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      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     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 
     38   ~ScopedJavaUnicodeString() {
     39     if (mString != NULL) {
     40       mEnv->ReleaseStringChars(mString, mChars);
     41     }
     42   }
     43 
     44   bool valid() const {
     45     return (mString != NULL);
     46   }
     47 
     48   const UnicodeString& unicodeString() const {
     49     return mUnicodeString;
     50   }
     51 
     52   UnicodeString& unicodeString() {
     53     return mUnicodeString;
     54   }
     55 
     56  private:
     57   JNIEnv* mEnv;
     58   jstring mString;
     59   const UChar* mChars;
     60   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