saxeventsink.java

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/* SAXEventSink.java -- 
   Copyright (C) 1999,2000,2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package gnu.xml.dom.ls;

import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import javax.xml.XMLConstants;
import org.w3c.dom.Attr;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.Entity;
import org.w3c.dom.EntityReference;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.Attributes2;
import org.xml.sax.ext.DeclHandler;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.ext.Locator2;
import gnu.xml.dom.DomAttr;
import gnu.xml.dom.DomDocument;
import gnu.xml.dom.DomDoctype;
import gnu.xml.dom.DomNode;

/**
 * A SAX content and lexical handler used to construct a DOM document.
 *
 * @author <a href='mailto:[e-mail]'>Chris Burdess</a>
 */
class SAXEventSink
  implements ContentHandler, LexicalHandler, DTDHandler, DeclHandler
{

  private static final String XMLNS_URI = XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
  private static final String XMLNS_PREFIX = XMLConstants.XMLNS_ATTRIBUTE;
  private static final HashSet PREDEFINED_ENTITIES = new HashSet();
  static
  {
    PREDEFINED_ENTITIES.add("amp");
    PREDEFINED_ENTITIES.add("lt");
    PREDEFINED_ENTITIES.add("gt");
    PREDEFINED_ENTITIES.add("quot");
    PREDEFINED_ENTITIES.add("apos");
  }

  boolean namespaceAware;
  boolean ignoreWhitespace;
  boolean expandEntityReferences;
  boolean ignoreComments;
  boolean coalescing;

  XMLReader reader; // reference back to the parser to get features
  
  DomDocument doc; // document being constructed
  Node ctx; // current context (parent node)
  LinkedList entityCtx; // entity context
  List pending; // namespace nodes waiting for a declaring element
  Locator locator;
  boolean inCDATA;
  boolean inDTD;
  boolean interrupted;

  void interrupt()
  {
    interrupted = true;
  }

  // -- ContentHandler2 --
  
  public void setDocumentLocator(Locator locator)
  {
    this.locator = locator;
  }

  public void startDocument()
    throws SAXException
  {
    if (namespaceAware)
      {
        pending = new LinkedList();
      }
    doc = new DomDocument();
    doc.setStrictErrorChecking(false);
    doc.setBuilding(true);
    ctx = doc;

    final String FEATURES = "http://xml.org/sax/features/";
    final String PROPERTIES = "http://xml.org/sax/properties/";
    final String GNU_PROPERTIES = "http://gnu.org/sax/properties/";

    boolean standalone = reader.getFeature(FEATURES + "is-standalone");
    doc.setXmlStandalone(standalone);
    try
      {
        String version = (String) reader.getProperty(PROPERTIES +
                                                     "document-xml-version");
        doc.setXmlVersion(version);
      }
    catch (SAXNotRecognizedException e)
      {
      }
    catch (SAXNotSupportedException e)
      {
      }
    if (locator != null && locator instanceof Locator2)
      {
        String encoding = ((Locator2) locator).getEncoding();
        doc.setInputEncoding(encoding);
      }
    try
      {
        String encoding = (String) reader.getProperty(GNU_PROPERTIES +
                                                      "document-xml-encoding");
        doc.setXmlEncoding(encoding);
      }
    catch (SAXNotRecognizedException e)
      {
      }
    catch (SAXNotSupportedException e)
      {
      }
  }

  public void endDocument()
    throws SAXException
  {
    doc.setStrictErrorChecking(true);
    doc.setBuilding(false);
    DomDoctype doctype = (DomDoctype) doc.getDoctype();
    if (doctype != null)
      {
        doctype.makeReadonly();
      }
    ctx = null;
    locator = null;
  }

  public void startPrefixMapping(String prefix, String uri)
    throws SAXException
  {
    if (namespaceAware)
      {
        String nsName = (prefix != null && prefix.length() > 0) ?
          XMLNS_PREFIX + ":" + prefix : XMLNS_PREFIX;
        DomAttr ns = (DomAttr) doc.createAttributeNS(XMLNS_URI, nsName);
        ns.setNodeValue(uri);
        if (ctx.getNodeType() == Node.ATTRIBUTE_NODE)
          {
            // Add to owner element
            Node target = ((Attr) ctx).getOwnerElement();
            target.getAttributes().setNamedItemNS(ns);
          }
        else
          {
            // Add to pending list; namespace node will be inserted when
            // element is seen
            pending.add(ns);
          }
      }
  }

  public void endPrefixMapping(String prefix)
    throws SAXException
  {
  }

  public void startElement(String uri, String localName, String qName,
                           Attributes atts)
    throws SAXException
  {
    if (interrupted)
      {
        return;
      }
    Element element = createElement(uri, localName, qName, atts);
    // add element to context
    ctx.appendChild(element);
    ctx = element;
  }

  protected Element createElement(String uri, String localName, String qName,
                                  Attributes atts)
    throws SAXException
  {
    // create element node
    Element element = namespaceAware ?
      doc.createElementNS(uri, qName) :
      doc.createElement(qName);
    NamedNodeMap attrs = element.getAttributes();
    if (namespaceAware && !pending.isEmpty())
      {
        // add pending namespace nodes
        for (Iterator i = pending.iterator(); i.hasNext(); )
          {
            Node ns = (Node) i.next();
            attrs.setNamedItemNS(ns);
          }
        pending.clear();
      }
    // add attributes
    int len = atts.getLength();
    for (int i = 0; i < len; i++)
      {
        // create attribute
        Attr attr = createAttr(atts, i);
        if (attr != null)
          {
            // add attribute to element
            if (namespaceAware)
              {
                attrs.setNamedItemNS(attr);
              }
            else
              {
                attrs.setNamedItem(attr);
              }
          }
      }
    return element;
  }

  protected Attr createAttr(Attributes atts, int index)
  {
    DomAttr attr;
    if (namespaceAware)
      {
        String a_uri = atts.getURI(index);
        String a_qName = atts.getQName(index);
        attr = (DomAttr) doc.createAttributeNS(a_uri, a_qName);
      }
    else
      {
        String a_qName = atts.getQName(index);
        attr = (DomAttr) doc.createAttribute(a_qName);
      }
    attr.setNodeValue(atts.getValue(index));
    if (atts instanceof Attributes2)
      {
        Attributes2 atts2 = (Attributes2) atts;
        // TODO attr.setDeclared(atts2.isDeclared(index));
        attr.setSpecified(atts2.isSpecified(index));
      }
    return attr;
  }

  public void endElement(String uri, String localName, String qName)
    throws SAXException