Home | History | Annotate | Download | only in jni 
      1  // Copyright (c) 2010 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "android/jni/jni_utils.h"
      6 #include "base/logging.h"
      7 #include "base/utf_string_conversions.h"
      8 #include "jni.h"
      9 
     10 namespace {
     11 JavaVM* sVM = NULL;
     12 
     13 JavaVM* getJavaVM() {
     14   return sVM;
     15 }
     16 }
     17 
     18 namespace android {
     19 namespace jni {
     20 
     21 // All JNI code assumes this has previously been called with a valid VM
     22 void SetJavaVM(JavaVM* vm)
     23 {
     24   sVM = vm;
     25 }
     26 
     27 bool checkException(JNIEnv* env)
     28 {
     29   if (env->ExceptionCheck() != 0)
     30   {
     31     LOG(ERROR) << "*** Uncaught exception returned from Java call!\n";
     32     env->ExceptionDescribe();
     33     return true;
     34   }
     35   return false;
     36 }
     37 
     38 string16 jstringToString16(JNIEnv* env, jstring jstr)
     39 {
     40   if (!jstr || !env)
     41     return string16();
     42 
     43   const char* s = env->GetStringUTFChars(jstr, 0);
     44   if (!s)
     45     return string16();
     46   string16 str = UTF8ToUTF16(s);
     47   env->ReleaseStringUTFChars(jstr, s);
     48   checkException(env);
     49   return str;
     50 }
     51 
     52 std::string jstringToStdString(JNIEnv* env, jstring jstr)
     53 {
     54   if (!jstr || !env)
     55     return std::string();
     56 
     57   const char* s = env->GetStringUTFChars(jstr, 0);
     58   if (!s)
     59     return std::string();
     60   std::string str(s);
     61   env->ReleaseStringUTFChars(jstr, s);
     62   checkException(env);
     63   return str;
     64 }
     65 
     66 JNIEnv* GetJNIEnv() {
     67   JNIEnv* env;
     68   getJavaVM()->AttachCurrentThread(&env, NULL);
     69   return env;
     70 }
     71 
     72 std::string JstringToStdString(JNIEnv* env, jstring jstr) {
     73   return jstringToStdString(env, jstr);
     74 }
     75 
     76 string16 JstringToString16(JNIEnv* env, jstring jstr)
     77 {
     78     return jstringToString16(env, jstr);
     79 }
     80 
     81 bool CheckException(JNIEnv* env)
     82 {
     83     return checkException(env);
     84 }
     85 
     86 jstring ConvertUTF8ToJavaString(JNIEnv* env, std::string str)
     87 {
     88     return env->NewStringUTF(str.c_str());
     89 }
     90 
     91 void DetachFromVM()
     92 {
     93     JavaVM* vm = getJavaVM();
     94     vm->DetachCurrentThread();
     95 }
     96 
     97 } // namespace jni
     98 } // namespace android
     99 
    100