/*
* Copyright 2002-2008 the original author or authors.
*
* Licensed 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.springframework.jdbc.support.nativejdbc;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import org.springframework.util.ReflectionUtils;
/**
* Implementation of the {@link NativeJdbcExtractor} interface for WebLogic,
* supporting WebLogic Server 8.1 and higher.
*
* <p>Returns the underlying native Connection to application code instead
* of WebLogic's wrapper implementation; unwraps the Connection for native
* statements. The returned JDBC classes can then safely be cast, e.g. to
* <code>oracle.jdbc.OracleConnection</code>.
*
* <p>This NativeJdbcExtractor can be set just to <i>allow</i> working
* with a WebLogic DataSource: If a given object is not a WebLogic
* Connection wrapper, it will be returned as-is.
*
* @author Thomas Risberg
* @author Juergen Hoeller
* @since 1.0.2
* @see #getNativeConnection
* @see weblogic.jdbc.extensions.WLConnection#getVendorConnection
*/
public class WebLogicNativeJdbcExtractor extends NativeJdbcExtractorAdapter {
private static final String JDBC_EXTENSION_NAME = "weblogic.jdbc.extensions.WLConnection";
private final Class jdbcExtensionClass;
private final Method getVendorConnectionMethod;
/**
* This constructor retrieves the WebLogic JDBC extension interface,
* so we can get the underlying vendor connection using reflection.
*/
public WebLogicNativeJdbcExtractor() {
try {
this.jdbcExtensionClass = getClass().getClassLoader().loadClass(JDBC_EXTENSION_NAME);
this.getVendorConnectionMethod = this.jdbcExtensionClass.getMethod("getVendorConnection", (Class[]) null);
}
catch (Exception ex) {
throw new IllegalStateException(
"Could not initialize WebLogicNativeJdbcExtractor because WebLogic API classes are not available: " + ex);
}
}
/**
* Return <code>true</code>, as WebLogic returns wrapped Statements.
*/
public boolean isNativeConnectionNecessaryForNativeStatements() {
return true;
}
/**
* Return <code>true</code>, as WebLogic returns wrapped PreparedStatements.
*/
public boolean isNativeConnectionNecessaryForNativePreparedStatements() {
return true;
}
/**
* Return <code>true</code>, as WebLogic returns wrapped CallableStatements.
*/
public boolean isNativeConnectionNecessaryForNativeCallableStatements() {
return true;
}
/**
* Retrieve the Connection via WebLogic's <code>getVendorConnection</code> method.
*/
protected Connection doGetNativeConnection(Connection con) throws SQLException {
if (this.jdbcExtensionClass.isAssignableFrom(con.getClass())) {
return (Connection) ReflectionUtils.invokeJdbcMethod(this.getVendorConnectionMethod, con);
}
return con;
}
}