A NodeManager implementation with encoding/decoding keys/values into pages.

pkg/analysis_server/lib/src/index/b_plus_tree.dart

Index: pkg/analysis_server/lib/src/index/b_plus_tree.dart
diff --git a/pkg/analysis_server/lib/src/index/b_plus_tree.dart b/pkg/analysis_server/lib/src/index/b_plus_tree.dart
index 0c346baf4df08388664d263e44bea61e16336672..5622fe399236b8fa9d0e7e9dfd4e90801b6dc1e7 100644
--- a/pkg/analysis_server/lib/src/index/b_plus_tree.dart
+++ b/pkg/analysis_server/lib/src/index/b_plus_tree.dart
@@ -232,7 +232,7 @@ class MemoryNodeManager<K, V> implements NodeManager<K, V, int> {
   }
 
   @override
-  void writeIndex(int id, IndexNodeData<K, V> data) {
+  void writeIndex(int id, IndexNodeData<K, int> data) {
     _indexDataMap[id] = data;
   }
 
@@ -280,7 +280,7 @@ abstract class NodeManager<K, V, N> {
   /**
    * Writes information about the index node with the given identifier.
    */
-  void writeIndex(N id, IndexNodeData<K, V> data);
+  void writeIndex(N id, IndexNodeData<K, N> data);
 
   /**
    * Writes information about the leaf node with the given identifier.