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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.io.IOException;
	import java.io.Serializable;

	import com.sun.org.apache.xml.internal.res.XMLErrorResources;
	import com.sun.org.apache.xml.internal.res.XMLMessages;
	import java.util.Objects;

	/**
	* A class to represent a Uniform Resource Identifier (URI). This class
	* is designed to handle the parsing of URIs and provide access to
	* the various components (scheme, host, port, userinfo, path, query
	* string and fragment) that may constitute a URI.
	* <p>
	* Parsing of a URI specification is done according to the URI
	* syntax described in RFC 2396
	* <http://www.ietf.org/rfc/rfc2396.txt?number=2396>. Every URI consists
	* of a scheme, followed by a colon (':'), followed by a scheme-specific
	* part. For URIs that follow the "generic URI" syntax, the scheme-
	* specific part begins with two slashes ("//") and may be followed
	* by an authority segment (comprised of user information, host, and
	* port), path segment, query segment and fragment. Note that RFC 2396
	* no longer specifies the use of the parameters segment and excludes
	* the "user:password" syntax as part of the authority segment. If
	* "user:password" appears in a URI, the entire user/password string
	* is stored as userinfo.
	* <p>
	* For URIs that do not follow the "generic URI" syntax (e.g. mailto),
	* the entire scheme-specific part is treated as the "path" portion
	* of the URI.
	* <p>
	* Note that, unlike the java.net.URL class, this class does not provide
	* any built-in network access functionality nor does it provide any
	* scheme-specific functionality (for example, it does not know a
	* default port for a specific scheme). Rather, it only knows the
	* grammar and basic set of operations that can be applied to a URI.
	*
	*
	* @LastModified: Oct 2017
	*/
	public class URI implements Serializable
	{
	private static final long serialVersionUID = 7096266377907081897L;

	/**
	* MalformedURIExceptions are thrown in the process of building a URI
	* or setting fields on a URI when an operation would result in an
	* invalid URI specification.
	*
	*/
	public static class MalformedURIException extends IOException
	{
	private static final long serialVersionUID = -8498313684991136829L;

	/**
	* Constructs a <code>MalformedURIException</code> with no specified
	* detail message.
	*/
	public MalformedURIException()
	{
	super();
	}

	/**
	* Constructs a <code>MalformedURIException</code> with the
	* specified detail message.
	*
	* @param p_msg the detail message.
	*/
	public MalformedURIException(String p_msg)
	{
	super(p_msg);
	}
	}

	/** reserved characters */
	private static final String RESERVED_CHARACTERS = ";/?:@&=+$,";

	/**
	* URI punctuation mark characters - these, combined with
	* alphanumerics, constitute the "unreserved" characters
	*/
	private static final String MARK_CHARACTERS = "-_.!~*'() ";

	/** scheme can be composed of alphanumerics and these characters */
	private static final String SCHEME_CHARACTERS = "+-.";

	/**
	* userinfo can be composed of unreserved, escaped and these
	* characters
	*/
	private static final String USERINFO_CHARACTERS = ";:&=+$,";

	/** Stores the scheme (usually the protocol) for this URI.
	* @serial */
	private String m_scheme = null;

	/** If specified, stores the userinfo for this URI; otherwise null.
	* @serial */
	private String m_userinfo = null;

	/** If specified, stores the host for this URI; otherwise null.
	* @serial */
	private String m_host = null;

	/** If specified, stores the port for this URI; otherwise -1.
	* @serial */
	private int m_port = -1;

	/** If specified, stores the path for this URI; otherwise null.
	* @serial */
	private String m_path = null;

	/**
	* If specified, stores the query string for this URI; otherwise
	* null.
	* @serial
	*/
	private String m_queryString = null;

	/** If specified, stores the fragment for this URI; otherwise null.
	* @serial */
	private String m_fragment = null;

	/** Indicate whether in DEBUG mode */
	private static boolean DEBUG = false;

	/**
	* Construct a new and uninitialized URI.
	*/
	public URI(){}

	/**
	* Construct a new URI from another URI. All fields for this URI are
	* set equal to the fields of the URI passed in.
	*
	* @param p_other the URI to copy (cannot be null)
	*/
	public URI(URI p_other)
	{
	initialize(p_other);
	}

	/**
	* Construct a new URI from a URI specification string. If the
	* specification follows the "generic URI" syntax, (two slashes
	* following the first colon), the specification will be parsed
	* accordingly - setting the scheme, userinfo, host,port, path, query
	* string and fragment fields as necessary. If the specification does
	* not follow the "generic URI" syntax, the specification is parsed
	* into a scheme and scheme-specific part (stored as the path) only.
	*
	* @param p_uriSpec the URI specification string (cannot be null or
	* empty)
	*
	* @throws MalformedURIException if p_uriSpec violates any syntax
	* rules
	*/
	public URI(String p_uriSpec) throws MalformedURIException
	{
	this((URI) null, p_uriSpec);
	}

	/**
	* Construct a new URI from a base URI and a URI specification string.
	* The URI specification string may be a relative URI.
	*
	* @param p_base the base URI (cannot be null if p_uriSpec is null or
	* empty)
	* @param p_uriSpec the URI specification string (cannot be null or
	* empty if p_base is null)
	*
	* @throws MalformedURIException if p_uriSpec violates any syntax
	* rules
	*/
	public URI(URI p_base, String p_uriSpec) throws MalformedURIException
	{
	initialize(p_base, p_uriSpec);
	}

	/**
	* Construct a new URI that does not follow the generic URI syntax.
	* Only the scheme and scheme-specific part (stored as the path) are
	* initialized.
	*
	* @param p_scheme the URI scheme (cannot be null or empty)
	* @param p_schemeSpecificPart the scheme-specific part (cannot be
	* null or empty)
	*
	* @throws MalformedURIException if p_scheme violates any
	* syntax rules
	*/
	public URI(String p_scheme, String p_schemeSpecificPart)
	throws MalformedURIException
	{

	if (p_scheme == null \|\| p_scheme.trim().length() == 0)
	{
	throw new MalformedURIException(
	"Cannot construct URI with null/empty scheme!");
	}

	if (p_schemeSpecificPart == null
	\|\| p_schemeSpecificPart.trim().length() == 0)
	{
	throw new MalformedURIException(
	"Cannot construct URI with null/empty scheme-specific part!");
	}

	setScheme(p_scheme);
	setPath(p_schemeSpecificPart);
	}

	/**
	* Construct a new URI that follows the generic URI syntax from its
	* component parts. Each component is validated for syntax and some
	* basic semantic checks are performed as well. See the individual
	* setter methods for specifics.
	*
	* @param p_scheme the URI scheme (cannot be null or empty)
	* @param p_host the hostname or IPv4 address for the URI
	* @param p_path the URI path - if the path contains '?' or '#',
	* then the query string and/or fragment will be
	* set from the path; however, if the query and
	* fragment are specified both in the path and as
	* separate parameters, an exception is thrown
	* @param p_queryString the URI query string (cannot be specified
	* if path is null)
	* @param p_fragment the URI fragment (cannot be specified if path
	* is null)
	*
	* @throws MalformedURIException if any of the parameters violates
	* syntax rules or semantic rules
	*/
	public URI(String p_scheme, String p_host, String p_path, String p_queryString, String p_fragment)
	throws MalformedURIException
	{
	this(p_scheme, null, p_host, -1, p_path, p_queryString, p_fragment);
	}

	/**
	* Construct a new URI that follows the generic URI syntax from its
	* component parts. Each component is validated for syntax and some
	* basic semantic checks are performed as well. See the individual
	* setter methods for specifics.
	*
	* @param p_scheme the URI scheme (cannot be null or empty)
	* @param p_userinfo the URI userinfo (cannot be specified if host
	* is null)
	* @param p_host the hostname or IPv4 address for the URI
	* @param p_port the URI port (may be -1 for "unspecified"; cannot
	* be specified if host is null)
	* @param p_path the URI path - if the path contains '?' or '#',
	* then the query string and/or fragment will be
	* set from the path; however, if the query and
	* fragment are specified both in the path and as
	* separate parameters, an exception is thrown
	* @param p_queryString the URI query string (cannot be specified
	* if path is null)
	* @param p_fragment the URI fragment (cannot be specified if path
	* is null)
	*
	* @throws MalformedURIException if any of the parameters violates
	* syntax rules or semantic rules
	*/
	public URI(String p_scheme, String p_userinfo, String p_host, int p_port, String p_path, String p_queryString, String p_fragment)
	throws MalformedURIException
	{

	if (p_scheme == null \|\| p_scheme.trim().length() == 0)
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_REQUIRED, null)); //"Scheme is required!");
	}

	if (p_host == null)
	{
	if (p_userinfo != null)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_USERINFO_IF_NO_HOST, null)); //"Userinfo may not be specified if host is not specified!");
	}

	if (p_port != -1)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_PORT_IF_NO_HOST, null)); //"Port may not be specified if host is not specified!");
	}
	}

	if (p_path != null)
	{
	if (p_path.indexOf('?') != -1 && p_queryString != null)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_QUERY_STRING_IN_PATH, null)); //"Query string cannot be specified in path and query string!");
	}

	if (p_path.indexOf('#') != -1 && p_fragment != null)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_FRAGMENT_STRING_IN_PATH, null)); //"Fragment cannot be specified in both the path and fragment!");
	}
	}

	setScheme(p_scheme);
	setHost(p_host);
	setPort(p_port);
	setUserinfo(p_userinfo);
	setPath(p_path);
	setQueryString(p_queryString);
	setFragment(p_fragment);
	}

	/**
	* Initialize all fields of this URI from another URI.
	*
	* @param p_other the URI to copy (cannot be null)
	*/
	private void initialize(URI p_other)
	{

	m_scheme = p_other.getScheme();
	m_userinfo = p_other.getUserinfo();
	m_host = p_other.getHost();
	m_port = p_other.getPort();
	m_path = p_other.getPath();
	m_queryString = p_other.getQueryString();
	m_fragment = p_other.getFragment();
	}

	/**
	* Initializes this URI from a base URI and a URI specification string.
	* See RFC 2396 Section 4 and Appendix B for specifications on parsing
	* the URI and Section 5 for specifications on resolving relative URIs
	* and relative paths.
	*
	* @param p_base the base URI (may be null if p_uriSpec is an absolute
	* URI)
	* @param p_uriSpec the URI spec string which may be an absolute or
	* relative URI (can only be null/empty if p_base
	* is not null)
	*
	* @throws MalformedURIException if p_base is null and p_uriSpec
	* is not an absolute URI or if
	* p_uriSpec violates syntax rules
	*/
	private void initialize(URI p_base, String p_uriSpec)
	throws MalformedURIException
	{

	if (p_base == null
	&& (p_uriSpec == null \|\| p_uriSpec.trim().length() == 0))
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_CANNOT_INIT_URI_EMPTY_PARMS, null)); //"Cannot initialize URI with empty parameters.");
	}

	// just make a copy of the base if spec is empty
	if (p_uriSpec == null \|\| p_uriSpec.trim().length() == 0)
	{
	initialize(p_base);

	return;
	}

	String uriSpec = p_uriSpec.trim();
	int uriSpecLen = uriSpec.length();
	int index = 0;

	// check for scheme
	int colonIndex = uriSpec.indexOf(':');
	if (colonIndex < 0)
	{
	if (p_base == null)
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_SCHEME_IN_URI, new Object[]{uriSpec})); //"No scheme found in URI: "+uriSpec);
	}
	}
	else
	{
	initializeScheme(uriSpec);
	uriSpec = uriSpec.substring(colonIndex+1);
	// This is a fix for XALANJ-2059.
	if(m_scheme != null && p_base != null)
	{
	// a) If <uriSpec> starts with a slash (/), it means <uriSpec> is absolute
	// and p_base can be ignored.
	// For example,
	// uriSpec = file:/myDIR/myXSLFile.xsl
	// p_base = file:/myWork/
	//
	// Here, uriSpec has absolute path after scheme file and :
	// Hence p_base can be ignored.
	//
	// b) Similarily, according to RFC 2396, uri is resolved for <uriSpec> relative to <p_base>
	// if scheme in <uriSpec> is same as scheme in <p_base>, else p_base can be ignored.
	//
	// c) if <p_base> is not hierarchical, it can be ignored.
	//
	if(uriSpec.startsWith("/") \|\| !m_scheme.equals(p_base.m_scheme) \|\| !p_base.getSchemeSpecificPart().startsWith("/"))
	{
	p_base = null;
	}
	}
	// Fix for XALANJ-2059
	uriSpecLen = uriSpec.length();
	}

	// two slashes means generic URI syntax, so we get the authority
	if (((index + 1) < uriSpecLen)
	&& (uriSpec.substring(index).startsWith("//")))
	{
	index += 2;

	int startPos = index;

	// get authority - everything up to path, query or fragment
	char testChar = '\0';

	while (index < uriSpecLen)
	{
	testChar = uriSpec.charAt(index);

	if (testChar == '/' \|\| testChar == '?' \|\| testChar == '#')
	{
	break;
	}

	index++;
	}

	// if we found authority, parse it out, otherwise we set the
	// host to empty string
	if (index > startPos)
	{
	initializeAuthority(uriSpec.substring(startPos, index));
	}
	else
	{
	m_host = "";
	}
	}

	initializePath(uriSpec.substring(index));

	// Resolve relative URI to base URI - see RFC 2396 Section 5.2
	// In some cases, it might make more sense to throw an exception
	// (when scheme is specified is the string spec and the base URI
	// is also specified, for example), but we're just following the
	// RFC specifications
	if (p_base != null)
	{

	// check to see if this is the current doc - RFC 2396 5.2 #2
	// note that this is slightly different from the RFC spec in that
	// we don't include the check for query string being null
	// - this handles cases where the urispec is just a query
	// string or a fragment (e.g. "?y" or "#s") -
	// see <http://www.ics.uci.edu/~fielding/url/test1.html> which
	// identified this as a bug in the RFC
	if (m_path.length() == 0 && m_scheme == null && m_host == null)
	{
	m_scheme = p_base.getScheme();
	m_userinfo = p_base.getUserinfo();
	m_host = p_base.getHost();
	m_port = p_base.getPort();
	m_path = p_base.getPath();

	if (m_queryString == null)
	{
	m_queryString = p_base.getQueryString();
	}

	return;
	}

	// check for scheme - RFC 2396 5.2 #3
	// if we found a scheme, it means absolute URI, so we're done
	if (m_scheme == null)
	{
	m_scheme = p_base.getScheme();
	}

	// check for authority - RFC 2396 5.2 #4
	// if we found a host, then we've got a network path, so we're done
	if (m_host == null)
	{
	m_userinfo = p_base.getUserinfo();
	m_host = p_base.getHost();
	m_port = p_base.getPort();
	}
	else
	{
	return;
	}

	// check for absolute path - RFC 2396 5.2 #5
	if (m_path.length() > 0 && m_path.startsWith("/"))
	{
	return;
	}

	// if we get to this point, we need to resolve relative path
	// RFC 2396 5.2 #6
	String path = "";
	String basePath = p_base.getPath();

	// 6a - get all but the last segment of the base URI path
	if (basePath != null)
	{
	int lastSlash = basePath.lastIndexOf('/');

	if (lastSlash != -1)
	{
	path = basePath.substring(0, lastSlash + 1);
	}
	}

	// 6b - append the relative URI path
	path = path.concat(m_path);

	// 6c - remove all "./" where "." is a complete path segment
	index = -1;

	while ((index = path.indexOf("/./")) != -1)
	{
	path = path.substring(0, index + 1).concat(path.substring(index + 3));
	}

	// 6d - remove "." if path ends with "." as a complete path segment
	if (path.endsWith("/."))
	{
	path = path.substring(0, path.length() - 1);
	}

	// 6e - remove all "<segment>/../" where "<segment>" is a complete
	// path segment not equal to ".."
	index = -1;

	int segIndex = -1;
	String tempString = null;

	while ((index = path.indexOf("/../")) > 0)
	{
	tempString = path.substring(0, path.indexOf("/../"));
	segIndex = tempString.lastIndexOf('/');

	if (segIndex != -1)
	{
	if (!tempString.substring(segIndex++).equals(".."))
	{
	path = path.substring(0, segIndex).concat(path.substring(index
	+ 4));
	}
	}
	}

	// 6f - remove ending "<segment>/.." where "<segment>" is a
	// complete path segment
	if (path.endsWith("/.."))
	{
	tempString = path.substring(0, path.length() - 3);
	segIndex = tempString.lastIndexOf('/');

	if (segIndex != -1)
	{
	path = path.substring(0, segIndex + 1);
	}
	}

	m_path = path;
	}
	}

	/**
	* Initialize the scheme for this URI from a URI string spec.
	*
	* @param p_uriSpec the URI specification (cannot be null)
	*
	* @throws MalformedURIException if URI does not have a conformant
	* scheme
	*/
	private void initializeScheme(String p_uriSpec) throws MalformedURIException
	{

	int uriSpecLen = p_uriSpec.length();
	int index = 0;
	String scheme = null;
	char testChar = '\0';

	while (index < uriSpecLen)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == ':' \|\| testChar == '/' \|\| testChar == '?'
	\|\| testChar == '#')
	{
	break;
	}

	index++;
	}

	scheme = p_uriSpec.substring(0, index);

	if (scheme.length() == 0)
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_SCHEME_INURI, null)); //"No scheme found in URI.");
	}
	else
	{
	setScheme(scheme);
	}
	}

	/**
	* Initialize the authority (userinfo, host and port) for this
	* URI from a URI string spec.
	*
	* @param p_uriSpec the URI specification (cannot be null)
	*
	* @throws MalformedURIException if p_uriSpec violates syntax rules
	*/
	private void initializeAuthority(String p_uriSpec)
	throws MalformedURIException
	{

	int index = 0;
	int start = 0;
	int end = p_uriSpec.length();
	char testChar = '\0';
	String userinfo = null;

	// userinfo is everything up @
	if (p_uriSpec.indexOf('@', start) != -1)
	{
	while (index < end)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == '@')
	{
	break;
	}

	index++;
	}

	userinfo = p_uriSpec.substring(start, index);

	index++;
	}

	// host is everything up to ':'
	String host = null;

	start = index;

	while (index < end)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == ':')
	{
	break;
	}

	index++;
	}

	host = p_uriSpec.substring(start, index);

	int port = -1;

	if (host.length() > 0)
	{

	// port
	if (testChar == ':')
	{
	index++;

	start = index;

	while (index < end)
	{
	index++;
	}

	String portStr = p_uriSpec.substring(start, index);

	if (portStr.length() > 0)
	{
	for (int i = 0; i < portStr.length(); i++)
	{
	if (!isDigit(portStr.charAt(i)))
	{
	throw new MalformedURIException(
	portStr + " is invalid. Port should only contain digits!");
	}
	}

	try
	{
	port = Integer.parseInt(portStr);
	}
	catch (NumberFormatException nfe)
	{

	// can't happen
	}
	}
	}
	}

	setHost(host);
	setPort(port);
	setUserinfo(userinfo);
	}

	/**
	* Initialize the path for this URI from a URI string spec.
	*
	* @param p_uriSpec the URI specification (cannot be null)
	*
	* @throws MalformedURIException if p_uriSpec violates syntax rules
	*/
	private void initializePath(String p_uriSpec) throws MalformedURIException
	{

	if (p_uriSpec == null)
	{
	throw new MalformedURIException(
	"Cannot initialize path from null string!");
	}

	int index = 0;
	int start = 0;
	int end = p_uriSpec.length();
	char testChar = '\0';

	// path - everything up to query string or fragment
	while (index < end)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == '?' \|\| testChar == '#')
	{
	break;
	}

	// check for valid escape sequence
	if (testChar == '%')
	{
	if (index + 2 >= end \|\|!isHex(p_uriSpec.charAt(index + 1))
	\|\|!isHex(p_uriSpec.charAt(index + 2)))
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_CONTAINS_INVALID_ESCAPE_SEQUENCE, null)); //"Path contains invalid escape sequence!");
	}
	}
	else if (!isReservedCharacter(testChar)
	&&!isUnreservedCharacter(testChar))
	{
	if ('\\' != testChar)
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_INVALID_CHAR, new Object[]{String.valueOf(testChar)})); //"Path contains invalid character: "
	//+ testChar);
	}

	index++;
	}

	m_path = p_uriSpec.substring(start, index);

	// query - starts with ? and up to fragment or end
	if (testChar == '?')
	{
	index++;

	start = index;

	while (index < end)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == '#')
	{
	break;
	}

	if (testChar == '%')
	{
	if (index + 2 >= end \|\|!isHex(p_uriSpec.charAt(index + 1))
	\|\|!isHex(p_uriSpec.charAt(index + 2)))
	{
	throw new MalformedURIException(
	"Query string contains invalid escape sequence!");
	}
	}
	else if (!isReservedCharacter(testChar)
	&&!isUnreservedCharacter(testChar))
	{
	throw new MalformedURIException(
	"Query string contains invalid character:" + testChar);
	}

	index++;
	}

	m_queryString = p_uriSpec.substring(start, index);
	}

	// fragment - starts with #
	if (testChar == '#')
	{
	index++;

	start = index;

	while (index < end)
	{
	testChar = p_uriSpec.charAt(index);

	if (testChar == '%')
	{
	if (index + 2 >= end \|\|!isHex(p_uriSpec.charAt(index + 1))
	\|\|!isHex(p_uriSpec.charAt(index + 2)))
	{
	throw new MalformedURIException(
	"Fragment contains invalid escape sequence!");
	}
	}
	else if (!isReservedCharacter(testChar)
	&&!isUnreservedCharacter(testChar))
	{
	throw new MalformedURIException(
	"Fragment contains invalid character:" + testChar);
	}

	index++;
	}

	m_fragment = p_uriSpec.substring(start, index);
	}
	}

	/**
	* Get the scheme for this URI.
	*
	* @return the scheme for this URI
	*/
	public String getScheme()
	{
	return m_scheme;
	}

	/**
	* Get the scheme-specific part for this URI (everything following the
	* scheme and the first colon). See RFC 2396 Section 5.2 for spec.
	*
	* @return the scheme-specific part for this URI
	*/
	public String getSchemeSpecificPart()
	{

	final StringBuilder schemespec = new StringBuilder();

	if (m_userinfo != null \|\| m_host != null \|\| m_port != -1)
	{
	schemespec.append("//");
	}

	if (m_userinfo != null)
	{
	schemespec.append(m_userinfo);
	schemespec.append('@');
	}

	if (m_host != null)
	{
	schemespec.append(m_host);
	}

	if (m_port != -1)
	{
	schemespec.append(':');
	schemespec.append(m_port);
	}

	if (m_path != null)
	{
	schemespec.append((m_path));
	}

	if (m_queryString != null)
	{
	schemespec.append('?');
	schemespec.append(m_queryString);
	}

	if (m_fragment != null)
	{
	schemespec.append('#');
	schemespec.append(m_fragment);
	}

	return schemespec.toString();
	}

	/**
	* Get the userinfo for this URI.
	*
	* @return the userinfo for this URI (null if not specified).
	*/
	public String getUserinfo()
	{
	return m_userinfo;
	}

	/**
	* Get the host for this URI.
	*
	* @return the host for this URI (null if not specified).
	*/
	public String getHost()
	{
	return m_host;
	}

	/**
	* Get the port for this URI.
	*
	* @return the port for this URI (-1 if not specified).
	*/
	public int getPort()
	{
	return m_port;
	}

	/**
	* Get the path for this URI (optionally with the query string and
	* fragment).
	*
	* @param p_includeQueryString if true (and query string is not null),
	* then a "?" followed by the query string
	* will be appended
	* @param p_includeFragment if true (and fragment is not null),
	* then a "#" followed by the fragment
	* will be appended
	*
	* @return the path for this URI possibly including the query string
	* and fragment
	*/
	public String getPath(boolean p_includeQueryString,
	boolean p_includeFragment)
	{

	final StringBuilder pathString = new StringBuilder(m_path);

	if (p_includeQueryString && m_queryString != null)
	{
	pathString.append('?');
	pathString.append(m_queryString);
	}

	if (p_includeFragment && m_fragment != null)
	{
	pathString.append('#');
	pathString.append(m_fragment);
	}

	return pathString.toString();
	}

	/**
	* Get the path for this URI. Note that the value returned is the path
	* only and does not include the query string or fragment.
	*
	* @return the path for this URI.
	*/
	public String getPath()
	{
	return m_path;
	}

	/**
	* Get the query string for this URI.
	*
	* @return the query string for this URI. Null is returned if there
	* was no "?" in the URI spec, empty string if there was a
	* "?" but no query string following it.
	*/
	public String getQueryString()
	{
	return m_queryString;
	}

	/**
	* Get the fragment for this URI.
	*
	* @return the fragment for this URI. Null is returned if there
	* was no "#" in the URI spec, empty string if there was a
	* "#" but no fragment following it.
	*/
	public String getFragment()
	{
	return m_fragment;
	}

	/**
	* Set the scheme for this URI. The scheme is converted to lowercase
	* before it is set.
	*
	* @param p_scheme the scheme for this URI (cannot be null)
	*
	* @throws MalformedURIException if p_scheme is not a conformant
	* scheme name
	*/
	public void setScheme(String p_scheme) throws MalformedURIException
	{

	if (p_scheme == null)
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_FROM_NULL_STRING, null)); //"Cannot set scheme from null string!");
	}

	if (!isConformantSchemeName(p_scheme))
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_NOT_CONFORMANT, null)); //"The scheme is not conformant.");
	}

	m_scheme = p_scheme.toLowerCase();
	}

	/**
	* Set the userinfo for this URI. If a non-null value is passed in and
	* the host value is null, then an exception is thrown.
	*
	* @param p_userinfo the userinfo for this URI
	*
	* @throws MalformedURIException if p_userinfo contains invalid
	* characters
	*/
	public void setUserinfo(String p_userinfo) throws MalformedURIException
	{

	if (p_userinfo == null)
	{
	m_userinfo = null;
	}
	else
	{
	if (m_host == null)
	{
	throw new MalformedURIException(
	"Userinfo cannot be set when host is null!");
	}

	// userinfo can contain alphanumerics, mark characters, escaped
	// and ';',':','&','=','+','$',','
	int index = 0;
	int end = p_userinfo.length();
	char testChar = '\0';

	while (index < end)
	{
	testChar = p_userinfo.charAt(index);

	if (testChar == '%')
	{
	if (index + 2 >= end \|\|!isHex(p_userinfo.charAt(index + 1))
	\|\|!isHex(p_userinfo.charAt(index + 2)))
	{
	throw new MalformedURIException(
	"Userinfo contains invalid escape sequence!");
	}
	}
	else if (!isUnreservedCharacter(testChar)
	&& USERINFO_CHARACTERS.indexOf(testChar) == -1)
	{
	throw new MalformedURIException(
	"Userinfo contains invalid character:" + testChar);
	}

	index++;
	}
	}

	m_userinfo = p_userinfo;
	}

	/**
	* Set the host for this URI. If null is passed in, the userinfo
	* field is also set to null and the port is set to -1.
	*
	* @param p_host the host for this URI
	*
	* @throws MalformedURIException if p_host is not a valid IP
	* address or DNS hostname.
	*/
	public void setHost(String p_host) throws MalformedURIException
	{

	if (p_host == null \|\| p_host.trim().length() == 0)
	{
	m_host = p_host;
	m_userinfo = null;
	m_port = -1;
	}
	else if (!isWellFormedAddress(p_host))
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_HOST_ADDRESS_NOT_WELLFORMED, null)); //"Host is not a well formed address!");
	}

	m_host = p_host;
	}

	/**
	* Set the port for this URI. -1 is used to indicate that the port is
	* not specified, otherwise valid port numbers are between 0 and 65535.
	* If a valid port number is passed in and the host field is null,
	* an exception is thrown.
	*
	* @param p_port the port number for this URI
	*
	* @throws MalformedURIException if p_port is not -1 and not a
	* valid port number
	*/
	public void setPort(int p_port) throws MalformedURIException
	{

	if (p_port >= 0 && p_port <= 65535)
	{
	if (m_host == null)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_PORT_WHEN_HOST_NULL, null)); //"Port cannot be set when host is null!");
	}
	}
	else if (p_port != -1)
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_INVALID_PORT, null)); //"Invalid port number!");
	}

	m_port = p_port;
	}

	/**
	* Set the path for this URI. If the supplied path is null, then the
	* query string and fragment are set to null as well. If the supplied
	* path includes a query string and/or fragment, these fields will be
	* parsed and set as well. Note that, for URIs following the "generic
	* URI" syntax, the path specified should start with a slash.
	* For URIs that do not follow the generic URI syntax, this method
	* sets the scheme-specific part.
	*
	* @param p_path the path for this URI (may be null)
	*
	* @throws MalformedURIException if p_path contains invalid
	* characters
	*/
	public void setPath(String p_path) throws MalformedURIException
	{

	if (p_path == null)
	{
	m_path = null;
	m_queryString = null;
	m_fragment = null;
	}
	else
	{
	initializePath(p_path);
	}
	}

	/**
	* Append to the end of the path of this URI. If the current path does
	* not end in a slash and the path to be appended does not begin with
	* a slash, a slash will be appended to the current path before the
	* new segment is added. Also, if the current path ends in a slash
	* and the new segment begins with a slash, the extra slash will be
	* removed before the new segment is appended.
	*
	* @param p_addToPath the new segment to be added to the current path
	*
	* @throws MalformedURIException if p_addToPath contains syntax
	* errors
	*/
	public void appendPath(String p_addToPath) throws MalformedURIException
	{

	if (p_addToPath == null \|\| p_addToPath.trim().length() == 0)
	{
	return;
	}

	if (!isURIString(p_addToPath))
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_INVALID_CHAR, new Object[]{p_addToPath})); //"Path contains invalid character!");
	}

	if (m_path == null \|\| m_path.trim().length() == 0)
	{
	if (p_addToPath.startsWith("/"))
	{
	m_path = p_addToPath;
	}
	else
	{
	m_path = "/" + p_addToPath;
	}
	}
	else if (m_path.endsWith("/"))
	{
	if (p_addToPath.startsWith("/"))
	{
	m_path = m_path.concat(p_addToPath.substring(1));
	}
	else
	{
	m_path = m_path.concat(p_addToPath);
	}
	}
	else
	{
	if (p_addToPath.startsWith("/"))
	{
	m_path = m_path.concat(p_addToPath);
	}
	else
	{
	m_path = m_path.concat("/" + p_addToPath);
	}
	}
	}

	/**
	* Set the query string for this URI. A non-null value is valid only
	* if this is an URI conforming to the generic URI syntax and
	* the path value is not null.
	*
	* @param p_queryString the query string for this URI
	*
	* @throws MalformedURIException if p_queryString is not null and this
	* URI does not conform to the generic
	* URI syntax or if the path is null
	*/
	public void setQueryString(String p_queryString)
	throws MalformedURIException
	{

	if (p_queryString == null)
	{
	m_queryString = null;
	}
	else if (!isGenericURI())
	{
	throw new MalformedURIException(
	"Query string can only be set for a generic URI!");
	}
	else if (getPath() == null)
	{
	throw new MalformedURIException(
	"Query string cannot be set when path is null!");
	}
	else if (!isURIString(p_queryString))
	{
	throw new MalformedURIException(
	"Query string contains invalid character!");
	}
	else
	{
	m_queryString = p_queryString;
	}
	}

	/**
	* Set the fragment for this URI. A non-null value is valid only
	* if this is a URI conforming to the generic URI syntax and
	* the path value is not null.
	*
	* @param p_fragment the fragment for this URI
	*
	* @throws MalformedURIException if p_fragment is not null and this
	* URI does not conform to the generic
	* URI syntax or if the path is null
	*/
	public void setFragment(String p_fragment) throws MalformedURIException
	{

	if (p_fragment == null)
	{
	m_fragment = null;
	}
	else if (!isGenericURI())
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_FOR_GENERIC_URI, null)); //"Fragment can only be set for a generic URI!");
	}
	else if (getPath() == null)
	{
	throw new MalformedURIException(
	XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_WHEN_PATH_NULL, null)); //"Fragment cannot be set when path is null!");
	}
	else if (!isURIString(p_fragment))
	{
	throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_INVALID_CHAR, null)); //"Fragment contains invalid character!");
	}
	else
	{
	m_fragment = p_fragment;
	}
	}

	/**
	* Determines if the passed-in Object is equivalent to this URI.
	*
	* @param p_test the Object to test for equality.
	*
	* @return true if p_test is a URI with all values equal to this
	* URI, false otherwise
	*/
	@Override
	public boolean equals(Object p_test)
	{

	if (p_test instanceof URI)
	{
	URI testURI = (URI) p_test;

	if (((m_scheme == null && testURI.m_scheme == null) \|\| (m_scheme != null && testURI.m_scheme != null && m_scheme.equals(
	testURI.m_scheme))) && ((m_userinfo == null && testURI.m_userinfo == null) \|\| (m_userinfo != null && testURI.m_userinfo != null && m_userinfo.equals(
	testURI.m_userinfo))) && ((m_host == null && testURI.m_host == null) \|\| (m_host != null && testURI.m_host != null && m_host.equals(
	testURI.m_host))) && m_port == testURI.m_port && ((m_path == null && testURI.m_path == null) \|\| (m_path != null && testURI.m_path != null && m_path.equals(
	testURI.m_path))) && ((m_queryString == null && testURI.m_queryString == null) \|\| (m_queryString != null && testURI.m_queryString != null && m_queryString.equals(
	testURI.m_queryString))) && ((m_fragment == null && testURI.m_fragment == null) \|\| (m_fragment != null && testURI.m_fragment != null && m_fragment.equals(
	testURI.m_fragment))))
	{
	return true;
	}
	}

	return false;
	}

	@Override
	public int hashCode() {
	int hash = 7;
	hash = 59 * hash + Objects.hashCode(this.m_scheme);
	hash = 59 * hash + Objects.hashCode(this.m_userinfo);
	hash = 59 * hash + Objects.hashCode(this.m_host);
	hash = 59 * hash + this.m_port;
	hash = 59 * hash + Objects.hashCode(this.m_path);
	hash = 59 * hash + Objects.hashCode(this.m_queryString);
	hash = 59 * hash + Objects.hashCode(this.m_fragment);
	return hash;
	}

	/**
	* Get the URI as a string specification. See RFC 2396 Section 5.2.
	*
	* @return the URI string specification
	*/
	@Override
	public String toString()
	{

	final StringBuilder uriSpecString = new StringBuilder();

	if (m_scheme != null)
	{
	uriSpecString.append(m_scheme);
	uriSpecString.append(':');
	}

	uriSpecString.append(getSchemeSpecificPart());

	return uriSpecString.toString();
	}

	/**
	* Get the indicator as to whether this URI uses the "generic URI"
	* syntax.
	*
	* @return true if this URI uses the "generic URI" syntax, false
	* otherwise
	*/
	public boolean isGenericURI()
	{

	// presence of the host (whether valid or empty) means
	// double-slashes which means generic uri
	return (m_host != null);
	}

	/**
	* Determine whether a scheme conforms to the rules for a scheme name.
	* A scheme is conformant if it starts with an alphanumeric, and
	* contains only alphanumerics, '+','-' and '.'.
	*
	*
	* @param p_scheme The sheme name to check
	* @return true if the scheme is conformant, false otherwise
	*/
	public static boolean isConformantSchemeName(String p_scheme)
	{

	if (p_scheme == null \|\| p_scheme.trim().length() == 0)
	{
	return false;
	}

	if (!isAlpha(p_scheme.charAt(0)))
	{
	return false;
	}

	char testChar;

	for (int i = 1; i < p_scheme.length(); i++)
	{
	testChar = p_scheme.charAt(i);

	if (!isAlphanum(testChar) && SCHEME_CHARACTERS.indexOf(testChar) == -1)
	{
	return false;
	}
	}

	return true;
	}

	/**
	* Determine whether a string is syntactically capable of representing
	* a valid IPv4 address or the domain name of a network host. A valid
	* IPv4 address consists of four decimal digit groups separated by a
	* '.'. A hostname consists of domain labels (each of which must
	* begin and end with an alphanumeric but may contain '-') separated
	* & by a '.'. See RFC 2396 Section 3.2.2.
	*
	*
	* @param p_address The address string to check
	* @return true if the string is a syntactically valid IPv4 address
	* or hostname
	*/
	public static boolean isWellFormedAddress(String p_address)
	{

	if (p_address == null)
	{
	return false;
	}

	String address = p_address.trim();
	int addrLength = address.length();

	if (addrLength == 0 \|\| addrLength > 255)
	{
	return false;
	}

	if (address.startsWith(".") \|\| address.startsWith("-"))
	{
	return false;
	}

	// rightmost domain label starting with digit indicates IP address
	// since top level domain label can only start with an alpha
	// see RFC 2396 Section 3.2.2
	int index = address.lastIndexOf('.');

	if (address.endsWith("."))
	{
	index = address.substring(0, index).lastIndexOf('.');
	}

	if (index + 1 < addrLength && isDigit(p_address.charAt(index + 1)))
	{
	char testChar;
	int numDots = 0;

	// make sure that 1) we see only digits and dot separators, 2) that
	// any dot separator is preceded and followed by a digit and
	// 3) that we find 3 dots
	for (int i = 0; i < addrLength; i++)
	{
	testChar = address.charAt(i);

	if (testChar == '.')
	{
	if (!isDigit(address.charAt(i - 1))
	\|\| (i + 1 < addrLength &&!isDigit(address.charAt(i + 1))))
	{
	return false;
	}

	numDots++;
	}
	else if (!isDigit(testChar))
	{
	return false;
	}
	}

	if (numDots != 3)
	{
	return false;
	}
	}
	else
	{

	// domain labels can contain alphanumerics and '-"
	// but must start and end with an alphanumeric
	char testChar;

	for (int i = 0; i < addrLength; i++)
	{
	testChar = address.charAt(i);

	if (testChar == '.')
	{
	if (!isAlphanum(address.charAt(i - 1)))
	{
	return false;
	}

	if (i + 1 < addrLength &&!isAlphanum(address.charAt(i + 1)))
	{
	return false;
	}
	}
	else if (!isAlphanum(testChar) && testChar != '-')
	{
	return false;
	}
	}
	}

	return true;
	}

	/**
	* Determine whether a char is a digit.
	*
	*
	* @param p_char the character to check
	* @return true if the char is betweeen '0' and '9', false otherwise
	*/
	private static boolean isDigit(char p_char)
	{
	return p_char >= '0' && p_char <= '9';
	}

	/**
	* Determine whether a character is a hexadecimal character.
	*
	*
	* @param p_char the character to check
	* @return true if the char is betweeen '0' and '9', 'a' and 'f'
	* or 'A' and 'F', false otherwise
	*/
	private static boolean isHex(char p_char)
	{
	return (isDigit(p_char) \|\| (p_char >= 'a' && p_char <= 'f')
	\|\| (p_char >= 'A' && p_char <= 'F'));
	}

	/**
	* Determine whether a char is an alphabetic character: a-z or A-Z
	*
	*
	* @param p_char the character to check
	* @return true if the char is alphabetic, false otherwise
	*/
	private static boolean isAlpha(char p_char)
	{
	return ((p_char >= 'a' && p_char <= 'z')
	\|\| (p_char >= 'A' && p_char <= 'Z'));
	}

	/**
	* Determine whether a char is an alphanumeric: 0-9, a-z or A-Z
	*
	*
	* @param p_char the character to check
	* @return true if the char is alphanumeric, false otherwise
	*/
	private static boolean isAlphanum(char p_char)
	{
	return (isAlpha(p_char) \|\| isDigit(p_char));
	}

	/**
	* Determine whether a character is a reserved character:
	* ';', '/', '?', ':', '@', '&', '=', '+', '$' or ','
	*
	*
	* @param p_char the character to check
	* @return true if the string contains any reserved characters
	*/
	private static boolean isReservedCharacter(char p_char)
	{
	return RESERVED_CHARACTERS.indexOf(p_char) != -1;
	}

	/**
	* Determine whether a char is an unreserved character.
	*
	*
	* @param p_char the character to check
	* @return true if the char is unreserved, false otherwise
	*/
	private static boolean isUnreservedCharacter(char p_char)
	{
	return (isAlphanum(p_char) \|\| MARK_CHARACTERS.indexOf(p_char) != -1);
	}

	/**
	* Determine whether a given string contains only URI characters (also
	* called "uric" in RFC 2396). uric consist of all reserved
	* characters, unreserved characters and escaped characters.
	*
	*
	* @param p_uric URI string
	* @return true if the string is comprised of uric, false otherwise
	*/
	private static boolean isURIString(String p_uric)
	{

	if (p_uric == null)
	{
	return false;
	}

	int end = p_uric.length();
	char testChar = '\0';

	for (int i = 0; i < end; i++)
	{
	testChar = p_uric.charAt(i);

	if (testChar == '%')
	{
	if (i + 2 >= end \|\|!isHex(p_uric.charAt(i + 1))
	\|\|!isHex(p_uric.charAt(i + 2)))
	{
	return false;
	}
	else
	{
	i += 2;

	continue;
	}
	}

	if (isReservedCharacter(testChar) \|\| isUnreservedCharacter(testChar))
	{
	continue;
	}
	else
	{
	return false;
	}
	}

	return true;
	}
	}

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