Lets the interface cache local song/album data

This will let the interface avoid a system scan every time, improving performance.

interface/src/test/java/DBTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+import edu.regis.universeplayer.player.Interface;
+import org.junit.Test;
+
+import java.io.File;
+import java.sql.*;
+
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertTrue;
+
+public class DBTest
+{
+    @Test
+    public void test() throws ClassNotFoundException, SQLException
+    {
+        try
+        {
+            Class.forName("org.sqlite.JDBC");
+            Connection db;
+            Statement stat;
+            ResultSet tableResult;
+//            db = DriverManager.getConnection("jdbc:sqlite:" + new File(Interface.getDataDir().getAbsolutePath(), "universalmusictest.db").getAbsolutePath());
+//            db.setAutoCommit(false);
+//            stat = db.createStatement();
+//            tableResult = stat.executeQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='INFO';");
+//            if (!tableResult.next())
+//            {
+//                System.out.println("Creating song table");
+//                /*
+//                 * Create the table
+//                 */
+//                stat.executeUpdate("CREATE TABLE INFO" +
+//                        "(DATA INTEGER PRIMARY KEY NOT NULL);");
+//            }
+//            else
+//            {
+//                System.out.println("Clearing table");
+//                stat.executeUpdate("DELETE FROM INFO;");
+//            }
+//            tableResult.close();
+//            stat.executeUpdate("INSERT INTO INFO (DATA) VALUES (1);");
+//            stat.close();
+//            db.commit();
+//            db.close();
+    
+            db = DriverManager.getConnection("jdbc:sqlite:" + new File(Interface.getDataDir().getAbsolutePath(), "universalmusictest.db").getAbsolutePath());
+            db.setAutoCommit(false);
+            stat = db.createStatement();
+            tableResult = stat.executeQuery("SELECT (DATA) FROM INFO");
+            assertTrue(tableResult.next());
+            assertEquals(1, tableResult.getInt("DATA"));
+            tableResult.close();
+            stat.close();
+            db.close();
+        }
+        catch (SQLException e)
+        {
+            e.printStackTrace();
+            throw e;
+        }
+    }
+}