/**
* Removes the specified driver from the {@code DriverManager}'s list of registered drivers.
*
* <p>If a {@code null} value is specified for the driver to be removed, then no action is taken.
*
* <p>If a security manager exists and its {@code checkPermission} denies permission, then a
* {@code SecurityException} will be thrown.
*
* <p>If the specified driver is not found in the list of registered drivers, then no action is
* taken. If the driver was found, it will be removed from the list of registered drivers.
*
* <p>If a {@code DriverAction} instance was specified when the JDBC driver was registered, its
* deregister method will be called prior to the driver being removed from the list of registered
* drivers.
*
* @param driver the JDBC Driver to remove
* @exception SQLException if a database access error occurs
* @throws SecurityException if a security manager exists and its {@code checkPermission} method
* denies permission to deregister a driver.
* @see SecurityManager#checkPermission
*/
@CallerSensitive
public static synchronized void deregisterDriver(Driver driver) throws SQLException {
if (driver == null) {
return;
}
SecurityManager sec = System.getSecurityManager();
if (sec != null) {
sec.checkPermission(DEREGISTER_DRIVER_PERMISSION);
}
println("DriverManager.deregisterDriver: " + driver);
DriverInfo aDriver = new DriverInfo(driver, null);
if (registeredDrivers.contains(aDriver)) {
if (isDriverAllowed(driver, Reflection.getCallerClass())) {
DriverInfo di = registeredDrivers.get(registeredDrivers.indexOf(aDriver));
// If a DriverAction was specified, Call it to notify the
// driver that it has been deregistered
if (di.action() != null) {
di.action().deregister();
}
registeredDrivers.remove(aDriver);
} else {
// If the caller does not have permission to load the driver then
// throw a SecurityException.
throw new SecurityException();
}
} else {
println(" couldn't find driver to unload");
}
}
/**
* Attempts to locate a driver that understands the given URL. The <code>DriverManager</code>
* attempts to select an appropriate driver from the set of registered JDBC drivers.
*
* @param url a database URL of the form <code>jdbc:<em>subprotocol</em>:<em>subname</em></code>
* @return a <code>Driver</code> object representing a driver that can connect to the given URL
* @exception SQLException if a database access error occurs
*/
@CallerSensitive
public static Driver getDriver(String url) throws SQLException {
println("DriverManager.getDriver(\"" + url + "\")");
Class<?> callerClass = Reflection.getCallerClass();
// Walk through the loaded registeredDrivers attempting to locate someone
// who understands the given URL.
for (DriverInfo aDriver : registeredDrivers) {
// If the caller does not have permission to load the driver then
// skip it.
if (isDriverAllowed(aDriver.driver, callerClass)) {
try {
if (aDriver.driver.acceptsURL(url)) {
// Success!
println("getDriver returning " + aDriver.driver.getClass().getName());
return (aDriver.driver);
}
} catch (SQLException sqe) {
// Drop through and try the next driver.
}
} else {
println(" skipping: " + aDriver.driver.getClass().getName());
}
}
println("getDriver: no suitable driver");
throw new SQLException("No suitable driver", "08001");
}
static {
String title = ING_TRACE_NAME + "-Driver";
/*
** Initialize Ingres driver tracing.
*/
IngConfig.setDriverVers(driverMajorVersion, driverMinorVersion, driverPatchVersion);
TraceLog traceLog = IngTrace.getTraceLog();
/*
** Create IngresDriver object and register with DriverManager.
*/
try {
DriverManager.registerDriver(new IngresDriver());
DriverManager.println(
ING_DRIVER_NAME
+ ": Version "
+ driverMajorVersion
+ "."
+ driverMinorVersion
+ "."
+ driverPatchVersion
+ " ("
+ driverJdbcVersion
+ ")");
DriverManager.println(driverVendor);
traceLog.write(title + ": registered");
} catch (Exception ex) {
DriverManager.println(ING_DRIVER_NAME + ": registration failed!");
traceLog.write(title + ": registration failed!");
}
} // <class initializer>
/**
* Print a diagnostic message to the output stream provided by the DataSource or the
* DriverManager.
*
* @param message the diagnostic message to print
*/
public static void println(String message) {
if (log != null) {
log.println(message);
} else {
DriverManager.println(message);
}
}
/**
* Registers the given driver with the {@code DriverManager}. A newly-loaded driver class should
* call the method {@code registerDriver} to make itself known to the {@code DriverManager}. If
* the driver is currently registered, no action is taken.
*
* @param driver the new JDBC Driver that is to be registered with the {@code DriverManager}
* @param da the {@code DriverAction} implementation to be used when {@code
* DriverManager#deregisterDriver} is called
* @exception SQLException if a database access error occurs
* @exception NullPointerException if {@code driver} is null
* @since 1.8
*/
public static synchronized void registerDriver(java.sql.Driver driver, DriverAction da)
throws SQLException {
/* Register the driver if it has not already been added to our list */
if (driver != null) {
registeredDrivers.addIfAbsent(new DriverInfo(driver, da));
} else {
// This is for compatibility with the original DriverManager
throw new NullPointerException();
}
println("registerDriver: " + driver);
}
// Worker method called by the public getConnection() methods.
private static Connection getConnection(String url, java.util.Properties info, Class<?> caller)
throws SQLException {
/*
* When callerCl is null, we should check the application's
* (which is invoking this class indirectly)
* classloader, so that the JDBC driver class outside rt.jar
* can be loaded from here.
*/
ClassLoader callerCL = caller != null ? caller.getClassLoader() : null;
synchronized (DriverManager.class) {
// synchronize loading of the correct classloader.
if (callerCL == null) {
callerCL = Thread.currentThread().getContextClassLoader();
}
}
if (url == null) {
throw new SQLException("The url cannot be null", "08001");
}
println("DriverManager.getConnection(\"" + url + "\")");
// Walk through the loaded registeredDrivers attempting to make a connection.
// Remember the first exception that gets raised so we can reraise it.
SQLException reason = null;
for (DriverInfo aDriver : registeredDrivers) {
// If the caller does not have permission to load the driver then
// skip it.
if (isDriverAllowed(aDriver.driver, callerCL)) {
try {
println(" trying " + aDriver.driver.getClass().getName());
Connection con = aDriver.driver.connect(url, info);
if (con != null) {
// Success!
println("getConnection returning " + aDriver.driver.getClass().getName());
return (con);
}
} catch (SQLException ex) {
if (reason == null) {
reason = ex;
}
}
} else {
println(" skipping: " + aDriver.getClass().getName());
}
}
// if we got here nobody could connect.
if (reason != null) {
println("getConnection failed: " + reason);
throw reason;
}
println("getConnection: no suitable driver found for " + url);
throw new SQLException("No suitable driver found for " + url, "08001");
}
/**
* Retrieves an Enumeration with all of the currently loaded JDBC drivers to which the current
* caller has access.
*
* <p><B>Note:</B> The classname of a driver can be found using <CODE>d.getClass().getName()
* </CODE>
*
* @return the list of JDBC Drivers loaded by the caller's class loader
*/
@CallerSensitive
public static java.util.Enumeration<Driver> getDrivers() {
java.util.Vector<Driver> result = new java.util.Vector<>();
Class<?> callerClass = Reflection.getCallerClass();
// Walk through the loaded registeredDrivers.
for (DriverInfo aDriver : registeredDrivers) {
// If the caller does not have permission to load the driver then
// skip it.
if (isDriverAllowed(aDriver.driver, callerClass)) {
result.addElement(aDriver.driver);
} else {
println(" skipping: " + aDriver.getClass().getName());
}
}
return (result.elements());
}
/**
* Load the initial JDBC drivers by checking the System property jdbc.properties and then use the
* {@code ServiceLoader} mechanism
*/
static {
loadInitialDrivers();
println("JDBC DriverManager initialized");
}
private static void loadInitialDrivers() {
String drivers;
try {
drivers =
AccessController.doPrivileged(
new PrivilegedAction<String>() {
public String run() {
return System.getProperty("jdbc.drivers");
}
});
} catch (Exception ex) {
drivers = null;
}
// If the driver is packaged as a Service Provider, load it.
// Get all the drivers through the classloader
// exposed as a java.sql.Driver.class service.
// ServiceLoader.load() replaces the sun.misc.Providers()
AccessController.doPrivileged(
new PrivilegedAction<Void>() {
public Void run() {
ServiceLoader<Driver> loadedDrivers = ServiceLoader.load(Driver.class);
Iterator<Driver> driversIterator = loadedDrivers.iterator();
/* Load these drivers, so that they can be instantiated.
* It may be the case that the driver class may not be there
* i.e. there may be a packaged driver with the service class
* as implementation of java.sql.Driver but the actual class
* may be missing. In that case a java.util.ServiceConfigurationError
* will be thrown at runtime by the VM trying to locate
* and load the service.
*
* Adding a try catch block to catch those runtime errors
* if driver not available in classpath but it's
* packaged as service and that service is there in classpath.
*/
try {
while (driversIterator.hasNext()) {
driversIterator.next();
}
} catch (Throwable t) {
// Do nothing
}
return null;
}
});
println("DriverManager.initialize: jdbc.drivers = " + drivers);
if (drivers == null || drivers.equals("")) {
return;
}
String[] driversList = drivers.split(":");
println("number of Drivers:" + driversList.length);
for (String aDriver : driversList) {
try {
println("DriverManager.Initialize: loading " + aDriver);
Class.forName(aDriver, true, ClassLoader.getSystemClassLoader());
} catch (Exception ex) {
println("DriverManager.Initialize: load failed: " + ex);
}
}
}