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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/graph/InitialRankSolver.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.graph.InitialRankSolver;
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14
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15 import java.lang.all;
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16 import org.eclipse.draw2d.graph.GraphVisitor;
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17 import org.eclipse.draw2d.graph.DirectedGraph;
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18 import org.eclipse.draw2d.graph.NodeList;
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19 import org.eclipse.draw2d.graph.Node;
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20 import org.eclipse.draw2d.graph.EdgeList;
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21 import org.eclipse.draw2d.graph.Edge;
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22
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23 /**
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24 * Assigns a valid rank assignment to all nodes based on their edges. The assignment is
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25 * not optimal in that it does not provide the minimum global length of edge lengths.
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26 * @author Randy Hudson
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27 * @since 2.1.2
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28 */
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29 class InitialRankSolver : GraphVisitor {
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30
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31 protected DirectedGraph graph;
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32 protected EdgeList candidates;
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33 protected NodeList members;
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34
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35 public this(){
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36 candidates = new EdgeList();
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37 members = new NodeList();
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38 }
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39
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40 public void visit(DirectedGraph graph) {
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41 this.graph = graph;
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42 graph.edges.resetFlags(false);
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43 graph.nodes.resetFlags();
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44 solve();
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45 }
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46
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47 protected void solve() {
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48 if (graph.nodes.size() is 0)
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49 return;
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50 NodeList unranked = new NodeList(graph.nodes);
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51 NodeList rankMe = new NodeList();
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52 Node node;
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53 int i;
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54 while (!unranked.isEmpty()) {
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55 rankMe.clear();
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56 for (i = 0; i < unranked.size();) {
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57 node = unranked.getNode(i);
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58 if (node.incoming.isCompletelyFlagged()) {
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59 rankMe.add(node);
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60 unranked.remove(i);
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61 } else
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62 i++;
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63 }
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64 if (rankMe.size() is 0)
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65 throw new RuntimeException("Cycle detected in graph"); //$NON-NLS-1$
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66 for (i = 0; i < rankMe.size(); i++) {
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67 node = rankMe.getNode(i);
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68 assignMinimumRank(node);
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69 node.outgoing.setFlags(true);
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70 }
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71 }
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72
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73 connectForest();
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74 }
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75
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76 private void connectForest() {
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77 List forest = new ArrayList();
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78 Stack stack = new Stack();
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79 NodeList tree;
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80 graph.nodes.resetFlags();
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81 for (int i = 0; i < graph.nodes.size(); i++) {
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82 Node neighbor, n = graph.nodes.getNode(i);
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83 if (n.flag)
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84 continue;
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85 tree = new NodeList();
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86 stack.push(n);
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87 while (!stack.isEmpty()) {
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88 n = cast(Node) stack.pop();
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89 n.flag = true;
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90 tree.add(n);
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91 for (int s = 0; s < n.incoming.size(); s++) {
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92 neighbor = n.incoming.getEdge(s).source;
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93 if (!neighbor.flag)
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94 stack.push(neighbor);
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95 }
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96 for (int s = 0; s < n.outgoing.size(); s++) {
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97 neighbor = n.outgoing.getEdge(s).target;
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98 if (!neighbor.flag)
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99 stack.push(neighbor);
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100 }
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101 }
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102 forest.add(tree);
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103 }
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104
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105 if (forest.size() > 1) {
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106 //connect the forest
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107 graph.forestRoot = new Node(stringcast("the forest root")); //$NON-NLS-1$
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108 graph.nodes.add(graph.forestRoot);
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109 for (int i = 0; i < forest.size(); i++) {
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110 tree = cast(NodeList) forest.get(i);
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111 graph.edges.add(new Edge(graph.forestRoot, tree.getNode(0), 0, 0));
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112 }
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113 }
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114 }
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115
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116 private void assignMinimumRank(Node node) {
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117 int rank = 0;
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118 Edge e;
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119 for (int i1 = 0; i1 < node.incoming.size(); i1++) {
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120 e = node.incoming.getEdge(i1);
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121 rank = Math.max(rank, e.delta + e.source.rank);
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122 }
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123 node.rank = rank;
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124 }
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125
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126 }