Line


1   /*
2    * Created on Mar 16, 2004
3    */
4   package org.objectweb.proactive.core.group.topology;
5   
6   import org.objectweb.proactive.core.group.Group;
7   import org.objectweb.proactive.core.mop.ConstructionOfReifiedObjectFailedException;
8   
9   
10  /**
11   * This class represents a group by a one-dimensional topology.
12   *
13   * @author Laurent Baduel
14   */
15  public class Line extends TopologyGroup { // implements Topology1D {
16  
17      /** size of the one-dimensional topology group */
18      protected int width;
19  
20      /**
21       * Construtor. The members of <code>g</code> are used to fill the topology group.
22       * @param g - the group used a base for the new group (topology)
23       * @param size - the dimension (max number of member in the topolody group)
24       * @throws ConstructionOfReifiedObjectFailedException
25       */
26      public Line(Group g, int size)
27          throws ConstructionOfReifiedObjectFailedException {
28          super(g, size);
29          this.width = size;
30      }
31  
32      /**
33       * Return the max size of the line
34       * @return the max size of the one-dimensional topology group (i.e. the line)
35       */
36      public int getWidth() {
37          return this.width;
38      }
39  
40      /**
41       * Returns the position of the specified object
42       * @param o - the object
43       * @return the position of the object in the line
44       */
45      public int getX(Object   o) {
46          return this.indexOf(o);
47      }
48  
49      /**
50       * Returns the object at the left of the specified object in the one-dimensional topology group
51       * @param o - the specified object
52       * @return the object at the left of <code>o<code>. If there is no object at the left of <code>o</code>, return <code>null</code>
53       */
54      public Object   left(Object   o) {
55          int position = this.indexOf(o);
56          if (position != 0) {
57              return this.get(position - 1);
58          } else {
59              return null;
60          }
61      }
62  
63      /**
64       * Returns the object at the right of the specified object in the one-dimensional topology group
65       * @param o - the specified object
66       * @return the object at the right of <code>o<code>. If there is no object at the right of <code>o</code>, return <code>null</code>
67       */
68      public Object   right(Object   o) {
69          int position = this.indexOf(o);
70          if (position != this.getWidth()) {
71              return this.get(position + 1);
72          } else {
73              return null;
74          }
75      }
76  }
77
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