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	/*
	* Copyright (c) 2005, 2019, Oracle and/or its affiliates. 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.org.apache.xalan.internal.xsltc.trax;

	import java.io.IOException;
	import org.xml.sax.Attributes;
	import org.xml.sax.ContentHandler;
	import org.xml.sax.DTDHandler;
	import org.xml.sax.EntityResolver;
	import org.xml.sax.ErrorHandler;
	import org.xml.sax.InputSource;
	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.LexicalHandler;
	import org.xml.sax.ext.Locator2;
	import org.xml.sax.helpers.AttributesImpl;
	import com.sun.org.apache.xalan.internal.xsltc.dom.SAXImpl;



	import javax.xml.namespace.QName;
	import javax.xml.stream.XMLStreamReader;
	import javax.xml.stream.XMLStreamConstants;
	import javax.xml.stream.XMLStreamException;



	/**
	* @author Padmaja Vedula
	* @author Sunitha Reddy
	*/
	public class StAXStream2SAX implements XMLReader, Locator {

	//private final static String EMPTYSTRING = "";
	//private static final String XMLNS_PREFIX = "xmlns";

	// StAX Stream source
	private final XMLStreamReader staxStreamReader;

	//private Node _dom = null;
	private ContentHandler _sax = null;
	private LexicalHandler _lex = null;
	private SAXImpl _saxImpl = null;

	public StAXStream2SAX(XMLStreamReader staxSrc) {
	staxStreamReader = staxSrc;
	}

	public ContentHandler getContentHandler() {
	return _sax;
	}

	public void setContentHandler(ContentHandler handler) throws
	NullPointerException
	{
	_sax = handler;
	if (handler instanceof LexicalHandler) {
	_lex = (LexicalHandler) handler;
	}

	if (handler instanceof SAXImpl) {
	_saxImpl = (SAXImpl)handler;
	}
	}


	public void parse(InputSource unused) throws IOException, SAXException {
	try {
	bridge();
	} catch (XMLStreamException e) {
	throw new SAXException(e);
	}
	}


	//Main Work Starts Here.
	public void parse() throws IOException, SAXException, XMLStreamException {
	bridge();
	}


	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void parse(String sysId) throws IOException, SAXException {
	throw new IOException("This method is not yet implemented.");
	}


	public void bridge() throws XMLStreamException {

	try {
	// remembers the nest level of elements to know when we are done.
	int depth=0;
	boolean startedAtDocument = false;

	// skip over START_DOCUMENT
	int event = staxStreamReader.getEventType();
	if (event == XMLStreamConstants.START_DOCUMENT) {
	startedAtDocument = true;
	event = staxStreamReader.next();
	}

	handleStartDocument();

	// Handle the prolog: http://www.w3.org/TR/REC-xml/#NT-prolog
	while (event != XMLStreamConstants.START_ELEMENT) {
	switch (event) {
	case XMLStreamConstants.CHARACTERS :
	handleCharacters();
	break;
	case XMLStreamConstants.PROCESSING_INSTRUCTION :
	handlePI();
	break;
	case XMLStreamConstants.COMMENT :
	handleComment();
	break;
	case XMLStreamConstants.DTD :
	handleDTD();
	break;
	case XMLStreamConstants.SPACE :
	handleSpace();
	break;
	default :
	throw new InternalError("processing prolog event: " + event);
	}
	event=staxStreamReader.next();
	}

	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);

	if (startedAtDocument) {
	// Handle the Misc (http://www.w3.org/TR/REC-xml/#NT-Misc) that can follow the document element
	while (event != XMLStreamConstants.END_DOCUMENT) {
	switch (event) {
	case XMLStreamConstants.CHARACTERS :
	handleCharacters();
	break;
	case XMLStreamConstants.PROCESSING_INSTRUCTION :
	handlePI();
	break;
	case XMLStreamConstants.COMMENT :
	handleComment();
	break;
	case XMLStreamConstants.SPACE :
	handleSpace();
	break;
	default :
	throw new InternalError("processing misc event after document element: " + event);
	}
	event=staxStreamReader.next();
	}
	}

	handleEndDocument();
	} catch (SAXException e) {
	throw new XMLStreamException(e);
	}
	}

	private void handleEndDocument() throws SAXException {
	_sax.endDocument();
	}

	private void handleStartDocument() throws SAXException {
	_sax.setDocumentLocator(new Locator2() {
	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();
	}
	public String getXMLVersion() {
	return staxStreamReader.getVersion();
	}
	public String getEncoding() {
	return staxStreamReader.getEncoding();
	}
	});
	_sax.startDocument();
	}

	private void handlePI() throws XMLStreamException {
	try {
	_sax.processingInstruction(
	staxStreamReader.getPITarget(),
	staxStreamReader.getPIData());
	} catch (SAXException e) {
	throw new XMLStreamException(e);
	}
	}

	private void handleCharacters() throws XMLStreamException {

	// workaround for bugid 5046319 - switch over to commented section
	// below when it is fixed.
	int textLength = staxStreamReader.getTextLength();
	char[] chars = new char[textLength];

	staxStreamReader.getTextCharacters(0, chars, 0, textLength);

	try {
	_sax.characters(chars, 0, chars.length);
	} catch (SAXException e) {
	throw new XMLStreamException(e);
	}


	// int start = 0;
	// int len;
	// do {
	// len = staxStreamReader.getTextCharacters(start, buf, 0, buf.length);
	// start += len;
	// try {
	// _sax.characters(buf, 0, len);
	// } catch (SAXException e) {
	// throw new XMLStreamException(e);
	// }
	// } while (len == buf.length);
	}

	private void handleEndElement() throws XMLStreamException {
	QName qName = staxStreamReader.getName();

	try {
	//construct prefix:localName from qName
	String qname = "";
	if (qName.getPrefix() != null && qName.getPrefix().trim().length() != 0){
	qname = qName.getPrefix() + ":";
	}
	qname += qName.getLocalPart();

	// fire endElement
	_sax.endElement(
	qName.getNamespaceURI(),
	qName.getLocalPart(),
	qname);

	// 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 = "";
	}
	_sax.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++) {
	String prefix = staxStreamReader.getNamespacePrefix(i);
	if (prefix == null) { // true for default namespace
	prefix = "";
	}
	String uri = staxStreamReader.getNamespaceURI(i);
	if (uri == null && prefix.isEmpty()) { // true for default namespace
	uri = "";
	}

	_sax.startPrefixMapping(prefix, uri);
	}

	// 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();
	_sax.startElement(
	qName.getNamespaceURI(),
	qName.getLocalPart(),
	rawname,
	attrs);
	} catch (SAXException e) {
	throw new XMLStreamException(e);
	}
	}

	/**
	* 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.
	}


	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public DTDHandler getDTDHandler() {
	return null;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public ErrorHandler getErrorHandler() {
	return null;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public boolean getFeature(String name) throws SAXNotRecognizedException,
	SAXNotSupportedException
	{
	return false;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void setFeature(String name, boolean value) throws
	SAXNotRecognizedException, SAXNotSupportedException
	{
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void setDTDHandler(DTDHandler handler) throws NullPointerException {
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void setEntityResolver(EntityResolver resolver) throws
	NullPointerException
	{
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public EntityResolver getEntityResolver() {
	return null;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void setErrorHandler(ErrorHandler handler) throws
	NullPointerException
	{
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public void setProperty(String name, Object value) throws
	SAXNotRecognizedException, SAXNotSupportedException {
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public Object getProperty(String name) throws SAXNotRecognizedException,
	SAXNotSupportedException
	{
	return null;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public int getColumnNumber() {
	return 0;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public int getLineNumber() {
	return 0;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public String getPublicId() {
	return null;
	}

	/**
	* This class is only used internally so this method should never
	* be called.
	*/
	public String getSystemId() {
	return null;
	}

	}

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