bridges/source/jni_uno/jni_helper.h

   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 <sal/config.h>
  23
  24 #include <memory>
  25
  26 #include "jni_base.h"
  27 #include "jni_info.h"
  28
  29
  30 namespace jni_uno
  31 {
  32
  33 inline void jstring_to_ustring(
  34     JNI_context const & jni, rtl_uString ** out_ustr, jstring jstr )
  35 {
  36     if (nullptr == jstr)
  37     {
  38         rtl_uString_new( out_ustr );
  39     }
  40     else
  41     {
  42         jsize len = jni->GetStringLength( jstr );
  43         std::unique_ptr< rtl_mem > mem(
  44             rtl_mem::allocate(
  45                 sizeof (rtl_uString) + (len * sizeof (sal_Unicode)) ) );
  46         rtl_uString * ustr = reinterpret_cast<rtl_uString *>(mem.get());
  47         jni->GetStringRegion( jstr, 0, len, reinterpret_cast<jchar *>(ustr->buffer) );
  48         jni.ensure_no_exception();
  49         ustr->refCount = 1;
  50         ustr->length = len;
  51         ustr->buffer[ len ] = '\0';
  52         // coverity[leaked_storage : FALSE] - transfer ownership to *out_ustr
  53         mem.release();
  54         if (nullptr != *out_ustr)
  55             rtl_uString_release( *out_ustr );
  56         *out_ustr = ustr;
  57     }
  58 }
  59
  60 inline OUString jstring_to_oustring(
  61     JNI_context const & jni, jstring jstr )
  62 {
  63     rtl_uString * ustr = nullptr;
  64     jstring_to_ustring( jni, &ustr, jstr );
  65     return OUString( ustr, SAL_NO_ACQUIRE );
  66 }
  67
  68 inline jstring ustring_to_jstring(
  69     JNI_context const & jni, rtl_uString const * ustr )
  70 {
  71     jstring jstr = jni->NewString( reinterpret_cast<jchar const *>(ustr->buffer), ustr->length );
  72     jni.ensure_no_exception();
  73     return jstr;
  74 }
  75
  76
  77 // if inException, does not handle exceptions, in which case returned value will
  78 // be null if exception occurred:
  79 inline jclass find_class(
  80     JNI_context const & jni, char const * class_name, bool inException = false )
  81 {
  82     // find_class may be called before the JNI_info is set:
  83     jclass c=nullptr;
  84     jmethodID m;
  85     JNI_info const * info = jni.get_info();
  86     if (info == nullptr) {
  87         jni.getClassForName(&c, &m);
  88         if (c == nullptr) {
  89             if (inException) {
  90                 return nullptr;
  91             }
  92             jni.ensure_no_exception();
  93         }
  94     } else {
  95         c = info->m_class_Class;
  96         m = info->m_method_Class_forName;
  97     }
  98     return jni.findClass(class_name, c, m, inException);
  99 }
 100
 101
 102 inline jobject create_type( JNI_context const & jni, jclass clazz )
 103 {
 104     JNI_info const * jni_info = jni.get_info();
 105     jvalue arg;
 106     arg.l = clazz;
 107     jobject jo_type = jni->NewObjectA(
 108         jni_info->m_class_Type, jni_info->m_ctor_Type_with_Class, &arg );
 109     jni.ensure_no_exception();
 110     return jo_type;
 111 }
 112
 113 inline jobject create_type(
 114     JNI_context const & jni, typelib_TypeDescriptionReference * type )
 115 {
 116     JNI_info const * jni_info = jni.get_info();
 117     jvalue args[ 2 ];
 118     // get type class
 119     args[ 0 ].i = type->eTypeClass;
 120     JLocalAutoRef jo_type_class(
 121         jni, jni->CallStaticObjectMethodA(
 122             jni_info->m_class_TypeClass,
 123             jni_info->m_method_TypeClass_fromInt, args ) );
 124     jni.ensure_no_exception();
 125     // construct type
 126     JLocalAutoRef jo_type_name(
 127         jni, ustring_to_jstring( jni, type->pTypeName ) );
 128     args[ 0 ].l = jo_type_name.get();
 129     args[ 1 ].l = jo_type_class.get();
 130     jobject jo_type = jni->NewObjectA(
 131         jni_info->m_class_Type,
 132         jni_info->m_ctor_Type_with_Name_TypeClass, args );
 133     jni.ensure_no_exception();
 134     return jo_type;
 135 }
 136
 137 inline jobject compute_oid( JNI_context const & jni, jobject jo )
 138 {
 139     JNI_info const * jni_info = jni.get_info();
 140     jvalue arg;
 141     arg.l= jo;
 142     jobject jo_oid = jni->CallStaticObjectMethodA(
 143         jni_info->m_class_UnoRuntime,
 144         jni_info->m_method_UnoRuntime_generateOid, &arg );
 145     jni.ensure_no_exception();
 146     return jo_oid;
 147 }
 148
 149 }
 150
 151 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */