/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999,2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xerces" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.html.dom;
import java.util.Vector;
import org.w3c.dom.*;
import org.w3c.dom.html.*;
import org.xml.sax.*;
import org.apache.xerces.dom.TextImpl;
import org.apache.xerces.dom.ElementImpl;
import org.apache.xerces.dom.ProcessingInstructionImpl;
/**
* This is a SAX document handler that is used to build an HTML document.
* It can build a document from any SAX parser, but is specifically tuned
* for working with the OpenXML HTML parser.
*
*
* @version $Revision: 1.3.4.1 $ $Date: 2001/02/14 18:28:49 $
* @author <a href="mailto:arkin@openxml.org">Assaf Arkin</a>
*/
public class HTMLBuilder
implements DocumentHandler
{
/**
* The document that is being built.
*/
protected HTMLDocumentImpl _document;
/**
* The current node in the document into which elements, text and
* other nodes will be inserted. This starts as the document iself
* and reflects each element that is currently being parsed.
*/
protected ElementImpl _current;
/**
* A reference to the current locator, this is generally the parser
* itself. The locator is used to locate errors and identify the
* source locations of elements.
*/
private Locator _locator;
/**
* Applies only to whitespace appearing between element tags in element content,
* as per the SAX definition, and true by default.
*/
private boolean _ignoreWhitespace = true;
/**
* Indicates whether finished building a document. If so, can start building
* another document. Must be initially true to get the first document processed.
*/
private boolean _done = true;
/**
* The document is only created the same time as the document element, however, certain
* nodes may precede the document element (comment and PI), and they are accumulated
* in this vector.
*/
protected Vector _preRootNodes;
public void startDocument()
throws SAXException
{
if ( ! _done )
throw new SAXException( "HTM001 State error: startDocument fired twice on one builder." );
_document = null;
_done = false;
}
public void endDocument()
throws SAXException
{
if ( _document == null )
throw new SAXException( "HTM002 State error: document never started or missing document element." );
if ( _current != null )
throw new SAXException( "HTM003 State error: document ended before end of document element." );
_current = null;
_done = true;
}
public synchronized void startElement( String tagName, AttributeList attrList )
throws SAXException
{
ElementImpl elem;
int i;
if ( tagName == null )
throw new SAXException( "HTM004 Argument 'tagName' is null." );
// If this is the root element, this is the time to create a new document,
// because only know we know the document element name and namespace URI.
if ( _document == null )
{
// No need to create the element explicitly.
_document = new HTMLDocumentImpl();
elem = (ElementImpl) _document.getDocumentElement();
_current = elem;
if ( _current == null )
throw new SAXException( "HTM005 State error: Document.getDocumentElement returns null." );
// Insert nodes (comment and PI) that appear before the root element.
if ( _preRootNodes != null )
{
for ( i = _preRootNodes.size() ; i-- > 0 ; )
_document.insertBefore( (Node) _preRootNodes.elementAt( i ), elem );
_preRootNodes = null;
}
}
else
{
// This is a state error, indicates that document has been parsed in full,
// or that there are two root elements.
if ( _current == null )
throw new SAXException( "HTM006 State error: startElement called after end of document element." );
elem = (ElementImpl) _document.createElement( tagName );
_current.appendChild( elem );
_current = elem;
}
// Add the attributes (specified and not-specified) to this element.
if ( attrList != null )
{
for ( i = 0 ; i < attrList.getLength() ; ++ i )
elem.setAttribute( attrList.getName( i ), attrList.getValue( i ) );
}
}
public void endElement( String tagName )
throws SAXException
{
if ( _current == null )
throw new SAXException( "HTM007 State error: endElement called with no current node." );
if ( ! _current.getNodeName().equals( tagName ) )
throw new SAXException( "HTM008 State error: mismatch in closing tag name " + tagName + "\n" + tagName);
// Move up to the parent element. When you reach the top (closing the root element).
// the parent is document and current is null.
if ( _current.getParentNode() == _current.getOwnerDocument() )
_current = null;
else
_current = (ElementImpl) _current.getParentNode();
}
public void characters( String text )
throws SAXException
{
if ( _current == null )
throw new SAXException( "HTM009 State error: character data found outside of root element." );
_current.appendChild( new TextImpl( _document, text ) );
}
public void characters( char[] text, int start, int length )
throws SAXException
{
if ( _current == null )
throw new SAXException( "HTM010 State error: character data found outside of root element." );
_current.appendChild( new TextImpl( _document, new String( text, start, length ) ) );
}
public void ignorableWhitespace( char[] text, int start, int length )
throws SAXException
{
Node node;
if ( ! _ignoreWhitespace )
_current.appendChild( new TextImpl( _document, new String( text, start, length ) ) );
}
public void processingInstruction( String target, String instruction )
throws SAXException
{
Node node;
// Processing instruction may appear before the document element (in fact, before the
// document has been created, or after the document element has been closed.
if ( _current == null && _document == null )
{
if ( _preRootNodes == null )
_preRootNodes = new Vector();
_preRootNodes.addElement( new ProcessingInstructionImpl( null, target, instruction ) );
}
else
if ( _current == null && _document != null )
_document.appendChild( new ProcessingInstructionImpl( _document, target, instruction ) );
else
_current.appendChild( new ProcessingInstructionImpl( _document, target, instruction ) );
}
public HTMLDocument getHTMLDocument()
{
return (HTMLDocument) _document;
}
public void setDocumentLocator( Locator locator )
{
_locator = locator;
}
}