java.lang.Object
org.htmlunit.cyberneko.xerces.util.URI

public class URI extends Object
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.

Parsing of a URI specification is done according to the URI syntax described in RFC 2396, and amended by RFC 2732.

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.

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.

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.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static class 
    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.
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final int
    ASCII letter characters
    private static final int
    ASCII digit characters
    private static final int
    ASCII hex characters
    private static final byte[]
     
    private String
    If specified, stores the fragment for this URI; otherwise null
    private String
    If specified, stores the host for this URI; otherwise null
    private static final int
    URI punctuation mark characters: -_.!~*'() - these, combined with alphanumerics, constitute the "unreserved" characters
    private static final int
    Mask for alpha-numeric characters
    private static final int
    Mask for path characters
    private static final int
    Mask for scheme characters
    private static final int
    Mask for unreserved characters
    private static final int
    Mask for URI allowable characters except for %
    private static final int
    Mask for userinfo characters
    private String
    If specified, stores the path for this URI; otherwise null
    private static final int
    Path characters
    private int
    If specified, stores the port for this URI; otherwise -1
    private String
    If specified, stores the query string for this URI; otherwise null.
    private String
    If specified, stores the registry based authority for this URI; otherwise -1
    private static final int
    reserved characters ;/?:@invalid input: '&'=+$,[]
    private String
    Stores the scheme (usually the protocol) for this URI.
    private static final int
    scheme can be composed of alphanumerics and these characters: +-.
    private String
    If specified, stores the userinfo for this URI; otherwise null
    private static final int
    userinfo can be composed of unreserved, escaped and these characters: ;:invalid input: '&'=+$,
  • Constructor Summary

    Constructors
    Constructor
    Description
    URI(String uriSpec)
    Construct a new URI from a URI specification string.
    URI(String uriSpec, boolean allowNonAbsoluteURI)
    Construct a new URI from a URI specification string.
    URI(String scheme, String userinfo, String host, int port, String path, String queryString, String fragment)
    Construct a new URI that follows the generic URI syntax from its component parts.
    URI(String scheme, String host, String path, String queryString, String fragment)
    Construct a new URI that follows the generic URI syntax from its component parts.
    URI(URI base, String uriSpec)
    Construct a new URI from a base URI and a URI specification string.
    URI(URI base, String uriSpec, boolean allowNonAbsoluteURI)
    Construct a new URI from a base URI and a URI specification string.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    Absolutize URI with given base URI.
    boolean
    equals(Object test)
    Determines if the passed-in Object is equivalent to this URI.
    Get the fragment for this URI.
    Get the host for this URI.
    Get the path for this URI.
    int
    Get the port for this URI.
    Get the query string for this URI.
    Get the registry based authority for this URI.
    Get the scheme for this URI.
    Get the scheme-specific part for this URI (everything following the scheme and the first colon).
    Get the userinfo for this URI.
    private void
    initialize(URI other)
    Initialize all fields of this URI from another URI.
    private void
    initialize(URI base, String uriSpec)
    Initializes this URI from a base URI and a URI specification string.
    private void
    initialize(URI base, String uriSpec, boolean allowNonAbsoluteURI)
    Initializes this URI from a base URI and a URI specification string.
    private boolean
    Initialize the authority (either server or registry based) for this URI from a URI string spec.
    private void
    initializePath(String uriSpec, int nStartIndex)
    Initialize the path for this URI from a URI string spec.
    private void
    Initialize the scheme for this URI from a URI string spec.
    boolean
    Returns whether this URI represents an absolute URI.
    private static boolean
    isAlpha(char ch)
    Determine whether a char is an alphabetic character: a-z or A-Z
    private static boolean
    isAlphanum(char ch)
    Determine whether a char is an alphanumeric: 0-9, a-z or A-Z
    private static boolean
    Determine whether a scheme conforms to the rules for a scheme name.
    private static boolean
    isDigit(char chr)
    Determine whether a char is a digit.
    boolean
    Get the indicator as to whether this URI uses the "generic URI" syntax.
    private static boolean
    isHex(char ch)
    Determine whether a character is a hexadecimal character.
    private static boolean
    isPathCharacter(char ch)
    Determine whether a char is a path character.
    private static boolean
    Determine whether a char is a scheme character.
    private static boolean
    isURICharacter(char ch)
    Determine whether a char is a URI character (reserved or unreserved, not including '%' for escaped octets).
    private static boolean
    Determine whether a given string contains only URI characters (also called "uric" in RFC 2396).
    private static boolean
    Determine whether a char is a userinfo character.
    private boolean
    Determines whether the given string is a registry based authority.
    private boolean
    isValidServerBasedAuthority(String host, int port, String userinfo)
    Determines whether the components host, port, and user info are valid as a server authority.
    static boolean
    Determine whether a string is syntactically capable of representing a valid IPv4 address, IPv6 reference or the domain name of a network host.
    static boolean
    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.
    static boolean
    Determines whether a string is an IPv6 reference as defined by RFC 2732, where IPv6address is defined in RFC 2373.
    private static int
    scanHexSequence(String address, int index, int end, int[] counter)
    Helper method for isWellFormedIPv6Reference which scans the hex sequences of an IPv6 address.
    void
    setFragment(String fragment)
    Set the fragment for this URI.
    void
    Set the host for this URI.
    void
    Set the path for this URI.
    void
    setPort(int port)
    Set the port for this URI.
    void
    setQueryString(String queryString)
    Set the query string for this URI.
    void
    setScheme(String scheme)
    Set the scheme for this URI.
    void
    setUserinfo(String userinfo)
    Set the userinfo for this URI.
    Get the URI as a string specification.

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
  • Field Details

    • fgLookupTable

      private static final byte[] fgLookupTable
    • RESERVED_CHARACTERS

      private static final int RESERVED_CHARACTERS
      reserved characters ;/?:@invalid input: '&'=+$,[]
      See Also:
    • MARK_CHARACTERS

      private static final int MARK_CHARACTERS
      URI punctuation mark characters: -_.!~*'() - these, combined with alphanumerics, constitute the "unreserved" characters
      See Also:
    • SCHEME_CHARACTERS

      private static final int SCHEME_CHARACTERS
      scheme can be composed of alphanumerics and these characters: +-.
      See Also:
    • USERINFO_CHARACTERS

      private static final int USERINFO_CHARACTERS
      userinfo can be composed of unreserved, escaped and these characters: ;:invalid input: '&'=+$,
      See Also:
    • ASCII_ALPHA_CHARACTERS

      private static final int ASCII_ALPHA_CHARACTERS
      ASCII letter characters
      See Also:
    • ASCII_DIGIT_CHARACTERS

      private static final int ASCII_DIGIT_CHARACTERS
      ASCII digit characters
      See Also:
    • ASCII_HEX_CHARACTERS

      private static final int ASCII_HEX_CHARACTERS
      ASCII hex characters
      See Also:
    • PATH_CHARACTERS

      private static final int PATH_CHARACTERS
      Path characters
      See Also:
    • MASK_ALPHA_NUMERIC

      private static final int MASK_ALPHA_NUMERIC
      Mask for alpha-numeric characters
      See Also:
    • MASK_UNRESERVED_MASK

      private static final int MASK_UNRESERVED_MASK
      Mask for unreserved characters
      See Also:
    • MASK_URI_CHARACTER

      private static final int MASK_URI_CHARACTER
      Mask for URI allowable characters except for %
      See Also:
    • MASK_SCHEME_CHARACTER

      private static final int MASK_SCHEME_CHARACTER
      Mask for scheme characters
      See Also:
    • MASK_USERINFO_CHARACTER

      private static final int MASK_USERINFO_CHARACTER
      Mask for userinfo characters
      See Also:
    • MASK_PATH_CHARACTER

      private static final int MASK_PATH_CHARACTER
      Mask for path characters
      See Also:
    • scheme_

      private String scheme_
      Stores the scheme (usually the protocol) for this URI.
    • userinfo_

      private String userinfo_
      If specified, stores the userinfo for this URI; otherwise null
    • host_

      private String host_
      If specified, stores the host for this URI; otherwise null
    • port_

      private int port_
      If specified, stores the port for this URI; otherwise -1
    • regAuthority_

      private String regAuthority_
      If specified, stores the registry based authority for this URI; otherwise -1
    • path_

      private String path_
      If specified, stores the path for this URI; otherwise null
    • queryString_

      private String queryString_
      If specified, stores the query string for this URI; otherwise null.
    • fragment_

      private String fragment_
      If specified, stores the fragment for this URI; otherwise null
  • Constructor Details

    • URI

      public URI(String uriSpec) throws URI.MalformedURIException
      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.
      Parameters:
      uriSpec - the URI specification string (cannot be null or empty)
      Throws:
      URI.MalformedURIException - if p_uriSpec violates any syntax rules
    • URI

      public URI(String uriSpec, boolean allowNonAbsoluteURI) throws URI.MalformedURIException
      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. Construct a relative URI if boolean is assigned to "true" and p_uriSpec is not valid absolute URI, instead of throwing an exception.
      Parameters:
      uriSpec - the URI specification string (cannot be null or empty)
      allowNonAbsoluteURI - true to permit non-absolute URIs, false otherwise.
      Throws:
      URI.MalformedURIException - if p_uriSpec violates any syntax rules
    • URI

      public URI(URI base, String uriSpec) throws URI.MalformedURIException
      Construct a new URI from a base URI and a URI specification string. The URI specification string may be a relative URI.
      Parameters:
      base - the base URI (cannot be null if p_uriSpec is null or empty)
      uriSpec - the URI specification string (cannot be null or empty if p_base is null)
      Throws:
      URI.MalformedURIException - if p_uriSpec violates any syntax rules
    • URI

      public URI(URI base, String uriSpec, boolean allowNonAbsoluteURI) throws URI.MalformedURIException
      Construct a new URI from a base URI and a URI specification string. The URI specification string may be a relative URI. Construct a relative URI if boolean is assigned to "true" and p_uriSpec is not valid absolute URI and p_base is null instead of throwing an exception.
      Parameters:
      base - the base URI (cannot be null if p_uriSpec is null or empty)
      uriSpec - the URI specification string (cannot be null or empty if p_base is null)
      allowNonAbsoluteURI - true to permit non-absolute URIs, false otherwise.
      Throws:
      URI.MalformedURIException - if p_uriSpec violates any syntax rules
    • URI

      public URI(String scheme, String host, String path, String queryString, String fragment) throws URI.MalformedURIException
      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.
      Parameters:
      scheme - the URI scheme (cannot be null or empty)
      host - the hostname, IPv4 address or IPv6 reference for the URI
      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
      queryString - the URI query string (cannot be specified if path is null)
      fragment - the URI fragment (cannot be specified if path is null)
      Throws:
      URI.MalformedURIException - if any of the parameters violates syntax rules or semantic rules
    • URI

      public URI(String scheme, String userinfo, String host, int port, String path, String queryString, String fragment) throws URI.MalformedURIException
      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.
      Parameters:
      scheme - the URI scheme (cannot be null or empty)
      userinfo - the URI userinfo (cannot be specified if host is null)
      host - the hostname, IPv4 address or IPv6 reference for the URI
      port - the URI port (may be -1 for "unspecified"; cannot be specified if host is null)
      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
      queryString - the URI query string (cannot be specified if path is null)
      fragment - the URI fragment (cannot be specified if path is null)
      Throws:
      URI.MalformedURIException - if any of the parameters violates syntax rules or semantic rules
  • Method Details

    • initialize

      private void initialize(URI other)
      Initialize all fields of this URI from another URI.
      Parameters:
      other - the URI to copy (cannot be null)
    • initialize

      private void initialize(URI base, String uriSpec, boolean allowNonAbsoluteURI) throws URI.MalformedURIException
      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.
      Parameters:
      base - the base URI (may be null if p_uriSpec is an absolute URI)
      uriSpec - the URI spec string which may be an absolute or relative URI (can only be null/empty if p_base is not null)
      allowNonAbsoluteURI - true to permit non-absolute URIs, in case of relative URI, false otherwise.
      Throws:
      URI.MalformedURIException - if p_base is null and p_uriSpec is not an absolute URI or if p_uriSpec violates syntax rules
    • initialize

      private void initialize(URI base, String uriSpec) throws URI.MalformedURIException
      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.
      Parameters:
      base - the base URI (may be null if p_uriSpec is an absolute URI)
      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:
      URI.MalformedURIException - if p_base is null and p_uriSpec is not an absolute URI or if p_uriSpec violates syntax rules
    • absolutize

      public void absolutize(URI base)
      Absolutize URI with given base URI.
      Parameters:
      base - base URI for absolutization
    • initializeScheme

      private void initializeScheme(String uriSpec) throws URI.MalformedURIException
      Initialize the scheme for this URI from a URI string spec.
      Parameters:
      uriSpec - the URI specification (cannot be null)
      Throws:
      URI.MalformedURIException - if URI does not have a conformant scheme
    • initializeAuthority

      private boolean initializeAuthority(String uriSpec)
      Initialize the authority (either server or registry based) for this URI from a URI string spec.
      Parameters:
      uriSpec - the URI specification (cannot be null)
      Returns:
      true if the given string matched server or registry based authority
    • isValidServerBasedAuthority

      private boolean isValidServerBasedAuthority(String host, int port, String userinfo)
      Determines whether the components host, port, and user info are valid as a server authority.
      Parameters:
      host - the host component of authority
      port - the port number component of authority
      userinfo - the user info component of authority
      Returns:
      true if the given host, port, and userinfo compose a valid server authority
    • isValidRegistryBasedAuthority

      private boolean isValidRegistryBasedAuthority(String authority)
      Determines whether the given string is a registry based authority.
      Parameters:
      authority - the authority component of a URI
      Returns:
      true if the given string is a registry based authority
    • initializePath

      private void initializePath(String uriSpec, int nStartIndex) throws URI.MalformedURIException
      Initialize the path for this URI from a URI string spec.
      Parameters:
      uriSpec - the URI specification (cannot be null)
      nStartIndex - the index to begin scanning from
      Throws:
      URI.MalformedURIException - if p_uriSpec violates syntax rules
    • getScheme

      public String getScheme()
      Get the scheme for this URI.
      Returns:
      the scheme for this URI
    • getSchemeSpecificPart

      public String getSchemeSpecificPart()
      Get the scheme-specific part for this URI (everything following the scheme and the first colon). See RFC 2396 Section 5.2 for spec.
      Returns:
      the scheme-specific part for this URI
    • getUserinfo

      public String getUserinfo()
      Get the userinfo for this URI.
      Returns:
      the userinfo for this URI (null if not specified).
    • getHost

      public String getHost()
      Get the host for this URI.
      Returns:
      the host for this URI (null if not specified).
    • getPort

      public int getPort()
      Get the port for this URI.
      Returns:
      the port for this URI (-1 if not specified).
    • getRegBasedAuthority

      public String getRegBasedAuthority()
      Get the registry based authority for this URI.
      Returns:
      the registry based authority (null if not specified).
    • getPath

      public String getPath()
      Get the path for this URI. Note that the value returned is the path only and does not include the query string or fragment.
      Returns:
      the path for this URI.
    • getQueryString

      public String getQueryString()
      Get the query string for this URI.
      Returns:
      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.
    • getFragment

      public String getFragment()
      Get the fragment for this URI.
      Returns:
      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.
    • setScheme

      public void setScheme(String scheme) throws URI.MalformedURIException
      Set the scheme for this URI. The scheme is converted to lowercase before it is set.
      Parameters:
      scheme - the scheme for this URI (cannot be null)
      Throws:
      URI.MalformedURIException - if p_scheme is not a conformant scheme name
    • setUserinfo

      public void setUserinfo(String userinfo) throws URI.MalformedURIException
      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.
      Parameters:
      userinfo - the userinfo for this URI
      Throws:
      URI.MalformedURIException - if p_userinfo contains invalid characters
    • setHost

      public void setHost(String host) throws URI.MalformedURIException

      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.

      Note: This method overwrites registry based authority if it previously existed in this URI.

      Parameters:
      host - the host for this URI
      Throws:
      URI.MalformedURIException - if p_host is not a valid IP address or DNS hostname.
    • setPort

      public void setPort(int port) throws URI.MalformedURIException
      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.
      Parameters:
      port - the port number for this URI
      Throws:
      URI.MalformedURIException - if p_port is not -1 and not a valid port number
    • setPath

      public void setPath(String path) throws URI.MalformedURIException
      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.
      Parameters:
      path - the path for this URI (may be null)
      Throws:
      URI.MalformedURIException - if p_path contains invalid characters
    • setQueryString

      public void setQueryString(String queryString) throws URI.MalformedURIException
      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.
      Parameters:
      queryString - the query string for this URI
      Throws:
      URI.MalformedURIException - if p_queryString is not null and this URI does not conform to the generic URI syntax or if the path is null
    • setFragment

      public void setFragment(String fragment) throws URI.MalformedURIException
      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.
      Parameters:
      fragment - the fragment for this URI
      Throws:
      URI.MalformedURIException - if p_fragment is not null and this URI does not conform to the generic URI syntax or if the path is null
    • equals

      public boolean equals(Object test)
      Determines if the passed-in Object is equivalent to this URI.
      Overrides:
      equals in class Object
      Parameters:
      test - the Object to test for equality.
      Returns:
      true if p_test is a URI with all values equal to this URI, false otherwise
    • toString

      public String toString()
      Get the URI as a string specification. See RFC 2396 Section 5.2.
      Overrides:
      toString in class Object
      Returns:
      the URI string specification
    • isGenericURI

      public boolean isGenericURI()
      Get the indicator as to whether this URI uses the "generic URI" syntax.
      Returns:
      true if this URI uses the "generic URI" syntax, false otherwise
    • isAbsoluteURI

      public boolean isAbsoluteURI()
      Returns whether this URI represents an absolute URI.
      Returns:
      true if this URI represents an absolute URI, false otherwise
    • isConformantSchemeName

      private static boolean isConformantSchemeName(String scheme)
      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 '.'.
      Parameters:
      scheme - the scheme
      Returns:
      true if the scheme is conformant, false otherwise
    • isWellFormedAddress

      public static boolean isWellFormedAddress(String address)
      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.
      Parameters:
      address - the address
      Returns:
      true if the string is a syntactically valid IPv4 address, IPv6 reference or hostname
    • isWellFormedIPv4Address

      public static boolean isWellFormedIPv4Address(String address)

      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).

      IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT

      Parameters:
      address - the address
      Returns:
      true if the string is a syntactically valid IPv4 address
    • isWellFormedIPv6Reference

      public static boolean isWellFormedIPv6Reference(String address)

      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.

      IPv6reference = "[" IPv6address "]"

      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.

      Parameters:
      address - the address
      Returns:
      true if the string is a syntactically valid IPv6 reference
    • scanHexSequence

      private static int scanHexSequence(String address, int index, int end, int[] counter)
      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.
      Parameters:
      address - the string to be scanned
      index - the beginning index (inclusive)
      end - the ending index (exclusive)
      counter - a counter for the number of 16-bit sections read in the address
      Returns:
      the index of the next character to scan, or -1 if the string cannot match a valid IPv6 address
    • isDigit

      private static boolean isDigit(char chr)
      Determine whether a char is a digit.
      Returns:
      true if the char is betweeen '0' and '9', false otherwise
    • isHex

      private static boolean isHex(char ch)
      Determine whether a character is a hexadecimal character.
      Returns:
      true if the char is betweeen '0' and '9', 'a' and 'f' or 'A' and 'F', false otherwise
    • isAlpha

      private static boolean isAlpha(char ch)
      Determine whether a char is an alphabetic character: a-z or A-Z
      Returns:
      true if the char is alphabetic, false otherwise
    • isAlphanum

      private static boolean isAlphanum(char ch)
      Determine whether a char is an alphanumeric: 0-9, a-z or A-Z
      Returns:
      true if the char is alphanumeric, false otherwise
    • isURICharacter

      private static boolean isURICharacter(char ch)
      Determine whether a char is a URI character (reserved or unreserved, not including '%' for escaped octets).
      Returns:
      true if the char is a URI character, false otherwise
    • isSchemeCharacter

      private static boolean isSchemeCharacter(char ch)
      Determine whether a char is a scheme character.
      Returns:
      true if the char is a scheme character, false otherwise
    • isUserinfoCharacter

      private static boolean isUserinfoCharacter(char ch)
      Determine whether a char is a userinfo character.
      Returns:
      true if the char is a userinfo character, false otherwise
    • isPathCharacter

      private static boolean isPathCharacter(char ch)
      Determine whether a char is a path character.
      Returns:
      true if the char is a path character, false otherwise
    • isURIString

      private static boolean isURIString(String uric)
      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.
      Returns:
      true if the string is comprised of uric, false otherwise