MultiConnector


1   /* MultiConnector.java */
2   
3   package org.quilt.graph;
4   
5   /** 
6    * A Connector holding a array of edges, where the array has at least
7    * one member.  The first element of the array is preferred.
8    *
9    * @author <a HREF="jddixon@users.sourceforge.net">Jim Dixon</a>
10   */
11  
12  public class MultiConnector extends Connector {
13  
14      /** Fixed-size array of directed edges. */
15      private Edge [] edges = null;
16  
17      /** Source of all edges in this connector. */
18      private Vertex source = null;
19      
20      /**
21       * Constructor for fixed-size array of edges.  All edges in
22       * the new connector are copies of the seed edge.
23       */
24      public MultiConnector (Edge seed, int n) {
25          if ( seed == null || n < 1) {
26              throw new IllegalArgumentException  (
27                      "constructor arguments null or not in range");
28          }
29          Vertex source = seed.getSource();
30          source = seed.getSource();
31          Vertex target = seed.getTarget();
32          edges = new Edge[n];
33  
34          edges[0] = new Edge (seed);            // copy it
35          for (int i = 1; i < n; i++) {
36              edges[i] = new Edge (source, target);
37          }
38      }
39      /**
40       * Constructor initialized from an existing UnaryConnector.
41       * The unary connector is destroyed after constructing the
42       * new connector.
43       */
44      public MultiConnector( Connector conn, int n) {
45          // will throw NPE if conn == null
46          this( conn.getEdge(), n);
47      }
48      // INTERFACE CONNECTOR //////////////////////////////////////////
49      public Edge getEdge () {
50          return edges[0];
51      }
52      public Vertex getTarget () {
53          return edges[0].getTarget();
54      }
55      public void setTarget (Vertex v) {
56          checkTarget(v);
57          edges[0].setTarget(v);
58      }
59      // OTHER METHODS ////////////////////////////////////////////////
60      private void checkTarget (final Vertex target) {
61          if (target == null) {
62              throw new IllegalArgumentException  ("target may not be null");
63          }
64          if ( target.getGraph() != source.getGraph() ) {
65              throw new IllegalArgumentException  (
66                      "new target must be in same graph");
67          }
68      }
69      private void rangeCheck (int n) {
70          if ( n < 0 || n >= edges.length ) {
71              throw new IllegalArgumentException  (
72                   "MultiConnector index out of range");
73          }
74      }
75      public Edge getEdge (int n) {
76          rangeCheck(n);
77          return edges[n];
78      }
79      public Vertex getTarget (int n) {
80          rangeCheck(n);
81          return edges[n].getTarget();
82      }
83      public void setTarget (Vertex v, int n) {
84          checkTarget(v);
85          rangeCheck(n);
86          edges[n].setTarget(v);
87      }
88  
89      
90      /** @return The number of edges in the Connector. */
91      public int size () {
92          return edges.length;
93      }
94  }
95
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