connectivity/source/drivers/jdbc/ContextClassLoader.cxx

   1 /*************************************************************************
   2  *
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * Copyright 2008 by Sun Microsystems, Inc.
   6  *
   7  * OpenOffice.org - a multi-platform office productivity suite
   8  *
   9  * $RCSfile: ContextClassLoader.cxx,v $
  10  * $Revision: 1.3 $
  11  *
  12  * This file is part of OpenOffice.org.
  13  *
  14  * OpenOffice.org is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU Lesser General Public License version 3
  16  * only, as published by the Free Software Foundation.
  17  *
  18  * OpenOffice.org is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU Lesser General Public License version 3 for more details
  22  * (a copy is included in the LICENSE file that accompanied this code).
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * version 3 along with OpenOffice.org.  If not, see
  26  * <http://www.openoffice.org/license.html>
  27  * for a copy of the LGPLv3 License.
  28  *
  29  ************************************************************************/
  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_connectivity.hxx"
  33
  34 #include "java/ContextClassLoader.hxx"
  35 #include "java/lang/Object.hxx"
  36
  37 /** === begin UNO includes === **/
  38 /** === end UNO includes === **/
  39
  40 //........................................................................
  41 namespace connectivity { namespace jdbc
  42 {
  43 //........................................................................
  44
  45     /** === begin UNO using === **/
  46     using ::com::sun::star::uno::Reference;
  47     using ::com::sun::star::uno::XInterface;
  48     /** === end UNO using === **/
  49
  50     using ::connectivity::java_lang_Object;
  51
  52     //====================================================================
  53     //= ContextClassLoaderScope
  54     //====================================================================
  55     //--------------------------------------------------------------------
  56     ContextClassLoaderScope::ContextClassLoaderScope( JNIEnv& environment, const GlobalRef< jobject >& newClassLoader,
  57         const ::comphelper::ResourceBasedEventLogger& _rLoggerForErrors, const Reference< XInterface >& _rxErrorContext )
  58         :m_environment( environment )
  59         ,m_currentThread( environment )
  60         ,m_oldContextClassLoader( environment )
  61     {
  62         if ( !newClassLoader.is() )
  63             return;
  64
  65         do  // artificial loop for easier flow control
  66         {
  67
  68         LocalRef< jclass > threadClass( m_environment );
  69         threadClass.set( m_environment.FindClass( "java/lang/Thread" ) );
  70         if ( !threadClass.is() )
  71             break;
  72
  73         jmethodID currentThreadMethod( m_environment.GetStaticMethodID(
  74             threadClass.get(), "currentThread", "()Ljava/lang/Thread;" ) );
  75         if ( currentThreadMethod == NULL )
  76             break;
  77
  78         m_currentThread.set( m_environment.CallStaticObjectMethod( threadClass.get(), currentThreadMethod ) );
  79         if ( !m_currentThread.is() )
  80             break;
  81
  82         jmethodID getContextClassLoaderMethod( m_environment.GetMethodID(
  83             threadClass.get(), "getContextClassLoader", "()Ljava/lang/ClassLoader;" ) );
  84         if ( getContextClassLoaderMethod == NULL )
  85             break;
  86         m_oldContextClassLoader.set( m_environment.CallObjectMethod( m_currentThread.get(), getContextClassLoaderMethod ) );
  87         LocalRef< jthrowable > throwable( m_environment, m_environment.ExceptionOccurred() );
  88         if ( throwable.is() )
  89             break;
  90
  91         m_setContextClassLoaderMethod = m_environment.GetMethodID(
  92             threadClass.get(), "setContextClassLoader", "(Ljava/lang/ClassLoader;)V" );
  93         if ( m_setContextClassLoaderMethod == NULL )
  94             break;
  95
  96         }
  97         while ( false );
  98
  99         if ( !isActive() )
 100         {
 101             java_lang_Object::ThrowLoggedSQLException( _rLoggerForErrors, &environment, _rxErrorContext );
 102             return;
 103         }
 104
 105         // set the new class loader
 106         m_environment.CallObjectMethod( m_currentThread.get(), m_setContextClassLoaderMethod, newClassLoader.get() );
 107         LocalRef< jthrowable > throwable( m_environment, m_environment.ExceptionOccurred() );
 108         if ( throwable.is() )
 109         {
 110             m_currentThread.reset();
 111             m_setContextClassLoaderMethod = NULL;
 112             java_lang_Object::ThrowLoggedSQLException( _rLoggerForErrors, &environment, _rxErrorContext );
 113         }
 114     }
 115
 116     //--------------------------------------------------------------------
 117     void ContextClassLoaderScope::pop( bool clearExceptions )
 118     {
 119         if ( isActive() )
 120         {
 121             LocalRef< jobject > currentThread( m_currentThread.env(), m_currentThread.release() );
 122             jmethodID setContextClassLoaderMethod( m_setContextClassLoaderMethod );
 123             m_setContextClassLoaderMethod = NULL;
 124
 125             m_environment.CallObjectMethod( currentThread.get(), setContextClassLoaderMethod, m_oldContextClassLoader.get() );
 126             if ( clearExceptions )
 127             {
 128                 m_environment.ExceptionClear();
 129             }
 130         }
 131     }
 132 //........................................................................
 133 } } // namespace connectivity::jdbc
 134 //........................................................................