org.apache.xml.dtm.ref.sax2dtm

## Class SAX2DTM2

- java.lang.Object
- - org.apache.xml.dtm.ref.DTMDefaultBase
  - - org.apache.xml.dtm.ref.DTMDefaultBaseTraversers
    - - org.apache.xml.dtm.ref.DTMDefaultBaseIterators
      - - org.apache.xml.dtm.ref.sax2dtm.SAX2DTM
        - - org.apache.xml.dtm.ref.sax2dtm.SAX2DTM2

- All Implemented Interfaces:
    DTM, org.xml.sax.ContentHandler, org.xml.sax.DTDHandler, org.xml.sax.EntityResolver, org.xml.sax.ErrorHandler, org.xml.sax.ext.DeclHandler, org.xml.sax.ext.LexicalHandler
  Direct Known Subclasses:
    SAXImpl

      public class SAX2DTM2
      extends SAX2DTM

  SAX2DTM2 is an optimized version of SAX2DTM which is used in non-incremental situation. It is used as the super class of the XSLTC SAXImpl. Many of the interfaces in SAX2DTM and DTMDefaultBase are overridden in SAX2DTM2 in order to allow fast, efficient access to the DTM model. Some nested iterators in DTMDefaultBaseIterators are also overridden in SAX2DTM2 for performance reasons.

  Performance is the biggest consideration in the design of SAX2DTM2. To make the code most efficient, the incremental support is dropped in SAX2DTM2, which means that you should not use it in incremental situation. To reduce the overhead of pulling data from the DTM model, a few core interfaces in SAX2DTM2 have direct access to the internal arrays of the SuballocatedIntVectors.

  The design of SAX2DTM2 may limit its extensibilty. If you have a reason to extend the SAX2DTM model, please extend from SAX2DTM instead of this class.

  TODO: This class is currently only used by XSLTC. We need to investigate the possibility of also using it in Xalan-J Interpretive. Xalan's performance is likely to get an instant boost if we use SAX2DTM2 instead of SAX2DTM in non-incremental case.

  %MK% The code in this class is critical to the XSLTC_DTM performance. Be very careful when making changes here!

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `class` | `SAX2DTM2.AncestorIterator` Iterator that returns the ancestors of a given node in document order.
    `class` | `SAX2DTM2.AttributeIterator` Iterator that returns attribute nodes (of what nodes?)
    `class` | `SAX2DTM2.ChildrenIterator` Iterator that returns all immediate children of a given node
    `class` | `SAX2DTM2.DescendantIterator` Iterator that returns the descendants of a given node.
    `class` | `SAX2DTM2.FollowingIterator` Iterator that returns following nodes of for a given node.
    `class` | `SAX2DTM2.FollowingSiblingIterator` Iterator that returns all siblings of a given node.
    `class` | `SAX2DTM2.ParentIterator` Iterator that returns the parent of a given node.
    `class` | `SAX2DTM2.PrecedingIterator` Iterator that returns preceding nodes of a given node.
    `class` | `SAX2DTM2.PrecedingSiblingIterator` Iterator that returns preceding siblings of a given node
    `class` | `SAX2DTM2.TypedAncestorIterator` Typed iterator that returns the ancestors of a given node.
    `class` | `SAX2DTM2.TypedAttributeIterator` Iterator that returns attribute nodes of a given type
    `class` | `SAX2DTM2.TypedChildrenIterator` Iterator that returns children of a given type for a given node.
    `class` | `SAX2DTM2.TypedDescendantIterator` Typed iterator that returns the descendants of a given node.
    `class` | `SAX2DTM2.TypedFollowingIterator` Iterator that returns following nodes of a given type for a given node.
    `class` | `SAX2DTM2.TypedFollowingSiblingIterator` Iterator that returns all following siblings of a given node.
    `class` | `SAX2DTM2.TypedPrecedingIterator` Iterator that returns preceding nodes of agiven type for a given node.
    `class` | `SAX2DTM2.TypedPrecedingSiblingIterator` Iterator that returns preceding siblings of a given type for a given node
    `class` | `SAX2DTM2.TypedRootIterator` Iterator that returns the namespace nodes as defined by the XPath data model for a given node, filtered by extended type ID.
    `class` | `SAX2DTM2.TypedSingletonIterator` Iterator that returns a given node only if it is of a given type.

    - ### Nested classes/interfaces inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseIterators

      `DTMDefaultBaseIterators.InternalAxisIteratorBase, DTMDefaultBaseIterators.NamespaceAttributeIterator, DTMDefaultBaseIterators.NamespaceChildrenIterator, DTMDefaultBaseIterators.NamespaceIterator, DTMDefaultBaseIterators.NthDescendantIterator, DTMDefaultBaseIterators.RootIterator, DTMDefaultBaseIterators.SingletonIterator, DTMDefaultBaseIterators.TypedNamespaceIterator`

  - ### Field Summary

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

      `DEFAULT_BLOCKSIZE, DEFAULT_NUMBLOCKS, DEFAULT_NUMBLOCKS_SMALL, m_mgr, ROOTNODE`

    - ### 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

    Constructors
    Constructor and Description
    `SAX2DTM2(DTMManager mgr, javax.xml.transform.Source source, int dtmIdentity, DTMWSFilter whiteSpaceFilter, XMLStringFactory xstringfactory, boolean doIndexing)` Construct a SAX2DTM2 object using the default block size.
    `SAX2DTM2(DTMManager mgr, javax.xml.transform.Source source, int dtmIdentity, DTMWSFilter whiteSpaceFilter, XMLStringFactory xstringfactory, boolean doIndexing, int blocksize, boolean usePrevsib, boolean buildIdIndex, boolean newNameTable)` Construct a SAX2DTM2 object using the given block size.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `_exptype(int identity)` Override DTMDefaultBase.
    `int` | `_exptype2(int identity)` The optimized version of DTMDefaultBase.
    `int` | `_exptype2Type(int exptype)` Return the node type from the expanded type
    `int` | `_firstch2(int identity)` The optimized version of DTMDefaultBase.
    `int` | `_nextsib2(int identity)` The optimized version of DTMDefaultBase.
    `int` | `_parent2(int identity)` The optimized version of DTMDefaultBase.
    `int` | `_type2(int identity)` The optimized version of DTMDefaultBase.
    `void` | `comment(char[] ch, int start, int length)` Report an XML comment anywhere in the document.
    `void` | `dispatchCharactersEvents(int nodeHandle, org.xml.sax.ContentHandler ch, boolean normalize)` The optimized version of SAX2DTM.dispatchCharactersEvents(int, ContentHandler, boolean).
    `void` | `endDocument()` Receive notification of the end of the document.
    `void` | `endElement(java.lang.String uri, java.lang.String localName, java.lang.String qName)` Receive notification of the end of an element.
    `int` | `getExpandedTypeID2(int nodeHandle)` The optimized version of DTMDefaultBase.getExpandedTypeID(int).
    `int` | `getFirstAttribute(int nodeHandle)` The optimized version of DTMDefaultBase.getFirstAttribute().
    `int` | `getIdForNamespace(java.lang.String uri)` Get a prefix either from the uri mapping, or just make one up!
    `java.lang.String` | `getLocalName(int nodeHandle)` Override SAX2DTM.getLocalName() in SAX2DTM2.
    `java.lang.String` | `getNodeName(int nodeHandle)` The optimized version of SAX2DTM.getNodeName().
    `java.lang.String` | `getNodeNameX(int nodeHandle)` The optimized version of SAX2DTM.getNodeNameX().
    `java.lang.String` | `getNodeValue(int nodeHandle)` Given a node handle, return its node value.
    `java.lang.String` | `getStringValue()` Returns the string value of the entire tree
    `XMLString` | `getStringValue(int nodeHandle)` Override SAX2DTM.getStringValue(int) This method is only used by Xalan-J Interpretive.
    `java.lang.String` | `getStringValueX(int nodeHandle)` The optimized version of SAX2DTM.getStringValue(int).
    `void` | `processingInstruction(java.lang.String target, java.lang.String data)` Override the processingInstruction() interface in SAX2DTM2.
    `void` | `startDocument()` Receive notification of the beginning of the document.
    `void` | `startElement(java.lang.String uri, java.lang.String localName, java.lang.String qName, org.xml.sax.Attributes attributes)` Override SAX2DTM.startElement() Receive notification of the start of an element.

    - ### Methods inherited from class org.apache.xml.dtm.ref.sax2dtm.SAX2DTM

      `attributeDecl, characters, clearCoRoutine, clearCoRoutine, dispatchToEvents, elementDecl, endCDATA, endDTD, endEntity, endPrefixMapping, error, externalEntityDecl, fatalError, getAttributeNode, getContentHandler, getDeclHandler, getDocumentTypeDeclarationPublicIdentifier, getDocumentTypeDeclarationSystemIdentifier, getDTDHandler, getElementById, getEntityResolver, getErrorHandler, getFixedNames, getLexicalHandler, getNamespaceURI, getNamespaceURI, getNumberOfNodes, getPrefix, getPrefix, getSourceLocatorFor, getUnparsedEntityURI, ignorableWhitespace, internalEntityDecl, isAttributeSpecified, isWhitespace, migrateTo, needsTwoThreads, notationDecl, resolveEntity, setDocumentLocator, setIDAttribute, setIncrementalSAXSource, setProperty, setUseSourceLocation, skippedEntity, startCDATA, startDTD, startEntity, startPrefixMapping, unparsedEntityDecl, warning`

    - ### 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, documentRegistration, documentRelease, dumpDTM, dumpNode, getDocument, getDocumentAllDeclarationsProcessed, getDocumentBaseURI, getDocumentEncoding, getDocumentRoot, getDocumentStandalone, getDocumentSystemIdentifier, getDocumentVersion, getDTMIDs, getExpandedTypeID, getExpandedTypeID, getFirstChild, getFirstNamespaceNode, getLastChild, getLevel, getLocalNameFromExpandedNameID, getManager, getNamespaceFromExpandedNameID, getNamespaceType, getNextAttribute, getNextNamespaceNode, getNextSibling, getNode, getNodeHandle, getNodeIdent, getNodeType, getOwnerDocument, getParent, getPreviousSibling, getStringValueChunk, getStringValueChunkCount, getTypedFirstChild, getTypedNextSibling, hasChildNodes, isCharacterElementContentWhitespace, isDocumentAllDeclarationsProcessed, isNodeAfter, isSupported, makeNodeHandle, makeNodeIdentity, setDocumentBaseURI, setFeature, supportsPreStripping`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SAX2DTM2

          public SAX2DTM2(DTMManager mgr,
                          javax.xml.transform.Source source,
                          int dtmIdentity,
                          DTMWSFilter whiteSpaceFilter,
                          XMLStringFactory xstringfactory,
                          boolean doIndexing)

      Construct a SAX2DTM2 object using the default block size.

    - #### SAX2DTM2

          public SAX2DTM2(DTMManager mgr,
                          javax.xml.transform.Source source,
                          int dtmIdentity,
                          DTMWSFilter whiteSpaceFilter,
                          XMLStringFactory xstringfactory,
                          boolean doIndexing,
                          int blocksize,
                          boolean usePrevsib,
                          boolean buildIdIndex,
                          boolean newNameTable)

      Construct a SAX2DTM2 object using the given block size.

  - ### Method Detail

    - #### _exptype

          public final int _exptype(int identity)

      Override DTMDefaultBase._exptype() by dropping the incremental code.

      This one is less efficient than _exptype2. It is only used during DTM building. _exptype2 is used after the document is fully built.

      Parameters:
        `identity` - The node identity.
      Returns:
        The expanded type ID, or DTM.NULL.

    - #### _exptype2

          public final int _exptype2(int identity)

      The optimized version of DTMDefaultBase._exptype().
      Parameters:
        `identity` - A node identity, which must not be equal to `DTM.NULL`

    - #### _nextsib2

          public final int _nextsib2(int identity)

      The optimized version of DTMDefaultBase._nextsib().
      Parameters:
        `identity` - A node identity, which must not be equal to `DTM.NULL`

    - #### _firstch2

          public final int _firstch2(int identity)

      The optimized version of DTMDefaultBase._firstch().
      Parameters:
        `identity` - A node identity, which must not be equal to `DTM.NULL`

    - #### _parent2

          public final int _parent2(int identity)

      The optimized version of DTMDefaultBase._parent().
      Parameters:
        `identity` - A node identity, which must not be equal to `DTM.NULL`

    - #### _type2

          public final int _type2(int identity)

      The optimized version of DTMDefaultBase._type().
      Parameters:
        `identity` - A node identity, which must not be equal to `DTM.NULL`

    - #### getExpandedTypeID2

          public final int getExpandedTypeID2(int nodeHandle)

      The optimized version of DTMDefaultBase.getExpandedTypeID(int).

      This one is only used by DOMAdapter.getExpandedTypeID(int), which is mostly called from the compiled translets.

    - #### _exptype2Type

          public final int _exptype2Type(int exptype)

      Return the node type from the expanded type

    - #### getIdForNamespace

          public int getIdForNamespace(java.lang.String uri)

      Get a prefix either from the uri mapping, or just make one up!
      Overrides:
        `getIdForNamespace` in class `SAX2DTM`
      Parameters:
        `uri` - The namespace URI, which may be null.
      Returns:
        The prefix if there is one, or null.

    - #### startElement

          public void startElement(java.lang.String uri,
                                   java.lang.String localName,
                                   java.lang.String qName,
                                   org.xml.sax.Attributes attributes)
                            throws org.xml.sax.SAXException

      Override SAX2DTM.startElement()

      Receive notification of the start of an element.

      By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).

      Specified by:
        `startElement` in interface `org.xml.sax.ContentHandler`
      Overrides:
        `startElement` in class `SAX2DTM`
      Parameters:
        `uri` - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.
        `localName` - The local name (without prefix), or the empty string if Namespace processing is not being performed.
        `qName` - The qualified name (with prefix), or the empty string if qualified names are not available.
        `attributes` - The specified or defaulted attributes.
      Throws:
        `org.xml.sax.SAXException` - Any SAX exception, possibly wrapping another exception.
      See Also:
        `ContentHandler.startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)`

    - #### endElement

          public void endElement(java.lang.String uri,
                                 java.lang.String localName,
                                 java.lang.String qName)
                          throws org.xml.sax.SAXException

      Receive notification of the end of an element.

      By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each element (such as finalising a tree node or writing output to a file).

      Specified by:
        `endElement` in interface `org.xml.sax.ContentHandler`
      Overrides:
        `endElement` in class `SAX2DTM`
      Parameters:
        `uri` - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.
        `localName` - The local name (without prefix), or the empty string if Namespace processing is not being performed.
        `qName` - The qualified XML 1.0 name (with prefix), or the empty string if qualified names are not available.
      Throws:
        `org.xml.sax.SAXException` - Any SAX exception, possibly wrapping another exception.
      See Also:
        `ContentHandler.endElement(java.lang.String, java.lang.String, java.lang.String)`

    - #### comment

          public void comment(char[] ch,
                              int start,
                              int length)
                       throws org.xml.sax.SAXException

      Report an XML comment anywhere in the document.

      This callback will be used for comments inside or outside the document element, including comments in the external DTD subset (if read).

      Specified by:
        `comment` in interface `org.xml.sax.ext.LexicalHandler`
      Overrides:
        `comment` in class `SAX2DTM`
      Parameters:
        `ch` - An array holding the characters in the comment.
        `start` - The starting position in the array.
        `length` - The number of characters to use from the array.
      Throws:
        `org.xml.sax.SAXException` - The application may raise an exception.

    - #### startDocument

          public void startDocument()
                             throws org.xml.sax.SAXException

      Receive notification of the beginning of the document.
      Specified by:
        `startDocument` in interface `org.xml.sax.ContentHandler`
      Overrides:
        `startDocument` in class `SAX2DTM`
      Throws:
        `org.xml.sax.SAXException` - Any SAX exception, possibly wrapping another exception.
      See Also:
        `ContentHandler.startDocument()`

    - #### endDocument

          public void endDocument()
                           throws org.xml.sax.SAXException

      Receive notification of the end of the document.
      Specified by:
        `endDocument` in interface `org.xml.sax.ContentHandler`
      Overrides:
        `endDocument` in class `SAX2DTM`
      Throws:
        `org.xml.sax.SAXException` - Any SAX exception, possibly wrapping another exception.
      See Also:
        `ContentHandler.endDocument()`

    - #### processingInstruction

          public void processingInstruction(java.lang.String target,
                                            java.lang.String data)
                                     throws org.xml.sax.SAXException

      Override the processingInstruction() interface in SAX2DTM2.

      %OPT% This one is different from SAX2DTM.processingInstruction() in that we do not use extended types for PI nodes. The name of the PI is saved in the DTMStringPool. Receive notification of a processing instruction.

      Specified by:
        `processingInstruction` in interface `org.xml.sax.ContentHandler`
      Overrides:
        `processingInstruction` in class `SAX2DTM`
      Parameters:
        `target` - The processing instruction target.
        `data` - The processing instruction data, or null if none is supplied.
      Throws:
        `org.xml.sax.SAXException` - Any SAX exception, possibly wrapping another exception.
      See Also:
        `ContentHandler.processingInstruction(java.lang.String, java.lang.String)`

    - #### getFirstAttribute

          public final int getFirstAttribute(int nodeHandle)

      The optimized version of DTMDefaultBase.getFirstAttribute().

      Given a node handle, get the index of the node's first attribute.

      Specified by:
        `getFirstAttribute` in interface `DTM`
      Overrides:
        `getFirstAttribute` in class `DTMDefaultBase`
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        Handle of first attribute, or DTM.NULL to indicate none exists.

    - #### getLocalName

          public java.lang.String getLocalName(int nodeHandle)

      Override SAX2DTM.getLocalName() in SAX2DTM2.

      Processing for PIs is different. 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 class `SAX2DTM`
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String Local name of this node.

    - #### getNodeNameX

          public final java.lang.String getNodeNameX(int nodeHandle)

      The optimized version of SAX2DTM.getNodeNameX().

      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 class `SAX2DTM`
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String Name of this node, which may be an empty string.

    - #### getNodeName

          public java.lang.String getNodeName(int nodeHandle)

      The optimized version of SAX2DTM.getNodeName().

      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 class `SAX2DTM`
      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?

    - #### getStringValue

          public XMLString getStringValue(int nodeHandle)

      Override SAX2DTM.getStringValue(int)

      This method is only used by Xalan-J Interpretive. It is not used by XSLTC.

      If the caller supplies an XMLStringFactory, the getStringValue() interface in SAX2DTM will be called. Otherwise just calls getStringValueX() and wraps the returned String in an XMLString. 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 class `SAX2DTM`
      Parameters:
        `nodeHandle` - The node ID.
      Returns:
        A string object that represents the string-value of the given node.

    - #### getStringValueX

          public final java.lang.String getStringValueX(int nodeHandle)

      The optimized version of SAX2DTM.getStringValue(int).

      %OPT% This is one of the most often used interfaces. Performance is critical here. This one is different from SAX2DTM.getStringValue(int) in that it returns a String instead of a XMLString. 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).

      Parameters:
        `nodeHandle` - The node ID.
      Returns:
        A string object that represents the string-value of the given node.

    - #### getStringValue

          public java.lang.String getStringValue()

      Returns the string value of the entire tree

    - #### dispatchCharactersEvents

          public final void dispatchCharactersEvents(int nodeHandle,
                                                     org.xml.sax.ContentHandler ch,
                                                     boolean normalize)
                                              throws org.xml.sax.SAXException

      The optimized version of SAX2DTM.dispatchCharactersEvents(int, ContentHandler, boolean).

      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 class `SAX2DTM`
      Parameters:
        `nodeHandle` - The node ID.
        `ch` - A non-null reference to a ContentHandler.
        `normalize` - true if the content should be normalized according to the rules for the XPath normalize-space function.
      Throws:
        `org.xml.sax.SAXException`

    - #### getNodeValue

          public java.lang.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 class `SAX2DTM`
      Parameters:
        `nodeHandle` - The node id.
      Returns:
        String Value of this node, or null if not meaningful for this node type.

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