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/*
* Copyright (C) 2006 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 "NativeBreakIterator"
#include "JNIHelp.h"
#include "JniConstants.h"
#include "JniException.h"
#include "ScopedUtfChars.h"
#include "unicode/ubrk.h"
#include "unicode/putil.h"
#include <stdlib.h>
/**
* ICU4C 4.6 doesn't let us update the pointers inside a UBreakIterator to track our char[] as it
* moves around the heap. This class pins the char[] for the lifetime of the
* java.text.BreakIterator. It also holds a global reference to the java.lang.String that owns the
* char[] so that the char[] can't be GCed.
*/
class BreakIteratorPeer {
public:
static BreakIteratorPeer* fromAddress(jint address) {
return reinterpret_cast<BreakIteratorPeer*>(static_cast<uintptr_t>(address));
}
uintptr_t toAddress() {
return reinterpret_cast<uintptr_t>(this);
}
BreakIteratorPeer(UBreakIterator* it) : mIt(it), mString(NULL), mChars(NULL) {
}
void setText(JNIEnv* env, jstring s) {
releaseString(env);
mString = reinterpret_cast<jstring>(env->NewGlobalRef(s));
mChars = env->GetStringChars(mString, NULL);
if (mChars == NULL) {
return;
}
size_t charCount = env->GetStringLength(mString);
UErrorCode status = U_ZERO_ERROR;
ubrk_setText(mIt, mChars, charCount, &status);
maybeThrowIcuException(env, status);
}
BreakIteratorPeer* clone(JNIEnv* env) {
UErrorCode status = U_ZERO_ERROR;
jint bufferSize = U_BRK_SAFECLONE_BUFFERSIZE;
UBreakIterator* it = ubrk_safeClone(mIt, NULL, &bufferSize, &status);
if (maybeThrowIcuException(env, status)) {
return NULL;
}
BreakIteratorPeer* result = new BreakIteratorPeer(it);
if (mString != NULL) {
result->setText(env, mString);
}
return result;
}
void close(JNIEnv* env) {
if (mIt != NULL) {
ubrk_close(mIt);
mIt = NULL;
}
releaseString(env);
}
~BreakIteratorPeer() {
if (mIt != NULL || mString != NULL) {
LOG_ALWAYS_FATAL("BreakIteratorPeer deleted but not closed");
}
}
UBreakIterator* breakIterator() {
return mIt;
}
private:
UBreakIterator* mIt;
jstring mString;
const jchar* mChars;
void releaseString(JNIEnv* env) {
if (mString != NULL) {
env->ReleaseStringChars(mString, mChars);
env->DeleteGlobalRef(mString);
mString = NULL;
}
}
// Disallow copy and assignment.
BreakIteratorPeer(const BreakIteratorPeer&);
void operator=(const BreakIteratorPeer&);
};
static UBreakIterator* breakIterator(jint address) {
return BreakIteratorPeer::fromAddress(address)->breakIterator();
}
static jint makeIterator(JNIEnv* env, jstring locale, UBreakIteratorType type) {
UErrorCode status = U_ZERO_ERROR;
const ScopedUtfChars localeChars(env, locale);
if (localeChars.c_str() == NULL) {
return 0;
}
UBreakIterator* it = ubrk_open(type, localeChars.c_str(), NULL, 0, &status);
if (maybeThrowIcuException(env, status)) {
return 0;
}
return (new BreakIteratorPeer(it))->toAddress();
}
static jint NativeBreakIterator_getCharacterInstanceImpl(JNIEnv* env, jclass, jstring locale) {
return makeIterator(env, locale, UBRK_CHARACTER);
}
static jint NativeBreakIterator_getLineInstanceImpl(JNIEnv* env, jclass, jstring locale) {
return makeIterator(env, locale, UBRK_LINE);
}
static jint NativeBreakIterator_getSentenceInstanceImpl(JNIEnv* env, jclass, jstring locale) {
return makeIterator(env, locale, UBRK_SENTENCE);
}
static jint NativeBreakIterator_getWordInstanceImpl(JNIEnv* env, jclass, jstring locale) {
return makeIterator(env, locale, UBRK_WORD);
}
static void NativeBreakIterator_closeBreakIteratorImpl(JNIEnv* env, jclass, jint address) {
BreakIteratorPeer* peer = BreakIteratorPeer::fromAddress(address);
peer->close(env);
delete peer;
}
static jint NativeBreakIterator_cloneImpl(JNIEnv* env, jclass, jint address) {
return BreakIteratorPeer::fromAddress(address)->clone(env)->toAddress();
}
static void NativeBreakIterator_setTextImpl(JNIEnv* env, jclass, jint address, jstring javaText) {
BreakIteratorPeer* peer = BreakIteratorPeer::fromAddress(address);
peer->setText(env, javaText);
}
static jboolean NativeBreakIterator_isBoundaryImpl(JNIEnv*, jclass, jint address, jint offset) {
return ubrk_isBoundary(breakIterator(address), offset);
}
static jint NativeBreakIterator_nextImpl(JNIEnv*, jclass, jint address, jint n) {
UBreakIterator* bi = breakIterator(address);
if (n < 0) {
while (n++ < -1) {
ubrk_previous(bi);
}
return ubrk_previous(bi);
} else if (n == 0) {
return ubrk_current(bi);
} else {
while (n-- > 1) {
ubrk_next(bi);
}
return ubrk_next(bi);
}
return -1;
}
static jint NativeBreakIterator_precedingImpl(JNIEnv*, jclass, jint address, jint offset) {
return ubrk_preceding(breakIterator(address), offset);
}
static jint NativeBreakIterator_firstImpl(JNIEnv*, jclass, jint address) {
return ubrk_first(breakIterator(address));
}
static jint NativeBreakIterator_followingImpl(JNIEnv*, jclass, jint address, jint offset) {
return ubrk_following(breakIterator(address), offset);
}
static jint NativeBreakIterator_currentImpl(JNIEnv*, jclass, jint address) {
return ubrk_current(breakIterator(address));
}
static jint NativeBreakIterator_previousImpl(JNIEnv*, jclass, jint address) {
return ubrk_previous(breakIterator(address));
}
static jint NativeBreakIterator_lastImpl(JNIEnv*, jclass, jint address) {
return ubrk_last(breakIterator(address));
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(NativeBreakIterator, cloneImpl, "(I)I"),
NATIVE_METHOD(NativeBreakIterator, closeBreakIteratorImpl, "(I)V"),
NATIVE_METHOD(NativeBreakIterator, currentImpl, "(I)I"),
NATIVE_METHOD(NativeBreakIterator, firstImpl, "(I)I"),
NATIVE_METHOD(NativeBreakIterator, followingImpl, "(II)I"),
NATIVE_METHOD(NativeBreakIterator, getCharacterInstanceImpl, "(Ljava/lang/String;)I"),
NATIVE_METHOD(NativeBreakIterator, getLineInstanceImpl, "(Ljava/lang/String;)I"),
NATIVE_METHOD(NativeBreakIterator, getSentenceInstanceImpl, "(Ljava/lang/String;)I"),
NATIVE_METHOD(NativeBreakIterator, getWordInstanceImpl, "(Ljava/lang/String;)I"),
NATIVE_METHOD(NativeBreakIterator, isBoundaryImpl, "(II)Z"),
NATIVE_METHOD(NativeBreakIterator, lastImpl, "(I)I"),
NATIVE_METHOD(NativeBreakIterator, nextImpl, "(II)I"),
NATIVE_METHOD(NativeBreakIterator, precedingImpl, "(II)I"),
NATIVE_METHOD(NativeBreakIterator, previousImpl, "(I)I"),
NATIVE_METHOD(NativeBreakIterator, setTextImpl, "(ILjava/lang/String;)V"),
};
void register_libcore_icu_NativeBreakIterator(JNIEnv* env) {
jniRegisterNativeMethods(env, "libcore/icu/NativeBreakIterator", gMethods, NELEM(gMethods));
}
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