| /* |
| * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.tools.internal.xjc.util; |
| |
| import javax.xml.namespace.QName; |
| import javax.xml.stream.XMLStreamConstants; |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.Locator; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.helpers.AttributesImpl; |
| |
| /** |
| * This is a simple utility class that adapts StAX events from an |
| * {@link javax.xml.stream.XMLStreamReader} to SAX events on a |
| * {@link org.xml.sax.ContentHandler}, bridging between the two |
| * parser technologies. |
| * |
| * @author Ryan.Shoemaker@Sun.COM |
| */ |
| public class XMLStreamReaderToContentHandler { |
| |
| // StAX event source |
| private final XMLStreamReader staxStreamReader; |
| |
| // SAX event sink |
| private final ContentHandler saxHandler; |
| |
| /** |
| * Construct a new StAX to SAX adapter that will convert a StAX event |
| * stream into a SAX event stream. |
| * |
| * @param staxCore |
| * StAX event source |
| * @param saxCore |
| * SAXevent sink |
| */ |
| public XMLStreamReaderToContentHandler(XMLStreamReader staxCore, ContentHandler saxCore) { |
| staxStreamReader = staxCore; |
| saxHandler = saxCore; |
| } |
| |
| /* |
| * @see StAXReaderToContentHandler#bridge() |
| */ |
| public void bridge() throws XMLStreamException { |
| |
| try { |
| // remembers the nest level of elements to know when we are done. |
| int depth=0; |
| |
| // if the parser is at the start tag, proceed to the first element |
| int event = staxStreamReader.getEventType(); |
| if(event == XMLStreamConstants.START_DOCUMENT) { |
| // nextTag doesn't correctly handle DTDs |
| while( !staxStreamReader.isStartElement() ) |
| event = staxStreamReader.next(); |
| } |
| |
| |
| if( event!=XMLStreamConstants.START_ELEMENT) |
| throw new IllegalStateException("The current event is not START_ELEMENT\n but " + event); |
| |
| handleStartDocument(); |
| |
| do { |
| // These are all of the events listed in the javadoc for |
| // XMLEvent. |
| // The spec only really describes 11 of them. |
| switch (event) { |
| case XMLStreamConstants.START_ELEMENT : |
| depth++; |
| handleStartElement(); |
| break; |
| case XMLStreamConstants.END_ELEMENT : |
| handleEndElement(); |
| depth--; |
| break; |
| case XMLStreamConstants.CHARACTERS : |
| handleCharacters(); |
| break; |
| case XMLStreamConstants.ENTITY_REFERENCE : |
| handleEntityReference(); |
| break; |
| case XMLStreamConstants.PROCESSING_INSTRUCTION : |
| handlePI(); |
| break; |
| case XMLStreamConstants.COMMENT : |
| handleComment(); |
| break; |
| case XMLStreamConstants.DTD : |
| handleDTD(); |
| break; |
| case XMLStreamConstants.ATTRIBUTE : |
| handleAttribute(); |
| break; |
| case XMLStreamConstants.NAMESPACE : |
| handleNamespace(); |
| break; |
| case XMLStreamConstants.CDATA : |
| handleCDATA(); |
| break; |
| case XMLStreamConstants.ENTITY_DECLARATION : |
| handleEntityDecl(); |
| break; |
| case XMLStreamConstants.NOTATION_DECLARATION : |
| handleNotationDecl(); |
| break; |
| case XMLStreamConstants.SPACE : |
| handleSpace(); |
| break; |
| default : |
| throw new InternalError("processing event: " + event); |
| } |
| |
| event=staxStreamReader.next(); |
| } while (depth!=0); |
| |
| handleEndDocument(); |
| } catch (SAXException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| private void handleEndDocument() throws SAXException { |
| saxHandler.endDocument(); |
| } |
| |
| private void handleStartDocument() throws SAXException { |
| saxHandler.setDocumentLocator(new Locator() { |
| public int getColumnNumber() { |
| return staxStreamReader.getLocation().getColumnNumber(); |
| } |
| public int getLineNumber() { |
| return staxStreamReader.getLocation().getLineNumber(); |
| } |
| public String getPublicId() { |
| return staxStreamReader.getLocation().getPublicId(); |
| } |
| public String getSystemId() { |
| return staxStreamReader.getLocation().getSystemId(); |
| } |
| }); |
| saxHandler.startDocument(); |
| } |
| |
| private void handlePI() throws XMLStreamException { |
| try { |
| saxHandler.processingInstruction( |
| staxStreamReader.getPITarget(), |
| staxStreamReader.getPIData()); |
| } catch (SAXException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| private void handleCharacters() throws XMLStreamException { |
| try { |
| saxHandler.characters( |
| staxStreamReader.getTextCharacters(), |
| staxStreamReader.getTextStart(), |
| staxStreamReader.getTextLength() ); |
| } catch (SAXException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| private void handleEndElement() throws XMLStreamException { |
| QName qName = staxStreamReader.getName(); |
| |
| try { |
| // fire endElement |
| saxHandler.endElement( |
| qName.getNamespaceURI(), |
| qName.getLocalPart(), |
| qName.toString()); |
| |
| // end namespace bindings |
| int nsCount = staxStreamReader.getNamespaceCount(); |
| for (int i = nsCount - 1; i >= 0; i--) { |
| String prefix = staxStreamReader.getNamespacePrefix(i); |
| if (prefix == null) { // true for default namespace |
| prefix = ""; |
| } |
| saxHandler.endPrefixMapping(prefix); |
| } |
| } catch (SAXException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| private void handleStartElement() throws XMLStreamException { |
| |
| try { |
| // start namespace bindings |
| int nsCount = staxStreamReader.getNamespaceCount(); |
| for (int i = 0; i < nsCount; i++) { |
| saxHandler.startPrefixMapping( |
| fixNull(staxStreamReader.getNamespacePrefix(i)), |
| fixNull(staxStreamReader.getNamespaceURI(i))); |
| } |
| |
| // fire startElement |
| QName qName = staxStreamReader.getName(); |
| String prefix = qName.getPrefix(); |
| String rawname; |
| if(prefix==null || prefix.length()==0) |
| rawname = qName.getLocalPart(); |
| else |
| rawname = prefix + ':' + qName.getLocalPart(); |
| Attributes attrs = getAttributes(); |
| saxHandler.startElement( |
| qName.getNamespaceURI(), |
| qName.getLocalPart(), |
| rawname, |
| attrs); |
| } catch (SAXException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| private static String fixNull(String s) { |
| if(s==null) return ""; |
| else return s; |
| } |
| |
| /** |
| * Get the attributes associated with the given START_ELEMENT or ATTRIBUTE |
| * StAXevent. |
| * |
| * @return the StAX attributes converted to an org.xml.sax.Attributes |
| */ |
| private Attributes getAttributes() { |
| AttributesImpl attrs = new AttributesImpl(); |
| |
| int eventType = staxStreamReader.getEventType(); |
| if (eventType != XMLStreamConstants.ATTRIBUTE |
| && eventType != XMLStreamConstants.START_ELEMENT) { |
| throw new InternalError( |
| "getAttributes() attempting to process: " + eventType); |
| } |
| |
| // in SAX, namespace declarations are not part of attributes by default. |
| // (there's a property to control that, but as far as we are concerned |
| // we don't use it.) So don't add xmlns:* to attributes. |
| |
| // gather non-namespace attrs |
| for (int i = 0; i < staxStreamReader.getAttributeCount(); i++) { |
| String uri = staxStreamReader.getAttributeNamespace(i); |
| if(uri==null) uri=""; |
| String localName = staxStreamReader.getAttributeLocalName(i); |
| String prefix = staxStreamReader.getAttributePrefix(i); |
| String qName; |
| if(prefix==null || prefix.length()==0) |
| qName = localName; |
| else |
| qName = prefix + ':' + localName; |
| String type = staxStreamReader.getAttributeType(i); |
| String value = staxStreamReader.getAttributeValue(i); |
| |
| attrs.addAttribute(uri, localName, qName, type, value); |
| } |
| |
| return attrs; |
| } |
| |
| private void handleNamespace() { |
| // no-op ??? |
| // namespace events don't normally occur outside of a startElement |
| // or endElement |
| } |
| |
| private void handleAttribute() { |
| // no-op ??? |
| // attribute events don't normally occur outside of a startElement |
| // or endElement |
| } |
| |
| private void handleDTD() { |
| // no-op ??? |
| // it seems like we need to pass this info along, but how? |
| } |
| |
| private void handleComment() { |
| // no-op ??? |
| } |
| |
| private void handleEntityReference() { |
| // no-op ??? |
| } |
| |
| private void handleSpace() { |
| // no-op ??? |
| // this event is listed in the javadoc, but not in the spec. |
| } |
| |
| private void handleNotationDecl() { |
| // no-op ??? |
| // this event is listed in the javadoc, but not in the spec. |
| } |
| |
| private void handleEntityDecl() { |
| // no-op ??? |
| // this event is listed in the javadoc, but not in the spec. |
| } |
| |
| private void handleCDATA() { |
| // no-op ??? |
| // this event is listed in the javadoc, but not in the spec. |
| } |
| } |