/*
* 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 org.apache.axis2.databinding.types;
import java.io.IOException;
import java.io.Serializable;
/**
* ******************************************************************* <i>Axis Note: This class was
* 'borrowed' from Xerces 2.0.2</i>
* <p/>
* 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 <a
* href="http://www.ietf.org/rfc/rfc2396.txt?number=2396">RFC 2396</a>, and amended by <a
* href="http://www.ietf.org/rfc/rfc2732.txt?number=2732">RFC 2732</a>.
* <p/>
* Every absolute 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.
* <p/>
* ********************************************************************
*/
public class URI implements Serializable {
private static final long serialVersionUID = 2172306044361227627L;
/**
* **************************************************************** 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.
* <p/>
* ******************************************************************
*/
public static class MalformedURIException extends IOException {
private static final long serialVersionUID = -8488692760975768757L;
/**
* *************************************************************** 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);
}
}
private static final byte [] fgLookupTable = new byte[128];
/**
* Character Classes
*/
/** reserved characters ;/?:@&=+$,[] */
//RFC 2732 added '[' and ']' as reserved characters
private static final int RESERVED_CHARACTERS = 0x01;
/**
* URI punctuation mark characters: -_.!~*'() - these, combined with alphanumerics, constitute the
* "unreserved" characters
*/
private static final int MARK_CHARACTERS = 0x02;
/** scheme can be composed of alphanumerics and these characters: +-. */
private static final int SCHEME_CHARACTERS = 0x04;
/** userinfo can be composed of unreserved, escaped and these characters: ;:&=+$, */
private static final int USERINFO_CHARACTERS = 0x08;
/** ASCII letter characters */
private static final int ASCII_ALPHA_CHARACTERS = 0x10;
/** ASCII digit characters */
private static final int ASCII_DIGIT_CHARACTERS = 0x20;
/** ASCII hex characters */
private static final int ASCII_HEX_CHARACTERS = 0x40;
/** Path characters */
private static final int PATH_CHARACTERS = 0x80;
/** Mask for alpha-numeric characters */
private static final int MASK_ALPHA_NUMERIC = ASCII_ALPHA_CHARACTERS | ASCII_DIGIT_CHARACTERS;
/** Mask for unreserved characters */
private static final int MASK_UNRESERVED_MASK = MASK_ALPHA_NUMERIC | MARK_CHARACTERS;
/** Mask for URI allowable characters except for % */
private static final int MASK_URI_CHARACTER = MASK_UNRESERVED_MASK | RESERVED_CHARACTERS;
/** Mask for scheme characters */
private static final int MASK_SCHEME_CHARACTER = MASK_ALPHA_NUMERIC | SCHEME_CHARACTERS;
/** Mask for userinfo characters */
private static final int MASK_USERINFO_CHARACTER = MASK_UNRESERVED_MASK | USERINFO_CHARACTERS;
/** Mask for path characters */
private static final int MASK_PATH_CHARACTER = MASK_UNRESERVED_MASK | PATH_CHARACTERS;
static {
// Add ASCII Digits and ASCII Hex Numbers
for (int i = '0'; i <= '9'; ++i) {
fgLookupTable[i] |= ASCII_DIGIT_CHARACTERS | ASCII_HEX_CHARACTERS;
}
// Add ASCII Letters and ASCII Hex Numbers
for (int i = 'A'; i <= 'F'; ++i) {
fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS;
fgLookupTable[i + 0x00000020] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS;
}
// Add ASCII Letters
for (int i = 'G'; i <= 'Z'; ++i) {
fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS;
fgLookupTable[i + 0x00000020] |= ASCII_ALPHA_CHARACTERS;
}
// Add Reserved Characters
fgLookupTable[';'] |= RESERVED_CHARACTERS;
fgLookupTable['/'] |= RESERVED_CHARACTERS;
fgLookupTable['?'] |= RESERVED_CHARACTERS;
fgLookupTable[':'] |= RESERVED_CHARACTERS;
fgLookupTable['@'] |= RESERVED_CHARACTERS;
fgLookupTable['&'] |= RESERVED_CHARACTERS;
fgLookupTable['='] |= RESERVED_CHARACTERS;
fgLookupTable['+'] |= RESERVED_CHARACTERS;
fgLookupTable['$'] |= RESERVED_CHARACTERS;
fgLookupTable[','] |= RESERVED_CHARACTERS;
fgLookupTable['['] |= RESERVED_CHARACTERS;
fgLookupTable[']'] |= RESERVED_CHARACTERS;
// Add Mark Characters
fgLookupTable['-'] |= MARK_CHARACTERS;
fgLookupTable['_'] |= MARK_CHARACTERS;
fgLookupTable['.'] |= MARK_CHARACTERS;
fgLookupTable['!'] |= MARK_CHARACTERS;
fgLookupTable['~'] |= MARK_CHARACTERS;
fgLookupTable['*'] |= MARK_CHARACTERS;
fgLookupTable['\''] |= MARK_CHARACTERS;
fgLookupTable['('] |= MARK_CHARACTERS;
fgLookupTable[')'] |= MARK_CHARACTERS;
// Add Scheme Characters
fgLookupTable['+'] |= SCHEME_CHARACTERS;
fgLookupTable['-'] |= SCHEME_CHARACTERS;
fgLookupTable['.'] |= SCHEME_CHARACTERS;
// Add Userinfo Characters
fgLookupTable[';'] |= USERINFO_CHARACTERS;
fgLookupTable[':'] |= USERINFO_CHARACTERS;
fgLookupTable['&'] |= USERINFO_CHARACTERS;
fgLookupTable['='] |= USERINFO_CHARACTERS;
fgLookupTable['+'] |= USERINFO_CHARACTERS;
fgLookupTable['$'] |= USERINFO_CHARACTERS;
fgLookupTable[','] |= USERINFO_CHARACTERS;
// Add Path Characters
fgLookupTable[';'] |= PATH_CHARACTERS;
fgLookupTable['/'] |= PATH_CHARACTERS;
fgLookupTable[':'] |= PATH_CHARACTERS;
fgLookupTable['@'] |= PATH_CHARACTERS;
fgLookupTable['&'] |= PATH_CHARACTERS;
fgLookupTable['='] |= PATH_CHARACTERS;
fgLookupTable['+'] |= PATH_CHARACTERS;
fgLookupTable['$'] |= PATH_CHARACTERS;
fgLookupTable[','] |= PATH_CHARACTERS;
}
/** Stores the scheme (usually the protocol) for this URI. */
private String m_scheme = null;
/** If specified, stores the userinfo for this URI; otherwise null */
private String m_userinfo = null;
/** If specified, stores the host for this URI; otherwise null */
private String m_host = null;
/** If specified, stores the port for this URI; otherwise -1 */
private int m_port = -1;
/** If specified, stores the registry based authority for this URI; otherwise -1 */
private String m_regAuthority = null;
/** If specified, stores the path for this URI; otherwise null */
private String m_path = null;
/** If specified, stores the query string for this URI; otherwise null. */
private String m_queryString = null;
/** If specified, stores the fragment for this URI; otherwise null */
private String m_fragment;
/** 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, IPv4 address or IPv6 reference 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, IPv4 address or IPv6 reference 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("Scheme is required!");
}
if (p_host == null) {
if (p_userinfo != null) {
throw new MalformedURIException(
"Userinfo may not be specified if host is not specified!");
}
if (p_port != -1) {
throw new MalformedURIException(
"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(
"Query string cannot be specified in path and query string!");
}
if (p_path.indexOf('#') != -1 && p_fragment != null) {
throw new MalformedURIException(
"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_regAuthority = p_other.getRegBasedAuthority();
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 {
String uriSpec = p_uriSpec;
int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0;
if (p_base == null && uriSpecLen == 0) {
throw new MalformedURIException(
"Cannot initialize URI with empty parameters.");
}
// just make a copy of the base if spec is empty
if (uriSpecLen == 0) {
initialize(p_base);
return;
}
int index = 0;
// Check for scheme, which must be before '/', '?' or '#'. Also handle
// names with DOS drive letters ('D:'), so 1-character schemes are not
// allowed.
int colonIdx = uriSpec.indexOf(':');
if (colonIdx != -1) {
final int searchFrom = colonIdx - 1;
// search backwards starting from character before ':'.
int slashIdx = uriSpec.lastIndexOf('/', searchFrom);
int queryIdx = uriSpec.lastIndexOf('?', searchFrom);
int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom);
if (colonIdx < 2 || slashIdx != -1 ||
queryIdx != -1 || fragmentIdx != -1) {
// A standalone base is a valid URI according to spec
if (colonIdx == 0 || (p_base == null && fragmentIdx != 0)) {
throw new MalformedURIException("No scheme found in URI.");
}
} else {
initializeScheme(uriSpec);
index = m_scheme.length() + 1;
// Neither 'scheme:' or 'scheme:#fragment' are valid URIs.
if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx + 1) == '#') {
throw new MalformedURIException("Scheme specific part cannot be empty.");
}
}
}
// Two slashes means we may have authority, but definitely means we're either
// matching net_path or abs_path. These two productions are ambiguous in that
// every net_path (except those containing an IPv6Reference) is an abs_path.
// RFC 2396 resolves this ambiguity by applying a greedy left most matching rule.
// Try matching net_path first, and if that fails we don't have authority so
// then attempt to match abs_path.
//
// net_path = "//" authority [ abs_path ]
// abs_path = "/" path_segments
if (((index + 1) < uriSpecLen) &&
(uriSpec.charAt(index) == '/' && uriSpec.charAt(index + 1) == '/')) {
index += 2;
int startPos = index;
// Authority will be everything up to path, query or fragment
char testChar = '\0';
while (index < uriSpecLen) {
testChar = uriSpec.charAt(index);
if (testChar == '/' || testChar == '?' || testChar == '#') {
break;
}
index++;
}
// Attempt to parse authority. If the section is an empty string
// this is a valid server based authority, so set the host to this
// value.
if (index > startPos) {
// If we didn't find authority we need to back up. Attempt to
// match against abs_path next.
if (!initializeAuthority(uriSpec.substring(startPos, index))) {
index = startPos - 2;
}
} else {
m_host = "";
}
}
initializePath(uriSpec, 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_regAuthority == null) {
m_scheme = p_base.getScheme();
m_userinfo = p_base.getUserinfo();
m_host = p_base.getHost();
m_port = p_base.getPort();
m_regAuthority = p_base.getRegBasedAuthority();
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();
} else {
return;
}
// 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_regAuthority == null) {
m_userinfo = p_base.getUserinfo();
m_host = p_base.getHost();
m_port = p_base.getPort();
m_regAuthority = p_base.getRegBasedAuthority();
} 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 && basePath.length() > 0) {
int lastSlash = basePath.lastIndexOf('/');
if (lastSlash != -1) {
path = basePath.substring(0, lastSlash + 1);
}
} else if (m_path.length() > 0) {
path = "/";
}
// 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("/../", index)) > 0) {
tempString = path.substring(0, path.indexOf("/../"));
segIndex = tempString.lastIndexOf('/');
if (segIndex != -1) {
if (!tempString.substring(segIndex).equals("..")) {
path = path.substring(0, segIndex + 1).concat(path.substring(index + 4));
index = segIndex;
} else
index += 4;
} else
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("No scheme found in URI.");
} else {
setScheme(scheme);
}
}
/**
* Initialize the authority (either server or registry based) for this URI from a URI string
* spec.
*
* @param p_uriSpec the URI specification (cannot be null)
* @return true if the given string matched server or registry based authority
*/
private boolean initializeAuthority(String p_uriSpec) {
int index = 0;
int start = 0;
int end = p_uriSpec.length();
char testChar = '\0';
String userinfo = null;
// userinfo is everything up to @
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 last ':', or up to
// and including ']' if followed by ':'.
String host = null;
start = index;
boolean hasPort = false;
if (index < end) {
if (p_uriSpec.charAt(start) == '[') {
int bracketIndex = p_uriSpec.indexOf(']', start);
index = (bracketIndex != -1) ? bracketIndex : end;
if (index + 1 < end && p_uriSpec.charAt(index + 1) == ':') {
++index;
hasPort = true;
} else {
index = end;
}
} else {
int colonIndex = p_uriSpec.lastIndexOf(':', end);
index = (colonIndex > start) ? colonIndex : end;
hasPort = (index != end);
}
}
host = p_uriSpec.substring(start, index);
int port = -1;
if (host.length() > 0) {
// port
if (hasPort) {
index++;
start = index;
while (index < end) {
index++;
}
String portStr = p_uriSpec.substring(start, index);
if (portStr.length() > 0) {
// REVISIT: Remove this code.
/** for (int i = 0; i < portStr.length(); i++) {
if (!isDigit(portStr.charAt(i))) {
throw new MalformedURIException(
portStr +
" is invalid. Port should only contain digits!");
}
}**/
// REVISIT: Remove this code.
// Store port value as string instead of integer.
try {
port = Integer.parseInt(portStr);
if (port == -1) --port;
}
catch (NumberFormatException nfe) {
port = -2;
}
}
}
}
if (isValidServerBasedAuthority(host, port, userinfo)) {
m_host = host;
m_port = port;
m_userinfo = userinfo;
return true;
}
// Note: Registry based authority is being removed from a
// new spec for URI which would obsolete RFC 2396. If the
// spec is added to XML errata, processing of reg_name
// needs to be removed. - mrglavas.
else if (isValidRegistryBasedAuthority(p_uriSpec)) {
m_regAuthority = p_uriSpec;
return true;
}
return false;
}
/**
* Determines whether the components host, port, and user info are valid as a server authority.
*
* @param host the host component of authority
* @param port the port number component of authority
* @param userinfo the user info component of authority
* @return true if the given host, port, and userinfo compose a valid server authority
*/
private boolean isValidServerBasedAuthority(String host, int port, String userinfo) {
// Check if the host is well formed.
if (!isWellFormedAddress(host)) {
return false;
}
// Check that port is well formed if it exists.
// REVISIT: There's no restriction on port value ranges, but
// perform the same check as in setPort to be consistent. Pass
// in a string to this method instead of an integer.
if (port < -1 || port > 65535) {
return false;
}
// Check that userinfo is well formed if it exists.
if (userinfo != null) {
// Userinfo can contain alphanumerics, mark characters, escaped
// and ';',':','&','=','+','$',','
int index = 0;
int end = userinfo.length();
char testChar = '\0';
while (index < end) {
testChar = userinfo.charAt(index);
if (testChar == '%') {
if (index + 2 >= end ||
!isHex(userinfo.charAt(index + 1)) ||
!isHex(userinfo.charAt(index + 2))) {
return false;
}
index += 2;
} else if (!isUserinfoCharacter(testChar)) {
return false;
}
++index;
}
}
return true;
}
/**
* Determines whether the given string is a registry based authority.
*
* @param authority the authority component of a URI
* @return true if the given string is a registry based authority
*/
private boolean isValidRegistryBasedAuthority(String authority) {
int index = 0;
int end = authority.length();
char testChar;
while (index < end) {
testChar = authority.charAt(index);
// check for valid escape sequence
if (testChar == '%') {
if (index + 2 >= end ||
!isHex(authority.charAt(index + 1)) ||
!isHex(authority.charAt(index + 2))) {
return false;
}
index += 2;
}
// can check against path characters because the set
// is the same except for '/' which we've already excluded.
else if (!isPathCharacter(testChar)) {
return false;
}
++index;
}
return true;
}
/**
* Initialize the path for this URI from a URI string spec.
*
* @param p_uriSpec the URI specification (cannot be null)
* @param p_nStartIndex the index to begin scanning from
* @throws MalformedURIException if p_uriSpec violates syntax rules
*/
private void initializePath(String p_uriSpec, int p_nStartIndex)
throws MalformedURIException {
if (p_uriSpec == null) {
throw new MalformedURIException(
"Cannot initialize path from null string!");
}
int index = p_nStartIndex;
int start = p_nStartIndex;
int end = p_uriSpec.length();
char testChar = '\0';
// path - everything up to query string or fragment
if (start < end) {
// RFC 2732 only allows '[' and ']' to appear in the opaque part.
if (getScheme() == null || p_uriSpec.charAt(start) == '/') {
// Scan path.
// abs_path = "/" path_segments
// rel_path = rel_segment [ abs_path ]
while (index < end) {
testChar = p_uriSpec.charAt(index);
// 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(
"Path contains invalid escape sequence!");
}
index += 2;
}
// Path segments cannot contain '[' or ']' since pchar
// production was not changed by RFC 2732.
else if (!isPathCharacter(testChar)) {
if (testChar == '?' || testChar == '#') {
break;
}
throw new MalformedURIException(
"Path contains invalid character: " + testChar);
}
++index;
}
} else {
// Scan opaque part.
// opaque_part = uric_no_slash *uric
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(
"Opaque part contains invalid escape sequence!");
}
index += 2;
}
// If the scheme specific part is opaque, it can contain '['
// and ']'. uric_no_slash wasn't modified by RFC 2732, which
// I've interpreted as an error in the spec, since the
// production should be equivalent to (uric - '/'), and uric
// contains '[' and ']'. - mrglavas
else if (!isURICharacter(testChar)) {
throw new MalformedURIException(
"Opaque part 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!");
}
index += 2;
} else if (!isURICharacter(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!");
}
index += 2;
} else if (!isURICharacter(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() {
StringBuffer schemespec = new StringBuffer();
if (m_host != null || m_regAuthority != null) {
schemespec.append("//");
// Server based authority.
if (m_host != null) {
if (m_userinfo != null) {
schemespec.append(m_userinfo);
schemespec.append('@');
}
schemespec.append(m_host);
if (m_port != -1) {
schemespec.append(':');
schemespec.append(m_port);
}
}
// Registry based authority.
else {
schemespec.append(m_regAuthority);
}
}
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 registry based authority for this URI.
*
* @return the registry based authority (null if not specified).
*/
public String getRegBasedAuthority() {
return m_regAuthority;
}
/**
* 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) {
StringBuffer pathString = new StringBuffer(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(
"Cannot set scheme from null string!");
}
if (!isConformantSchemeName(p_scheme)) {
throw new MalformedURIException("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;
return;
} 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 (!isUserinfoCharacter(testChar)) {
throw new MalformedURIException(
"Userinfo contains invalid character:" + testChar);
}
index++;
}
}
m_userinfo = p_userinfo;
}
/**
* <p>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.</p>
* <p/>
* <p>Note: This method overwrites registry based authority if it previously existed in this
* URI.</p>
*
* @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.length() == 0) {
if (p_host != null) {
m_regAuthority = null;
}
m_host = p_host;
m_userinfo = null;
m_port = -1;
return;
} else if (!isWellFormedAddress(p_host)) {
throw new MalformedURIException("Host is not a well formed address!");
}
m_host = p_host;
m_regAuthority = null;
}
/**
* 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(
"Port cannot be set when host is null!");
}
} else if (p_port != -1) {
throw new MalformedURIException("Invalid port number!");
}
m_port = p_port;
}
/**
* <p>Sets the registry based authority for this URI.</p>
* <p/>
* <p>Note: This method overwrites server based authority if it previously existed in this
* URI.</p>
*
* @param authority the registry based authority for this URI
* @throws MalformedURIException it authority is not a well formed registry based authority
*/
public void setRegBasedAuthority(String authority)
throws MalformedURIException {
if (authority == null) {
m_regAuthority = null;
return;
}
// reg_name = 1*( unreserved | escaped | "$" | "," |
// ";" | ":" | "@" | "&" | "=" | "+" )
else if (authority.length() < 1 ||
!isValidRegistryBasedAuthority(authority) ||
authority.indexOf('/') != -1) {
throw new MalformedURIException("Registry based authority is not well formed.");
}
m_regAuthority = authority;
m_host = null;
m_userinfo = null;
m_port = -1;
}
/**
* 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, 0);
}
}
/**
* 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(
"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 (this.m_path == 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(
"Fragment can only be set for a generic URI!");
} else if (getPath() == null) {
throw new MalformedURIException(
"Fragment cannot be set when path is null!");
} else if (!isURIString(p_fragment)) {
throw new MalformedURIException(
"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
*/
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;
}
/**
* Returns a hash-code value for this URI. The hash code is based upon all of the URI's
* components, and satisfies the general contract of the {@link Object#hashCode()
* Object.hashCode} method. </p>
*
* @return A hash-code value for this URI
*/
public int hashCode() {
return toString().hashCode();
}
/**
* Get the URI as a string specification. See RFC 2396 Section 5.2.
*
* @return the URI string specification
*/
public String toString() {
StringBuffer uriSpecString = new StringBuffer();
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 '.'.
*
* @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;
int schemeLength = p_scheme.length();
for (int i = 1; i < schemeLength; ++i) {
testChar = p_scheme.charAt(i);
if (!isSchemeCharacter(testChar)) {
return false;
}
}
return true;
}
/**
* Determine whether a string is syntactically capable of representing a valid IPv4 address, IPv6
* reference or the domain name of a network host. A valid IPv4 address consists of four decimal
* digit groups separated by a '.'. Each group must consist of one to three digits. See RFC 2732
* Section 3, and RFC 2373 Section 2.2, for the definition of IPv6 references. 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.
*
* @return true if the string is a syntactically valid IPv4 address, IPv6 reference or hostname
*/
public static boolean isWellFormedAddress(String address) {
if (address == null) {
return false;
}
int addrLength = address.length();
if (addrLength == 0) {
return false;
}
// Check if the host is a valid IPv6reference.
if (address.startsWith("[")) {
return isWellFormedIPv6Reference(address);
}
// Cannot start with a '.', '-', or end with a '-'.
if (address.startsWith(".") ||
address.startsWith("-") ||
address.endsWith("-")) {
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(address.charAt(index + 1))) {
return isWellFormedIPv4Address(address);
} else {
// hostname = *( domainlabel "." ) toplabel [ "." ]
// domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
// toplabel = alpha | alpha *( alphanum | "-" ) alphanum
// RFC 2396 states that hostnames take the form described in
// RFC 1034 (Section 3) and RFC 1123 (Section 2.1). According
// to RFC 1034, hostnames are limited to 255 characters.
if (addrLength > 255) {
return false;
}
// domain labels can contain alphanumerics and '-"
// but must start and end with an alphanumeric
char testChar;
int labelCharCount = 0;
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;
}
labelCharCount = 0;
} else if (!isAlphanum(testChar) && testChar != '-') {
return false;
}
// RFC 1034: Labels must be 63 characters or less.
else if (++labelCharCount > 63) {
return false;
}
}
}
return true;
}
/**
* <p>Determines whether a string is an IPv4 address as defined by RFC 2373, and under the further
* constraint that it must be a 32-bit address. Though not expressed in the grammar, in order to
* satisfy the 32-bit address constraint, each segment of the address cannot be greater than 255
* (8 bits of information).</p>
* <p/>
* <p><code>IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT</code></p>
*
* @return true if the string is a syntactically valid IPv4 address
*/
public static boolean isWellFormedIPv4Address(String address) {
int addrLength = address.length();
char testChar;
int numDots = 0;
int numDigits = 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
//
// RFC 2732 amended RFC 2396 by replacing the definition
// of IPv4address with the one defined by RFC 2373. - mrglavas
//
// IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
//
// One to three digits must be in each segment.
for (int i = 0; i < addrLength; i++) {
testChar = address.charAt(i);
if (testChar == '.') {
if ((i > 0 && !isDigit(address.charAt(i - 1))) ||
(i + 1 < addrLength && !isDigit(address.charAt(i + 1)))) {
return false;
}
numDigits = 0;
if (++numDots > 3) {
return false;
}
} else if (!isDigit(testChar)) {
return false;
}
// Check that that there are no more than three digits
// in this segment.
else if (++numDigits > 3) {
return false;
}
// Check that this segment is not greater than 255.
else if (numDigits == 3) {
char first = address.charAt(i - 2);
char second = address.charAt(i - 1);
if (!(first < '2' ||
(first == '2' &&
(second < '5' ||
(second == '5' && testChar <= '5'))))) {
return false;
}
}
}
return (numDots == 3);
}
/**
* <p>Determines whether a string is an IPv6 reference as defined by RFC 2732, where IPv6address
* is defined in RFC 2373. The IPv6 address is parsed according to Section 2.2 of RFC 2373, with
* the additional constraint that the address be composed of 128 bits of information.</p>
* <p/>
* <p><code>IPv6reference = "[" IPv6address "]"</code></p>
* <p/>
* <p>Note: The BNF expressed in RFC 2373 Appendix B does not accurately describe section 2.2, and
* was in fact removed from RFC 3513, the successor of RFC 2373.</p>
*
* @return true if the string is a syntactically valid IPv6 reference
*/
public static boolean isWellFormedIPv6Reference(String address) {
int addrLength = address.length();
int index = 1;
int end = addrLength - 1;
// Check if string is a potential match for IPv6reference.
if (!(addrLength > 2 && address.charAt(0) == '['
&& address.charAt(end) == ']')) {
return false;
}
// Counter for the number of 16-bit sections read in the address.
int [] counter = new int[1];
// Scan hex sequence before possible '::' or IPv4 address.
index = scanHexSequence(address, index, end, counter);
if (index == -1) {
return false;
}
// Address must contain 128-bits of information.
else if (index == end) {
return (counter[0] == 8);
}
if (index + 1 < end && address.charAt(index) == ':') {
if (address.charAt(index + 1) == ':') {
// '::' represents at least one 16-bit group of zeros.
if (++counter[0] > 8) {
return false;
}
index += 2;
// Trailing zeros will fill out the rest of the address.
if (index == end) {
return true;
}
}
// If the second character wasn't ':', in order to be valid,
// the remainder of the string must match IPv4Address,
// and we must have read exactly 6 16-bit groups.
else {
return (counter[0] == 6) &&
isWellFormedIPv4Address(address.substring(index + 1, end));
}
} else {
return false;
}
// 3. Scan hex sequence after '::'.
int prevCount = counter[0];
index = scanHexSequence(address, index, end, counter);
// We've either reached the end of the string, the address ends in
// an IPv4 address, or it is invalid. scanHexSequence has already
// made sure that we have the right number of bits.
return (index == end) ||
(index != -1 && isWellFormedIPv4Address(
address.substring((counter[0] > prevCount) ? index + 1 : index, end)));
}
/**
* Helper method for isWellFormedIPv6Reference which scans the hex sequences of an IPv6 address.
* It returns the index of the next character to scan in the address, or -1 if the string cannot
* match a valid IPv6 address.
*
* @param address the string to be scanned
* @param index the beginning index (inclusive)
* @param end the ending index (exclusive)
* @param counter a counter for the number of 16-bit sections read in the address
* @return the index of the next character to scan, or -1 if the string cannot match a valid IPv6
* address
*/
private static int scanHexSequence(String address, int index, int end, int [] counter) {
char testChar;
int numDigits = 0;
int start = index;
// Trying to match the following productions:
// hexseq = hex4 *( ":" hex4)
// hex4 = 1*4HEXDIG
for (; index < end; ++index) {
testChar = address.charAt(index);
if (testChar == ':') {
// IPv6 addresses are 128-bit, so there can be at most eight sections.
if (numDigits > 0 && ++counter[0] > 8) {
return -1;
}
// This could be '::'.
if (numDigits == 0 || ((index + 1 < end) && address.charAt(index + 1) == ':')) {
return index;
}
numDigits = 0;
}
// This might be invalid or an IPv4address. If it's potentially an IPv4address,
// backup to just after the last valid character that matches hexseq.
else if (!isHex(testChar)) {
if (testChar == '.' && numDigits < 4 && numDigits > 0 && counter[0] <= 6) {
int back = index - numDigits - 1;
return (back >= start) ? back : (back + 1);
}
return -1;
}
// There can be at most 4 hex digits per group.
else if (++numDigits > 4) {
return -1;
}
}
return (numDigits > 0 && ++counter[0] <= 8) ? end : -1;
}
/**
* Determine whether a char is a digit.
*
* @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.
*
* @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 (p_char <= 'f' && (fgLookupTable[p_char] & ASCII_HEX_CHARACTERS) != 0);
}
/**
* Determine whether a char is an alphabetic character: a-z or A-Z
*
* @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
*
* @return true if the char is alphanumeric, false otherwise
*/
private static boolean isAlphanum(char p_char) {
return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_ALPHA_NUMERIC) != 0);
}
/**
* Determine whether a char is a URI character (reserved or unreserved, not including '%' for
* escaped octets).
*
* @return true if the char is a URI character, false otherwise
*/
private static boolean isURICharacter(char p_char) {
return (p_char <= '~' && (fgLookupTable[p_char] & MASK_URI_CHARACTER) != 0);
}
/**
* Determine whether a char is a scheme character.
*
* @return true if the char is a scheme character, false otherwise
*/
private static boolean isSchemeCharacter(char p_char) {
return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_SCHEME_CHARACTER) != 0);
}
/**
* Determine whether a char is a userinfo character.
*
* @return true if the char is a userinfo character, false otherwise
*/
private static boolean isUserinfoCharacter(char p_char) {
return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_USERINFO_CHARACTER) != 0);
}
/**
* Determine whether a char is a path character.
*
* @return true if the char is a path character, false otherwise
*/
private static boolean isPathCharacter(char p_char) {
return (p_char <= '~' && (fgLookupTable[p_char] & MASK_PATH_CHARACTER) != 0);
}
/**
* 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.
*
* @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 (!isURICharacter(testChar)) {
return false;
}
}
return true;
}
}