Fix #1516 Edge labels not retained on graphml export

modules/ExportPlugin/src/main/java/org/gephi/io/exporter/plugin/ExporterGraphML.java

@@ -444,10 +444,19 @@ public class ExporterGraphML implements GraphExporter, CharacterExporter, LongTa
         Element weightE = createEdgeWeight(document, e, graph);
         edgeE.appendChild(weightE);
 
-        if (e.isDirected() && !graph.isDirected()) {
-            edgeE.setAttribute("type", "directed");
-        } else if (!e.isDirected() && graph.isDirected()) {
-            edgeE.setAttribute("type", "undirected");
+        boolean directedEdgeDefault = graph.isDirected() || graph.isMixed();
+        if (e.isDirected() && !directedEdgeDefault) {
+            edgeE.setAttribute("directed", "true");
+        } else if (!e.isDirected() && directedEdgeDefault) {
+            edgeE.setAttribute("directed", "false");
+        }
+
+        if (e.getTypeLabel() != null) {
+            //Edge labels not retained on graphml export https://github.com/gephi/gephi/issues/1516
+            String typeLabel = e.getTypeLabel().toString().trim();
+            if (!typeLabel.isEmpty()) {
+                edgeE.setAttribute("label", typeLabel);
+            }
         }
 
         //Attribute values

modules/ExportPlugin/src/main/nbm/manifest.mf

 Manifest-Version: 1.0
 AutoUpdate-Essential-Module: true
 OpenIDE-Module-Localizing-Bundle: org/gephi/io/exporter/plugin/Bundle.properties
-OpenIDE-Module-Specification-Version: ${gephi.modules.specification.version}
+OpenIDE-Module-Specification-Version: 0.9.2.1
 OpenIDE-Module-Display-Category: Plugin
 OpenIDE-Module-Name: Export Plugin

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

@@ -85,6 +85,7 @@ public class ImporterGraphML implements FileImporter, LongTask {
     private static final String EDGE_SOURCE = "source";
     private static final String EDGE_TARGET = "target";
     private static final String EDGE_DIRECTED = "directed";
+    private static final String EDGE_TYPE = "label";
     private static final String ATTRIBUTE = "key";
     private static final String ATTRIBUTE_ID = "id";
     private static final String ATTRIBUTE_TITLE = "attr.name";
@@ -371,6 +372,7 @@ public class ImporterGraphML implements FileImporter, LongTask {
         String source = "";
         String target = "";
         String directed = "";
+        String type = null;
 
         //Attributes
         for (int i = 0; i < reader.getAttributeCount(); i++) {
@@ -383,6 +385,8 @@ public class ImporterGraphML implements FileImporter, LongTask {
                 id = reader.getAttributeValue(i);
             } else if (EDGE_DIRECTED.equalsIgnoreCase(attName)) {
                 directed = reader.getAttributeValue(i);
+            } else if (EDGE_TYPE.equalsIgnoreCase(attName)) {
+                type = reader.getAttributeValue(i).trim();
             }
         }
 
@@ -398,6 +402,10 @@ public class ImporterGraphML implements FileImporter, LongTask {
         NodeDraft nodeTarget = container.getNode(target);
         edge.setSource(nodeSource);
         edge.setTarget(nodeTarget);
+        if (type != null && !type.isEmpty()) {
+            //Edge labels not retained on graphml export https://github.com/gephi/gephi/issues/1516
+            edge.setType(type);
+        }
 
         //Type
         if (!directed.isEmpty()) {
@@ -415,9 +423,9 @@ public class ImporterGraphML implements FileImporter, LongTask {
 
         boolean end = false;
         while (reader.hasNext() && !end) {
-            int type = reader.next();
+            int elemType = reader.next();
 
-            switch (type) {
+            switch (elemType) {
                 case XMLStreamReader.START_ELEMENT:
                     if (ATTVALUE.equalsIgnoreCase(xmlReader.getLocalName())) {
                         readEdgeAttValue(reader, edge);