public DatabaseProvider()

in app/src/main/java/org/apache/roller/weblogger/business/DatabaseProvider.java [83:153]
62 lines of code
10 McCabe index (conditional complexity)

    public DatabaseProvider() throws StartupException {
        
        String connectionTypeString = 
                WebloggerConfig.getProperty("database.configurationType"); 
        if ("jdbc".equals(connectionTypeString)) {
            type = ConfigurationType.JDBC_PROPERTIES;
        }
        jndiName =          WebloggerConfig.getProperty("database.jndi.name");
        jdbcDriverClass =   WebloggerConfig.getProperty("database.jdbc.driverClass");
        jdbcConnectionURL = WebloggerConfig.getProperty("database.jdbc.connectionURL");
        jdbcUsername =      WebloggerConfig.getProperty("database.jdbc.username");
        jdbcPassword =      WebloggerConfig.getProperty("database.jdbc.password");
        
        successMessage("SUCCESS: Got parameters. Using configuration type " + type);

        // If we're doing JDBC then attempt to load JDBC driver class
        if (getType() == ConfigurationType.JDBC_PROPERTIES) {
            successMessage("-- Using JDBC driver class: "   + jdbcDriverClass);
            successMessage("-- Using JDBC connection URL: " + jdbcConnectionURL);
            successMessage("-- Using JDBC username: "       + jdbcUsername);
            successMessage("-- Using JDBC password: [hidden]");
            try {
                Class.forName(getJdbcDriverClass());
            } catch (ClassNotFoundException ex) {
                String errorMsg = 
                     "ERROR: cannot load JDBC driver class [" + getJdbcDriverClass()+ "]. "
                    +"Likely problem: JDBC driver jar missing from server classpath.";
                errorMessage(errorMsg);
                throw new StartupException(errorMsg, ex, startupLog);
            }
            successMessage("SUCCESS: loaded JDBC driver class [" +getJdbcDriverClass()+ "]");
            
            if (getJdbcUsername() != null || getJdbcPassword() != null) {
                props = new Properties();
                if (getJdbcUsername() != null) {
                    props.setProperty("user", getJdbcUsername());
                }
                if (getJdbcPassword() != null) {
                    props.setProperty("password", getJdbcPassword());
                }
            }
            
        // Else attempt to locate JNDI datasource
        } else { 
            String name = getFullJndiName();
            successMessage("-- Using JNDI datasource name: " + name);
            try {
                InitialContext ic = new InitialContext();
                dataSource = (DataSource)ic.lookup(name);
            } catch (NamingException ex) {
                String errorMsg = 
                    "ERROR: cannot locate JNDI DataSource [" +name+ "]. "
                   +"Likely problem: no DataSource or datasource is misconfigured.";
                errorMessage(errorMsg);
                throw new StartupException(errorMsg, ex, startupLog);
            }            
            successMessage("SUCCESS: located JNDI DataSource [" +name+ "]");
        }
        
        // So far so good. Now, can we get a connection?
        try { 
            Connection testcon = getConnection();
            testcon.close();
        } catch (Exception e) {
            String errorMsg = 
                "ERROR: unable to obtain database connection. "
               +"Likely problem: bad connection parameters or database unavailable.";
            errorMessage(errorMsg);
            throw new StartupException(errorMsg, e, startupLog);
        }
    }