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langtools/src/jdk.jdeps/share/classes/com/sun/tools/jdeps/ModuleDotGraph.java

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  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package com.sun.tools.jdeps;
  26 
  27 import static java.lang.module.ModuleDescriptor.Requires.Modifier.*;
  28 import static java.util.stream.Collectors.*;
  29 
  30 import java.io.BufferedWriter;
  31 import java.io.IOException;
  32 import java.io.PrintWriter;
  33 import java.lang.module.Configuration;
  34 import java.lang.module.ModuleDescriptor;

  35 import java.lang.module.ModuleFinder;
  36 import java.lang.module.ModuleReference;
  37 import java.lang.module.ResolvedModule;
  38 import java.nio.file.Files;
  39 import java.nio.file.Path;
  40 import java.util.ArrayDeque;
  41 import java.util.ArrayList;

  42 import java.util.Deque;
  43 import java.util.HashMap;
  44 import java.util.HashSet;
  45 import java.util.List;
  46 import java.util.Map;
  47 import java.util.Objects;
  48 import java.util.Set;
  49 import java.util.TreeSet;
  50 import java.util.function.Function;
  51 import java.util.stream.Collectors;
  52 import java.util.stream.Stream;
  53 
  54 /**
  55  * Generate dot graph for modules
  56  */
  57 public class ModuleDotGraph {
  58     private final Map<String, Configuration> configurations;
  59     private final boolean apiOnly;
  60     public ModuleDotGraph(JdepsConfiguration config, boolean apiOnly) {
  61         this(config.rootModules().stream()
  62                    .map(Module::name)
  63                    .sorted()
  64                    .collect(toMap(Function.identity(), mn -> config.resolve(Set.of(mn)))),
  65              apiOnly);
  66     }
  67 
  68     public ModuleDotGraph(Map<String, Configuration> configurations, boolean apiOnly) {
  69         this.configurations = configurations;
  70         this.apiOnly = apiOnly;
  71     }
  72 
  73     /**
  74      * Generate dotfile for all modules
  75      *
  76      * @param dir output directory
  77      */
  78     public boolean genDotFiles(Path dir) throws IOException {






  79         Files.createDirectories(dir);
  80         for (String mn : configurations.keySet()) {
  81             Path path = dir.resolve(mn + ".dot");
  82             genDotFile(path, mn, configurations.get(mn));
  83         }
  84         return true;
  85     }
  86 
  87     /**
  88      * Generate dotfile of the given path
  89      */
  90     public void genDotFile(Path path, String name, Configuration configuration)


  91         throws IOException
  92     {
  93         // transitive reduction
  94         Graph<String> graph = apiOnly
  95                 ? requiresTransitiveGraph(configuration, Set.of(name))
  96                 : gengraph(configuration);
  97 
  98         DotGraphBuilder builder = new DotGraphBuilder(name, graph);
  99         builder.subgraph("se", "java", DotGraphBuilder.ORANGE,
 100                          DotGraphBuilder.JAVA_SE_SUBGRAPH)
 101                .subgraph("jdk", "jdk", DotGraphBuilder.BLUE,
 102                          DotGraphBuilder.JDK_SUBGRAPH)
 103                .descriptors(graph.nodes().stream()
 104                                  .map(mn -> configuration.findModule(mn).get()
 105                                                 .reference().descriptor()));
 106         // build dot file
 107         builder.build(path);
 108     }
 109 
 110     /**
 111      * Returns a Graph of the given Configuration after transitive reduction.
 112      *
 113      * Transitive reduction of requires transitive edge and requires edge have
 114      * to be applied separately to prevent the requires transitive edges
 115      * (e.g. U -> V) from being reduced by a path (U -> X -> Y -> V)
 116      * in which  V would not be re-exported from U.
 117      */
 118     private Graph<String> gengraph(Configuration cf) {
 119         Graph.Builder<String> builder = new Graph.Builder<>();
 120         cf.modules().stream()
 121             .forEach(resolvedModule -> {
 122                 String mn = resolvedModule.reference().descriptor().name();
 123                 builder.addNode(mn);
 124                 resolvedModule.reads().stream()
 125                     .map(ResolvedModule::name)
 126                     .forEach(target -> builder.addEdge(mn, target));
 127             });
 128 
 129         Graph<String> rpg = requiresTransitiveGraph(cf, builder.nodes);
 130         return builder.build().reduce(rpg);
 131     }
 132 
 133 
 134     /**
 135      * Returns a Graph containing only requires transitive edges
 136      * with transitive reduction.
 137      */
 138     public Graph<String> requiresTransitiveGraph(Configuration cf,
 139                                                  Set<String> roots)
 140     {
 141         Deque<String> deque = new ArrayDeque<>(roots);
 142         Set<String> visited = new HashSet<>();
 143         Graph.Builder<String> builder = new Graph.Builder<>();
 144 
 145         while (deque.peek() != null) {
 146             String mn = deque.pop();
 147             if (visited.contains(mn))
 148                 continue;
 149 
 150             visited.add(mn);
 151             builder.addNode(mn);
 152             ModuleDescriptor descriptor = cf.findModule(mn).get()
 153                 .reference().descriptor();
 154             descriptor.requires().stream()
 155                 .filter(d -> d.modifiers().contains(TRANSITIVE)
 156                                 || d.name().equals("java.base"))
 157                 .map(d -> d.name())
 158                 .forEach(d -> {
 159                     deque.add(d);
 160                     builder.addEdge(mn, d);
 161                 });
 162         }
 163 
 164         return builder.build().reduce();
 165     }
 166 
 167     public static class DotGraphBuilder {


















































































 168         static final Set<String> JAVA_SE_SUBGRAPH = javaSE();
 169         static final Set<String> JDK_SUBGRAPH = jdk();
 170 
 171         private static Set<String> javaSE() {
 172             String root = "java.se.ee";
 173             ModuleFinder system = ModuleFinder.ofSystem();
 174             if (system.find(root).isPresent()) {
 175                 return Stream.concat(Stream.of(root),
 176                                      Configuration.empty().resolve(system,
 177                                                                    ModuleFinder.of(),
 178                                                                    Set.of(root))
 179                                                   .findModule(root).get()
 180                                                   .reads().stream()
 181                                                   .map(ResolvedModule::name))
 182                              .collect(toSet());
 183             } else {
 184                 // approximation
 185                 return system.findAll().stream()
 186                     .map(ModuleReference::descriptor)
 187                     .map(ModuleDescriptor::name)


 198                     .filter(name -> !JAVA_SE_SUBGRAPH.contains(name) &&
 199                                         (name.startsWith("java.") ||
 200                                             name.startsWith("jdk.") ||
 201                                             name.startsWith("javafx.")))
 202                     .collect(Collectors.toSet());
 203         }
 204 
 205         static class SubGraph {
 206             final String name;
 207             final String group;
 208             final String color;
 209             final Set<String> nodes;
 210             SubGraph(String name, String group, String color, Set<String> nodes) {
 211                 this.name = Objects.requireNonNull(name);
 212                 this.group = Objects.requireNonNull(group);
 213                 this.color = Objects.requireNonNull(color);
 214                 this.nodes = Objects.requireNonNull(nodes);
 215             }
 216         }
 217 
 218         static final String ORANGE = "#e76f00";
 219         static final String BLUE = "#437291";
 220         static final String GRAY = "#dddddd";
 221         static final String BLACK = "#000000";
 222 
 223         static final String FONT_NAME = "DejaVuSans";
 224         static final int FONT_SIZE = 12;
 225         static final int ARROW_SIZE = 1;
 226         static final int ARROW_WIDTH = 2;
 227         static final int RANK_SEP = 1;
 228 
 229         static final String REEXPORTS = "";
 230         static final String REQUIRES = "style=\"dashed\"";
 231         static final String REQUIRES_BASE = "color=\"" + GRAY + "\"";
 232 
 233         // can be configured
 234         static double rankSep   = RANK_SEP;
 235         static String fontColor = BLACK;
 236         static String fontName  = FONT_NAME;
 237         static int fontsize     = FONT_SIZE;
 238         static int arrowWidth   = ARROW_WIDTH;
 239         static int arrowSize    = ARROW_SIZE;
 240         static final Map<String, Integer> weights = new HashMap<>();
 241         static final List<Set<String>> ranks = new ArrayList<>();
 242 
 243         private final String name;
 244         private final Graph<String> graph;
 245         private final Set<ModuleDescriptor> descriptors = new TreeSet<>();
 246         private final List<SubGraph> subgraphs = new ArrayList<>();
 247         public DotGraphBuilder(String name, Graph<String> graph) {



 248             this.name = name;
 249             this.graph = graph;

 250         }
 251 
 252         public DotGraphBuilder descriptors(Stream<ModuleDescriptor> descriptors) {
 253             descriptors.forEach(this.descriptors::add);
 254             return this;
 255         }
 256 
 257         public void build(Path filename) throws IOException {
 258             try (BufferedWriter writer = Files.newBufferedWriter(filename);
 259                  PrintWriter out = new PrintWriter(writer)) {
 260 
 261                 out.format("digraph \"%s\" {%n", name);
 262                 out.format("  nodesep=.5;%n");
 263                 out.format("  ranksep=%f;%n", rankSep);
 264                 out.format("  pencolor=transparent;%n");
 265                 out.format("  node [shape=plaintext, fontname=\"%s\", fontsize=%d, margin=\".2,.2\"];%n",
 266                            fontName, fontsize);
 267                 out.format("  edge [penwidth=%d, color=\"#999999\", arrowhead=open, arrowsize=%d];%n",
 268                            arrowWidth, arrowSize);





 269 
 270                 // same RANKS
 271                 ranks.stream()
 272                      .map(nodes -> descriptors.stream()
 273                                         .map(ModuleDescriptor::name)
 274                                         .filter(nodes::contains)
 275                                         .map(mn -> "\"" + mn + "\"")
 276                                         .collect(joining(",")))
 277                      .filter(group -> group.length() > 0)
 278                      .forEach(group -> out.format("  {rank=same %s}%n", group));
 279 
 280                 subgraphs.forEach(subgraph -> {
 281                     out.format("  subgraph %s {%n", subgraph.name);
 282                     descriptors.stream()
 283                         .map(ModuleDescriptor::name)
 284                         .filter(subgraph.nodes::contains)
 285                         .forEach(mn -> printNode(out, mn, subgraph.color, subgraph.group));
 286                     out.format("  }%n");
 287                 });
 288 
 289                 descriptors.stream()
 290                     .filter(md -> graph.contains(md.name()) &&
 291                                     !graph.adjacentNodes(md.name()).isEmpty())


 297 
 298         public DotGraphBuilder subgraph(String name, String group, String color,
 299                                  Set<String> nodes) {
 300             subgraphs.add(new SubGraph(name, group, color, nodes));
 301             return this;
 302         }
 303 
 304         public void printNode(PrintWriter out, String node, String color, String group) {
 305             out.format("  \"%s\" [fontcolor=\"%s\", group=%s];%n",
 306                        node, color, group);
 307         }
 308 
 309         public void printNode(PrintWriter out, ModuleDescriptor md, Set<String> edges) {
 310             Set<String> requiresTransitive = md.requires().stream()
 311                 .filter(d -> d.modifiers().contains(TRANSITIVE))
 312                 .map(d -> d.name())
 313                 .collect(toSet());
 314 
 315             String mn = md.name();
 316             edges.stream().forEach(dn -> {
 317                 String attr = dn.equals("java.base") ? REQUIRES_BASE
 318                     : (requiresTransitive.contains(dn) ? REEXPORTS : REQUIRES);




 319 
 320                 int w = weightOf(mn, dn);
 321                 if (w > 1) {
 322                     if (!attr.isEmpty())
 323                         attr += ", ";
 324 
 325                     attr += "weight=" + w;
 326                 }
 327                 out.format("  \"%s\" -> \"%s\" [%s];%n", mn, dn, attr);
 328             });
 329         }
 330 
 331         public int weightOf(String s, String t) {
 332             int w = weights.getOrDefault(s + ":" + t, 1);
 333             if (w != 1)
 334                 return w;
 335             if (s.startsWith("java.") && t.startsWith("java."))
 336                 return 10;
 337             return 1;
 338         }
 339 
 340         public static void sameRankNodes(Set<String> nodes) {
 341             ranks.add(nodes);
 342         }
 343 
 344         public static void weight(String s, String t, int w) {
 345             weights.put(s + ":" + t, w);
 346         }
 347 
 348         public static void setRankSep(double value) {
 349             rankSep = value;
 350         }
 351 
 352         public static void setFontSize(int size) {
 353             fontsize = size;
 354         }
 355 
 356         public static void setFontColor(String color) {
 357             fontColor = color;
 358         }
 359 
 360         public static void setArrowSize(int size) {
 361             arrowSize = size;
 362         }
 363 
 364         public static void setArrowWidth(int width) {
 365             arrowWidth = width;
 366         }
 367     }
 368 }


  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package com.sun.tools.jdeps;
  26 
  27 import static java.lang.module.ModuleDescriptor.Requires.Modifier.*;
  28 import static java.util.stream.Collectors.*;
  29 
  30 import java.io.BufferedWriter;
  31 import java.io.IOException;
  32 import java.io.PrintWriter;
  33 import java.lang.module.Configuration;
  34 import java.lang.module.ModuleDescriptor;
  35 import java.lang.module.ModuleDescriptor.*;
  36 import java.lang.module.ModuleFinder;
  37 import java.lang.module.ModuleReference;
  38 import java.lang.module.ResolvedModule;
  39 import java.nio.file.Files;
  40 import java.nio.file.Path;
  41 import java.util.ArrayDeque;
  42 import java.util.ArrayList;
  43 import java.util.Collections;
  44 import java.util.Deque;

  45 import java.util.HashSet;
  46 import java.util.List;
  47 import java.util.Map;
  48 import java.util.Objects;
  49 import java.util.Set;
  50 import java.util.TreeSet;
  51 import java.util.function.Function;
  52 import java.util.stream.Collectors;
  53 import java.util.stream.Stream;
  54 
  55 /**
  56  * Generate dot graph for modules
  57  */
  58 public class ModuleDotGraph {
  59     private final Map<String, Configuration> configurations;
  60     private final boolean apiOnly;
  61     public ModuleDotGraph(JdepsConfiguration config, boolean apiOnly) {
  62         this(config.rootModules().stream()
  63                    .map(Module::name)
  64                    .sorted()
  65                    .collect(toMap(Function.identity(), mn -> config.resolve(Set.of(mn)))),
  66              apiOnly);
  67     }
  68 
  69     public ModuleDotGraph(Map<String, Configuration> configurations, boolean apiOnly) {
  70         this.configurations = configurations;
  71         this.apiOnly = apiOnly;
  72     }
  73 
  74     /**
  75      * Generate dotfile for all modules
  76      *
  77      * @param dir output directory
  78      */
  79     public boolean genDotFiles(Path dir) throws IOException {
  80         return genDotFiles(dir, DotGraphAttributes.DEFAULT);
  81     }
  82 
  83     public boolean genDotFiles(Path dir, Attributes attributes)
  84         throws IOException
  85     {
  86         Files.createDirectories(dir);
  87         for (String mn : configurations.keySet()) {
  88             Path path = dir.resolve(mn + ".dot");
  89             genDotFile(path, mn, configurations.get(mn), attributes);
  90         }
  91         return true;
  92     }
  93 
  94     /**
  95      * Generate dotfile of the given path
  96      */
  97     public void genDotFile(Path path, String name,
  98                            Configuration configuration,
  99                            Attributes attributes)
 100         throws IOException
 101     {
 102         // transitive reduction
 103         Graph<String> graph = apiOnly
 104                 ? requiresTransitiveGraph(configuration, Set.of(name))
 105                 : gengraph(configuration);
 106 
 107         DotGraphBuilder builder = new DotGraphBuilder(name, graph, attributes);
 108         builder.subgraph("se", "java", attributes.javaSubgraphColor(),
 109                          DotGraphBuilder.JAVA_SE_SUBGRAPH)
 110                .subgraph("jdk", "jdk", attributes.jdkSubgraphColor(),
 111                          DotGraphBuilder.JDK_SUBGRAPH)
 112                .modules(graph.nodes().stream()
 113                                  .map(mn -> configuration.findModule(mn).get()
 114                                                 .reference().descriptor()));
 115         // build dot file
 116         builder.build(path);
 117     }
 118 
 119     /**
 120      * Returns a Graph of the given Configuration after transitive reduction.
 121      *
 122      * Transitive reduction of requires transitive edge and requires edge have
 123      * to be applied separately to prevent the requires transitive edges
 124      * (e.g. U -> V) from being reduced by a path (U -> X -> Y -> V)
 125      * in which  V would not be re-exported from U.
 126      */
 127     private Graph<String> gengraph(Configuration cf) {
 128         Graph.Builder<String> builder = new Graph.Builder<>();
 129         cf.modules().stream()
 130             .forEach(rm -> {
 131                 String mn = rm.name();
 132                 builder.addNode(mn);
 133                 rm.reads().stream()
 134                   .map(ResolvedModule::name)
 135                   .forEach(target -> builder.addEdge(mn, target));
 136             });
 137 
 138         Graph<String> rpg = requiresTransitiveGraph(cf, builder.nodes);
 139         return builder.build().reduce(rpg);
 140     }
 141 
 142 
 143     /**
 144      * Returns a Graph containing only requires transitive edges
 145      * with transitive reduction.
 146      */
 147     public Graph<String> requiresTransitiveGraph(Configuration cf,
 148                                                  Set<String> roots)
 149     {
 150         Deque<String> deque = new ArrayDeque<>(roots);
 151         Set<String> visited = new HashSet<>();
 152         Graph.Builder<String> builder = new Graph.Builder<>();
 153 
 154         while (deque.peek() != null) {
 155             String mn = deque.pop();
 156             if (visited.contains(mn))
 157                 continue;
 158 
 159             visited.add(mn);
 160             builder.addNode(mn);
 161             cf.findModule(mn).get()
 162               .reference().descriptor().requires().stream()

 163               .filter(d -> d.modifiers().contains(TRANSITIVE)
 164                                 || d.name().equals("java.base"))
 165               .map(Requires::name)
 166               .forEach(d -> {
 167                   deque.add(d);
 168                   builder.addEdge(mn, d);
 169               });
 170         }
 171 
 172         return builder.build().reduce();
 173     }
 174 
 175     public interface Attributes {
 176         static final String ORANGE = "#e76f00";
 177         static final String BLUE = "#437291";
 178         static final String BLACK = "#000000";
 179         static final String DARK_GRAY = "#999999";
 180         static final String LIGHT_GRAY = "#dddddd";
 181 
 182         int fontSize();
 183         String fontName();
 184         String fontColor();
 185 
 186         int arrowSize();
 187         int arrowWidth();
 188         String arrowColor();
 189 
 190         default double rankSep() {
 191             return 1;
 192         }
 193 
 194         default List<Set<String>> ranks() {
 195             return Collections.emptyList();
 196         }
 197 
 198         default int weightOf(String s, String t) {
 199             return 1;
 200         }
 201 
 202         default String requiresMandatedColor() {
 203             return LIGHT_GRAY;
 204         }
 205 
 206         default String javaSubgraphColor() {
 207             return ORANGE;
 208         }
 209 
 210         default String jdkSubgraphColor() {
 211             return BLUE;
 212         }
 213     }
 214 
 215     static class DotGraphAttributes implements Attributes {
 216         static final DotGraphAttributes DEFAULT = new DotGraphAttributes();
 217 
 218         static final String FONT_NAME = "DejaVuSans";
 219         static final int FONT_SIZE = 12;
 220         static final int ARROW_SIZE = 1;
 221         static final int ARROW_WIDTH = 2;
 222 
 223         @Override
 224         public int fontSize() {
 225             return FONT_SIZE;
 226         }
 227 
 228         @Override
 229         public String fontName() {
 230             return FONT_NAME;
 231         }
 232 
 233         @Override
 234         public String fontColor() {
 235             return BLACK;
 236         }
 237 
 238         @Override
 239         public int arrowSize() {
 240             return ARROW_SIZE;
 241         }
 242 
 243         @Override
 244         public int arrowWidth() {
 245             return ARROW_WIDTH;
 246         }
 247 
 248         @Override
 249         public String arrowColor() {
 250             return DARK_GRAY;
 251         }
 252     }
 253 
 254     private static class DotGraphBuilder {
 255         static final String REEXPORTS = "";
 256         static final String REQUIRES = "style=\"dashed\"";
 257 
 258         static final Set<String> JAVA_SE_SUBGRAPH = javaSE();
 259         static final Set<String> JDK_SUBGRAPH = jdk();
 260 
 261         private static Set<String> javaSE() {
 262             String root = "java.se.ee";
 263             ModuleFinder system = ModuleFinder.ofSystem();
 264             if (system.find(root).isPresent()) {
 265                 return Stream.concat(Stream.of(root),
 266                                      Configuration.empty().resolve(system,
 267                                                                    ModuleFinder.of(),
 268                                                                    Set.of(root))
 269                                                   .findModule(root).get()
 270                                                   .reads().stream()
 271                                                   .map(ResolvedModule::name))
 272                              .collect(toSet());
 273             } else {
 274                 // approximation
 275                 return system.findAll().stream()
 276                     .map(ModuleReference::descriptor)
 277                     .map(ModuleDescriptor::name)


 288                     .filter(name -> !JAVA_SE_SUBGRAPH.contains(name) &&
 289                                         (name.startsWith("java.") ||
 290                                             name.startsWith("jdk.") ||
 291                                             name.startsWith("javafx.")))
 292                     .collect(Collectors.toSet());
 293         }
 294 
 295         static class SubGraph {
 296             final String name;
 297             final String group;
 298             final String color;
 299             final Set<String> nodes;
 300             SubGraph(String name, String group, String color, Set<String> nodes) {
 301                 this.name = Objects.requireNonNull(name);
 302                 this.group = Objects.requireNonNull(group);
 303                 this.color = Objects.requireNonNull(color);
 304                 this.nodes = Objects.requireNonNull(nodes);
 305             }
 306         }
 307 

























 308         private final String name;
 309         private final Graph<String> graph;
 310         private final Set<ModuleDescriptor> descriptors = new TreeSet<>();
 311         private final List<SubGraph> subgraphs = new ArrayList<>();
 312         private final Attributes attributes;
 313         public DotGraphBuilder(String name,
 314                                Graph<String> graph,
 315                                Attributes attributes) {
 316             this.name = name;
 317             this.graph = graph;
 318             this.attributes = attributes;
 319         }
 320 
 321         public DotGraphBuilder modules(Stream<ModuleDescriptor> descriptors) {
 322             descriptors.forEach(this.descriptors::add);
 323             return this;
 324         }
 325 
 326         public void build(Path filename) throws IOException {
 327             try (BufferedWriter writer = Files.newBufferedWriter(filename);
 328                  PrintWriter out = new PrintWriter(writer)) {
 329 
 330                 out.format("digraph \"%s\" {%n", name);
 331                 out.format("  nodesep=.5;%n");
 332                 out.format("  ranksep=%f;%n", attributes.rankSep());
 333                 out.format("  pencolor=transparent;%n");
 334                 out.format("  node [shape=plaintext, fontcolor=\"%s\", fontname=\"%s\","
 335                                 + " fontsize=%d, margin=\".2,.2\"];%n",
 336                            attributes.fontColor(),
 337                            attributes.fontName(),
 338                            attributes.fontSize());
 339                 out.format("  edge [penwidth=%d, color=\"%s\", arrowhead=open, arrowsize=%d];%n",
 340                            attributes.arrowWidth(),
 341                            attributes.arrowColor(),
 342                            attributes.arrowSize());
 343 
 344                 // same RANKS
 345                 attributes.ranks().stream()
 346                     .map(nodes -> descriptors.stream()
 347                                         .map(ModuleDescriptor::name)
 348                                         .filter(nodes::contains)
 349                                         .map(mn -> "\"" + mn + "\"")
 350                                         .collect(joining(",")))
 351                     .filter(group -> group.length() > 0)
 352                     .forEach(group -> out.format("  {rank=same %s}%n", group));
 353 
 354                 subgraphs.forEach(subgraph -> {
 355                     out.format("  subgraph %s {%n", subgraph.name);
 356                     descriptors.stream()
 357                         .map(ModuleDescriptor::name)
 358                         .filter(subgraph.nodes::contains)
 359                         .forEach(mn -> printNode(out, mn, subgraph.color, subgraph.group));
 360                     out.format("  }%n");
 361                 });
 362 
 363                 descriptors.stream()
 364                     .filter(md -> graph.contains(md.name()) &&
 365                                     !graph.adjacentNodes(md.name()).isEmpty())


 371 
 372         public DotGraphBuilder subgraph(String name, String group, String color,
 373                                  Set<String> nodes) {
 374             subgraphs.add(new SubGraph(name, group, color, nodes));
 375             return this;
 376         }
 377 
 378         public void printNode(PrintWriter out, String node, String color, String group) {
 379             out.format("  \"%s\" [fontcolor=\"%s\", group=%s];%n",
 380                        node, color, group);
 381         }
 382 
 383         public void printNode(PrintWriter out, ModuleDescriptor md, Set<String> edges) {
 384             Set<String> requiresTransitive = md.requires().stream()
 385                 .filter(d -> d.modifiers().contains(TRANSITIVE))
 386                 .map(d -> d.name())
 387                 .collect(toSet());
 388 
 389             String mn = md.name();
 390             edges.stream().forEach(dn -> {
 391                 String attr;
 392                 if (dn.equals("java.base")) {
 393                     attr = "color=\"" + attributes.requiresMandatedColor() + "\"";
 394                 } else {
 395                     attr = (requiresTransitive.contains(dn) ? REEXPORTS : REQUIRES);
 396                 }
 397 
 398                 int w = attributes.weightOf(mn, dn);
 399                 if (w > 1) {
 400                     if (!attr.isEmpty())
 401                         attr += ", ";
 402 
 403                     attr += "weight=" + w;
 404                 }
 405                 out.format("  \"%s\" -> \"%s\" [%s];%n", mn, dn, attr);
 406             });
 407         }
 408 




































 409     }
 410 }
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