Import GraphML files correctly (Issue #149)

- Default edge type needs to be 'MIXED', as default edge type is a misnomer

modules/ImportPlugin/src/main/java/org/gephi/io/importer/plugin/file/ImporterGraphML.java

@@ -96,6 +96,7 @@ public class ImporterGraphML implements FileImporter, LongTask {
     //Architecture
     private Reader reader;
     private ContainerLoader container;
+    private EdgeDraft.EdgeType edgeDefault;
     private boolean cancel;
     private Report report;
     private ProgressTicket progress;
@@ -198,11 +199,18 @@ public class ImporterGraphML implements FileImporter, LongTask {
         }
 
         //Edge Type
+        // Container edge type should NOT be set to default edge type, as this is 
+        // not what it really means. Mixed is the appropriate type, as GraphML supports
+        // mixed edge types. 
+        
+        container.setEdgeDefault(EdgeDefault.MIXED);
+        edgeDefault = EdgeDraft.EdgeType.DIRECTED;
+        
         if (!defaultEdgeType.isEmpty()) {
             if (defaultEdgeType.equalsIgnoreCase("undirected")) {
-                container.setEdgeDefault(EdgeDefault.UNDIRECTED);
+            	edgeDefault = EdgeDraft.EdgeType.UNDIRECTED;
             } else if (defaultEdgeType.equalsIgnoreCase("directed")) {
-                container.setEdgeDefault(EdgeDefault.DIRECTED);
+            	edgeDefault = EdgeDraft.EdgeType.DIRECTED;
             } else {
                 report.logIssue(new Issue(NbBundle.getMessage(ImporterGraphML.class, "importerGraphML_error_defaultedgetype", defaultEdgeType), Issue.Level.SEVERE));
             }
@@ -396,7 +404,10 @@ public class ImporterGraphML implements FileImporter, LongTask {
                 edge.setType(EdgeDraft.EdgeType.UNDIRECTED);
             } else {
                 report.logIssue(new Issue(NbBundle.getMessage(ImporterGraphML.class, "importerGraphML_error_edgetype", directed, edge), Issue.Level.SEVERE));
+                edge.setType(edgeDefault);
             }
+        } else {
+        	edge.setType(edgeDefault);
         }
 
         //Id