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      1 /*
      2  * Copyright (C) 2014 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 #define LOG_TAG "StaticLayout"
     18 
     19 #include "ScopedIcuLocale.h"
     20 #include "unicode/locid.h"
     21 #include "unicode/brkiter.h"
     22 #include "utils/misc.h"
     23 #include "utils/Log.h"
     24 #include "ScopedPrimitiveArray.h"
     25 #include "JNIHelp.h"
     26 #include <android_runtime/AndroidRuntime.h>
     27 #include <vector>
     28 
     29 namespace android {
     30 
     31 class ScopedBreakIterator {
     32     public:
     33         ScopedBreakIterator(JNIEnv* env, BreakIterator* breakIterator, jcharArray inputText,
     34                             jint length) : mBreakIterator(breakIterator), mChars(env, inputText) {
     35             UErrorCode status = U_ZERO_ERROR;
     36             mUText = utext_openUChars(NULL, mChars.get(), length, &status);
     37             if (mUText == NULL) {
     38                 return;
     39             }
     40 
     41             mBreakIterator->setText(mUText, status);
     42         }
     43 
     44         inline BreakIterator* operator->() {
     45             return mBreakIterator;
     46         }
     47 
     48         ~ScopedBreakIterator() {
     49             utext_close(mUText);
     50             delete mBreakIterator;
     51         }
     52     private:
     53         BreakIterator* mBreakIterator;
     54         ScopedCharArrayRO mChars;
     55         UText* mUText;
     56 
     57         // disable copying and assignment
     58         ScopedBreakIterator(const ScopedBreakIterator&);
     59         void operator=(const ScopedBreakIterator&);
     60 };
     61 
     62 static jintArray nLineBreakOpportunities(JNIEnv* env, jclass, jstring javaLocaleName,
     63                                         jcharArray inputText, jint length,
     64                                         jintArray recycle) {
     65     jintArray ret;
     66     std::vector<jint> breaks;
     67 
     68     ScopedIcuLocale icuLocale(env, javaLocaleName);
     69     if (icuLocale.valid()) {
     70         UErrorCode status = U_ZERO_ERROR;
     71         BreakIterator* it = BreakIterator::createLineInstance(icuLocale.locale(), status);
     72         if (!U_SUCCESS(status) || it == NULL) {
     73             if (it) {
     74                 delete it;
     75             }
     76         } else {
     77             ScopedBreakIterator breakIterator(env, it, inputText, length);
     78             for (int loc = breakIterator->first(); loc != BreakIterator::DONE;
     79                     loc = breakIterator->next()) {
     80                 breaks.push_back(loc);
     81             }
     82         }
     83     }
     84 
     85     breaks.push_back(-1); // sentinel terminal value
     86 
     87     if (recycle != NULL && static_cast<size_t>(env->GetArrayLength(recycle)) >= breaks.size()) {
     88         ret = recycle;
     89     } else {
     90         ret = env->NewIntArray(breaks.size());
     91     }
     92 
     93     if (ret != NULL) {
     94         env->SetIntArrayRegion(ret, 0, breaks.size(), &breaks.front());
     95     }
     96 
     97     return ret;
     98 }
     99 
    100 static JNINativeMethod gMethods[] = {
    101     {"nLineBreakOpportunities", "(Ljava/lang/String;[CI[I)[I", (void*) nLineBreakOpportunities}
    102 };
    103 
    104 int register_android_text_StaticLayout(JNIEnv* env)
    105 {
    106     return AndroidRuntime::registerNativeMethods(env, "android/text/StaticLayout",
    107             gMethods, NELEM(gMethods));
    108 }
    109 
    110 }
    111