Elliott Hughes | d5344fe | 2010-01-28 12:18:39 -0800 | [diff] [blame^] | 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 | |
| 22 | // A smart pointer that provides access to an ICU UnicodeString given a JNI |
| 23 | // jstring. We give ICU a direct pointer to the characters on the Java heap. |
| 24 | // It's clever enough to copy-on-write if necessary, but we only provide |
| 25 | // const UnicodeString access anyway because attempted write access seems |
| 26 | // likely to be an error. |
| 27 | class ScopedJavaUnicodeString { |
| 28 | public: |
| 29 | ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) { |
| 30 | mChars = env->GetStringChars(mString, NULL); |
| 31 | const int32_t charCount = env->GetStringLength(mString); |
| 32 | mUnicodeString.setTo(false, mChars, charCount); |
| 33 | } |
| 34 | |
| 35 | ~ScopedJavaUnicodeString() { |
| 36 | mEnv->ReleaseStringChars(mString, mChars); |
| 37 | } |
| 38 | |
| 39 | const UnicodeString& unicodeString() { |
| 40 | return mUnicodeString; |
| 41 | } |
| 42 | |
| 43 | private: |
| 44 | JNIEnv* mEnv; |
| 45 | jstring mString; |
| 46 | const UChar* mChars; |
| 47 | UnicodeString mUnicodeString; |
| 48 | }; |
| 49 | |
| 50 | #endif // SCOPED_JAVA_UNICODE_STRING_H_included |