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	/*
	* Copyright (c) 2012, 2018, 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 jdk.internal.util.xml.impl;

	import java.io.IOException;
	import java.io.InputStream;
	import jdk.internal.org.xml.sax.ContentHandler;
	import jdk.internal.org.xml.sax.DTDHandler;
	import jdk.internal.org.xml.sax.EntityResolver;
	import jdk.internal.org.xml.sax.ErrorHandler;
	import jdk.internal.org.xml.sax.InputSource;
	import jdk.internal.org.xml.sax.Locator;
	import jdk.internal.org.xml.sax.SAXException;
	import jdk.internal.org.xml.sax.SAXParseException;
	import jdk.internal.org.xml.sax.XMLReader;
	import jdk.internal.org.xml.sax.helpers.DefaultHandler;

	/**
	* XML non-validating push parser.
	* <p>
	* This non-validating parser conforms to <a href="http://www.w3.org/TR/REC-xml">
	* Extensible Markup Language (XML) 1.0</a> and
	* <a href="http://www.w3.org/TR/REC-xml-names" >Namespaces in XML</a>
	* specifications. The API supported by the parser are
	* <a href="https://www.oracle.com/technetwork/java/cldc-141990.html">CLDC</a> and
	* <a href="http://www.jcp.org/en/jsr/detail?id=280">JSR-280</a>, a JavaME subset of
	* <a href="https://www.oracle.com/technetwork/java/intro-140052.html">JAXP</a>
	* and <a href="http://www.saxproject.org/">SAX2</a>.
	*
	* @see org.xml.sax.XMLReader
	*/

	final class ParserSAX
	extends Parser implements XMLReader, Locator
	{
	public static final String FEATURE_NS =
	"http://xml.org/sax/features/namespaces";
	public static final String FEATURE_PREF =
	"http://xml.org/sax/features/namespace-prefixes";
	// SAX feature flags
	private boolean mFNamespaces;
	private boolean mFPrefixes;
	// SAX handlers
	private DefaultHandler mHand; // the default handler
	private ContentHandler mHandCont; // the content handler
	private DTDHandler mHandDtd; // the DTD handler
	private ErrorHandler mHandErr; // the error handler
	private EntityResolver mHandEnt; // the entity resolver

	/**
	* Constructor.
	*/
	public ParserSAX() {
	super();

	// SAX feature defaut values
	mFNamespaces = true;
	mFPrefixes = false;

	// Default handler which will be used in case the application
	// do not set one of handlers.
	mHand = new DefaultHandler();
	mHandCont = mHand;
	mHandDtd = mHand;
	mHandErr = mHand;
	mHandEnt = mHand;
	}

	/**
	* Return the current content handler.
	*
	* @return The current content handler, or null if none has been registered.
	* @see #setContentHandler
	*/
	public ContentHandler getContentHandler() {
	return (mHandCont != mHand) ? mHandCont : null;
	}

	/**
	* Allow an application to register a content event handler.
	*
	* <p>If the application does not register a content handler, all content
	* events reported by the SAX parser will be silently ignored.</p>
	*
	* <p>Applications may register a new or different handler in the middle of
	* a parse, and the SAX parser must begin using the new handler
	* immediately.</p>
	*
	* @param handler The content handler.
	* @exception java.lang.NullPointerException If the handler argument is
	* null.
	* @see #getContentHandler
	*/
	public void setContentHandler(ContentHandler handler) {
	if (handler == null) {
	throw new NullPointerException();
	}
	mHandCont = handler;
	}

	/**
	* Return the current DTD handler.
	*
	* @return The current DTD handler, or null if none has been registered.
	* @see #setDTDHandler
	*/
	public DTDHandler getDTDHandler() {
	return (mHandDtd != mHand) ? mHandDtd : null;
	}

	/**
	* Allow an application to register a DTD event handler.
	*
	* <p>If the application does not register a DTD handler, all DTD events
	* reported by the SAX parser will be silently ignored.</p>
	*
	* <p>Applications may register a new or different handler in the middle of
	* a parse, and the SAX parser must begin using the new handler
	* immediately.</p>
	*
	* @param handler The DTD handler.
	* @exception java.lang.NullPointerException If the handler argument is
	* null.
	* @see #getDTDHandler
	*/
	public void setDTDHandler(DTDHandler handler) {
	if (handler == null) {
	throw new NullPointerException();
	}
	mHandDtd = handler;
	}

	/**
	* Return the current error handler.
	*
	* @return The current error handler, or null if none has been registered.
	* @see #setErrorHandler
	*/
	public ErrorHandler getErrorHandler() {
	return (mHandErr != mHand) ? mHandErr : null;
	}

	/**
	* Allow an application to register an error event handler.
	*
	* <p>If the application does not register an error handler, all error
	* events reported by the SAX parser will be silently ignored; however,
	* normal processing may not continue. It is highly recommended that all SAX
	* applications implement an error handler to avoid unexpected bugs.</p>
	*
	* <p>Applications may register a new or different handler in the middle of
	* a parse, and the SAX parser must begin using the new handler
	* immediately.</p>
	*
	* @param handler The error handler.
	* @exception java.lang.NullPointerException If the handler argument is
	* null.
	* @see #getErrorHandler
	*/
	public void setErrorHandler(ErrorHandler handler) {
	if (handler == null) {
	throw new NullPointerException();
	}
	mHandErr = handler;
	}

	/**
	* Return the current entity resolver.
	*
	* @return The current entity resolver, or null if none has been registered.
	* @see #setEntityResolver
	*/
	public EntityResolver getEntityResolver() {
	return (mHandEnt != mHand) ? mHandEnt : null;
	}

	/**
	* Allow an application to register an entity resolver.
	*
	* <p>If the application does not register an entity resolver, the XMLReader
	* will perform its own default resolution.</p>
	*
	* <p>Applications may register a new or different resolver in the middle of
	* a parse, and the SAX parser must begin using the new resolver
	* immediately.</p>
	*
	* @param resolver The entity resolver.
	* @exception java.lang.NullPointerException If the resolver argument is
	* null.
	* @see #getEntityResolver
	*/
	public void setEntityResolver(EntityResolver resolver) {
	if (resolver == null) {
	throw new NullPointerException();
	}
	mHandEnt = resolver;
	}

	/**
	* Return the public identifier for the current document event.
	*
	* <p>The return value is the public identifier of the document entity or of
	* the external parsed entity in which the markup triggering the event
	* appears.</p>
	*
	* @return A string containing the public identifier, or null if none is
	* available.
	*
	* @see #getSystemId
	*/
	public String getPublicId() {
	return (mInp != null) ? mInp.pubid : null;
	}

	/**
	* Return the system identifier for the current document event.
	*
	* <p>The return value is the system identifier of the document entity or of
	* the external parsed entity in which the markup triggering the event
	* appears.</p>
	*
	* <p>If the system identifier is a URL, the parser must resolve it fully
	* before passing it to the application.</p>
	*
	* @return A string containing the system identifier, or null if none is
	* available.
	*
	* @see #getPublicId
	*/
	public String getSystemId() {
	return (mInp != null) ? mInp.sysid : null;
	}

	/**
	* Return the line number where the current document event ends.
	*
	* @return Always returns -1 indicating the line number is not available.
	*
	* @see #getColumnNumber
	*/
	public int getLineNumber() {
	return -1;
	}

	/**
	* Return the column number where the current document event ends.
	*
	* @return Always returns -1 indicating the column number is not available.
	*
	* @see #getLineNumber
	*/
	public int getColumnNumber() {
	return -1;
	}

	/**
	* Parse an XML document from a system identifier (URI).
	*
	* <p>This method is a shortcut for the common case of reading a document
	* from a system identifier. It is the exact equivalent of the
	* following:</p>
	*
	* <pre>
	* parse(new InputSource(systemId));
	* </pre>
	*
	* <p>If the system identifier is a URL, it must be fully resolved by the
	* application before it is passed to the parser.</p>
	*
	* @param systemId The system identifier (URI).
	* @exception org.xml.sax.SAXException Any SAX exception, possibly wrapping
	* another exception.
	* @exception java.io.IOException An IO exception from the parser, possibly
	* from a byte stream or character stream supplied by the application.
	* @see #parse(org.xml.sax.InputSource)
	*/
	public void parse(String systemId) throws IOException, SAXException {
	parse(new InputSource(systemId));
	}

	/**
	* Parse an XML document.
	*
	* <p>The application can use this method to instruct the XML reader to
	* begin parsing an XML document from any valid input source (a character
	* stream, a byte stream, or a URI).</p>
	*
	* <p>Applications may not invoke this method while a parse is in progress
	* (they should create a new XMLReader instead for each nested XML
	* document). Once a parse is complete, an application may reuse the same
	* XMLReader object, possibly with a different input source.</p>
	*
	* <p>During the parse, the XMLReader will provide information about the XML
	* document through the registered event handlers.</p>
	*
	* <p>This method is synchronous: it will not return until parsing has
	* ended. If a client application wants to terminate parsing early, it
	* should throw an exception.</p>
	*
	* @param is The input source for the top-level of the XML document.
	* @exception org.xml.sax.SAXException Any SAX exception, possibly wrapping
	* another exception.
	* @exception java.io.IOException An IO exception from the parser, possibly
	* from a byte stream or character stream supplied by the application.
	* @see org.xml.sax.InputSource
	* @see #parse(java.lang.String)
	* @see #setEntityResolver
	* @see #setDTDHandler
	* @see #setContentHandler
	* @see #setErrorHandler
	*/
	public void parse(InputSource is) throws IOException, SAXException {
	if (is == null) {
	throw new IllegalArgumentException("");
	}
	// Set up the document
	mInp = new Input(BUFFSIZE_READER);
	mPh = PH_BEFORE_DOC; // before parsing
	try {
	setinp(is);
	} catch (SAXException saxe) {
	throw saxe;
	} catch (IOException ioe) {
	throw ioe;
	} catch (RuntimeException rte) {
	throw rte;
	} catch (Exception e) {
	panic(e.toString());
	}
	parse();
	}

	/**
	* Parse the content of the given {@link java.io.InputStream} instance as
	* XML using the specified {@link org.xml.sax.helpers.DefaultHandler}.
	*
	* @param src InputStream containing the content to be parsed.
	* @param handler The SAX DefaultHandler to use.
	* @exception IOException If any IO errors occur.
	* @exception IllegalArgumentException If the given InputStream or handler
	* is null.
	* @exception SAXException If the underlying parser throws a SAXException
	* while parsing.
	* @see org.xml.sax.helpers.DefaultHandler
	*/
	public void parse(InputStream src, DefaultHandler handler)
	throws SAXException, IOException {
	if ((src == null) \|\| (handler == null)) {
	throw new IllegalArgumentException("");
	}
	parse(new InputSource(src), handler);
	}

	/**
	* Parse the content given {@link org.xml.sax.InputSource} as XML using the
	* specified {@link org.xml.sax.helpers.DefaultHandler}.
	*
	* @param is The InputSource containing the content to be parsed.
	* @param handler The SAX DefaultHandler to use.
	* @exception IOException If any IO errors occur.
	* @exception IllegalArgumentException If the InputSource or handler is
	* null.
	* @exception SAXException If the underlying parser throws a SAXException
	* while parsing.
	* @see org.xml.sax.helpers.DefaultHandler
	*/
	public void parse(InputSource is, DefaultHandler handler)
	throws SAXException, IOException
	{
	if ((is == null) \|\| (handler == null)) {
	throw new IllegalArgumentException("");
	}
	// Set up the handler
	mHandCont = handler;
	mHandDtd = handler;
	mHandErr = handler;
	mHandEnt = handler;
	// Set up the document
	mInp = new Input(BUFFSIZE_READER);
	mPh = PH_BEFORE_DOC; // before parsing
	try {
	setinp(is);
	} catch (SAXException \| IOException \| RuntimeException saxe) {
	throw saxe;
	} catch (Exception e) {
	panic(e.toString());
	}
	parse();
	}

	/**
	* Parse the XML document content using specified handlers and an input
	* source.
	*
	* @exception IOException If any IO errors occur.
	* @exception SAXException If the underlying parser throws a SAXException
	* while parsing.
	*/
	@SuppressWarnings("fallthrough")
	private void parse() throws SAXException, IOException {
	init();
	try {
	mHandCont.setDocumentLocator(this);
	mHandCont.startDocument();

	if (mPh != PH_MISC_DTD) {
	mPh = PH_MISC_DTD; // misc before DTD
	}
	int evt = EV_NULL;
	// XML document prolog
	do {
	wsskip();
	switch (evt = step()) {
	case EV_ELM:
	case EV_ELMS:
	mPh = PH_DOCELM;
	break;

	case EV_COMM:
	case EV_PI:
	break;

	case EV_DTD:
	if (mPh >= PH_DTD_MISC) {
	panic(FAULT);
	}
	mPh = PH_DTD_MISC; // misc after DTD
	break;

	default:
	panic(FAULT);
	}
	} while (mPh < PH_DOCELM); // misc before DTD
	// XML document starting with document's element
	do {
	switch (evt) {
	case EV_ELM:
	case EV_ELMS:
	// Report the element
	if (mIsNSAware == true) {
	mHandCont.startElement(
	mElm.value,
	mElm.name,
	"",
	mAttrs);
	} else {
	mHandCont.startElement(
	"",
	"",
	mElm.name,
	mAttrs);
	}
	if (evt == EV_ELMS) {
	evt = step();
	break;
	}

	case EV_ELME:
	// Report the end of element
	if (mIsNSAware == true) {
	mHandCont.endElement(mElm.value, mElm.name, "");
	} else {
	mHandCont.endElement("", "", mElm.name);
	}
	// Restore the top of the prefix stack
	while (mPref.list == mElm) {
	mHandCont.endPrefixMapping(mPref.name);
	mPref = del(mPref);
	}
	// Remove the top element tag
	mElm = del(mElm);
	if (mElm == null) {
	mPh = PH_DOCELM_MISC;
	} else {
	evt = step();
	}
	break;

	case EV_TEXT:
	case EV_WSPC:
	case EV_CDAT:
	case EV_COMM:
	case EV_PI:
	case EV_ENT:
	evt = step();
	break;

	default:
	panic(FAULT);
	}
	} while (mPh == PH_DOCELM);
	// Misc after document's element
	do {
	if (wsskip() == EOS) {
	break;
	}

	switch (step()) {
	case EV_COMM:
	case EV_PI:
	break;

	default:
	panic(FAULT);
	}
	} while (mPh == PH_DOCELM_MISC);
	mPh = PH_AFTER_DOC; // parsing is completed

	} catch (SAXException saxe) {
	throw saxe;
	} catch (IOException ioe) {
	throw ioe;
	} catch (RuntimeException rte) {
	throw rte;
	} catch (Exception e) {
	panic(e.toString());
	} finally {
	mHandCont.endDocument();
	cleanup();
	}
	}

	/**
	* Reports document type.
	*
	* @param name The name of the entity.
	* @param pubid The public identifier of the entity or <code>null</code>.
	* @param sysid The system identifier of the entity or <code>null</code>.
	*/
	protected void docType(String name, String pubid, String sysid) throws SAXException {
	mHandDtd.startDTD(name, pubid, sysid);
	}

	/**
	* Reports the start of DTD internal subset.
	*
	* @throws SAXException if the receiver throws SAXException
	*/
	public void startInternalSub () throws SAXException {
	mHandDtd.startInternalSub();
	}

	/**
	* Reports a comment.
	*
	* @param text The comment text starting from first charcater.
	* @param length The number of characters in comment.
	*/
	protected void comm(char[] text, int length) {
	}

	/**
	* Reports a processing instruction.
	*
	* @param target The processing instruction target name.
	* @param body The processing instruction body text.
	*/
	protected void pi(String target, String body) throws SAXException {
	mHandCont.processingInstruction(target, body);
	}

	/**
	* Reports new namespace prefix. The Namespace prefix (
	* <code>mPref.name</code>) being declared and the Namespace URI (
	* <code>mPref.value</code>) the prefix is mapped to. An empty string is
	* used for the default element namespace, which has no prefix.
	*/
	protected void newPrefix() throws SAXException {
	mHandCont.startPrefixMapping(mPref.name, mPref.value);
	}

	/**
	* Reports skipped entity name.
	*
	* @param name The entity name.
	*/
	protected void skippedEnt(String name) throws SAXException {
	mHandCont.skippedEntity(name);
	}

	/**
	* Returns an
	* <code>InputSource</code> for specified entity or
	* <code>null</code>.
	*
	* @param name The name of the entity.
	* @param pubid The public identifier of the entity.
	* @param sysid The system identifier of the entity.
	*/
	protected InputSource resolveEnt(String name, String pubid, String sysid)
	throws SAXException, IOException
	{
	return mHandEnt.resolveEntity(pubid, sysid);
	}

	/**
	* Reports notation declaration.
	*
	* @param name The notation's name.
	* @param pubid The notation's public identifier, or null if none was given.
	* @param sysid The notation's system identifier, or null if none was given.
	*/
	protected void notDecl(String name, String pubid, String sysid)
	throws SAXException
	{
	mHandDtd.notationDecl(name, pubid, sysid);
	}

	/**
	* Reports unparsed entity name.
	*
	* @param name The unparsed entity's name.
	* @param pubid The entity's public identifier, or null if none was given.
	* @param sysid The entity's system identifier.
	* @param notation The name of the associated notation.
	*/
	protected void unparsedEntDecl(String name, String pubid, String sysid, String notation)
	throws SAXException
	{
	mHandDtd.unparsedEntityDecl(name, pubid, sysid, notation);
	}

	/**
	* Notifies the handler about fatal parsing error.
	*
	* @param msg The problem description message.
	*/
	protected void panic(String msg) throws SAXException {
	SAXParseException spe = new SAXParseException(msg, this);
	mHandErr.fatalError(spe);
	throw spe; // [#1.2] fatal error definition
	}

	/**
	* Reports characters and empties the parser's buffer. This method is called
	* only if parser is going to return control to the main loop. This means
	* that this method may use parser buffer to report white space without
	* copying characters to temporary buffer.
	*/
	protected void bflash() throws SAXException {
	if (mBuffIdx >= 0) {
	// Textual data has been read
	mHandCont.characters(mBuff, 0, (mBuffIdx + 1));
	mBuffIdx = -1;
	}
	}

	/**
	* Reports white space characters and empties the parser's buffer. This
	* method is called only if parser is going to return control to the main
	* loop. This means that this method may use parser buffer to report white
	* space without copying characters to temporary buffer.
	*/
	protected void bflash_ws() throws SAXException {
	if (mBuffIdx >= 0) {
	// BUG: With additional info from DTD and xml:space attr [#2.10]
	// the following call can be supported:
	// mHandCont.ignorableWhitespace(mBuff, 0, (mBuffIdx + 1));

	// Textual data has been read
	mHandCont.characters(mBuff, 0, (mBuffIdx + 1));
	mBuffIdx = -1;
	}
	}

	public boolean getFeature(String name) {
	throw new UnsupportedOperationException("Not supported yet.");
	}

	public void setFeature(String name, boolean value) {
	throw new UnsupportedOperationException("Not supported yet.");
	}

	public Object getProperty(String name) {
	throw new UnsupportedOperationException("Not supported yet.");
	}

	public void setProperty(String name, Object value) {
	throw new UnsupportedOperationException("Not supported yet.");
	}
	}

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