connectivity/source/inc/java/ContextClassLoader.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <java/GlobalRef.hxx>
  23
  24 namespace comphelper
  25 {
  26     class EventLogger;
  27 }
  28
  29
  30 namespace connectivity::jdbc
  31 {
  32     class ContextClassLoaderScope
  33     {
  34     public:
  35         /** creates the instance. If isActive returns <FALSE/> afterwards, then an exception
  36             happened in the JVM, which should be raised as UNO exception by the caller
  37
  38             @param  environment
  39                 the current JNI environment
  40             @param  newClassLoader
  41                 the new class loader to set at the current thread
  42             @param  _rLoggerForErrors
  43                 the logger which should be passed to java_lang_object::ThrowLoggedSQLException in case
  44                 an error occurs
  45             @param  _rxErrorContext
  46                 the context which should be passed to java_lang_object::ThrowLoggedSQLException in case
  47                 an error occurs
  48
  49         */
  50         ContextClassLoaderScope(
  51             JNIEnv& environment,
  52             const GlobalRef< jobject >& newClassLoader,
  53             const ::comphelper::EventLogger& _rLoggerForErrors,
  54             const css::uno::Reference< css::uno::XInterface >& _rxErrorContext
  55         );
  56
  57         ~ContextClassLoaderScope();
  58
  59         bool isActive() const
  60         {
  61             return  ( m_currentThread.is() )
  62                 &&  ( m_setContextClassLoaderMethod != nullptr );
  63         }
  64
  65     private:
  66         ContextClassLoaderScope(ContextClassLoaderScope const &) = delete;
  67         ContextClassLoaderScope& operator =(ContextClassLoaderScope const &) = delete;
  68
  69         JNIEnv&                             m_environment;
  70         LocalRef< jobject >                 m_currentThread;
  71         LocalRef< jobject >                 m_oldContextClassLoader;
  72         jmethodID                           m_setContextClassLoaderMethod;
  73     };
  74
  75
  76 } // namespace connectivity::jdbc
  77
  78
  79 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */