Package org.eclipse.rdf4j.rio.turtle

Class TurtleUtil

java.lang.Object
org.eclipse.rdf4j.rio.turtle.TurtleUtil
public class TurtleUtil extends Object
Utility methods for Turtle encoding/decoding.
See Also:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final char[]
    LOCAL_ESCAPED_CHARS
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    TurtleUtil()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static String
    decodeString(String s)
    Decodes an encoded Turtle string.
    static String
    encodeLongString(String s)
    Encodes the supplied string for inclusion as a long string in a Turtle document.
    static String
    encodeString(String s)
    Encodes the supplied string for inclusion as a 'normal' string in a Turtle document.
    static String
    encodeURIString(String s)
    Deprecated.
    static int
    findURISplitIndex(String uri)
    Tries to find an index where the supplied URI can be split into a namespace and a local name that comply with the serialization constraints of the Turtle format.
    static boolean
    isBLANK_NODE_LABEL_Char(int codePoint)
    Check if the supplied code point represents a valid blank node label character.
    static boolean
    isBLANK_NODE_LABEL_EndChar(int codePoint)
    Check if the supplied code point represents a valid blank node label end character.
    static boolean
    isBLANK_NODE_LABEL_StartChar(int codePoint)
    Check if the supplied code point represents a valid start character for a blank node label.
    static boolean
    isLanguageChar(int codePoint)
    Check if the supplied code point represents a valid language tag character.
    static boolean
    isLanguageStartChar(int codePoint)
    Check if the supplied code point represents a valid language tag start character.
    static boolean
    isLocalEscapedChar(int codePoint)
    Check if the supplied code point represents a valid local escaped character.
    static boolean
    isNameChar(int codePoint)
    Check if the supplied code point represents a valid name character.
    static boolean
    isNameEndChar(int codePoint)
    Check if the supplied code point represents a valid name end character.
    static boolean
    isNameStartChar(int codePoint)
    Check if the supplied code point represents a valid name start character.
    static boolean
    isPERCENT(String name)
     
    static boolean
    isPLX_INTERNAL(String name)
     
    static boolean
    isPLX_START(String name)
     
    static boolean
    isPN_CHARS(int codePoint)
    Check if the supplied code point represents a valid prefixed name character.
    static boolean
    isPN_CHARS_BASE(int codePoint)
    Check if the supplied code point represents a valid prefixed name base character.
    static boolean
    isPN_CHARS_U(int codePoint)
    Check if the supplied code point represents either a valid prefixed name base character or an underscore.
    static boolean
    isPN_LOCAL(String name)
     
    static boolean
    isPN_LOCAL_ESC(String name)
     
    static boolean
    isPN_PREFIX(String prefix)
    Checks if the supplied prefix string is a valid Turtle namespace prefix.
    static boolean
    isPrefixChar(int codePoint)
    Check if the supplied code point represents a valid prefix character.
    static boolean
    isPrefixStartChar(int codePoint)
    Check if the supplied code point represents a valid prefixed name start character.
    static boolean
    isWhitespace(int codePoint)
    Check if the supplied code point represents a whitespace character

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • LOCAL_ESCAPED_CHARS

      public static final char[] LOCAL_ESCAPED_CHARS

  • Constructor Details

    • TurtleUtil

      public TurtleUtil()

  • Method Details

    • findURISplitIndex

      public static int findURISplitIndex(String uri)
      Tries to find an index where the supplied URI can be split into a namespace and a local name that comply with the serialization constraints of the Turtle format.
      Parameters:
      uri - The URI to split.
      Returns:
      The index where the supplied URI can be split, or -1 if the URI cannot be split.

    • isWhitespace

      public static boolean isWhitespace(int codePoint)
      Check if the supplied code point represents a whitespace character
      Parameters:
      codePoint - a Unicode code point
      Returns:
      true if the supplied code point represents a whitespace character, false otherwise.

    • isPN_CHARS_BASE

      public static boolean isPN_CHARS_BASE(int codePoint)
      Check if the supplied code point represents a valid prefixed name base character.

      From Turtle Spec:

      http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS_BASE

      [163s] PN_CHARS_BASE ::= [A-Z] | [a-z] | [#x00C0-#x00D6] | [#x00D8-#x00F6] | [#x00F8-#x02FF] | [#x0370-#x037D] | [#x037F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]

    • isPN_CHARS_U

      public static boolean isPN_CHARS_U(int codePoint)
      Check if the supplied code point represents either a valid prefixed name base character or an underscore.

      From Turtle Spec:

      http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS_U

      [164s] PN_CHARS_U ::= PN_CHARS_BASE | '_'

    • isPN_CHARS

      public static boolean isPN_CHARS(int codePoint)
      Check if the supplied code point represents a valid prefixed name character.

      From Turtle Spec:

      http://www.w3.org/TR/turtle/#grammar-production-PN_CHARS

      [166s] PN_CHARS ::= PN_CHARS_U | '-' | [0-9] | #x00B7 | [#x0300-#x036F] | [#x203F-#x2040]

    • isPrefixStartChar

      public static boolean isPrefixStartChar(int codePoint)
      Check if the supplied code point represents a valid prefixed name start character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid prefixed name start char, false otherwise.

    • isBLANK_NODE_LABEL_StartChar

      public static boolean isBLANK_NODE_LABEL_StartChar(int codePoint)
      Check if the supplied code point represents a valid start character for a blank node label.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid blank node label start char, false otherwise.

    • isBLANK_NODE_LABEL_Char

      public static boolean isBLANK_NODE_LABEL_Char(int codePoint)
      Check if the supplied code point represents a valid blank node label character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid blank node label char, false otherwise.

    • isBLANK_NODE_LABEL_EndChar

      public static boolean isBLANK_NODE_LABEL_EndChar(int codePoint)
      Check if the supplied code point represents a valid blank node label end character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid blank node label end char, false otherwise.

    • isNameStartChar

      public static boolean isNameStartChar(int codePoint)
      Check if the supplied code point represents a valid name start character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid name start char, false otherwise.

    • isNameChar

      public static boolean isNameChar(int codePoint)
      Check if the supplied code point represents a valid name character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid name char, false otherwise.

    • isNameEndChar

      public static boolean isNameEndChar(int codePoint)
      Check if the supplied code point represents a valid name end character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid name end char, false otherwise.

    • isLocalEscapedChar

      public static boolean isLocalEscapedChar(int codePoint)
      Check if the supplied code point represents a valid local escaped character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid local escaped char, false otherwise.

    • isPrefixChar

      public static boolean isPrefixChar(int codePoint)
      Check if the supplied code point represents a valid prefix character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid prefix char, false otherwise.

    • isLanguageStartChar

      public static boolean isLanguageStartChar(int codePoint)
      Check if the supplied code point represents a valid language tag start character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid language tag start char, false otherwise.

    • isLanguageChar

      public static boolean isLanguageChar(int codePoint)
      Check if the supplied code point represents a valid language tag character.
      Parameters:
      codePoint - a Unicode code point.
      Returns:
      true if the supplied code point represents a valid language tag char, false otherwise.

    • isPN_PREFIX

      public static boolean isPN_PREFIX(String prefix)
      Checks if the supplied prefix string is a valid Turtle namespace prefix. From Turtle Spec:

      http://www.w3.org/TR/turtle/#grammar-production-PN_PREFIX

      [167s] PN_PREFIX ::= PN_CHARS_BASE ((PN_CHARS | '.')* PN_CHARS)?

      Parameters:
      prefix - a prefix string.
      Returns:
      true if the supplied prefix conforms to Turtle grammar rules

    • isPLX_START

      public static boolean isPLX_START(String name)

    • isPERCENT

      public static boolean isPERCENT(String name)

    • isPLX_INTERNAL

      public static boolean isPLX_INTERNAL(String name)

    • isPN_LOCAL_ESC

      public static boolean isPN_LOCAL_ESC(String name)

    • isPN_LOCAL

      public static boolean isPN_LOCAL(String name)

    • encodeString

      public static String encodeString(String s)
      Encodes the supplied string for inclusion as a 'normal' string in a Turtle document.
      Parameters:
      s -
      Returns:
      encoded string

    • encodeLongString

      public static String encodeLongString(String s)
      Encodes the supplied string for inclusion as a long string in a Turtle document.
      Parameters:
      s -
      Returns:
      encoded long string

    • encodeURIString

      @Deprecated public static String encodeURIString(String s)
      Deprecated.
      Encodes the supplied string for inclusion as a (relative) URI in a Turtle document.
      Parameters:
      s -

    • decodeString

      public static String decodeString(String s)
      Decodes an encoded Turtle string. Any \-escape sequences are substituted with their decoded value.
      Parameters:
      s - An encoded Turtle string.
      Returns:
      The unencoded string.
      Throws:
      IllegalArgumentException - If the supplied string is not a correctly encoded Turtle string.