WebLogicNativeJdbcExtractor


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.jdbc.support.nativejdbc;
18  
19  import java.lang.reflect.Method  ;
20  import java.sql.Connection  ;
21  import java.sql.SQLException  ;
22  
23  import org.springframework.util.ReflectionUtils;
24  
25  /**
26   * Implementation of the NativeJdbcExtractor interface for WebLogic Server
27   * 6.1+.
28   *
29   * <p>Returns the underlying native Connection to application code instead
30   * of WebLogic's wrapper implementation; unwraps the Connection for native
31   * statements. The returned JDBC classes can then safely be cast, e.g. to
32   * <code>oracle.jdbc.OracleConnection</code>.
33   *
34   * <p>This NativeJdbcExtractor can be set just to <i>allow</i> working
35   * with a WebLogic DataSource: If a given object is not a WebLogic
36   * Connection wrapper, it will be returned as-is.
37   *
38   * @author Thomas Risberg
39   * @author Juergen Hoeller
40   * @since 1.0.2
41   * @see #getNativeConnection
42   * @see weblogic.jdbc.extensions.WLConnection#getVendorConnection
43   */
44  public class WebLogicNativeJdbcExtractor extends NativeJdbcExtractorAdapter {
45  
46      private static final String   JDBC_EXTENSION_NAME = "weblogic.jdbc.extensions.WLConnection";
47  
48  
49      private final Class   jdbcExtensionClass;
50  
51      private final Method   getVendorConnectionMethod;
52  
53  
54      /**
55       * This constructor retrieves the WebLogic JDBC extension interface,
56       * so we can get the underlying vendor connection using reflection.
57       */
58      public WebLogicNativeJdbcExtractor() {
59          try {
60              this.jdbcExtensionClass = getClass().getClassLoader().loadClass(JDBC_EXTENSION_NAME);
61              this.getVendorConnectionMethod = this.jdbcExtensionClass.getMethod("getVendorConnection", (Class  []) null);
62          }
63          catch (Exception   ex) {
64              throw new IllegalStateException  (
65                      "Could not initialize WebLogicNativeJdbcExtractor because WebLogic API classes are not available: " + ex);
66          }
67      }
68  
69  
70      /**
71       * Return <code>true</code>, as WebLogic returns wrapped Statements.
72       */
73      public boolean isNativeConnectionNecessaryForNativeStatements() {
74          return true;
75      }
76  
77      /**
78       * Return <code>true</code>, as WebLogic returns wrapped PreparedStatements.
79       */
80      public boolean isNativeConnectionNecessaryForNativePreparedStatements() {
81          return true;
82      }
83  
84      /**
85       * Return <code>true</code>, as WebLogic returns wrapped CallableStatements.
86       */
87      public boolean isNativeConnectionNecessaryForNativeCallableStatements() {
88          return true;
89      }
90  
91      /**
92       * Retrieve the Connection via WebLogic's <code>getVendorConnection</code> method.
93       */
94      protected Connection   doGetNativeConnection(Connection   con) throws SQLException   {
95          if (this.jdbcExtensionClass.isAssignableFrom(con.getClass())) {
96              return (Connection  ) ReflectionUtils.invokeMethod(this.getVendorConnectionMethod, con);
97          }
98          return con;
99      }
100 
101 }
102
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