Add basic DatabaseConnection to API

api/src/main/java/com/alttd/chat/database/DatabaseConnection.java

@@ -0,0 +1,86 @@
+package com.alttd.chat.database;
+
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class DatabaseConnection {
+
+    private static DatabaseConnection instance;
+    private Connection connection;
+    private final String drivers, ip, port, database, username, password;
+
+    /**
+     * Sets information for the database and opens the connection.
+     */
+    public DatabaseConnection() {
+
+        /*this.drivers = Config.drivers;
+        this.ip = Config.ip;
+        this.port = Config.port;
+        this.database = Config.database;
+        this.username = Config.username;
+        this.password = Config.password;*/
+        // temp to make compile, remove when config is added
+        this.drivers = this.ip = this.port = this.database = this.username = this.password = "";
+        instance = this;
+
+        try {
+            instance.openConnection();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Opens the connection if it's not already open.
+     * @throws SQLException If it can't create the connection.
+     */
+    public void openConnection() throws SQLException {
+        if (connection != null && !connection.isClosed()) {
+            return;
+        }
+
+        synchronized (this) {
+            if (connection != null && !connection.isClosed()) {
+                return;
+            }
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            }
+            connection = DriverManager.getConnection(
+                    "jdbc:" + drivers + "://" + ip + ":" + port + "/" + database + "?autoReconnect=true", username,
+                    password);
+        }
+    }
+
+    /**
+     * Returns the connection for the database
+     * @return Returns the connection.
+     */
+    public static Connection getConnection() {
+        try {
+            instance.openConnection();
+        }
+        catch (SQLException e) {
+            e.printStackTrace();
+        }
+        catch (Exception e){
+            e.printStackTrace();
+        }
+
+        return instance.connection;
+    }
+
+    /**
+     * Sets the connection for this instance
+     */
+    public boolean initialize() {
+        instance = new DatabaseConnection();
+        return connection != null;
+    }
+
+}