clique.java

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package edu.umass.cs.mallet.grmm;

import salvo.jesus.graph.Vertex;

import java.util.Set;
import java.util.Iterator;

/**
 * A clique maintains a set of variables in a specified order.
 *  (Although mathematically, a clique must be fully-connected,
 *  nothing in this datastructure depends on this.)
 *
 * @author Charles Sutton
 * @version $Id: Clique.java,v 1.2 2004/08/13 19:17:37 casutton Exp $ 
 */
public interface Clique extends Set, Vertex, Cloneable {

  /**
   * Returns the variable in this clique at index idx.
   * @param idx
   * @return the variable
   */
  Variable get (int idx);

  /**
   * Returns the variables in this clique as a set.  This set
   *  should not be modified
   * @return Set
   */
  Set vertices();


  /**
   * Returns the variables in this clique as an array, that should
   *  not be modified.
   * @return An array of Variables.
   */
  Variable[] toVariableArray ();


  /**
   *  Returns the number of assignments of this clique.
   */
  int weight ();


  /**
   * Returns an iterator over the assignments to this clique.
   *  Each element in the Iterator is an {@link Assignment} object.
   * @return An iterator over assignments
   */
  AssignmentIterator assignmentIterator ();


  /**
	 * Returns the intersection of two cliques.
	 */
  Set intersection (Clique c);

}