Home | History | Annotate | Download | only in include 
      1 /*
      2  * Copyright (C) 2010 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 #ifndef SCOPED_JAVA_UNICODE_STRING_H_included
     18 #define SCOPED_JAVA_UNICODE_STRING_H_included
     19 
     20 #include "JNIHelp.h"
     21 #include "unicode/unistr.h"
     22 
     23 // A smart pointer that provides access to an ICU UnicodeString given a JNI
     24 // jstring. We give ICU a direct pointer to the characters on the Java heap.
     25 // It's clever enough to copy-on-write if necessary.
     26 class ScopedJavaUnicodeString {
     27 public:
     28     ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
     29         mChars = env->GetStringChars(mString, NULL);
     30         const int32_t charCount = env->GetStringLength(mString);
     31         mUnicodeString.setTo(false, mChars, charCount);
     32     }
     33 
     34     ~ScopedJavaUnicodeString() {
     35         mEnv->ReleaseStringChars(mString, mChars);
     36     }
     37 
     38     const UnicodeString& unicodeString() const {
     39         return mUnicodeString;
     40     }
     41 
     42     UnicodeString& unicodeString() {
     43         return mUnicodeString;
     44     }
     45 
     46 private:
     47     JNIEnv* mEnv;
     48     jstring mString;
     49     const UChar* mChars;
     50     UnicodeString mUnicodeString;
     51 
     52     // Disallow copy and assignment.
     53     ScopedJavaUnicodeString(const ScopedJavaUnicodeString&);
     54     void operator=(const ScopedJavaUnicodeString&);
     55 };
     56 
     57 #endif  // SCOPED_JAVA_UNICODE_STRING_H_included
     58