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      1 /*
      2  * Copyright 2006, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15 */
     16 
     17 #include <ui/KeyCharacterMap.h>
     18 #include <ui/Input.h>
     19 
     20 #include <android_runtime/AndroidRuntime.h>
     21 #include <nativehelper/jni.h>
     22 #include <nativehelper/JNIHelp.h>
     23 
     24 #include "android_view_KeyEvent.h"
     25 
     26 namespace android {
     27 
     28 static struct {
     29     jclass clazz;
     30 } gKeyEventClassInfo;
     31 
     32 static struct {
     33     jfieldID keyCode;
     34     jfieldID metaState;
     35 } gFallbackActionClassInfo;
     36 
     37 
     38 static jint nativeLoad(JNIEnv *env, jobject clazz, jint deviceId) {
     39     KeyCharacterMap* map;
     40     status_t status = KeyCharacterMap::loadByDeviceId(deviceId, &map);
     41     if (status) {
     42         String8 msg;
     43         msg.appendFormat("Could not load key character map for device %d due to error %d.  "
     44                 "Refer to the log for details.", deviceId, status);
     45         jniThrowException(env, "android/view/KeyCharacterMap$KeyCharacterMapUnavailableException",
     46                 msg.string());
     47         return 0;
     48     }
     49     return reinterpret_cast<jint>(map);
     50 }
     51 
     52 static void nativeDispose(JNIEnv *env, jobject clazz, jint ptr) {
     53     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
     54     delete map;
     55 }
     56 
     57 static jchar nativeGetCharacter(JNIEnv *env, jobject clazz, jint ptr,
     58         jint keyCode, jint metaState) {
     59     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
     60     return map->getCharacter(keyCode, metaState);
     61 }
     62 
     63 static jboolean nativeGetFallbackAction(JNIEnv *env, jobject clazz, jint ptr, jint keyCode,
     64         jint metaState, jobject fallbackActionObj) {
     65     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
     66     KeyCharacterMap::FallbackAction fallbackAction;
     67 
     68     bool result = map->getFallbackAction(keyCode, metaState, &fallbackAction);
     69     if (result) {
     70         env->SetIntField(fallbackActionObj, gFallbackActionClassInfo.keyCode,
     71                 fallbackAction.keyCode);
     72         env->SetIntField(fallbackActionObj, gFallbackActionClassInfo.metaState,
     73                 fallbackAction.metaState);
     74     }
     75     return result;
     76 }
     77 
     78 static jchar nativeGetNumber(JNIEnv *env, jobject clazz, jint ptr, jint keyCode) {
     79     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
     80     return map->getNumber(keyCode);
     81 }
     82 
     83 static jchar nativeGetMatch(JNIEnv *env, jobject clazz, jint ptr, jint keyCode,
     84         jcharArray charsArray, jint metaState) {
     85     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
     86 
     87     jsize numChars = env->GetArrayLength(charsArray);
     88     jchar* chars = static_cast<jchar*>(env->GetPrimitiveArrayCritical(charsArray, NULL));
     89     if (!chars) {
     90         return 0;
     91     }
     92 
     93     char16_t result = map->getMatch(keyCode, chars, size_t(numChars), metaState);
     94 
     95     env->ReleasePrimitiveArrayCritical(charsArray, chars, JNI_ABORT);
     96     return result;
     97 }
     98 
     99 static jchar nativeGetDisplayLabel(JNIEnv *env, jobject clazz, jint ptr, jint keyCode) {
    100     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
    101     return map->getDisplayLabel(keyCode);
    102 }
    103 
    104 static jint nativeGetKeyboardType(JNIEnv *env, jobject clazz, jint ptr) {
    105     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
    106     return map->getKeyboardType();
    107 }
    108 
    109 static jobjectArray nativeGetEvents(JNIEnv *env, jobject clazz, jint ptr, jint deviceId,
    110         jcharArray charsArray) {
    111     KeyCharacterMap* map = reinterpret_cast<KeyCharacterMap*>(ptr);
    112 
    113     jchar* chars = env->GetCharArrayElements(charsArray, NULL);
    114     if (!chars) {
    115         return NULL;
    116     }
    117     jsize numChars = env->GetArrayLength(charsArray);
    118 
    119     Vector<KeyEvent> events;
    120     jobjectArray result = NULL;
    121     if (map->getEvents(deviceId, chars, size_t(numChars), events)) {
    122         result = env->NewObjectArray(jsize(events.size()), gKeyEventClassInfo.clazz, NULL);
    123         if (result) {
    124             for (size_t i = 0; i < events.size(); i++) {
    125                 jobject keyEventObj = android_view_KeyEvent_fromNative(env, &events.itemAt(i));
    126                 if (!keyEventObj) break; // threw OOM exception
    127                 env->SetObjectArrayElement(result, jsize(i), keyEventObj);
    128                 env->DeleteLocalRef(keyEventObj);
    129             }
    130         }
    131     }
    132 
    133     env->ReleaseCharArrayElements(charsArray, chars, JNI_ABORT);
    134     return result;
    135 }
    136 
    137 
    138 /*
    139  * JNI registration.
    140  */
    141 
    142 static JNINativeMethod g_methods[] = {
    143     /* name, signature, funcPtr */
    144     { "nativeLoad", "(I)I",
    145             (void*)nativeLoad },
    146     { "nativeDispose", "(I)V",
    147             (void*)nativeDispose },
    148     { "nativeGetCharacter", "(III)C",
    149             (void*)nativeGetCharacter },
    150     { "nativeGetFallbackAction", "(IIILandroid/view/KeyCharacterMap$FallbackAction;)Z",
    151             (void*)nativeGetFallbackAction },
    152     { "nativeGetNumber", "(II)C",
    153             (void*)nativeGetNumber },
    154     { "nativeGetMatch", "(II[CI)C",
    155             (void*)nativeGetMatch },
    156     { "nativeGetDisplayLabel", "(II)C",
    157             (void*)nativeGetDisplayLabel },
    158     { "nativeGetKeyboardType", "(I)I",
    159             (void*)nativeGetKeyboardType },
    160     { "nativeGetEvents", "(II[C)[Landroid/view/KeyEvent;",
    161             (void*)nativeGetEvents },
    162 };
    163 
    164 #define FIND_CLASS(var, className) \
    165         var = env->FindClass(className); \
    166         LOG_FATAL_IF(! var, "Unable to find class " className);
    167 
    168 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
    169         var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
    170         LOG_FATAL_IF(! var, "Unable to find field " fieldName);
    171 
    172 int register_android_text_KeyCharacterMap(JNIEnv* env)
    173 {
    174     FIND_CLASS(gKeyEventClassInfo.clazz, "android/view/KeyEvent");
    175     gKeyEventClassInfo.clazz = jclass(env->NewGlobalRef(gKeyEventClassInfo.clazz));
    176 
    177     jclass clazz;
    178     FIND_CLASS(clazz, "android/view/KeyCharacterMap$FallbackAction");
    179 
    180     GET_FIELD_ID(gFallbackActionClassInfo.keyCode, clazz,
    181             "keyCode", "I");
    182 
    183     GET_FIELD_ID(gFallbackActionClassInfo.metaState, clazz,
    184             "metaState", "I");
    185 
    186     return AndroidRuntime::registerNativeMethods(env,
    187             "android/view/KeyCharacterMap", g_methods, NELEM(g_methods));
    188 }
    189 
    190 }; // namespace android
    191