Package com.apicatalog.rdf.canon

Enum Position

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<Position>
    enum Position
extends java.lang.Enum<Position>
    Enumeration of positions in an RDF quad.

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      GRAPH
      The graph the quad belongs to.
      OBJECT
      The object of the quad.
      PREDICATE
      The predicate of the quad.
      SUBJECT
      The subject of the quad.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.util.Set<Position> CAN_BE_BLANK
      Set of positions in a quad which can be blank.
      private byte tag
      The tag used to represent the position in hashes.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private Position​(char ch)  

    • Method Summary

      All Methods Static Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      (package private) abstract java.lang.String get​(Quad quad)
      Get the value at this position in the quad.
      (package private) abstract boolean isBlank​(Quad quad)
      Is the value at this position in the quad a blank node identifier?.
      (package private) abstract void set​(Quad quad, java.lang.String value, Blank blank)  
      byte tag()
      Get the tag to include in hashes to represent this position.
      static Position valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static Position[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.

      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Enum Constant Detail

      • SUBJECT

        public static final Position SUBJECT
        The subject of the quad.

      • OBJECT

        public static final Position OBJECT
        The object of the quad.

      • GRAPH

        public static final Position GRAPH
        The graph the quad belongs to.

      • PREDICATE

        public static final Position PREDICATE
        The predicate of the quad. Note the predicate is not used by the URDNA-2015 algorithm.

    • Field Detail

      • CAN_BE_BLANK

        public static final java.util.Set<Position> CAN_BE_BLANK
        Set of positions in a quad which can be blank.

      • tag

        private final byte tag
        The tag used to represent the position in hashes.

    • Constructor Detail

      • Position

        private Position​(char ch)

    • Method Detail

      • values

        public static Position[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (Position c : Position.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static Position valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null

      • get

        abstract java.lang.String get​(Quad quad)
        Get the value at this position in the quad.
        Parameters:
        quad - the quad
        Returns:
        the value at this position

      • isBlank

        abstract boolean isBlank​(Quad quad)
        Is the value at this position in the quad a blank node identifier?.
        Parameters:
        quad - the quad
        Returns:
        true if this position holds a blank node identifier.

      • set

        abstract void set​(Quad quad,
                  java.lang.String value,
                  Blank blank)

      • tag

        public byte tag()
        Get the tag to include in hashes to represent this position.
        Returns:
        the tag