Module org.jgrapht.io
Package org.jgrapht.nio.dimacs

Enum DIMACSFormat

java.lang.Object
java.lang.Enum<DIMACSFormat>
org.jgrapht.nio.dimacs.DIMACSFormat
All Implemented Interfaces:
Serializable, Comparable<DIMACSFormat>, java.lang.constant.Constable
public enum DIMACSFormat extends Enum<DIMACSFormat>
DIMACS challenge format.

For a general description of the formats see http://dimacs.rutgers.edu/Challenges. Note that there are a lot of different formats based on each different challenge.

Author:
Dimitrios Michail

  • Enum Constant Details

    • SHORTEST_PATH

      public static final DIMACSFormat SHORTEST_PATH
      Shortest path challenge format.

      This is the format used in the 9th DIMACS implementation challenge. A shortest path graph file looks as follows: 

       
 c <comments>
 p sp <number of nodes> <number of edges>
 a <edge source 1> <edge target 1>
 a <edge source 2> <edge target 2>
 a <edge source 3> <edge target 3>
 a <edge source 4> <edge target 4>
 ...
      A weighted variant where each edge has a floating-point weight is also supported: 
       
 a <edge source 1> <edge target 1> <edge_weight>

    • MAX_CLIQUE

      public static final DIMACSFormat MAX_CLIQUE
      Max-clique challenge format.

      This is the format used in the 2nd DIMACS implementation challenge. A graph file looks as follows: 

       
 c <comments>
 p edge <number of nodes> <number of edges>
 e <edge source 1> <edge target 1>
 e <edge source 2> <edge target 2>
 e <edge source 3> <edge target 3>
 e <edge source 4> <edge target 4>
 ...
      A weighted variant where each edge has a floating-point weight is also supported: 
       
 e <edge source 1> <edge target 1> <edge_weight>

    • COLORING

      public static final DIMACSFormat COLORING
      Coloring format.

      This is the format used in the 2nd DIMACS implementation challenge. Same as the MAX_CLIQUE but uses "col" instead of "edge" in the problem definition line.

  • Method Details

    • values

      public static DIMACSFormat[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      Returns:
      an array containing the constants of this enum type, in the order they are declared

    • valueOf

      public static DIMACSFormat valueOf(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:
      IllegalArgumentException - if this enum type has no constant with the specified name
      NullPointerException - if the argument is null

    • getProblem

      public String getProblem()
      Get the name of the problem.
      Returns:
      the name of the problem.

    • getEdgeDescriptor

      public String getEdgeDescriptor()
      Get the edge descriptor used in the format.
      Returns:
      the edge descriptor