Graph.toString and Graph.nodeCountByLabel (like in odb)

core/src/main/scala/flatgraph/Graph.scala

@@ -157,4 +157,15 @@ class Graph(val schema: Schema, val storagePathMaybe: Option[Path] = None) exten
     }
   }
 
+  override def toString(): String =
+    s"Graph[${nodeCount()} nodes]"
+
+  def nodeCountByLabel: Map[String, Int] = {
+    schema.nodeKinds
+      .map(schema.getNodeLabel)
+      .map(label => label -> nodeCount(label))
+      .filter { case (label, count) => count > 0 }
+      .toMap
+  }
+
 }

core/src/test/scala/flatgraph/GraphTests.scala

@@ -173,6 +173,9 @@ class GraphTests extends AnyWordSpec with Matchers {
     Accessors.getNeighborsIn(V0_0_GNode).size shouldBe 2
     V0_0_GNode.out.size shouldBe 1
     V0_0_GNode.in.size shouldBe 2
+
+    g.toString shouldBe "Graph[4 nodes]"
+    g.nodeCountByLabel shouldBe Map("V0" -> 2, "V1" -> 2)
   }
 
   val schema = TestSchema.make(1, 1)

domain-classes-generator/src/main/scala/flatgraph/codegen/DomainClassesGenerator.scala

@@ -890,6 +890,9 @@ class DomainClassesGenerator(schema: Schema) {
          |
          |  override def close(): Unit =
          |    _graph.close()
+         |
+         |  override def toString(): String =
+         |    String.format("$domainShortName[%s]", graph)
          |}
          |
          |@flatgraph.help.TraversalSource