org.apache.xml.dtm.ref.dom2dtm

Class DOM2DTM

Implemented Interfaces:
DTM

public class DOM2DTM
extends DTMDefaultBaseIterators

The DOM2DTM class serves up a DOM's contents via the DTM API. Note that it doesn't necessarily represent a full Document tree. You can wrap a DOM2DTM around a specific node and its subtree and the right things should happen. (I don't _think_ we currently support DocumentFrgment nodes as roots, though that might be worth considering.) Note too that we do not currently attempt to track document mutation. If you alter the DOM after wrapping DOM2DTM around it, all bets are off.

Nested Class Summary

Field Summary

Fields inherited from class org.apache.xml.dtm.ref.DTMDefaultBase

DEFAULT_BLOCKSIZE, DEFAULT_NUMBLOCKS, DEFAULT_NUMBLOCKS_SMALL, ROOTNODE, m_mgr

Fields inherited from interface org.apache.xml.dtm.DTM

ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NAMESPACE_NODE, NOTATION_NODE, NTYPES, NULL, PROCESSING_INSTRUCTION_NODE, ROOT_NODE, TEXT_NODE

Constructor Summary

DOM2DTM(DTMManager mgr, DOMSource domSource, int dtmIdentity, DTMWSFilter whiteSpaceFilter, XMLStringFactory xstringfactory, boolean doIndexing)
Construct a DOM2DTM object from a DOM node.

Method Summary

void
dispatchCharactersEvents(int nodeHandle, ContentHandler ch, boolean normalize)
Directly call the characters method on the passed ContentHandler for the string-value of the given node (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
void
dispatchToEvents(int nodeHandle, ContentHandler ch)
Directly create SAX parser events from a subtree.
int
getAttributeNode(int nodeHandle, String namespaceURI, String name)
Retrieves an attribute node by by qualified name and namespace URI.
ContentHandler
getContentHandler()
getContentHandler returns "our SAX builder" -- the thing that someone else should send SAX events to in order to extend this DTM model.
DTDHandler
getDTDHandler()
Return this DTM's DTDHandler.
DeclHandler
getDeclHandler()
Return this DTM's DeclHandler.
String
getDocumentTypeDeclarationPublicIdentifier()
Return the public identifier of the external subset, normalized as described in 4.2.2 External Entities [XML].
String
getDocumentTypeDeclarationSystemIdentifier()
A document type declaration information item has the following properties: 1. [system identifier] The system identifier of the external subset, if it exists.
int
getElementById(String elementId)
Returns the Element whose ID is given by elementId.
EntityResolver
getEntityResolver()
Return this DTM's EntityResolver.
ErrorHandler
getErrorHandler()
Return this DTM's ErrorHandler.
int
getHandleOfNode(Node node)
Get the handle from a Node.
LexicalHandler
getLexicalHandler()
Return this DTM's lexical handler.
String
getLocalName(int nodeHandle)
Given a node handle, return its XPath-style localname.
String
getNamespaceURI(int nodeHandle)
Given a node handle, return its DOM-style namespace URI (As defined in Namespaces, this is the declared URI which this node's prefix -- or default in lieu thereof -- was mapped to.)
Node
getNode(int nodeHandle)
Return an DOM node for the given node.
String
getNodeName(int nodeHandle)
Given a node handle, return its DOM-style node name.
String
getNodeNameX(int nodeHandle)
Given a node handle, return the XPath node name.
String
getNodeValue(int nodeHandle)
Given a node handle, return its node value.
int
getNumberOfNodes()
Get the number of nodes that have been added.
String
getPrefix(int nodeHandle)
Given a namespace handle, return the prefix that the namespace decl is mapping.
SourceLocator
getSourceLocatorFor(int node)
No source information is available for DOM2DTM, so return null here.
XMLString
getStringValue(int nodeHandle)
Get the string-value of a node as a String object (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
String
getUnparsedEntityURI(String name)
The getUnparsedEntityURI function returns the URI of the unparsed entity with the specified name in the same document as the context node (see [3.3 Unparsed Entities]).
boolean
isAttributeSpecified(int attributeHandle)
5. [specified] A flag indicating whether this attribute was actually specified in the start-tag of its element, or was defaulted from the DTD.
boolean
isWhitespace(int nodeHandle)
Determine if the string-value of a node is whitespace
boolean
needsTwoThreads()
void
setIncrementalSAXSource(IncrementalSAXSource source)
Bind an IncrementalSAXSource to this DTM.
void
setProperty(String property, Object value)
For the moment all the run time properties are ignored by this class.

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseIterators

getAxisIterator, getTypedAxisIterator

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseTraversers

getAxisTraverser

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBase

appendChild, appendTextChild, dispatchCharactersEvents, dispatchToEvents, documentRegistration, documentRelease, dumpDTM, dumpNode, getAttributeNode, getDTMIDs, getDocument, getDocumentAllDeclarationsProcessed, getDocumentBaseURI, getDocumentEncoding, getDocumentRoot, getDocumentStandalone, getDocumentSystemIdentifier, getDocumentTypeDeclarationPublicIdentifier, getDocumentTypeDeclarationSystemIdentifier, getDocumentVersion, getElementById, getExpandedTypeID, getExpandedTypeID, getFirstAttribute, getFirstChild, getFirstNamespaceNode, getLastChild, getLevel, getLocalName, getLocalNameFromExpandedNameID, getManager, getNamespaceFromExpandedNameID, getNamespaceType, getNamespaceURI, getNextAttribute, getNextNamespaceNode, getNextSibling, getNode, getNodeHandle, getNodeIdent, getNodeName, getNodeNameX, getNodeType, getNodeValue, getOwnerDocument, getParent, getPrefix, getPreviousSibling, getStringValue, getStringValueChunk, getStringValueChunkCount, getTypedFirstChild, getTypedNextSibling, getUnparsedEntityURI, hasChildNodes, isAttributeSpecified, isCharacterElementContentWhitespace, isDocumentAllDeclarationsProcessed, isNodeAfter, isSupported, makeNodeHandle, makeNodeIdentity, migrateTo, setDocumentBaseURI, setFeature, supportsPreStripping

Constructor Details

DOM2DTM

public DOM2DTM(DTMManager mgr,
               DOMSource domSource,
               int dtmIdentity,
               DTMWSFilter whiteSpaceFilter,
               XMLStringFactory xstringfactory,
               boolean doIndexing)
Construct a DOM2DTM object from a DOM node.

Parameters:
mgr - The DTMManager who owns this DTM.
domSource - the DOM source that this DTM will wrap.
dtmIdentity - The DTM identity ID for this DTM.
whiteSpaceFilter - The white space filter for this DTM, which may be null.
xstringfactory - XMLString factory for creating character content.
doIndexing - true if the caller considers it worth it to use indexing schemes.

Method Details

dispatchCharactersEvents

public void dispatchCharactersEvents(int nodeHandle,
                                     ContentHandler ch,
                                     boolean normalize)
            throws SAXException
Directly call the characters method on the passed ContentHandler for the string-value of the given node (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value). Multiple calls to the ContentHandler's characters methods may well occur for a single call to this method.
Specified by:
dispatchCharactersEvents in interface DTM
Overrides:
dispatchCharactersEvents in interface DTMDefaultBase

Parameters:
nodeHandle - The node ID.
ch - A non-null reference to a ContentHandler.

Throws:
SAXException -


dispatchToEvents

public void dispatchToEvents(int nodeHandle,
                             ContentHandler ch)
            throws SAXException
Directly create SAX parser events from a subtree.
Specified by:
dispatchToEvents in interface DTM
Overrides:
dispatchToEvents in interface DTMDefaultBase

Parameters:
nodeHandle - The node ID.
ch - A non-null reference to a ContentHandler.

Throws:
SAXException -


getAttributeNode

public int getAttributeNode(int nodeHandle,
                            String namespaceURI,
                            String name)
Retrieves an attribute node by by qualified name and namespace URI.
Specified by:
getAttributeNode in interface DTM
Overrides:
getAttributeNode in interface DTMDefaultBase

Parameters:
nodeHandle - int Handle of the node upon which to look up this attribute..
namespaceURI - The namespace URI of the attribute to retrieve, or null.
name - The local name of the attribute to retrieve.

Returns:
The attribute node handle with the specified name ( nodeName) or DTM.NULL if there is no such attribute.


getContentHandler

public ContentHandler getContentHandler()
getContentHandler returns "our SAX builder" -- the thing that someone else should send SAX events to in order to extend this DTM model.
Specified by:
getContentHandler in interface DTM

Returns:
null if this model doesn't respond to SAX events, "this" if the DTM object has a built-in SAX ContentHandler, the IncrmentalSAXSource if we're bound to one and should receive the SAX stream via it for incremental build purposes...


getDTDHandler

public DTDHandler getDTDHandler()
Return this DTM's DTDHandler.
Specified by:
getDTDHandler in interface DTM

Returns:
null if this model doesn't respond to SAX dtd events.


getDeclHandler

public DeclHandler getDeclHandler()
Return this DTM's DeclHandler.
Specified by:
getDeclHandler in interface DTM

Returns:
null if this model doesn't respond to SAX Decl events.


getDocumentTypeDeclarationPublicIdentifier

public String getDocumentTypeDeclarationPublicIdentifier()
Return the public identifier of the external subset, normalized as described in 4.2.2 External Entities [XML]. If there is no external subset or if it has no public identifier, this property has no value.
Specified by:
getDocumentTypeDeclarationPublicIdentifier in interface DTM
Overrides:
getDocumentTypeDeclarationPublicIdentifier in interface DTMDefaultBase

Parameters:

Returns:
the public identifier String object, or null if there is none.


getDocumentTypeDeclarationSystemIdentifier

public String getDocumentTypeDeclarationSystemIdentifier()
A document type declaration information item has the following properties: 1. [system identifier] The system identifier of the external subset, if it exists. Otherwise this property has no value.
Specified by:
getDocumentTypeDeclarationSystemIdentifier in interface DTM
Overrides:
getDocumentTypeDeclarationSystemIdentifier in interface DTMDefaultBase

Returns:
the system identifier String object, or null if there is none.


getElementById

public int getElementById(String elementId)
Returns the Element whose ID is given by elementId. If no such element exists, returns DTM.NULL. Behavior is not defined if more than one element has this ID. Attributes (including those with the name "ID") are not of type ID unless so defined by DTD/Schema information available to the DTM implementation. Implementations that do not know whether attributes are of type ID or not are expected to return DTM.NULL.

%REVIEW% Presumably IDs are still scoped to a single document, and this operation searches only within a single document, right? Wouldn't want collisions between DTMs in the same process.

Specified by:
getElementById in interface DTM
Overrides:
getElementById in interface DTMDefaultBase

Parameters:
elementId - The unique id value for an element.

Returns:
The handle of the matching element.


getEntityResolver

public EntityResolver getEntityResolver()
Return this DTM's EntityResolver.
Specified by:
getEntityResolver in interface DTM

Returns:
null if this model doesn't respond to SAX entity ref events.


getErrorHandler

public ErrorHandler getErrorHandler()
Return this DTM's ErrorHandler.
Specified by:
getErrorHandler in interface DTM

Returns:
null if this model doesn't respond to SAX error events.


getHandleOfNode

public int getHandleOfNode(Node node)
Get the handle from a Node. This is a more robust version of getHandleFromNode, intended to be usable by the public.

%OPT% This will be pretty slow. %REVIEW% This relies on being able to test node-identity via object-identity. DTM2DOM proxying is a great example of a case where that doesn't work. DOM Level 3 will provide the isSameNode() method to fix that, but until then this is going to be flaky.

Parameters:
node - A node, which may be null.

Returns:
The node handle or DTM.NULL.


getLexicalHandler

public LexicalHandler getLexicalHandler()
Return this DTM's lexical handler. %REVIEW% Should this return null if constrution already done/begun?
Specified by:
getLexicalHandler in interface DTM

Returns:
null if this model doesn't respond to lexical SAX events, "this" if the DTM object has a built-in SAX ContentHandler, the IncrementalSAXSource if we're bound to one and should receive the SAX stream via it for incremental build purposes...


getLocalName

public String getLocalName(int nodeHandle)
Given a node handle, return its XPath-style localname. (As defined in Namespaces, this is the portion of the name after any colon character).
Specified by:
getLocalName in interface DTM
Overrides:
getLocalName in interface DTMDefaultBase

Parameters:
nodeHandle - the id of the node.

Returns:
String Local name of this node.


getNamespaceURI

public String getNamespaceURI(int nodeHandle)
Given a node handle, return its DOM-style namespace URI (As defined in Namespaces, this is the declared URI which this node's prefix -- or default in lieu thereof -- was mapped to.)

%REVIEW% Null or ""? -sb

Specified by:
getNamespaceURI in interface DTM
Overrides:
getNamespaceURI in interface DTMDefaultBase

Parameters:
nodeHandle - the id of the node.

Returns:
String URI value of this node's namespace, or null if no namespace was resolved.


getNode

public Node getNode(int nodeHandle)
Return an DOM node for the given node.
Specified by:
getNode in interface DTM
Overrides:
getNode in interface DTMDefaultBase

Parameters:
nodeHandle - The node ID.

Returns:
A node representation of the DTM node.


getNodeName

public String getNodeName(int nodeHandle)
Given a node handle, return its DOM-style node name. This will include names such as #text or #document.
Specified by:
getNodeName in interface DTM
Overrides:
getNodeName in interface DTMDefaultBase

Parameters:
nodeHandle - the id of the node.

Returns:
String Name of this node, which may be an empty string. %REVIEW% Document when empty string is possible... %REVIEW-COMMENT% It should never be empty, should it?


getNodeNameX

public String getNodeNameX(int nodeHandle)
Given a node handle, return the XPath node name. This should be the name as described by the XPath data model, NOT the DOM-style name.
Specified by:
getNodeNameX in interface DTM
Overrides:
getNodeNameX in interface DTMDefaultBase

Parameters:
nodeHandle - the id of the node.

Returns:
String Name of this node, which may be an empty string.


getNodeValue

public String getNodeValue(int nodeHandle)
Given a node handle, return its node value. This is mostly as defined by the DOM, but may ignore some conveniences.

Specified by:
getNodeValue in interface DTM
Overrides:
getNodeValue in interface DTMDefaultBase

Parameters:
nodeHandle - The node id.

Returns:
String Value of this node, or null if not meaningful for this node type.


getNumberOfNodes

public int getNumberOfNodes()
Get the number of nodes that have been added.


getPrefix

public String getPrefix(int nodeHandle)
Given a namespace handle, return the prefix that the namespace decl is mapping. Given a node handle, return the prefix used to map to the namespace.

%REVIEW% Are you sure you want "" for no prefix?

%REVIEW-COMMENT% I think so... not totally sure. -sb

Specified by:
getPrefix in interface DTM
Overrides:
getPrefix in interface DTMDefaultBase

Parameters:
nodeHandle - the id of the node.

Returns:
String prefix of this node's name, or "" if no explicit namespace prefix was given.


getSourceLocatorFor

public SourceLocator getSourceLocatorFor(int node)
No source information is available for DOM2DTM, so return null here.
Specified by:
getSourceLocatorFor in interface DTM

Parameters:
node - an int value

Returns:
null


getStringValue

public XMLString getStringValue(int nodeHandle)
Get the string-value of a node as a String object (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
Specified by:
getStringValue in interface DTM
Overrides:
getStringValue in interface DTMDefaultBase

Parameters:
nodeHandle - The node ID.

Returns:
A string object that represents the string-value of the given node.


getUnparsedEntityURI

public String getUnparsedEntityURI(String name)
The getUnparsedEntityURI function returns the URI of the unparsed entity with the specified name in the same document as the context node (see [3.3 Unparsed Entities]). It returns the empty string if there is no such entity.

XML processors may choose to use the System Identifier (if one is provided) to resolve the entity, rather than the URI in the Public Identifier. The details are dependent on the processor, and we would have to support some form of plug-in resolver to handle this properly. Currently, we simply return the System Identifier if present, and hope that it a usable URI or that our caller can map it to one. TODO: Resolve Public Identifiers... or consider changing function name.

If we find a relative URI reference, XML expects it to be resolved in terms of the base URI of the document. The DOM doesn't do that for us, and it isn't entirely clear whether that should be done here; currently that's pushed up to a higher level of our application. (Note that DOM Level 1 didn't store the document's base URI.) TODO: Consider resolving Relative URIs.

(The DOM's statement that "An XML processor may choose to completely expand entities before the structure model is passed to the DOM" refers only to parsed entities, not unparsed, and hence doesn't affect this function.)

Specified by:
getUnparsedEntityURI in interface DTM
Overrides:
getUnparsedEntityURI in interface DTMDefaultBase

Parameters:
name - A string containing the Entity Name of the unparsed entity.

Returns:
String containing the URI of the Unparsed Entity, or an empty string if no such entity exists.


isAttributeSpecified

public boolean isAttributeSpecified(int attributeHandle)
5. [specified] A flag indicating whether this attribute was actually specified in the start-tag of its element, or was defaulted from the DTD.
Specified by:
isAttributeSpecified in interface DTM
Overrides:
isAttributeSpecified in interface DTMDefaultBase

Parameters:

Returns:
true if the attribute was specified; false if it was defaulted.


isWhitespace

public boolean isWhitespace(int nodeHandle)
Determine if the string-value of a node is whitespace

Parameters:
nodeHandle - The node Handle.

Returns:
Return true if the given node is whitespace.


needsTwoThreads

public boolean needsTwoThreads()
Specified by:
needsTwoThreads in interface DTM

Returns:
true iff we're building this model incrementally (eg we're partnered with a IncrementalSAXSource) and thus require that the transformation and the parse run simultaneously. Guidance to the DTMManager.


setIncrementalSAXSource

public void setIncrementalSAXSource(IncrementalSAXSource source)
Bind an IncrementalSAXSource to this DTM. NOT RELEVANT for DOM2DTM, since we're wrapped around an existing DOM.

Parameters:
source - The IncrementalSAXSource that we want to recieve events from on demand.


setProperty

public void setProperty(String property,
                        Object value)
For the moment all the run time properties are ignored by this class.
Specified by:
setProperty in interface DTM

Parameters:
property - a String value
value - an Object value


Copyright B) 2004 Apache XML Project. All Rights Reserved.