPathValue(java.lang.Object object,
                                       Configuration config)
                                throws XPathException

Convert a Java object to an XPath value. If the supplied object is recognized as a representation of a value using this object model, the object model should convert the value to an XPath value and return this as the result. If not, it should return null. If the object is recognized but cannot be converted, an exception should be thrown

Throws:

XPathException

convertXPathValueToObject

public java.lang.Object convertXPathValueToObject(Value value,
                                                  java.lang.Object targetClass,
                                                  XPathContext context)

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.

wrapDocument

public DocumentInfo wrapDocument(java.lang.Object node,
                                 java.lang.String baseURI,
                                 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

baseURI - the base URI of the node (supply "" if unknown)

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

Returns:

the wrapper, which must implement DocumentInfo

wrapNode

public NodeInfo wrapNode(DocumentInfo document,
                         java.lang.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