Use String instead

engine/src/main/java/com/arcadedb/graph/ImmutableEdge.java

@@ -133,10 +133,9 @@ protected boolean checkForLazyLoading() {
 
   @Override
   public synchronized String toString() {
-    final StringBuilder buffer = new StringBuilder();
-    buffer.append(out.toString());
-    buffer.append("<->");
-    buffer.append(in.toString());
-    return buffer.toString();
+      String buffer = out.toString() +
+              "<->" +
+              in.toString();
+    return buffer;
   }
 }

engine/src/main/java/com/arcadedb/graph/ImmutableLightEdge.java

@@ -117,10 +117,9 @@ public synchronized JSONObject toJSON() {
 
   @Override
   public synchronized String toString() {
-    final StringBuilder buffer = new StringBuilder();
-    buffer.append(out.toString());
-    buffer.append("<->");
-    buffer.append(in.toString());
-    return buffer.toString();
+      String buffer = out.toString() +
+              "<->" +
+              in.toString();
+    return buffer;
   }
 }

engine/src/test/java/com/arcadedb/query/sql/parser/MatchStatementTest.java

@@ -103,34 +103,31 @@ public void testLongPath2() {
 
   @Test
   public void testFilterTypes() {
-    StringBuilder query = new StringBuilder();
-    query.append("MATCH {");
-    query.append("   type: 'v', ");
-    query.append("   as: foo, ");
-    query.append("   where: (name = 'foo' and surname = 'bar' or aaa in [1,2,3]), ");
-    query.append("   maxDepth: 10 ");
-    query.append("} return foo");
-    checkRightSyntax(query.toString());
+      String query = "MATCH {" +
+              "   type: 'v', " +
+              "   as: foo, " +
+              "   where: (name = 'foo' and surname = 'bar' or aaa in [1,2,3]), " +
+              "   maxDepth: 10 " +
+              "} return foo";
+    checkRightSyntax(query);
   }
 
   @Test
   public void testFilterTypes2() {
-    StringBuilder query = new StringBuilder();
-    query.append("MATCH {");
-    query.append("   types: ['V', 'E'], ");
-    query.append("   as: foo, ");
-    query.append("   where: (name = 'foo' and surname = 'bar' or aaa in [1,2,3]), ");
-    query.append("   maxDepth: 10 ");
-    query.append("} return foo");
-    checkRightSyntax(query.toString());
+      String query = "MATCH {" +
+              "   types: ['V', 'E'], " +
+              "   as: foo, " +
+              "   where: (name = 'foo' and surname = 'bar' or aaa in [1,2,3]), " +
+              "   maxDepth: 10 " +
+              "} return foo";
+    checkRightSyntax(query);
   }
 
   @Test
   public void testMultiPath() {
-    StringBuilder query = new StringBuilder();
-    query.append("MATCH {}");
-    query.append("  .(out().in(){type:'v'}.both('Foo')){maxDepth: 3}.out() return foo");
-    checkRightSyntax(query.toString());
+      String query = "MATCH {}" +
+              "  .(out().in(){type:'v'}.both('Foo')){maxDepth: 3}.out() return foo";
+    checkRightSyntax(query);
   }
 
   @Test