Create an identity at startup if the database doesn't exist.

briar-api/src/net/sf/briar/api/db/DatabaseComponent.java

@@ -37,12 +37,8 @@ import net.sf.briar.api.transport.TemporarySecret;
  */
 public interface DatabaseComponent {
 
-	/**
-	 * Opens the database.
-	 * @param resume true to reopen an existing database or false to create a
-	 * new one.
-	 */
-	void open(boolean resume) throws DbException, IOException;
+	/** Opens the database and returns true if the database already existed. */
+	boolean open() throws DbException, IOException;
 
 	/** Waits for any open transactions to finish and closes the database. */
 	void close() throws DbException, IOException;

briar-api/src/net/sf/briar/api/db/DatabaseConfig.java

@@ -4,7 +4,9 @@ import java.io.File;
 
 public interface DatabaseConfig {
 
-	File getDataDirectory();
+	boolean databaseExists();
+
+	File getDatabaseDirectory();
 
 	char[] getPassword();