src/main/java/at/ac/tuwien/sepm/assignment/groupphase/util/JDBCConnectionManager.java


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package at.ac.tuwien.sepm.assignment.groupphase.util;

import java.lang.invoke.MethodHandles;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class JDBCConnectionManager {

    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
    private static final String DEFAULT_CONNECTION_URL =
            "jdbc:h2:./sepm;INIT=RUNSCRIPT FROM 'classpath:sql/database.sql'";
    private String connectionUrl;
    private Connection connection;

    public JDBCConnectionManager() {
        this(DEFAULT_CONNECTION_URL);
    }

    public JDBCConnectionManager(String connectionUrl) {
        this.connectionUrl = connectionUrl;
        try {
            Class.forName("org.h2.Driver");
        } catch (ClassNotFoundException e) {
            LOG.error("Failed to load H2 JDBC driver '{}'", e.getMessage(), e);
            throw new IllegalStateException(e);
        }
    }

    public Connection getConnection() throws SQLException {
        if (connection == null) connection = DriverManager.getConnection(connectionUrl);

        return connection;
    }

    public void closeConnection() {
        if (connection == null) return;

        try {
            connection.close();
        } catch (SQLException e) {
            LOG.error("Failed to close connection '{}'", e.getMessage(), e);
        }
        connection = null;
    }

    public void rollbackConnection() {
        try {
            connection.rollback();
        } catch (SQLException e) {
            LOG.error("Failed to rollback connection", e);
        }
    }
}