Home | History | Annotate | Download | only in jni 
      1 /* //device/libs/android_runtime/android_text_AndroidBidi.cpp
      2 **
      3 ** Copyright 2010, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #define LOG_TAG "AndroidUnicode"
     19 
     20 #include <jni.h>
     21 #include <android_runtime/AndroidRuntime.h>
     22 #include "utils/misc.h"
     23 #include "utils/Log.h"
     24 #include "unicode/ubidi.h"
     25 
     26 namespace android {
     27 
     28 static void jniThrowException(JNIEnv* env, const char* exc, const char* msg = NULL)
     29 {
     30     jclass excClazz = env->FindClass(exc);
     31     LOG_ASSERT(excClazz, "Unable to find class %s", exc);
     32 
     33     env->ThrowNew(excClazz, msg);
     34 }
     35 
     36 static jint runBidi(JNIEnv* env, jobject obj, jint dir, jcharArray chsArray,
     37                     jbyteArray infoArray, int n, jboolean haveInfo)
     38 {
     39     // Parameters are checked on java side
     40     // Failures from GetXXXArrayElements indicate a serious out-of-memory condition
     41     // that we don't bother to report, we're probably dead anyway.
     42     jint result = 0;
     43     jchar* chs = env->GetCharArrayElements(chsArray, NULL);
     44     if (chs != NULL) {
     45         jbyte* info = env->GetByteArrayElements(infoArray, NULL);
     46         if (info != NULL) {
     47             UErrorCode status = U_ZERO_ERROR;
     48             UBiDi* bidi = ubidi_openSized(n, 0, &status);
     49             ubidi_setPara(bidi, chs, n, dir, NULL, &status);
     50             if (U_SUCCESS(status)) {
     51                 for (int i = 0; i < n; ++i) {
     52                   info[i] = ubidi_getLevelAt(bidi, i);
     53                 }
     54                 result = ubidi_getParaLevel(bidi);
     55             } else {
     56                 jniThrowException(env, "java/lang/RuntimeException", NULL);
     57             }
     58             ubidi_close(bidi);
     59 
     60             env->ReleaseByteArrayElements(infoArray, info, 0);
     61         }
     62         env->ReleaseCharArrayElements(chsArray, chs, JNI_ABORT);
     63     }
     64     return result;
     65 }
     66 
     67 static JNINativeMethod gMethods[] = {
     68         { "runBidi", "(I[C[BIZ)I",
     69         (void*) runBidi }
     70 };
     71 
     72 int register_android_text_AndroidBidi(JNIEnv* env)
     73 {
     74     jclass clazz = env->FindClass("android/text/AndroidBidi");
     75     LOG_ASSERT(clazz, "Cannot find android/text/AndroidBidi");
     76 
     77     return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidBidi",
     78             gMethods, NELEM(gMethods));
     79 }
     80 
     81 }
     82