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java/org/apache/tomcat/dbcp/dbcp2/DriverFactory.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.tomcat.dbcp.dbcp2;
+
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+/*
+ * Creates {@link Driver} instances.
+ *
+ * @since 2.7.0
+ */
+class DriverFactory {
+
+    static Driver createDriver(final BasicDataSource basicDataSource) throws SQLException {
+        // Load the JDBC driver class
+        Driver driverToUse = basicDataSource.getDriver();
+        String driverClassName = basicDataSource.getDriverClassName();
+        ClassLoader driverClassLoader = basicDataSource.getDriverClassLoader();
+        String url = basicDataSource.getUrl();
+
+        if (driverToUse == null) {
+            Class<?> driverFromCCL = null;
+            if (driverClassName != null) {
+                try {
+                    try {
+                        if (driverClassLoader == null) {
+                            driverFromCCL = Class.forName(driverClassName);
+                        } else {
+                            driverFromCCL = Class.forName(driverClassName, true, driverClassLoader);
+                        }
+                    } catch (final ClassNotFoundException cnfe) {
+                        driverFromCCL = Thread.currentThread().getContextClassLoader().loadClass(driverClassName);
+                    }
+                } catch (final Exception t) {
+                    final String message = "Cannot load JDBC driver class '" + driverClassName + "'";
+                    basicDataSource.log(message, t);
+                    throw new SQLException(message, t);
+                }
+            }
+
+            try {
+                if (driverFromCCL == null) {
+                    driverToUse = DriverManager.getDriver(url);
+                } else {
+                    // Usage of DriverManager is not possible, as it does not
+                    // respect the ContextClassLoader
+                    // N.B. This cast may cause ClassCastException which is
+                    // handled below
+                    driverToUse = (Driver) driverFromCCL.getConstructor().newInstance();
+                    if (!driverToUse.acceptsURL(url)) {
+                        throw new SQLException("No suitable driver", "08001");
+                    }
+                }
+            } catch (final Exception t) {
+                final String message = "Cannot create JDBC driver of class '"
+                        + (driverClassName != null ? driverClassName : "") + "' for connect URL '" + url + "'";
+                basicDataSource.log(message, t);
+                throw new SQLException(message, t);
+            }
+        }
+        return driverToUse;
+    }
+
+}