/*
* 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 WebSphere,
* supporting WebSphere Application Server 5.1 and higher.
*
* <p>Returns the underlying native Connection to application code instead
* of WebSphere'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 WebSphere DataSource: If a given object is not a WebSphere
* Connection wrapper, it will be returned as-is.
*
* @author Juergen Hoeller
* @since 1.1
* @see com.ibm.ws.rsadapter.jdbc.WSJdbcConnection
* @see com.ibm.ws.rsadapter.jdbc.WSJdbcUtil#getNativeConnection
*/
public class WebSphereNativeJdbcExtractor extends NativeJdbcExtractorAdapter {
private static final String JDBC_ADAPTER_CONNECTION_NAME_5 = "com.ibm.ws.rsadapter.jdbc.WSJdbcConnection";
private static final String JDBC_ADAPTER_UTIL_NAME_5 = "com.ibm.ws.rsadapter.jdbc.WSJdbcUtil";
private Class webSphere5ConnectionClass;
private Method webSphere5NativeConnectionMethod;
/**
* This constructor retrieves WebSphere JDBC adapter classes,
* so we can get the underlying vendor connection using reflection.
*/
public WebSphereNativeJdbcExtractor() {
try {
this.webSphere5ConnectionClass = getClass().getClassLoader().loadClass(JDBC_ADAPTER_CONNECTION_NAME_5);
Class jdbcAdapterUtilClass = getClass().getClassLoader().loadClass(JDBC_ADAPTER_UTIL_NAME_5);
this.webSphere5NativeConnectionMethod =
jdbcAdapterUtilClass.getMethod("getNativeConnection", new Class[] {this.webSphere5ConnectionClass});
}
catch (Exception ex) {
throw new IllegalStateException(
"Could not initialize WebSphereNativeJdbcExtractor because WebSphere API classes are not available: " + ex);
}
}
/**
* Return <code>true</code>, as WebSphere returns wrapped Statements.
*/
public boolean isNativeConnectionNecessaryForNativeStatements() {
return true;
}
/**
* Return <code>true</code>, as WebSphere returns wrapped PreparedStatements.
*/
public boolean isNativeConnectionNecessaryForNativePreparedStatements() {
return true;
}
/**
* Return <code>true</code>, as WebSphere returns wrapped CallableStatements.
*/
public boolean isNativeConnectionNecessaryForNativeCallableStatements() {
return true;
}
/**
* Retrieve the Connection via WebSphere's <code>getNativeConnection</code> method.
*/
protected Connection doGetNativeConnection(Connection con) throws SQLException {
if (this.webSphere5ConnectionClass.isAssignableFrom(con.getClass())) {
return (Connection) ReflectionUtils.invokeJdbcMethod(
this.webSphere5NativeConnectionMethod, null, new Object[] {con});
}
return con;
}
}