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19 package org.apache.maven.plugins.dependency.tree;
20
21 import java.io.IOException;
22 import java.io.UncheckedIOException;
23 import java.io.Writer;
24 import java.util.List;
25
26 import org.apache.maven.shared.dependency.graph.DependencyNode;
27 import org.apache.maven.shared.dependency.graph.traversal.DependencyNodeVisitor;
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36 public class DOTDependencyNodeVisitor extends AbstractSerializingVisitor implements DependencyNodeVisitor {
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43 public DOTDependencyNodeVisitor(Writer writer) {
44 super(writer);
45 }
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49
50 @Override
51 public boolean visit(DependencyNode node) {
52 try {
53 if (node.getParent() == null || node.getParent() == node) {
54 writer.write("digraph \"" + node.toNodeString() + "\" { " + System.lineSeparator());
55 writer.flush();
56 }
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60 List<DependencyNode> children = node.getChildren();
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62 for (DependencyNode child : children) {
63 writer.write("\t\"" + node.toNodeString() + "\" -> \"" + child.toNodeString() + "\" ; "
64 + System.lineSeparator());
65 }
66 writer.flush();
67 } catch (IOException e) {
68 throw new UncheckedIOException("Failed to write DOT format output", e);
69 }
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71 return true;
72 }
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77 @Override
78 public boolean endVisit(DependencyNode node) {
79 try {
80 if (node.getParent() == null || node.getParent() == node) {
81 writer.write(" } " + System.lineSeparator());
82 writer.flush();
83 }
84 } catch (IOException e) {
85 throw new UncheckedIOException("Failed to write DOT format output", e);
86 }
87 return true;
88 }
89 }