Added condition to prevent adapters from being registered multiple times

src/adapter_wrapper.mjs

@@ -0,0 +1,36 @@
+export function wrapAdapter(adapter) {
+  const wrapped = {};
+
+  ["name", "open", "close", "delete", "sql"].forEach((prop) => {
+    if (!(prop in adapter)) {
+      throw new PawSQLiteError(`Invalid adapter: missing property: ${ prop }`);
+    }
+
+    if (
+      prop === "name" && !(
+        typeof adapter[prop] === "string" ||
+        adapter[prop] instanceof String
+      ) ||
+      prop !== "name" && (
+        typeof adapter[prop] !== "function"
+      )
+    ) {
+      throw new PawSQLiteError("Invalid adapter: invalid type for property: " +
+        prop);
+    }
+
+    if (typeof adapter[prop] === "function") {
+      wrapped[prop] = async (...args) => {
+        try {
+          return await adapter[prop](...args);
+        } catch (err) {
+          throw PawSQLiteError.from(err);
+        }
+      };
+    } else {
+      wrapped[prop] = adapter[prop];
+    }
+  });
+
+  return wrapped;
+}

src/pawsqlite.mjs

@@ -1,4 +1,5 @@
 import { Database } from "./database.mjs";
+import { wrapAdapter } from "./adapter_wrapper.mjs";
 import { PawSQLiteError } from "./pawsqlite_error.mjs";
 import { enableDebug } from "./log.mjs";
 
@@ -20,55 +21,25 @@ export default {
     return adapter.delete(dbName);
   },
   registerAdapter: function(adapter) {
-    adapters.push(wrapAdapter(adapter));
+    const wrapped = wrapAdapter(adapter);
+
+    if (getAdapter(wrapped.name)) {
+      throw new PawSQLiteError(`An adapter with the name: ${ wrapped.name } ` +
+        `Already exists`);
+    }
+
+    adapters.push(wrapped);
   },
   debug: enableDebug,
   Error: PawSQLiteError
 };
 
 
-function wrapAdapter(adapter) {
-  const wrapped = {};
 
-  ["name", "open", "close", "delete", "sql"].forEach((prop) => {
-    if (!(prop in adapter)) {
-      throw new PawSQLiteError(`Invalid adapter: missing property: ${ prop }`);
-    }
-
-    if (
-      prop === "name" && !(
-        typeof adapter[prop] === "string" ||
-        adapter[prop] instanceof String
-      ) ||
-      prop !== "name" && (
-        typeof adapter[prop] !== "function"
-      )
-    ) {
-      throw new PawSQLiteError("Invalid adapter: invalid type for property: " +
-        prop);
-    }
-
-    if (typeof adapter[prop] === "function") {
-      wrapped[prop] = async (...args) => {
-        try {
-          return await adapter[prop](...args);
-        } catch (err) {
-          throw PawSQLiteError.from(err);
-        }
-      };
-    } else {
-      wrapped[prop] = adapter[prop];
-    }
-  });
-
-  return wrapped;
-}
-
-
-function getAdapter(adapterName) {
+function getAdapter(adapterName, silent=false) {
   const adapter = adapters.find((a) => a.name === adapterName);
 
-  if (!adapter) {
+  if (!(silent || adapter)) {
     throw new PawSQLiteError(`Unknown Adapter: ${adapterName}`);
   }