ContextClassLoader.cxx

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#include <java/ContextClassLoader.hxx>
#include <java/lang/Object.hxx>
 
 
namespace connectivity::jdbc
{
 
 
    using ::com::sun::star::uno::Reference;
    using ::com::sun::star::uno::XInterface;
 
    using ::connectivity::java_lang_Object;
 
    ContextClassLoaderScope::ContextClassLoaderScope( JNIEnv& environment, const GlobalRef< jobject >& newClassLoader,
        const ::comphelper::EventLogger& _rLoggerForErrors, const Reference< XInterface >& _rxErrorContext )
        :m_environment( environment )
        ,m_currentThread( environment )
        ,m_oldContextClassLoader( environment )
        ,m_setContextClassLoaderMethod( nullptr )
    {
        if ( !newClassLoader.is() )
            return;
 
        do  // artificial loop for easier flow control
        {
 
            LocalRef< jclass > threadClass( m_environment );
            threadClass.set( m_environment.FindClass( "java/lang/Thread" ) );
            if ( !threadClass.is() )
                break;
 
            jmethodID currentThreadMethod( m_environment.GetStaticMethodID(
                threadClass.get(), "currentThread", "()Ljava/lang/Thread;" ) );
            if ( currentThreadMethod == nullptr )
                break;
 
            m_currentThread.set( m_environment.CallStaticObjectMethod( threadClass.get(), currentThreadMethod ) );
            if ( !m_currentThread.is() )
                break;
 
            jmethodID getContextClassLoaderMethod( m_environment.GetMethodID(
                threadClass.get(), "getContextClassLoader", "()Ljava/lang/ClassLoader;" ) );
            if ( getContextClassLoaderMethod == nullptr )
                break;
            m_oldContextClassLoader.set( m_environment.CallObjectMethod( m_currentThread.get(), getContextClassLoaderMethod ) );
            LocalRef< jthrowable > throwable( m_environment, m_environment.ExceptionOccurred() );
            if ( throwable.is() )
                break;
 
            m_setContextClassLoaderMethod = m_environment.GetMethodID(
                threadClass.get(), "setContextClassLoader", "(Ljava/lang/ClassLoader;)V" );
            if ( m_setContextClassLoaderMethod == nullptr )
                break;
 
        }
        while ( false );
 
        if ( !isActive() )
        {
            java_lang_Object::ThrowLoggedSQLException( _rLoggerForErrors, &environment, _rxErrorContext );
            return;
        }
 
        // set the new class loader
        m_environment.CallObjectMethod( m_currentThread.get(), m_setContextClassLoaderMethod, newClassLoader.get() );
        LocalRef< jthrowable > throwable( m_environment, m_environment.ExceptionOccurred() );
        if ( throwable.is() )
        {
            m_currentThread.reset();
            m_setContextClassLoaderMethod = nullptr;
            java_lang_Object::ThrowLoggedSQLException( _rLoggerForErrors, &environment, _rxErrorContext );
        }
    }
 
 
    ContextClassLoaderScope::~ContextClassLoaderScope()
    {
        if ( isActive() )
        {
            LocalRef< jobject > currentThread( m_currentThread.env(), m_currentThread.release() );
            jmethodID setContextClassLoaderMethod( m_setContextClassLoaderMethod );
            m_setContextClassLoaderMethod = nullptr;
 
            m_environment.CallObjectMethod( currentThread.get(), setContextClassLoaderMethod, m_oldContextClassLoader.get() );
            m_environment.ExceptionClear();
        }
    }
 
} // namespace connectivity::jdbc
 
 
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