preparing file service

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

files/src/main/java/de/srsoftware/umbrella/files/Constants.java

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+package de.srsoftware.umbrella.files;
+
+public class Constants {
+	public static final String CONFIG_DATABASE = "umbrella.modules.files.database";
+}

files/src/main/java/de/srsoftware/umbrella/files/FileDb.java

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+package de.srsoftware.umbrella.files;
+
+public interface FileDb {
+}

files/src/main/java/de/srsoftware/umbrella/files/FileModule.java

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+package de.srsoftware.umbrella.files;
+
+import de.srsoftware.configuration.Configuration;
+import de.srsoftware.umbrella.core.BaseHandler;
+import de.srsoftware.umbrella.core.ModuleRegistry;
+import de.srsoftware.umbrella.core.api.FileService;
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+
+import static de.srsoftware.umbrella.core.ConnectionProvider.connect;
+import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
+import static de.srsoftware.umbrella.files.Constants.CONFIG_DATABASE;
+
+public class FileModule extends BaseHandler implements FileService {
+
+	FileDb fileDb;
+
+	public FileModule(Configuration config) throws UmbrellaException {
+		super();
+		var dbFile = config.get(CONFIG_DATABASE).orElseThrow(() -> missingFieldException(CONFIG_DATABASE));
+		fileDb = new SqliteDb(connect(dbFile));
+		ModuleRegistry.add(this);
+	}
+
+}

files/src/main/java/de/srsoftware/umbrella/files/SqliteDb.java

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+package de.srsoftware.umbrella.files;
+
+import java.sql.Connection;
+
+public class SqliteDb implements FileDb {
+	private final Connection db;
+
+	public SqliteDb(Connection conn) {
+		this.db = conn;
+	}
+}