created repository object to access entities

src/services/repository.js

@@ -0,0 +1,62 @@
+const sql = require('./sql');
+const protected_session = require('./protected_session');
+const Note = require('../entities/note');
+const NoteRevision = require('../entities/note_revision');
+const NoteTree = require('../entities/note_tree');
+const Attribute = require('../entities/attribute');
+
+class Repository {
+    constructor(dataKey) {
+        this.dataKey = protected_session.getDataKey(dataKey);
+    }
+
+    async getEntities(query, params = []) {
+        const rows = await sql.getRows(query, params);
+
+        for (const row of rows) {
+            row.dataKey = this.dataKey;
+        }
+
+        return rows.map(row => this.createEntityFromRow(row));
+    }
+
+    async getEntity(query, params = []) {
+        const row = await sql.getRowOrNull(query, params);
+
+        if (!row) {
+            return null;
+        }
+
+        row.dataKey = this.dataKey;
+
+        return this.createEntityFromRow(row);
+    }
+
+    async getNote(noteId) {
+        return await this.getEntity("SELECT * FROM notes WHERE noteId = ?", [noteId]);
+    }
+
+    createEntityFromRow(row) {
+        let entity;
+
+        if (row.attributeId) {
+            entity = new Attribute(this, row);
+        }
+        else if (row.noteRevisionId) {
+            entity = new NoteRevision(this, row);
+        }
+        else if (row.noteTreeId) {
+            entity = new NoteTree(this, row);
+        }
+        else if (row.noteId) {
+            entity = new Note(this, row);
+        }
+        else {
+            throw new Error('Unknown entity type for row: ' + JSON.stringify(row));
+        }
+
+        return entity;
+    }
+}
+
+module.exports = Repository;