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	/*
	* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.xml.internal.utils;

	import java.util.ArrayList;
	import java.util.List;
	import java.util.StringTokenizer;
	import javax.xml.transform.Source;
	import javax.xml.transform.TransformerException;
	import javax.xml.transform.URIResolver;
	import javax.xml.transform.sax.SAXSource;
	import org.xml.sax.Attributes;
	import org.xml.sax.InputSource;
	import org.xml.sax.helpers.DefaultHandler;

	/**
	* Search for the xml-stylesheet processing instructions in an XML document.
	* @see <a href="http://www.w3.org/TR/xml-stylesheet/">
	* Associating Style Sheets with XML documents, Version 1.0</a>
	*
	* @LastModified: Oct 2017
	*/
	public class StylesheetPIHandler extends DefaultHandler
	{
	/** The baseID of the document being processed. */
	String m_baseID;

	/** The desired media criteria. */
	String m_media;

	/** The desired title criteria. */
	String m_title;

	/** The desired character set criteria. */
	String m_charset;

	/** A list of SAXSource objects that match the criteria. */
	List<Source> m_stylesheets = new ArrayList<>();

	// Add code to use a URIResolver. Patch from Dmitri Ilyin.

	/**
	* The object that implements the URIResolver interface,
	* or null.
	*/
	URIResolver m_uriResolver;

	/**
	* Get the object that will be used to resolve URIs in href
	* in xml-stylesheet processing instruction.
	*
	* @param resolver An object that implements the URIResolver interface,
	* or null.
	*/
	public void setURIResolver(URIResolver resolver)
	{
	m_uriResolver = resolver;
	}

	/**
	* Get the object that will be used to resolve URIs in href
	* in xml-stylesheet processing instruction.
	*
	* @return The URIResolver that was set with setURIResolver.
	*/
	public URIResolver getURIResolver()
	{
	return m_uriResolver;
	}

	/**
	* Construct a StylesheetPIHandler instance that will search
	* for xml-stylesheet PIs based on the given criteria.
	*
	* @param baseID The base ID of the XML document, needed to resolve
	* relative IDs.
	* @param media The desired media criteria.
	* @param title The desired title criteria.
	* @param charset The desired character set criteria.
	*/
	public StylesheetPIHandler(String baseID, String media, String title,
	String charset)
	{

	m_baseID = baseID;
	m_media = media;
	m_title = title;
	m_charset = charset;
	}

	/**
	* Return the last stylesheet found that match the constraints.
	*
	* @return Source object that references the last stylesheet reference
	* that matches the constraints.
	*/
	public Source getAssociatedStylesheet()
	{

	int sz = m_stylesheets.size();

	if (sz > 0)
	{
	Source source = m_stylesheets.get(sz-1);
	return source;
	}
	else
	return null;
	}

	/**
	* Handle the xml-stylesheet processing instruction.
	*
	* @param target The processing instruction target.
	* @param data The processing instruction data, or null if
	* none is supplied.
	* @throws org.xml.sax.SAXException Any SAX exception, possibly
	* wrapping another exception.
	* @see org.xml.sax.ContentHandler#processingInstruction
	* @see <a href="http://www.w3.org/TR/xml-stylesheet/">
	* Associating Style Sheets with XML documents, Version 1.0</a>
	*/
	public void processingInstruction(String target, String data)
	throws org.xml.sax.SAXException
	{

	if (target.equals("xml-stylesheet"))
	{
	String href = null; // CDATA #REQUIRED
	String type = null; // CDATA #REQUIRED
	String title = null; // CDATA #IMPLIED
	String media = null; // CDATA #IMPLIED
	String charset = null; // CDATA #IMPLIED
	boolean alternate = false; // (yes\|no) "no"
	StringTokenizer tokenizer = new StringTokenizer(data, " \t=\n", true);
	boolean lookedAhead = false;
	Source source = null;

	String token = "";
	while (tokenizer.hasMoreTokens())
	{
	if (!lookedAhead)
	token = tokenizer.nextToken();
	else
	lookedAhead = false;
	if (tokenizer.hasMoreTokens() &&
	(token.equals(" ") \|\| token.equals("\t") \|\| token.equals("=")))
	continue;

	String name = token;
	if (name.equals("type"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	type = token.substring(1, token.length() - 1);

	}
	else if (name.equals("href"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	href = token;
	if (tokenizer.hasMoreTokens())
	{
	token = tokenizer.nextToken();
	// If the href value has parameters to be passed to a
	// servlet(something like "foobar?id=12..."),
	// we want to make sure we get them added to
	// the href value. Without this check, we would move on
	// to try to process another attribute and that would be
	// wrong.
	// We need to set lookedAhead here to flag that we
	// already have the next token.
	while ( token.equals("=") && tokenizer.hasMoreTokens())
	{
	href = href + token + tokenizer.nextToken();
	if (tokenizer.hasMoreTokens())
	{
	token = tokenizer.nextToken();
	lookedAhead = true;
	}
	else
	{
	break;
	}
	}
	}
	href = href.substring(1, href.length() - 1);
	try
	{
	// Add code to use a URIResolver. Patch from Dmitri Ilyin.
	if (m_uriResolver != null)
	{
	source = m_uriResolver.resolve(href, m_baseID);
	}
	else
	{
	href = SystemIDResolver.getAbsoluteURI(href, m_baseID);
	source = new SAXSource(new InputSource(href));
	}
	}
	catch(TransformerException te)
	{
	throw new org.xml.sax.SAXException(te);
	}
	}
	else if (name.equals("title"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	title = token.substring(1, token.length() - 1);
	}
	else if (name.equals("media"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	media = token.substring(1, token.length() - 1);
	}
	else if (name.equals("charset"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	charset = token.substring(1, token.length() - 1);
	}
	else if (name.equals("alternate"))
	{
	token = tokenizer.nextToken();
	while (tokenizer.hasMoreTokens() &&
	(token.equals(" " ) \|\| token.equals("\t") \|\| token.equals("=")))
	token = tokenizer.nextToken();
	alternate = token.substring(1, token.length()
	- 1).equals("yes");
	}

	}

	if ((null != type)
	&& (type.equals("text/xsl") \|\| type.equals("text/xml") \|\| type.equals("application/xml+xslt"))
	&& (null != href))
	{
	if (null != m_media)
	{
	if (null != media)
	{
	if (!media.equals(m_media))
	return;
	}
	else
	return;
	}

	if (null != m_charset)
	{
	if (null != charset)
	{
	if (!charset.equals(m_charset))
	return;
	}
	else
	return;
	}

	if (null != m_title)
	{
	if (null != title)
	{
	if (!title.equals(m_title))
	return;
	}
	else
	return;
	}

	m_stylesheets.add(source);
	}
	}
	}


	/**
	* The spec notes that "The xml-stylesheet processing instruction is allowed only in the prolog of an XML document.",
	* so, at least for right now, I'm going to go ahead an throw a TransformerException
	* in order to stop the parse.
	*
	* @param namespaceURI The Namespace URI, or an empty string.
	* @param localName The local name (without prefix), or empty string if not namespace processing.
	* @param qName The qualified name (with prefix).
	* @param atts The specified or defaulted attributes.
	*
	* @throws StopParseException since there can be no valid xml-stylesheet processing
	* instructions past the first element.
	*/
	public void startElement(
	String namespaceURI, String localName, String qName, Attributes atts)
	throws org.xml.sax.SAXException
	{
	throw new StopParseException();
	}

	/**
	* Added additional getter and setter methods for the Base Id
	* to fix bugzilla bug 24187
	*
	*/
	public void setBaseId(String baseId) {
	m_baseID = baseId;

	}
	public String getBaseId() {
	return m_baseID ;
	}

	}

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