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 <nativehelper/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: ScopedJavaUnicodeString(JNIEnv * env,jstring s)28 ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) { 29 if (s == NULL) { 30 jniThrowNullPointerException(mEnv, NULL); 31 } else { 32 mChars = env->GetStringChars(mString, NULL); 33 const int32_t charCount = env->GetStringLength(mString); 34 mUnicodeString.setTo(false, mChars, charCount); 35 } 36 } 37 ~ScopedJavaUnicodeString()38 ~ScopedJavaUnicodeString() { 39 if (mString != NULL) { 40 mEnv->ReleaseStringChars(mString, mChars); 41 } 42 } 43 valid()44 bool valid() const { 45 return (mString != NULL); 46 } 47 unicodeString()48 const icu::UnicodeString& unicodeString() const { 49 return mUnicodeString; 50 } 51 unicodeString()52 icu::UnicodeString& unicodeString() { 53 return mUnicodeString; 54 } 55 56 private: 57 JNIEnv* mEnv; 58 jstring mString; 59 const jchar* mChars; 60 icu::UnicodeString mUnicodeString; 61 62 // Disallow copy and assignment. 63 ScopedJavaUnicodeString(const ScopedJavaUnicodeString&); 64 void operator=(const ScopedJavaUnicodeString&); 65 }; 66 67 #endif // SCOPED_JAVA_UNICODE_STRING_H_included 68