[#1350] Escape chars in DotFileFormatSimple

gradoop-flink/src/main/java/org/gradoop/flink/io/impl/dot/functions/AbstractDotFileFormat.java

@@ -127,7 +127,7 @@ private void writeEdges(GraphTransaction transaction, StringBuilder builder, Str
         .append(edge.getTargetId())
         .append(suffix)
         .append(" [");
-      // write dot attributes if existent
+      // write dot attributes if present
       writeLabel(builder, edge);
       builder.append("];\n");
     }

gradoop-flink/src/main/java/org/gradoop/flink/io/impl/dot/functions/DotFileFormatSimple.java

@@ -22,6 +22,8 @@
 import org.gradoop.common.model.impl.properties.Property;
 import org.gradoop.flink.model.impl.layouts.transactional.tuples.GraphTransaction;
 
+import static org.apache.commons.lang3.StringEscapeUtils.escapeJava;
+
 /**
  * Converts a GraphTransaction to the following .dot format:
  * <p>{@code
@@ -79,17 +81,17 @@ void writeLabel(StringBuilder builder, Element element) {
     Properties properties = element.getProperties();
 
     if (properties != null && properties.size() > 0) {
-      builder.append("label=\"").append(label).append("\"");
+      builder.append("label=\"").append(escapeJava(label)).append("\"");
 
       for (Property property: properties) {
         builder.append(",")
-          .append(property.getKey())
+          .append(escapeJava(property.getKey()))
           .append("=\"")
-          .append(property.getValue().toString())
+          .append(escapeJava(property.getValue().toString()))
           .append("\"");
       }
     } else {
-      builder.append("label=\"").append(label).append("\"");
+      builder.append("label=\"").append(escapeJava(label)).append("\"");
     }
   }
 }

gradoop-flink/src/test/java/org/gradoop/flink/io/impl/dot/DOTDataSinkTest.java

@@ -128,7 +128,7 @@ private void checkWriteOutput(List<String> lines, DOTDataSink.DotFormat format)
         countSubgraphLines++;
       }
 
-      if (format == DOTDataSink.DotFormat.HTML) {
+      if (format.equals(DOTDataSink.DotFormat.HTML)) {
         int index = line.indexOf('&');
         if (index != -1) {
           assertTrue("HTML entity & should have been escaped", line.substring(index).startsWith("&amp;"));

gradoop-flink/src/test/java/org/gradoop/flink/io/impl/dot/functions/DotFileFormatSimpleTest.java

@@ -54,18 +54,21 @@ public void initGraphTransactionMock() {
     propertiesMap1.put("name", "Tom");
     propertiesMap1.put("age", 25);
     GradoopId idVertex1 = GradoopId.fromString("bbbbbbbbbbbbbbbbbbbbbbbb");
-    EPGMVertex vertex1 = new EPGMVertexFactory().initVertex(idVertex1, "Person", Properties.createFromMap(propertiesMap1));
+    EPGMVertex vertex1 = new EPGMVertexFactory().initVertex(
+            idVertex1, "Person", Properties.createFromMap(propertiesMap1));
     // init vertex 2
     Map<String, Object> propertiesMap2 = new HashMap<>();
     propertiesMap2.put("lan", "EN");
     GradoopId idVertex2 = GradoopId.fromString("cccccccccccccccccccccccc");
-    EPGMVertex vertex2 = new EPGMVertexFactory().initVertex(idVertex2, "Forum", Properties.createFromMap(propertiesMap2));
+    EPGMVertex vertex2 = new EPGMVertexFactory().initVertex(
+            idVertex2, "Forum", Properties.createFromMap(propertiesMap2));
     // init vertex 3
     Map<String, Object> propertiesMap3 = new HashMap<>();
     propertiesMap3.put("name", "Anna");
     propertiesMap3.put("age", 27);
     GradoopId idVertex3 = GradoopId.fromString("dddddddddddddddddddddddd");
-    EPGMVertex vertex3 = new EPGMVertexFactory().initVertex(idVertex3, "Person", Properties.createFromMap(propertiesMap3));
+    EPGMVertex vertex3 = new EPGMVertexFactory().initVertex(
+            idVertex3, "Person", Properties.createFromMap(propertiesMap3));
     // create vertex set
     Set<EPGMVertex> vertices = new HashSet<>();
     vertices.add(vertex1);
@@ -103,11 +106,54 @@ public void testFormat() {
       "vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa [label=\"Person\",name=\"Anna\",age=\"27\"];\n" +
       "vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa [label=\"Person\",name=\"Tom\",age=\"25\"];\n" +
       "vccccccccccccccccccccccccaaaaaaaaaaaaaaaaaaaaaaaa [label=\"Forum\",lan=\"EN\"];\n" +
-      "vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa->vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa [label=\"knows\"];\n" +
-      "vccccccccccccccccccccccccaaaaaaaaaaaaaaaaaaaaaaaa->vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa [label=\"hasModerator\"];\n" +
-      "vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa->vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa [label=\"knows\"];\n" +
+      "vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa->" +
+            "vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa [label=\"knows\"];\n" +
+      "vccccccccccccccccccccccccaaaaaaaaaaaaaaaaaaaaaaaa->" +
+            "vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa [label=\"hasModerator\"];\n" +
+      "vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa->" +
+            "vddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaa [label=\"knows\"];\n" +
       "}\n";
 
     assertEquals(expected, dotFileFormat.format(transaction));
   }
+
+  /**
+   * Tests whether label and property value strings are being escaped according to java string rules.
+   */
+  @Test
+  public void testStringEscaping() {
+    EPGMGraphHead graphHead = new EPGMGraphHeadFactory()
+            .initGraphHead(GradoopId.fromString("aaaaaaaaaaaaaaaaaaaaaaaa"), "graph");
+
+    String key = "Title";
+    String value = "Why was Wojo occasionally known to say \"I'm too lazy!\"?";
+
+    // init vertex 1
+    Map<String, Object> propertiesMap1 = new HashMap<>();
+    propertiesMap1.put(key, value);
+    GradoopId idVertex1 = GradoopId.fromString("bbbbbbbbbbbbbbbbbbbbbbbb");
+    EPGMVertex vertex1 = new EPGMVertexFactory().initVertex(
+            idVertex1, "weird\nlabe\"l", Properties.createFromMap(propertiesMap1));
+
+    // create vertex set
+    Set<EPGMVertex> vertices = new HashSet<>();
+    vertices.add(vertex1);
+    // create empty edge set
+    Set<EPGMEdge> edges = new HashSet<>();
+
+    GraphTransaction transactionMock = mock(GraphTransaction.class);
+    when(transactionMock.getGraphHead()).thenReturn(graphHead);
+    when(transactionMock.getVertices()).thenReturn(vertices);
+    when(transactionMock.getEdges()).thenReturn(edges);
+
+    DotFileFormatSimple dotFileFormatSimple = new DotFileFormatSimple(true);
+
+    String expected = "subgraph cluster_gaaaaaaaaaaaaaaaaaaaaaaaa{\n" +
+            "label=\"graph\";\n" +
+            "vbbbbbbbbbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaa [label=\"weird\\nlabe\\\"l\"," +
+            "Title=\"Why was Wojo occasionally known to say \\\"I'm too lazy!\\\"?\"];\n" +
+            "}\n";
+
+    assertEquals(expected, dotFileFormatSimple.format(transactionMock));
+  }
 }