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/*
**
** Copyright 2009, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#define LOG_TAG "BinaryDictionary"
#include "utils/Log.h"
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <nativehelper/jni.h>
#include "utils/AssetManager.h"
#include "utils/Asset.h"
#include "dictionary.h"
// ----------------------------------------------------------------------------
using namespace latinime;
using namespace android;
static jfieldID sDescriptorField;
static jfieldID sAssetManagerNativeField;
static jmethodID sAddWordMethod;
//
// helper function to throw an exception
//
static void throwException(JNIEnv *env, const char* ex, const char* fmt, int data)
{
if (jclass cls = env->FindClass(ex)) {
char msg[1000];
sprintf(msg, fmt, data);
env->ThrowNew(cls, msg);
env->DeleteLocalRef(cls);
}
}
static jint latinime_BinaryDictionary_open
(JNIEnv *env, jobject object, jobject assetManager, jstring resourceString,
jint typedLetterMultiplier, jint fullWordMultiplier)
{
// Get the native file descriptor from the FileDescriptor object
AssetManager *am = (AssetManager*) env->GetIntField(assetManager, sAssetManagerNativeField);
if (!am) {
LOGE("DICT: Couldn't get AssetManager native peer\n");
return 0;
}
const char *resourcePath = env->GetStringUTFChars(resourceString, NULL);
Asset *dictAsset = am->openNonAsset(resourcePath, Asset::ACCESS_BUFFER);
if (dictAsset == NULL) {
LOGE("DICT: Couldn't get asset %s\n", resourcePath);
env->ReleaseStringUTFChars(resourceString, resourcePath);
return 0;
}
void *dict = (void*) dictAsset->getBuffer(false);
if (dict == NULL) {
LOGE("DICT: Dictionary buffer is null\n");
env->ReleaseStringUTFChars(resourceString, resourcePath);
return 0;
}
Dictionary *dictionary = new Dictionary(dict, typedLetterMultiplier, fullWordMultiplier);
dictionary->setAsset(dictAsset);
env->ReleaseStringUTFChars(resourceString, resourcePath);
return (jint) dictionary;
}
static int latinime_BinaryDictionary_getSuggestions(
JNIEnv *env, jobject object, jint dict, jintArray inputArray, jint arraySize,
jcharArray outputArray, jintArray frequencyArray, jint maxWordLength, jint maxWords,
jint maxAlternatives)
{
Dictionary *dictionary = (Dictionary*) dict;
if (dictionary == NULL)
return 0;
int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
jchar *outputChars = env->GetCharArrayElements(outputArray, NULL);
int count = dictionary->getSuggestions(inputCodes, arraySize, (unsigned short*) outputChars, frequencies,
maxWordLength, maxWords, maxAlternatives);
env->ReleaseIntArrayElements(frequencyArray, frequencies, JNI_COMMIT);
env->ReleaseIntArrayElements(inputArray, inputCodes, JNI_ABORT);
env->ReleaseCharArrayElements(outputArray, outputChars, JNI_COMMIT);
return count;
}
static jboolean latinime_BinaryDictionary_isValidWord
(JNIEnv *env, jobject object, jint dict, jcharArray wordArray, jint wordLength)
{
Dictionary *dictionary = (Dictionary*) dict;
if (dictionary == NULL) return (jboolean) false;
jchar *word = env->GetCharArrayElements(wordArray, NULL);
jboolean result = dictionary->isValidWord((unsigned short*) word, wordLength);
env->ReleaseCharArrayElements(wordArray, word, JNI_ABORT);
return result;
}
static void latinime_BinaryDictionary_close
(JNIEnv *env, jobject object, jint dict)
{
Dictionary *dictionary = (Dictionary*) dict;
((Asset*) dictionary->getAsset())->close();
delete (Dictionary*) dict;
}
// ----------------------------------------------------------------------------
static JNINativeMethod gMethods[] = {
{"openNative", "(Landroid/content/res/AssetManager;Ljava/lang/String;II)I",
(void*)latinime_BinaryDictionary_open},
{"closeNative", "(I)V", (void*)latinime_BinaryDictionary_close},
{"getSuggestionsNative", "(I[II[C[IIII)I", (void*)latinime_BinaryDictionary_getSuggestions},
{"isValidWordNative", "(I[CI)Z", (void*)latinime_BinaryDictionary_isValidWord}
};
static int registerNativeMethods(JNIEnv* env, const char* className,
JNINativeMethod* gMethods, int numMethods)
{
jclass clazz;
clazz = env->FindClass(className);
if (clazz == NULL) {
fprintf(stderr,
"Native registration unable to find class '%s'\n", className);
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
fprintf(stderr, "RegisterNatives failed for '%s'\n", className);
return JNI_FALSE;
}
return JNI_TRUE;
}
static int registerNatives(JNIEnv *env)
{
const char* const kClassPathName = "com/android/inputmethod/latin/BinaryDictionary";
jclass clazz;
clazz = env->FindClass("java/io/FileDescriptor");
if (clazz == NULL) {
LOGE("Can't find %s", "java/io/FileDescriptor");
return -1;
}
sDescriptorField = env->GetFieldID(clazz, "descriptor", "I");
clazz = env->FindClass("android/content/res/AssetManager");
if (clazz == NULL) {
LOGE("Can't find %s", "java/io/FileDescriptor");
return -1;
}
sAssetManagerNativeField = env->GetFieldID(clazz, "mObject", "I");
return registerNativeMethods(env,
kClassPathName, gMethods, sizeof(gMethods) / sizeof(gMethods[0]));
}
/*
* Returns the JNI version on success, -1 on failure.
*/
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
JNIEnv* env = NULL;
jint result = -1;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
fprintf(stderr, "ERROR: GetEnv failed\n");
goto bail;
}
assert(env != NULL);
if (!registerNatives(env)) {
fprintf(stderr, "ERROR: BinaryDictionary native registration failed\n");
goto bail;
}
/* success -- return valid version number */
result = JNI_VERSION_1_4;
bail:
return result;
}
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