Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/graph/TightSpanningTreeSolver.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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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.TightSpanningTreeSolver; |
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14 |
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15 import java.lang.all; |
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16 import org.eclipse.draw2d.graph.SpanningTreeVisitor; |
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17 import org.eclipse.draw2d.graph.DirectedGraph; |
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18 import org.eclipse.draw2d.graph.Edge; |
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19 import org.eclipse.draw2d.graph.EdgeList; |
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20 import org.eclipse.draw2d.graph.Node; |
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21 import org.eclipse.draw2d.graph.NodeList; |
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22 |
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23 /** |
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24 * Finds a tight spanning tree from the graphs edges which induce a valid rank assignment. |
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25 * This process requires that the nodes be initially given a feasible ranking. |
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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 TightSpanningTreeSolver : SpanningTreeVisitor { |
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30 |
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31 protected DirectedGraph graph; |
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32 protected CandidateList candidates; |
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33 |
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34 static final class CandidateList { |
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35 private Edge[] edges; |
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36 private int size_; |
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37 |
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38 public this(){ |
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39 edges = new Edge[10]; |
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40 } |
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41 public void add(Edge edge) { |
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42 if (size_ is edges.length - 1) { |
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43 Edge newEdges[] = new Edge[edges.length * 2]; |
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44 System.arraycopy(edges, 0, newEdges, 0, edges.length); |
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45 edges = newEdges; |
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46 } |
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47 edges[size_++] = edge; |
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48 } |
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49 |
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50 public Edge getEdge(int index) { |
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51 return edges[index]; |
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52 } |
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53 |
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54 public void remove(Edge edge) { |
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55 for (int i = 0; i < size_; i++) { |
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56 if (edges[i] is edge) { |
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57 edges[i] = edges[size_ - 1]; |
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58 size_--; |
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59 return; |
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60 } |
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61 } |
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62 throw new RuntimeException("Remove called on invalid Edge"); //$NON-NLS-1$ |
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63 } |
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64 |
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65 public int size() { |
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66 return size_; |
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67 } |
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68 } |
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69 |
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70 protected NodeList members; |
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71 |
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72 public this(){ |
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73 candidates = new CandidateList(); |
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74 members = new NodeList(); |
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75 } |
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76 |
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77 public void visit(DirectedGraph graph) { |
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78 this.graph = graph; |
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79 init(); |
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80 solve(); |
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81 } |
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82 |
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83 Node addEdge(Edge edge) { |
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84 int delta = edge.getSlack(); |
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85 edge.tree = true; |
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86 Node node; |
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87 if (edge.target.flag) { |
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88 delta = -delta; |
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89 node = edge.source; |
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90 setParentEdge(node, edge); |
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91 getSpanningTreeChildren(edge.target).add(edge); |
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92 } else { |
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93 node = edge.target; |
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94 setParentEdge(node, edge); |
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95 getSpanningTreeChildren(edge.source).add(edge); |
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96 } |
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97 members.adjustRank(delta); |
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98 addNode(node); |
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99 return node; |
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100 } |
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101 |
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102 private bool isNodeReachable(Node node) { |
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103 return node.flag; |
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104 } |
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105 |
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106 private void setNodeReachable(Node node) { |
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107 node.flag = true; |
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108 } |
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109 |
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110 private bool isCandidate(Edge e) { |
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111 return e.flag; |
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112 } |
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113 |
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114 private void setCandidate(Edge e) { |
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115 e.flag = true; |
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116 } |
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117 |
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118 void addNode(Node node) { |
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119 setNodeReachable(node); |
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120 EdgeList list = node.incoming; |
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121 Edge e; |
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122 for (int i = 0; i < list.size(); i++) { |
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123 e = list.getEdge(i); |
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124 if (!isNodeReachable(e.source)) { |
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125 if (!isCandidate(e)) { |
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126 setCandidate(e); |
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127 candidates.add(e); |
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128 } |
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129 } else |
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130 candidates.remove(e); |
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131 } |
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132 |
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133 list = node.outgoing; |
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134 for (int i = 0; i < list.size(); i++) { |
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135 e = list.getEdge(i); |
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136 if (!isNodeReachable(e.target)) { |
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137 if (!isCandidate(e)) { |
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138 setCandidate(e); |
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139 candidates.add(e); |
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140 } |
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141 } else |
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142 candidates.remove(e); |
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143 } |
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144 members.add(node); |
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145 } |
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146 |
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147 void init() { |
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148 graph.edges.resetFlags(true); |
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149 graph.nodes.resetFlags(); |
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150 for (int i = 0; i < graph.nodes.size(); i++) { |
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151 Node node = cast(Node)graph.nodes.get(i); |
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152 node.workingData[0] = new EdgeList(); |
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153 } |
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154 } |
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155 |
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156 protected void solve() { |
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157 Node root = graph.nodes.getNode(0); |
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158 setParentEdge(root, null); |
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159 addNode(root); |
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160 while (members.size() < graph.nodes.size()) { |
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161 if (candidates.size() is 0) |
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162 throw new RuntimeException("graph is not fully connected");//$NON-NLS-1$ |
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163 int minSlack = Integer.MAX_VALUE, slack; |
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164 Edge minEdge = null, edge; |
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165 for (int i = 0; i < candidates.size() && minSlack > 0; i++) { |
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166 edge = candidates.getEdge(i); |
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167 slack = edge.getSlack(); |
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168 if (slack < minSlack) { |
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169 minSlack = slack; |
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170 minEdge = edge; |
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171 } |
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172 } |
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173 addEdge(minEdge); |
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174 } |
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175 graph.nodes.normalizeRanks(); |
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176 } |
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177 |
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178 } |