text: /*
   * Copyright (C) 2010 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.
   */
  
  #ifndef SCOPED_JAVA_UNICODE_STRING_H_included
  #define SCOPED_JAVA_UNICODE_STRING_H_included
  
  #include "JNIHelp.h"
  #include "unicode/unistr.h"
  
  // A smart pointer that provides access to an ICU UnicodeString given a JNI
  // jstring. We give ICU a direct pointer to the characters on the Java heap.
  // It's clever enough to copy-on-write if necessary, but we only provide
  // const UnicodeString access anyway because attempted write access seems
  // likely to be an error.
  class ScopedJavaUnicodeString {
  public:
      ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
          mChars = env->GetStringChars(mString, NULL);
          const int32_t charCount = env->GetStringLength(mString);
          mUnicodeString.setTo(false, mChars, charCount);
      }
  
      ~ScopedJavaUnicodeString() {
          mEnv->ReleaseStringChars(mString, mChars);
      }
  
      const UnicodeString& unicodeString() {
          return mUnicodeString;
      }
  
  private:
      JNIEnv* mEnv;
      jstring mString;
      const UChar* mChars;
      UnicodeString mUnicodeString;
  };
  
  #endif  // SCOPED_JAVA_UNICODE_STRING_H_included
  