javaunohelper/source/preload.cxx

   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 #include "sal/config.h"
  21
  22 #include "jni.h"
  23
  24 #include "rtl/ustring.hxx"
  25 #include "osl/module.hxx"
  26
  27 #include "juhx-export-types.hxx"
  28
  29 // In retrospect, the reason to create a juh wrapper around the juhx library was
  30 // probably because java.lang.System.loadLibrary uses RTLD_LOCAL, so uniqueness
  31 // of GCC RTTI symbols needed for exception handling would not be guaranteed.
  32
  33 #if ! defined SAL_DLLPREFIX
  34 #define SAL_DLLPREFIX ""
  35 #endif
  36
  37
  38 extern "C"
  39 {
  40
  41 static javaunohelper::detail::Func_writeInfo * s_writeInfo;
  42 static javaunohelper::detail::Func_getFactory * s_getFactory;
  43 static javaunohelper::detail::Func_bootstrap * s_bootstrap;
  44 static bool s_inited = false;
  45
  46 extern "C" { static void SAL_CALL thisModule() {} }
  47
  48
  49 static bool inited_juhx( JNIEnv * jni_env )
  50 {
  51     if (s_inited)
  52         return true;
  53     OUString lib_name = SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION;
  54     osl::Module aModule;
  55     if (!aModule.loadRelative(&thisModule, lib_name, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL))
  56     {
  57         jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  58         jni_env->ThrowNew(
  59             c, "error loading " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  60         return false;
  61     }
  62     else
  63     {
  64         OUString symbol =
  65               "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo";
  66         s_writeInfo = reinterpret_cast<javaunohelper::detail::Func_writeInfo *>(aModule.getFunctionSymbol(symbol));
  67         symbol =
  68             "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory";
  69         s_getFactory = reinterpret_cast<javaunohelper::detail::Func_getFactory *>(aModule.getFunctionSymbol(symbol));
  70         symbol =
  71             "Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap";
  72         s_bootstrap =
  73             reinterpret_cast<javaunohelper::detail::Func_bootstrap *>(aModule.getFunctionSymbol(symbol));
  74
  75         if (0 == s_writeInfo ||
  76             0 == s_getFactory ||
  77             0 == s_bootstrap)
  78         {
  79             jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  80             jni_env->ThrowNew(
  81                 c, "error resolving symbols of " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  82             return false;
  83         }
  84         aModule.release();
  85     }
  86     s_inited = true;
  87     return true;
  88 }
  89
  90
  91 SAL_DLLPUBLIC_EXPORT jboolean JNICALL
  92 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo(
  93     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jobject jSMgr,
  94     jobject jRegKey, jobject loader )
  95 {
  96     if (inited_juhx( pJEnv ))
  97         return (*s_writeInfo)(
  98             pJEnv, jClass, jLibName, jSMgr, jRegKey, loader );
  99     return JNI_FALSE;
 100 }
 101
 102 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 103 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory(
 104     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jstring jImplName,
 105     jobject jSMgr, jobject jRegKey, jobject loader )
 106 {
 107     if (inited_juhx( pJEnv ))
 108         return (*s_getFactory)(
 109             pJEnv, jClass, jLibName, jImplName, jSMgr, jRegKey, loader );
 110     return 0;
 111 }
 112
 113 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 114 Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap(
 115     JNIEnv * jni_env, jclass jClass, jstring juno_rc, jobjectArray jpairs,
 116     jobject loader )
 117 {
 118     if (inited_juhx( jni_env ))
 119         return (*s_bootstrap)( jni_env, jClass, juno_rc, jpairs, loader );
 120     return 0;
 121 }
 122 }
 123
 124 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */