http://xml.apache.org/xalan-j/: Serializer to write out XML, HTML etc. as a stream of characters from an input DOM or from input SAX events. (The Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: DTMManagerDefault.java 468653 2006-10-28 07:07:05Z minchau $
 */
package org.apache.xml.dtm.ref;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;

import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMException;
import org.apache.xml.dtm.DTMFilter;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.dtm.DTMManager;
import org.apache.xml.dtm.DTMWSFilter;
import org.apache.xml.dtm.ref.dom2dtm.DOM2DTM;
import org.apache.xml.dtm.ref.sax2dtm.SAX2DTM;
import org.apache.xml.dtm.ref.sax2dtm.SAX2RTFDTM;
import org.apache.xml.res.XMLErrorResources;
import org.apache.xml.res.XMLMessages;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xml.utils.SystemIDResolver;
import org.apache.xml.utils.XMLReaderManager;
import org.apache.xml.utils.XMLStringFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;


The default implementation for the DTMManager.
%REVIEW% There is currently a reentrancy issue, since the finalizer
for XRTreeFrag (which runs in the GC thread) wants to call
DTMManager.release(), and may do so at the same time that the main
transformation thread is accessing the manager. Our current solution is
to make most of the manager's methods synchronized.
Early tests suggest that doing so is not causing a significant
performance hit in Xalan. However, it should be noted that there
is a possible alternative solution: rewrite release() so it merely
posts a request for release onto a threadsafe queue, and explicitly
process that queue on an infrequent basis during main-thread
activity (eg, when getDTM() is invoked). The downside of that solution
would be a greater delay before the DTM's storage is actually released
for reuse.

/**
 * The default implementation for the DTMManager.
 *
 * %REVIEW% There is currently a reentrancy issue, since the finalizer
 * for XRTreeFrag (which runs in the GC thread) wants to call
 * DTMManager.release(), and may do so at the same time that the main
 * transformation thread is accessing the manager. Our current solution is
 * to make most of the manager's methods <code>synchronized</code>.
 * Early tests suggest that doing so is not causing a significant
 * performance hit in Xalan. However, it should be noted that there
 * is a possible alternative solution: rewrite release() so it merely
 * posts a request for release onto a threadsafe queue, and explicitly
 * process that queue on an infrequent basis during main-thread
 * activity (eg, when getDTM() is invoked). The downside of that solution
 * would be a greater delay before the DTM's storage is actually released
 * for reuse.
 * */
public class DTMManagerDefault extends DTMManager
{
  //static final boolean JKESS_XNI_EXPERIMENT=true;

  
Set this to true if you want a dump of the DTM after creation. 
/** Set this to true if you want a dump of the DTM after creation. */
  private static final boolean DUMPTREE = false;

  
Set this to true if you want a basic diagnostics. 
/** Set this to true if you want a basic diagnostics. */
  private static final boolean DEBUG = false;

  
Map from DTM identifier numbers to DTM objects that this manager manages.
One DTM may have several prefix numbers, if extended node indexing
is in use; in that case, m_dtm_offsets[] will used to control which
prefix maps to which section of the DTM.
This array grows as necessary; see addDTM().
This array grows as necessary; see addDTM(). Growth is uncommon... but
access needs to be blindingly fast since it's used in node addressing.

/**
   * Map from DTM identifier numbers to DTM objects that this manager manages.
   * One DTM may have several prefix numbers, if extended node indexing
   * is in use; in that case, m_dtm_offsets[] will used to control which
   * prefix maps to which section of the DTM.
   * 
   * This array grows as necessary; see addDTM().
   * 
   * This array grows as necessary; see addDTM(). Growth is uncommon... but
   * access needs to be blindingly fast since it's used in node addressing.
   */
  protected DTM m_dtms[] = new DTM[256];
	
  
Map from DTM identifier numbers to offsets. For small DTMs with a 
single identifier, this will always be 0. In overflow addressing, where
additional identifiers are allocated to access nodes beyond the range of
a single Node Handle, this table is used to map the handle's node field
into the actual node identifier.
This array grows as necessary; see addDTM().
This array grows as necessary; see addDTM(). Growth is uncommon... but
access needs to be blindingly fast since it's used in node addressing.
(And at the moment, that includes accessing it from DTMDefaultBase,
which is why this is not Protected or Private.)

/** Map from DTM identifier numbers to offsets. For small DTMs with a 
   * single identifier, this will always be 0. In overflow addressing, where
   * additional identifiers are allocated to access nodes beyond the range of
   * a single Node Handle, this table is used to map the handle's node field
   * into the actual node identifier.
   * 
   * This array grows as necessary; see addDTM().
   * 
   * This array grows as necessary; see addDTM(). Growth is uncommon... but
   * access needs to be blindingly fast since it's used in node addressing.
   * (And at the moment, that includes accessing it from DTMDefaultBase,
   * which is why this is not Protected or Private.)
   */
  int m_dtm_offsets[] = new int[256];

  
The cache for XMLReader objects to be used if the user did not
supply an XMLReader for a SAXSource or supplied a StreamSource.

/**
   * The cache for XMLReader objects to be used if the user did not
   * supply an XMLReader for a SAXSource or supplied a StreamSource.
   */
  protected XMLReaderManager m_readerManager = null;
  
  
The default implementation of ContentHandler, DTDHandler and ErrorHandler.

/**
   * The default implementation of ContentHandler, DTDHandler and ErrorHandler.
   */
  protected DefaultHandler m_defaultHandler = new DefaultHandler();

  
Add a DTM to the DTM table. This convenience call adds it as the 
"base DTM ID", with offset 0. The other version of addDTM should 
be used if you want to add "extended" DTM IDs with nonzero offsets.

Params:
  • dtm – Should be a valid reference to a DTM.
  • id – Integer DTM ID to be bound to this DTM
/**
   * Add a DTM to the DTM table. This convenience call adds it as the 
   * "base DTM ID", with offset 0. The other version of addDTM should 
   * be used if you want to add "extended" DTM IDs with nonzero offsets.
   *
   * @param dtm Should be a valid reference to a DTM.
   * @param id Integer DTM ID to be bound to this DTM
   */
  synchronized public void addDTM(DTM dtm, int id) {	addDTM(dtm,id,0); }

	
  
Add a DTM to the DTM table.

Params:
  • dtm – Should be a valid reference to a DTM.
  • id – Integer DTM ID to be bound to this DTM.
  • offset – Integer addressing offset. The internal DTM Node ID is
obtained by adding this offset to the node-number field of the 
public DTM Handle. For the first DTM ID accessing each DTM, this is 0;
for overflow addressing it will be a multiple of 1<
/**
   * Add a DTM to the DTM table.
   *
   * @param dtm Should be a valid reference to a DTM.
   * @param id Integer DTM ID to be bound to this DTM.
   * @param offset Integer addressing offset. The internal DTM Node ID is
   * obtained by adding this offset to the node-number field of the 
   * public DTM Handle. For the first DTM ID accessing each DTM, this is 0;
   * for overflow addressing it will be a multiple of 1<<IDENT_DTM_NODE_BITS.
   */
  synchronized public void addDTM(DTM dtm, int id, int offset)
  {
		if(id>=IDENT_MAX_DTMS)
		{
			// TODO: %REVIEW% Not really the right error message.
	    throw new DTMException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_DTMIDS_AVAIL, null)); //"No more DTM IDs are available!");			 
		}
		
		// We used to just allocate the array size to IDENT_MAX_DTMS.
		// But we expect to increase that to 16 bits, and I'm not willing
		// to allocate that much space unless needed. We could use one of our
		// handy-dandy Fast*Vectors, but this will do for now.
		// %REVIEW%
		int oldlen=m_dtms.length;
		if(oldlen<=id)
		{
			// Various growth strategies are possible. I think we don't want 
			// to over-allocate excessively, and I'm willing to reallocate
			// more often to get that. See also Fast*Vector classes.
			//
			// %REVIEW% Should throw a more diagnostic error if we go over the max...
			int newlen=Math.min((id+256),IDENT_MAX_DTMS);

			DTM new_m_dtms[] = new DTM[newlen];
			System.arraycopy(m_dtms,0,new_m_dtms,0,oldlen);
			m_dtms=new_m_dtms;
			int new_m_dtm_offsets[] = new int[newlen];
			System.arraycopy(m_dtm_offsets,0,new_m_dtm_offsets,0,oldlen);
			m_dtm_offsets=new_m_dtm_offsets;
		}
		
    m_dtms[id] = dtm;
		m_dtm_offsets[id]=offset;
    dtm.documentRegistration();
		// The DTM should have been told who its manager was when we created it.
		// Do we need to allow for adopting DTMs _not_ created by this manager?
  }

  
Get the first free DTM ID available. %OPT% Linear search is inefficient!

/**
   * Get the first free DTM ID available. %OPT% Linear search is inefficient!
   */
  synchronized public int getFirstFreeDTMID()
  {
    int n = m_dtms.length;
    for (int i = 1; i < n; i++)
    {
      if(null == m_dtms[i])
      {
        return i;
      }
    }
		return n; // count on addDTM() to throw exception if out of range
  }

  
The default table for exandedNameID lookups.

/**
   * The default table for exandedNameID lookups.
   */
  private ExpandedNameTable m_expandedNameTable =
    new ExpandedNameTable();

  
Constructor DTMManagerDefault

/**
   * Constructor DTMManagerDefault
   *
   */
  public DTMManagerDefault(){}


  
Get an instance of a DTM, loaded with the content from the
specified source.  If the unique flag is true, a new instance will
always be returned.  Otherwise it is up to the DTMManager to return a
new instance or an instance that it already created and may be being used
by someone else.
A bit of magic in this implementation: If the source is null, unique is true,
and incremental and doIndexing are both false, we return an instance of
SAX2RTFDTM, which see.
(I think more parameters will need to be added for error handling, and entity
resolution, and more explicit control of the RTF situation).

Params:
  • source – the specification of the source object.
  • unique – true if the returned DTM must be unique, probably because it
is going to be mutated.
  • whiteSpaceFilter – Enables filtering of whitespace nodes, and may
                        be null.
  • incremental – true if the DTM should be built incrementally, if
                   possible.
  • doIndexing – true if the caller considers it worth it to use
                  indexing schemes.
Returns:a non-null DTM reference.
/**
   * Get an instance of a DTM, loaded with the content from the
   * specified source.  If the unique flag is true, a new instance will
   * always be returned.  Otherwise it is up to the DTMManager to return a
   * new instance or an instance that it already created and may be being used
   * by someone else.
   * 
   * A bit of magic in this implementation: If the source is null, unique is true,
   * and incremental and doIndexing are both false, we return an instance of
   * SAX2RTFDTM, which see.
   * 
   * (I think more parameters will need to be added for error handling, and entity
   * resolution, and more explicit control of the RTF situation).
   *
   * @param source the specification of the source object.
   * @param unique true if the returned DTM must be unique, probably because it
   * is going to be mutated.
   * @param whiteSpaceFilter Enables filtering of whitespace nodes, and may
   *                         be null.
   * @param incremental true if the DTM should be built incrementally, if
   *                    possible.
   * @param doIndexing true if the caller considers it worth it to use
   *                   indexing schemes.
   *
   * @return a non-null DTM reference.
   */
  synchronized public DTM getDTM(Source source, boolean unique,
                                 DTMWSFilter whiteSpaceFilter,
                                 boolean incremental, boolean doIndexing)
  {

    if(DEBUG && null != source)
      System.out.println("Starting "+
                         (unique ? "UNIQUE" : "shared")+
                         " source: "+source.getSystemId()
                         );

    XMLStringFactory xstringFactory = m_xsf;
    int dtmPos = getFirstFreeDTMID();
    int documentID = dtmPos << IDENT_DTM_NODE_BITS;

    if ((null != source) && source instanceof DOMSource)
    {
      DOM2DTM dtm = new DOM2DTM(this, (DOMSource) source, documentID,
                                whiteSpaceFilter, xstringFactory, doIndexing);

      addDTM(dtm, dtmPos, 0);

      //      if (DUMPTREE)
      //      {
      //        dtm.dumpDTM();
      //      }

      return dtm;
    }
    else
    {
      boolean isSAXSource = (null != source)
        ? (source instanceof SAXSource) : true;
      boolean isStreamSource = (null != source)
        ? (source instanceof StreamSource) : false;

      if (isSAXSource || isStreamSource) {
        XMLReader reader = null;
        SAX2DTM dtm;

        try {
          InputSource xmlSource;

          if (null == source) {
            xmlSource = null;
          } else {
            reader = getXMLReader(source);
            xmlSource = SAXSource.sourceToInputSource(source);

            String urlOfSource = xmlSource.getSystemId();

            if (null != urlOfSource) {
              try {
                urlOfSource = SystemIDResolver.getAbsoluteURI(urlOfSource);
              } catch (Exception e) {
                // %REVIEW% Is there a better way to send a warning?
                System.err.println("Can not absolutize URL: " + urlOfSource);
              }

              xmlSource.setSystemId(urlOfSource);
            }
          }

          if (source==null && unique && !incremental && !doIndexing) {
            // Special case to support RTF construction into shared DTM.
            // It should actually still work for other uses,
            // but may be slightly deoptimized relative to the base
            // to allow it to deal with carrying multiple documents.
            //
            // %REVIEW% This is a sloppy way to request this mode;
            // we need to consider architectural improvements.
            dtm = new SAX2RTFDTM(this, source, documentID, whiteSpaceFilter,
                                 xstringFactory, doIndexing);
          }
          /**************************************************************
          // EXPERIMENTAL 3/22/02
          else if(JKESS_XNI_EXPERIMENT && m_incremental) {        	
            dtm = new XNI2DTM(this, source, documentID, whiteSpaceFilter,
                              xstringFactory, doIndexing);
          }
          **************************************************************/
          // Create the basic SAX2DTM.
          else {
            dtm = new SAX2DTM(this, source, documentID, whiteSpaceFilter,
                              xstringFactory, doIndexing);
          }

          // Go ahead and add the DTM to the lookup table.  This needs to be
          // done before any parsing occurs. Note offset 0, since we've just
          // created a new DTM.
          addDTM(dtm, dtmPos, 0);


          boolean haveXercesParser =
                     (null != reader)
                     && (reader.getClass()
                               .getName()
                               .equals("org.apache.xerces.parsers.SAXParser") );
        
          if (haveXercesParser) {
            incremental = true;  // No matter what.  %REVIEW%
          }
        
          // If the reader is null, but they still requested an incremental
          // build, then we still want to set up the IncrementalSAXSource stuff.
          if (m_incremental && incremental
               /* || ((null == reader) && incremental) */) {
            IncrementalSAXSource coParser=null;

            if (haveXercesParser) {
              // IncrementalSAXSource_Xerces to avoid threading.
              try {
                coParser =(IncrementalSAXSource)
                  Class.forName("org.apache.xml.dtm.ref.IncrementalSAXSource_Xerces").newInstance();  
              }  catch( Exception ex ) {
                ex.printStackTrace();
                coParser=null;
              }
            }

            if (coParser==null ) {
              // Create a IncrementalSAXSource to run on the secondary thread.
              if (null == reader) {
                coParser = new IncrementalSAXSource_Filter();
              } else {
                IncrementalSAXSource_Filter filter =
                         new IncrementalSAXSource_Filter();
                filter.setXMLReader(reader);
                coParser=filter;
              }
            }

			
            /**************************************************************
            // EXPERIMENTAL 3/22/02
            if (JKESS_XNI_EXPERIMENT && m_incremental &&
                  dtm instanceof XNI2DTM && 
                  coParser instanceof IncrementalSAXSource_Xerces) {
                org.apache.xerces.xni.parser.XMLPullParserConfiguration xpc=
                      ((IncrementalSAXSource_Xerces)coParser)
                                           .getXNIParserConfiguration();
              if (xpc!=null) {
                // Bypass SAX; listen to the XNI stream
                ((XNI2DTM)dtm).setIncrementalXNISource(xpc);
              } else {
                  // Listen to the SAX stream (will fail, diagnostically...)
                dtm.setIncrementalSAXSource(coParser);
              }
            } else
            ***************************************************************/
          
            // Have the DTM set itself up as IncrementalSAXSource's listener.
            dtm.setIncrementalSAXSource(coParser);

            if (null == xmlSource) {

              // Then the user will construct it themselves.
              return dtm;
            }

            if (null == reader.getErrorHandler()) {
              reader.setErrorHandler(dtm);
            }
            reader.setDTDHandler(dtm);

            try {
              // Launch parsing coroutine.  Launches a second thread,
              // if we're using IncrementalSAXSource.filter().

              coParser.startParse(xmlSource);
            } catch (RuntimeException re) {

              dtm.clearCoRoutine();

              throw re;
            } catch (Exception e) {

              dtm.clearCoRoutine();

              throw new org.apache.xml.utils.WrappedRuntimeException(e);
            }
          } else {
            if (null == reader) {

              // Then the user will construct it themselves.
              return dtm;
            }

            // not incremental
            reader.setContentHandler(dtm);
            reader.setDTDHandler(dtm);
            if (null == reader.getErrorHandler()) {
              reader.setErrorHandler(dtm);
            }

            try {
              reader.setProperty(
                               "http://xml.org/sax/properties/lexical-handler",
                               dtm);
            } catch (SAXNotRecognizedException e){}
              catch (SAXNotSupportedException e){}

            try {
              reader.parse(xmlSource);
            } catch (RuntimeException re) {
              dtm.clearCoRoutine();

              throw re;
            } catch (Exception e) {
              dtm.clearCoRoutine();

              throw new org.apache.xml.utils.WrappedRuntimeException(e);
            }
          }

          if (DUMPTREE) {
            System.out.println("Dumping SAX2DOM");
            dtm.dumpDTM(System.err);
          }

          return dtm;
        } finally {
          // Reset the ContentHandler, DTDHandler, ErrorHandler to the DefaultHandler
          // after creating the DTM.
          if (reader != null && !(m_incremental && incremental)) {
            reader.setContentHandler(m_defaultHandler);
            reader.setDTDHandler(m_defaultHandler);
            reader.setErrorHandler(m_defaultHandler);
            
            // Reset the LexicalHandler to null after creating the DTM.
            try {
              reader.setProperty("http://xml.org/sax/properties/lexical-handler", null);
            }
            catch (Exception e) {}
          }
          releaseXMLReader(reader);
        }
      } else {

        // It should have been handled by a derived class or the caller
        // made a mistake.
        throw new DTMException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NOT_SUPPORTED, new Object[]{source})); //"Not supported: " + source);
      }
    }
  }

  
Given a W3C DOM node, try and return a DTM handle.
Note: calling this may be non-optimal, and there is no guarantee that
the node will be found in any particular DTM.

Params:
  • node – Non-null reference to a DOM node.
Returns:a valid DTM handle.
/**
   * Given a W3C DOM node, try and return a DTM handle.
   * Note: calling this may be non-optimal, and there is no guarantee that
   * the node will be found in any particular DTM.
   *
   * @param node Non-null reference to a DOM node.
   *
   * @return a valid DTM handle.
   */
  synchronized public int getDTMHandleFromNode(org.w3c.dom.Node node)
  {
    if(null == node)
      throw new IllegalArgumentException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NODE_NON_NULL, null)); //"node must be non-null for getDTMHandleFromNode!");

    if (node instanceof org.apache.xml.dtm.ref.DTMNodeProxy)
      return ((org.apache.xml.dtm.ref.DTMNodeProxy) node).getDTMNodeNumber();
		
    else
    {
      // Find the DOM2DTMs wrapped around this Document (if any)
      // and check whether they contain the Node in question.
      //
      // NOTE that since a DOM2DTM may represent a subtree rather
      // than a full document, we have to be prepared to check more
      // than one -- and there is no guarantee that we will find
      // one that contains ancestors or siblings of the node we're
      // seeking.
      //
      // %REVIEW% We could search for the one which contains this
      // node at the deepest level, and thus covers the widest
      // subtree, but that's going to entail additional work
      // checking more DTMs... and getHandleOfNode is not a
      // cheap operation in most implementations.
			//
			// TODO: %REVIEW% If overflow addressing, we may recheck a DTM
			// already examined. Ouch. But with the increased number of DTMs,
			// scanning back to check this is painful. 
			// POSSIBLE SOLUTIONS: 
			//   Generate a list of _unique_ DTM objects?
			//   Have each DTM cache last DOM node search?
			int max = m_dtms.length;
      for(int i = 0; i < max; i++)
        {
          DTM thisDTM=m_dtms[i];
          if((null != thisDTM) && thisDTM instanceof DOM2DTM)
          {
            int handle=((DOM2DTM)thisDTM).getHandleOfNode(node);
            if(handle!=DTM.NULL) return handle;
          }
         }

			// Not found; generate a new DTM.
			//
			// %REVIEW% Is this really desirable, or should we return null
			// and make folks explicitly instantiate from a DOMSource? The
			// latter is more work but gives the caller the opportunity to
			// explicitly add the DTM to a DTMManager... and thus to know when
			// it can be discarded again, which is something we need to pay much
			// more attention to. (Especially since only DTMs which are assigned
			// to a manager can use the overflow addressing scheme.)
			//
			// %BUG% If the source node was a DOM2DTM$defaultNamespaceDeclarationNode
			// and the DTM wasn't registered with this DTMManager, we will create
			// a new DTM and _still_ not be able to find the node (since it will
			// be resynthesized). Another reason to push hard on making all DTMs
			// be managed DTMs.

			// Since the real root of our tree may be a DocumentFragment, we need to
      // use getParent to find the root, instead of getOwnerDocument.  Otherwise
      // DOM2DTM#getHandleOfNode will be very unhappy.
      Node root = node;
      Node p = (root.getNodeType() == Node.ATTRIBUTE_NODE) ? ((org.w3c.dom.Attr)root).getOwnerElement() : root.getParentNode();
      for (; p != null; p = p.getParentNode())
      {
        root = p;
      }

      DOM2DTM dtm = (DOM2DTM) getDTM(new javax.xml.transform.dom.DOMSource(root),
																		 false, null, true, true);

      int handle;
      
      if(node instanceof org.apache.xml.dtm.ref.dom2dtm.DOM2DTMdefaultNamespaceDeclarationNode)
      {
				// Can't return the same node since it's unique to a specific DTM, 
				// but can return the equivalent node -- find the corresponding 
				// Document Element, then ask it for the xml: namespace decl.
				handle=dtm.getHandleOfNode(((org.w3c.dom.Attr)node).getOwnerElement());
				handle=dtm.getAttributeNode(handle,node.getNamespaceURI(),node.getLocalName());
      }
      else
				handle = ((DOM2DTM)dtm).getHandleOfNode(node);

      if(DTM.NULL == handle)
        throw new RuntimeException(XMLMessages.createXMLMessage(XMLErrorResources.ER_COULD_NOT_RESOLVE_NODE, null)); //"Could not resolve the node to a handle!");

      return handle;
    }
  }

  
This method returns the SAX2 parser to use with the InputSource
obtained from this URI.
It may return null if any SAX2-conformant XML parser can be used,
or if getInputSource() will also return null. The parser must
be free for use (i.e., not currently in use for another parse().
After use of the parser is completed, the releaseXMLReader(XMLReader)
must be called.

Params:
  • inputSource – The value returned from the URIResolver.
Returns: a SAX2 XMLReader to use to resolve the inputSource argument.
Returns:non-null XMLReader reference ready to parse.
/**
   * This method returns the SAX2 parser to use with the InputSource
   * obtained from this URI.
   * It may return null if any SAX2-conformant XML parser can be used,
   * or if getInputSource() will also return null. The parser must
   * be free for use (i.e., not currently in use for another parse().
   * After use of the parser is completed, the releaseXMLReader(XMLReader)
   * must be called.
   *
   * @param inputSource The value returned from the URIResolver.
   * @return  a SAX2 XMLReader to use to resolve the inputSource argument.
   *
   * @return non-null XMLReader reference ready to parse.
   */
  synchronized public XMLReader getXMLReader(Source inputSource)
  {

    try
    {
      XMLReader reader = (inputSource instanceof SAXSource)
                         ? ((SAXSource) inputSource).getXMLReader() : null;

      // If user did not supply a reader, ask for one from the reader manager
      if (null == reader) {
        if (m_readerManager == null) {
            m_readerManager = XMLReaderManager.getInstance();
        }

        reader = m_readerManager.getXMLReader();
      }

      return reader;

    } catch (SAXException se) {
      throw new DTMException(se.getMessage(), se);
    }
  }

  
Indicates that the XMLReader object is no longer in use for the transform.
Note that the getXMLReader method may return an XMLReader that was
specified on the SAXSource object by the application code.  Such a
reader should still be passed to releaseXMLReader, but the reader manager
will only re-use XMLReaders that it created.

Params:
  • reader – The XMLReader to be released.
/**
   * Indicates that the XMLReader object is no longer in use for the transform.
   *
   * Note that the getXMLReader method may return an XMLReader that was
   * specified on the SAXSource object by the application code.  Such a
   * reader should still be passed to releaseXMLReader, but the reader manager
   * will only re-use XMLReaders that it created.
   *
   * @param reader The XMLReader to be released.
   */
  synchronized public void releaseXMLReader(XMLReader reader) {
    if (m_readerManager != null) {
      m_readerManager.releaseXMLReader(reader);
    }
  }

  
Return the DTM object containing a representation of this node.

Params:
  • nodeHandle – DTM Handle indicating which node to retrieve
Returns:a reference to the DTM object containing this node.
/**
   * Return the DTM object containing a representation of this node.
   *
   * @param nodeHandle DTM Handle indicating which node to retrieve
   *
   * @return a reference to the DTM object containing this node.
   */
  synchronized public DTM getDTM(int nodeHandle)
  {
    try
    {
      // Performance critical function.
      return m_dtms[nodeHandle >>> IDENT_DTM_NODE_BITS];
    }
    catch(java.lang.ArrayIndexOutOfBoundsException e)
    {
      if(nodeHandle==DTM.NULL)
				return null;		// Accept as a special case.
      else
				throw e;		// Programming error; want to know about it.
    }    
  }

  
Given a DTM, find the ID number in the DTM tables which addresses
the start of the document. If overflow addressing is in use, other
DTM IDs may also be assigned to this DTM.

Params:
  • dtm – The DTM which (hopefully) contains this node.
Returns:The DTM ID (as the high bits of a NodeHandle, not as our
internal index), or -1 if the DTM doesn't belong to this manager.
/**
   * Given a DTM, find the ID number in the DTM tables which addresses
   * the start of the document. If overflow addressing is in use, other
   * DTM IDs may also be assigned to this DTM.
   *
   * @param dtm The DTM which (hopefully) contains this node.
   *
   * @return The DTM ID (as the high bits of a NodeHandle, not as our
   * internal index), or -1 if the DTM doesn't belong to this manager.
   */
  synchronized public int getDTMIdentity(DTM dtm)
  {
	// Shortcut using DTMDefaultBase's extension hooks
	// %REVIEW% Should the lookup be part of the basic DTM API?
	if(dtm instanceof DTMDefaultBase)
	{
		DTMDefaultBase dtmdb=(DTMDefaultBase)dtm;
		if(dtmdb.getManager()==this)
			return dtmdb.getDTMIDs().elementAt(0);
		else
			return -1;
	}
				
    int n = m_dtms.length;

    for (int i = 0; i < n; i++)
    {
      DTM tdtm = m_dtms[i];

      if (tdtm == dtm && m_dtm_offsets[i]==0)
        return i << IDENT_DTM_NODE_BITS;
    }

    return -1;
  }

  
Release the DTMManager's reference(s) to a DTM, making it unmanaged.
This is typically done as part of returning the DTM to the heap after
we're done with it.

Params:
  • dtm – the DTM to be released.
  • shouldHardDelete – If false, this call is a suggestion rather than an
order, and we may not actually release the DTM. This is intended to 
support intelligent caching of documents... which is not implemented
in this version of the DTM manager.
Returns:true if the DTM was released, false if shouldHardDelete was set
and we decided not to.
/**
   * Release the DTMManager's reference(s) to a DTM, making it unmanaged.
   * This is typically done as part of returning the DTM to the heap after
   * we're done with it.
   *
   * @param dtm the DTM to be released.
   * 
   * @param shouldHardDelete If false, this call is a suggestion rather than an
   * order, and we may not actually release the DTM. This is intended to 
   * support intelligent caching of documents... which is not implemented
   * in this version of the DTM manager.
   *
   * @return true if the DTM was released, false if shouldHardDelete was set
   * and we decided not to.
   */
  synchronized public boolean release(DTM dtm, boolean shouldHardDelete)
  {
    if(DEBUG)
    {
      System.out.println("Releasing "+
			 (shouldHardDelete ? "HARD" : "soft")+
			 " dtm="+
			 // Following shouldn't need a nodeHandle, but does...
			 // and doesn't seem to report the intended value
			 dtm.getDocumentBaseURI()
			 );
    }

    if (dtm instanceof SAX2DTM)
    {
      ((SAX2DTM) dtm).clearCoRoutine();
    }

		// Multiple DTM IDs may be assigned to a single DTM. 
		// The Right Answer is to ask which (if it supports
		// extension, the DTM will need a list anyway). The 
		// Wrong Answer, applied if the DTM can't help us,
		// is to linearly search them all; this may be very
		// painful.
		//
		// %REVIEW% Should the lookup move up into the basic DTM API?
		if(dtm instanceof DTMDefaultBase)
		{
			org.apache.xml.utils.SuballocatedIntVector ids=((DTMDefaultBase)dtm).getDTMIDs();
			for(int i=ids.size()-1;i>=0;--i)
				m_dtms[ids.elementAt(i)>>>DTMManager.IDENT_DTM_NODE_BITS]=null;
		}
		else
		{
			int i = getDTMIdentity(dtm);
		    if (i >= 0)
			{
				m_dtms[i >>> DTMManager.IDENT_DTM_NODE_BITS] = null;
			}
		}

    dtm.documentRelease();
    return true;
  }

  
Method createDocumentFragment
NEEDSDOC (createDocumentFragment) @return

/**
   * Method createDocumentFragment
   *
   *
   * NEEDSDOC (createDocumentFragment) @return
   */
  synchronized public DTM createDocumentFragment()
  {

    try
    {
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

      dbf.setNamespaceAware(true);

      DocumentBuilder db = dbf.newDocumentBuilder();
      Document doc = db.newDocument();
      Node df = doc.createDocumentFragment();

      return getDTM(new DOMSource(df), true, null, false, false);
    }
    catch (Exception e)
    {
      throw new DTMException(e);
    }
  }

  
NEEDSDOC Method createDTMIterator
NEEDSDOC @param whatToShow
NEEDSDOC @param filter
NEEDSDOC @param entityReferenceExpansion
NEEDSDOC (createDTMIterator) @return

/**
   * NEEDSDOC Method createDTMIterator
   *
   *
   * NEEDSDOC @param whatToShow
   * NEEDSDOC @param filter
   * NEEDSDOC @param entityReferenceExpansion
   *
   * NEEDSDOC (createDTMIterator) @return
   */
  synchronized public DTMIterator createDTMIterator(int whatToShow, DTMFilter filter,
                                       boolean entityReferenceExpansion)
  {

    /** @todo: implement this org.apache.xml.dtm.DTMManager abstract method */
    return null;
  }

  
NEEDSDOC Method createDTMIterator
NEEDSDOC @param xpathString
NEEDSDOC @param presolver
NEEDSDOC (createDTMIterator) @return

/**
   * NEEDSDOC Method createDTMIterator
   *
   *
   * NEEDSDOC @param xpathString
   * NEEDSDOC @param presolver
   *
   * NEEDSDOC (createDTMIterator) @return
   */
  synchronized public DTMIterator createDTMIterator(String xpathString,
                                       PrefixResolver presolver)
  {

    /** @todo: implement this org.apache.xml.dtm.DTMManager abstract method */
    return null;
  }

  
NEEDSDOC Method createDTMIterator
NEEDSDOC @param node
NEEDSDOC (createDTMIterator) @return

/**
   * NEEDSDOC Method createDTMIterator
   *
   *
   * NEEDSDOC @param node
   *
   * NEEDSDOC (createDTMIterator) @return
   */
  synchronized public DTMIterator createDTMIterator(int node)
  {

    /** @todo: implement this org.apache.xml.dtm.DTMManager abstract method */
    return null;
  }

  
NEEDSDOC Method createDTMIterator
NEEDSDOC @param xpathCompiler
NEEDSDOC @param pos
NEEDSDOC (createDTMIterator) @return

/**
   * NEEDSDOC Method createDTMIterator
   *
   *
   * NEEDSDOC @param xpathCompiler
   * NEEDSDOC @param pos
   *
   * NEEDSDOC (createDTMIterator) @return
   */
  synchronized public DTMIterator createDTMIterator(Object xpathCompiler, int pos)
  {

    /** @todo: implement this org.apache.xml.dtm.DTMManager abstract method */
    return null;
  }

  
return the expanded name table.
NEEDSDOC @param dtm
NEEDSDOC ($objectName$) @return

/**
   * return the expanded name table.
   *
   * NEEDSDOC @param dtm
   *
   * NEEDSDOC ($objectName$) @return
   */
  public ExpandedNameTable getExpandedNameTable(DTM dtm)
  {
    return m_expandedNameTable;
  }
}