1.1 --- a/java/jdbc-dk-driver/src/info/globalcode/sql/dk/jdbc/Driver.java Mon Mar 04 20:15:24 2019 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,157 +0,0 @@
1.4 -/**
1.5 - * SQL-DK
1.6 - * Copyright © 2015 František Kučera (frantovo.cz)
1.7 - *
1.8 - * This program is free software: you can redistribute it and/or modify
1.9 - * it under the terms of the GNU General Public License as published by
1.10 - * the Free Software Foundation, either version 3 of the License, or
1.11 - * (at your option) any later version.
1.12 - *
1.13 - * This program is distributed in the hope that it will be useful,
1.14 - * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.15 - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.16 - * GNU General Public License for more details.
1.17 - *
1.18 - * You should have received a copy of the GNU General Public License
1.19 - * along with this program. If not, see <http://www.gnu.org/licenses/>.
1.20 - */
1.21 -package info.globalcode.sql.dk.jdbc;
1.22 -
1.23 -import info.globalcode.sql.dk.Constants;
1.24 -import info.globalcode.sql.dk.configuration.Configuration;
1.25 -import info.globalcode.sql.dk.configuration.ConfigurationException;
1.26 -import info.globalcode.sql.dk.configuration.DatabaseDefinition;
1.27 -import info.globalcode.sql.dk.configuration.Loader;
1.28 -import info.globalcode.sql.dk.configuration.Properties;
1.29 -import info.globalcode.sql.dk.configuration.Property;
1.30 -import java.sql.Connection;
1.31 -import java.sql.DriverManager;
1.32 -import java.sql.DriverPropertyInfo;
1.33 -import java.sql.SQLException;
1.34 -import java.sql.SQLFeatureNotSupportedException;
1.35 -import java.util.logging.Level;
1.36 -import java.util.logging.Logger;
1.37 -
1.38 -/**
1.39 - * <p>
1.40 - * Meta JDBC driver that works as redirector/router. It loads SQL-DK's configuration file and
1.41 - * instantiates a real JDBC connection (PostgreSQL, MariDB etc.) of given name.
1.42 - * </p>
1.43 - *
1.44 - * <p>
1.45 - * Raison d'être: user can define his/her database connections just once (in SQL-DK's configuration)
1.46 - * and use them in many other programs – there is no need to define the connection (hostname,
1.47 - * username, password, properties…) in each application again and again. User will simply connect to
1.48 - * e.g. <code>jdbc:sql-dk://my-connection</code> and this driver reads parameters of
1.49 - * <code>my-connection</code> from SQL-DK's configuration and returns real driver implementation.
1.50 - * </p>
1.51 - *
1.52 - * <p>
1.53 - * Of course, the real JDBC driver for given database is still needed on the class path.
1.54 - * </p>
1.55 - *
1.56 - * <p>
1.57 - * TODO: current version is quite heavy-weight, because it includes whole SQL-DK source tree. Some
1.58 - * refactoring and separation is desired to provide more light-weight JDBC driver. However the
1.59 - * public interface and behavior of this driver should remain unchanged.
1.60 - * </p>
1.61 - *
1.62 - * @author Ing. František Kučera (frantovo.cz)
1.63 - */
1.64 -public class Driver implements java.sql.Driver {
1.65 -
1.66 - private static final Logger log = Logger.getLogger(Driver.class.getName());
1.67 -
1.68 - private final Loader loader = new Loader();
1.69 -
1.70 - static {
1.71 - try {
1.72 - DriverManager.registerDriver(new Driver());
1.73 - } catch (SQLException e) {
1.74 - log.log(Level.SEVERE, "Unable to register JDBC driver", e);
1.75 - }
1.76 - }
1.77 -
1.78 - @Override
1.79 - public Connection connect(String url, java.util.Properties info) throws SQLException {
1.80 - if (acceptsURL(url)) {
1.81 - log.log(Level.FINER, "Loading SQL-DK configuration for URL: {0}", url);
1.82 - String name = extractDatabaseName(url);
1.83 - log.log(Level.FINE, "Loading SQL-DK configuration for name: {0}", name);
1.84 -
1.85 - try {
1.86 - return getConnection(name, info);
1.87 - } catch (ConfigurationException e) {
1.88 - log.log(Level.SEVERE, "Unable to load SQL-DK configuration for name: {0}. Is it defined in {1}?", new Object[]{name, Constants.CONFIG_FILE});
1.89 - throw new SQLException("Unable to load SQL-DK configuration for name: " + name, e);
1.90 - }
1.91 - } else {
1.92 - // The driver should return "null" if it realizes it is the wrong kind of driver to connect to the given URL.
1.93 - return null;
1.94 - }
1.95 - }
1.96 -
1.97 - private Connection getConnection(String connectionName, java.util.Properties info) throws SQLException, ConfigurationException {
1.98 - Configuration c = loader.loadConfiguration();
1.99 - DatabaseDefinition dd = c.getDatabase(connectionName);
1.100 -
1.101 - if (acceptsURL(dd.getUrl())) {
1.102 - log.log(Level.SEVERE, "SQL-DK meta JDBC driver loops to itself: {0} → {1} Please check {2}", new Object[]{connectionName, dd.getUrl(), Constants.CONFIG_FILE});
1.103 - throw new ConfigurationException("SQL-DK meta JDBC driver loops to itself.");
1.104 - } else {
1.105 - return Loader.jdbcConnect(dd, translate(info));
1.106 - }
1.107 - }
1.108 -
1.109 - private String extractDatabaseName(String url) {
1.110 - return url.split("//", 2)[1];
1.111 - }
1.112 -
1.113 - /**
1.114 - * TODO: refactor/move, reuse
1.115 - *
1.116 - * @param info
1.117 - * @return
1.118 - */
1.119 - private Properties translate(java.util.Properties info) {
1.120 - Properties properties = new Properties();
1.121 -
1.122 - for (String name : info.stringPropertyNames()) {
1.123 - String value = info.getProperty(name);
1.124 - properties.add(new Property(name, value));
1.125 - }
1.126 -
1.127 - return properties;
1.128 - }
1.129 -
1.130 - @Override
1.131 - public boolean acceptsURL(String url) throws SQLException {
1.132 - return url != null && url.startsWith("jdbc:sql-dk://");
1.133 - }
1.134 -
1.135 - @Override
1.136 - public DriverPropertyInfo[] getPropertyInfo(String url, java.util.Properties info) throws SQLException {
1.137 - return new DriverPropertyInfo[0];
1.138 - }
1.139 -
1.140 - @Override
1.141 - public int getMajorVersion() {
1.142 - return 0;
1.143 - }
1.144 -
1.145 - @Override
1.146 - public int getMinorVersion() {
1.147 - return 1;
1.148 - }
1.149 -
1.150 - @Override
1.151 - public boolean jdbcCompliant() {
1.152 - return false;
1.153 - }
1.154 -
1.155 - @Override
1.156 - public Logger getParentLogger() throws SQLFeatureNotSupportedException {
1.157 - throw new SQLFeatureNotSupportedException("Not supported yet.");
1.158 - }
1.159 -
1.160 -}