--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.jdbc.AutoloadedDriver\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to You under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.jdbc;\r
+\r
+import java.sql.DriverManager;\r
+import java.sql.Driver;\r
+import java.sql.Connection;\r
+import java.sql.DriverPropertyInfo;\r
+import java.sql.SQLException;\r
+import java.sql.SQLFeatureNotSupportedException;\r
+import java.io.PrintStream;\r
+import java.util.Properties;\r
+import java.util.logging.Logger;\r
+\r
+import org.apache.derby.iapi.reference.MessageId;\r
+import org.apache.derby.iapi.reference.Attribute;\r
+import org.apache.derby.iapi.services.i18n.MessageService;\r
+import org.apache.derby.iapi.jdbc.JDBCBoot;\r
+\r
+\r
+/**\r
+ This is the dummy driver which is registered with the DriverManager and\r
+ which is autoloaded by JDBC4. Loading this class will NOT automatically boot the Derby engine.\r
+ Instead, the engine boots lazily when you ask for a\r
+ Connection. Alternatively, you can force the engine to boot as follows:\r
+\r
+ <PRE>\r
+ Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();\r
+\r
+ // or\r
+\r
+ new org.apache.derby.jdbc.EmbeddedDriver();\r
+\r
+ \r
+ </PRE>\r
+*/\r
+public class AutoloadedDriver implements Driver\r
+{\r
+ // This flag is set if the engine is forcibly brought down.\r
+ private static boolean _engineForcedDown = false;\r
+ \r
+ //\r
+ // This is the driver that's specific to the JDBC level we're running at.\r
+ // It's the module which boots the whole Derby engine.\r
+ //\r
+ private static Driver _driverModule;\r
+ \r
+ static\r
+ {\r
+ try {\r
+ DriverManager.registerDriver( new AutoloadedDriver() );\r
+ }\r
+ catch (SQLException se)\r
+ {\r
+ String message = MessageService.getTextMessage\r
+ (MessageId.JDBC_DRIVER_REGISTER_ERROR, se.getMessage() );\r
+\r
+ throw new IllegalStateException( message );\r
+ }\r
+ }\r
+\r
+ /*\r
+ ** Methods from java.sql.Driver.\r
+ */\r
+ /**\r
+ Accept anything that starts with <CODE>jdbc:derby:</CODE>.\r
+ @exception SQLException if a database-access error occurs.\r
+ @see java.sql.Driver\r
+ */\r
+ public boolean acceptsURL(String url) throws SQLException {\r
+\r
+ //\r
+ // We don't want to accidentally boot the engine just because\r
+ // the application is looking for a connection from some other\r
+ // driver.\r
+ //\r
+ return !_engineForcedDown && InternalDriver.embeddedDriverAcceptsURL(url);\r
+ }\r
+\r
+ \r
+ /**\r
+ Connect to the URL if possible\r
+ @exception SQLException illegal url or problem with connectiong\r
+ @see java.sql.Driver\r
+ */\r
+ public Connection connect(String url, Properties info)\r
+ throws SQLException\r
+ {\r
+ //\r
+ // This pretty piece of logic compensates for the following behavior\r
+ // of the DriverManager: When asked to get a Connection, the\r
+ // DriverManager cycles through all of its autoloaded drivers, looking\r
+ // for one which will return a Connection. Without this pretty logic,\r
+ // the embedded driver module will be booted by any request for\r
+ // a connection which cannot be satisfied by drivers ahead of us\r
+ // in the list.\r
+ if (!InternalDriver.embeddedDriverAcceptsURL(url)) { return null; }\r
+\r
+ return getDriverModule().connect(url, info);\r
+ }\r
+\r
+ /**\r
+ * Returns an array of DriverPropertyInfo objects describing possible properties.\r
+ @exception SQLException if a database-access error occurs.\r
+ @see java.sql.Driver\r
+ */\r
+ public DriverPropertyInfo[] getPropertyInfo(String url, Properties info)\r
+ throws SQLException\r
+ {\r
+ return getDriverModule().getPropertyInfo(url, info);\r
+ }\r
+\r
+ /**\r
+ * Returns the driver's major version number. \r
+ @see java.sql.Driver\r
+ */\r
+ public int getMajorVersion() {\r
+ try {\r
+ return (getDriverModule().getMajorVersion());\r
+ }\r
+ catch (SQLException se) {\r
+ return 0;\r
+ }\r
+ }\r
+ /**\r
+ * Returns the driver's minor version number.\r
+ @see java.sql.Driver\r
+ */\r
+ public int getMinorVersion() {\r
+ try {\r
+ return (getDriverModule().getMinorVersion());\r
+ }\r
+ catch (SQLException se) {\r
+ return 0;\r
+ }\r
+ }\r
+\r
+ /**\r
+ * Report whether the Driver is a genuine JDBC COMPLIANT (tm) driver.\r
+ @see java.sql.Driver\r
+ */\r
+ public boolean jdbcCompliant() {\r
+ try {\r
+ return (getDriverModule().jdbcCompliant());\r
+ }\r
+ catch (SQLException se) {\r
+ return false;\r
+ }\r
+ }\r
+\r
+ ///////////////////////////////////////////////////////////////////////\r
+ //\r
+ // Support for booting and shutting down the engine.\r
+ //\r
+ ///////////////////////////////////////////////////////////////////////\r
+\r
+ /*\r
+ ** Retrieve the driver which is specific to our JDBC level.\r
+ ** We defer real work to this specific driver.\r
+ */\r
+ static Driver getDriverModule() throws SQLException {\r
+\r
+ if ( _engineForcedDown )\r
+ {\r
+ // Driver not registered \r
+ throw new SQLException\r
+ (MessageService.getTextMessage(MessageId.CORE_JDBC_DRIVER_UNREGISTERED));\r
+ }\r
+\r
+ if ( !isBooted() ) { EmbeddedDriver.boot(); }\r
+\r
+ return _driverModule;\r
+ }\r
+ \r
+ /*\r
+ ** Record which driver module actually booted.\r
+ */\r
+ static void registerDriverModule( Driver driver )\r
+ {\r
+ _driverModule = driver;\r
+ _engineForcedDown = false;\r
+ }\r
+ \r
+ /*\r
+ ** Unregister the driver. This happens when the engine is\r
+ ** forcibly shut down.\r
+ */\r
+ static void unregisterDriverModule()\r
+ {\r
+ _driverModule = null;\r
+ _engineForcedDown = true;\r
+ }\r
+ \r
+\r
+ /*\r
+ ** Return true if the engine has been booted.\r
+ */\r
+ private static boolean isBooted()\r
+ {\r
+ return ( _driverModule != null );\r
+ }\r
+\r
+\r
+ public Logger getParentLogger() throws SQLFeatureNotSupportedException {\r
+ // TODO Auto-generated method stub\r
+ return null;\r
+ }\r
+ \r
+}\r
+\r
projects / Benchmarks_CSolver.git / blobdiff