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/**
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* SQL-DK
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* Copyright © 2015 František Kučera (frantovo.cz)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package info.globalcode.sql.dk.jdbc;
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import info.globalcode.sql.dk.Constants;
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import info.globalcode.sql.dk.configuration.Configuration;
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import info.globalcode.sql.dk.configuration.ConfigurationException;
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import info.globalcode.sql.dk.configuration.DatabaseDefinition;
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import info.globalcode.sql.dk.configuration.Loader;
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import info.globalcode.sql.dk.configuration.Properties;
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import info.globalcode.sql.dk.configuration.Property;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.DriverPropertyInfo;
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import java.sql.SQLException;
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import java.sql.SQLFeatureNotSupportedException;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* <p>
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* Meta JDBC driver that works as redirector/router. It loads SQL-DK's configuration file and
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* instantiates a real JDBC connection (PostgreSQL, MariDB etc.) of given name.
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* </p>
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*
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* <p>
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* Raison d'être: user can define his/her database connections just once (in SQL-DK's configuration)
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* and use them in many other programs – there is no need to define the connection (hostname,
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* username, password, properties…) in each application again and again. User will simply connect to
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* e.g. <code>jdbc:sql-dk://my-connection</code> and this driver reads parameters of
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* <code>my-connection</code> from SQL-DK's configuration and returns real driver implementation.
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* </p>
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*
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* <p>
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* Of course, the real JDBC driver for given database is still needed on the class path.
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* </p>
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*
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* <p>
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* TODO: current version is quite heavy-weight, because it includes whole SQL-DK source tree. Some
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* refactoring and separation is desired to provide more light-weight JDBC driver. However the
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* public interface and behavior of this driver should remain unchanged.
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* </p>
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*
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* @author Ing. František Kučera (frantovo.cz)
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*/
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public class Driver implements java.sql.Driver {
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private static final Logger log = Logger.getLogger(Driver.class.getName());
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private final Loader loader = new Loader();
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static {
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try {
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DriverManager.registerDriver(new Driver());
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} catch (SQLException e) {
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log.log(Level.SEVERE, "Unable to register JDBC driver", e);
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}
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}
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@Override
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public Connection connect(String url, java.util.Properties info) throws SQLException {
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if (acceptsURL(url)) {
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log.log(Level.FINER, "Loading SQL-DK configuration for URL: {0}", url);
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String name = extractDatabaseName(url);
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log.log(Level.FINE, "Loading SQL-DK configuration for name: {0}", name);
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try {
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return getConnection(name, info);
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} catch (ConfigurationException e) {
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log.log(Level.SEVERE, "Unable to load SQL-DK configuration for name: {0}. Is it defined in {1}?", new Object[]{name, Constants.CONFIG_FILE});
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throw new SQLException("Unable to load SQL-DK configuration for name: " + name, e);
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}
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} else {
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throw new SQLException("Unsupported URL: " + url);
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}
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}
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private Connection getConnection(String connectionName, java.util.Properties info) throws SQLException, ConfigurationException {
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Configuration c = loader.loadConfiguration();
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DatabaseDefinition dd = c.getDatabase(connectionName);
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if (acceptsURL(dd.getUrl())) {
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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});
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throw new ConfigurationException("SQL-DK meta JDBC driver loops to itself.");
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} else {
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return Loader.jdbcConnect(dd, translate(info));
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}
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}
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private String extractDatabaseName(String url) {
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return url.split("//", 2)[1];
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}
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/**
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* TODO: refactor/move, reuse
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*
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* @param info
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* @return
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*/
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private Properties translate(java.util.Properties info) {
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Properties properties = new Properties();
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for (String name : info.stringPropertyNames()) {
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String value = info.getProperty(name);
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properties.add(new Property(name, value));
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}
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return properties;
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}
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@Override
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public boolean acceptsURL(String url) throws SQLException {
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return url != null && url.startsWith("jdbc:sql-dk://");
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}
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@Override
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public DriverPropertyInfo[] getPropertyInfo(String url, java.util.Properties info) throws SQLException {
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return new DriverPropertyInfo[0];
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}
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@Override
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public int getMajorVersion() {
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return 0;
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}
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@Override
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public int getMinorVersion() {
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return 1;
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}
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@Override
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public boolean jdbcCompliant() {
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return false;
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}
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@Override
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public Logger getParentLogger() throws SQLFeatureNotSupportedException {
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throw new SQLFeatureNotSupportedException("Not supported yet.");
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}
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}
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