basic package graph implemented

Sources/apk/Graph/ApkPackageGraphNode.swift

@@ -0,0 +1,35 @@
+/*
+ * darwin-apk © 2024 Gay Pizza Specifications
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import Foundation
+
+class ApkPackageGraphNode {
+  private weak var graph: ApkPackageGraph!
+  let package: ApkIndexPackage
+
+  //private var _parents = NSHashTable<ApkPackageGraphNode>.weakObjects()
+  //private var _children = NSHashTable<ApkPackageGraphNode>.weakObjects()
+  var parents = [ApkIndexRequirementRef]()
+  var children: [ApkIndexRequirementRef]
+
+  internal init(package: ApkIndexPackage, children: [ApkIndexRequirementRef]) {
+    self.package = package
+    self.children = children
+  }
+}
+
+extension ApkPackageGraphNode: CustomStringConvertible {
+  var description: String {
+    var result = "node[\(self.package.name)]"
+    if !self.parents.isEmpty {
+      result += ", parents[\(self.parents.lazy.map(\.description).joined(separator: ", "))]"
+    }
+    if !self.children.isEmpty {
+      result += ", children[\(self.children.lazy.map(\.description).joined(separator: ", "))]"
+      
+    }
+    return result
+  }
+}