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Elliott Hughesd5344fe2010-01-28 12:18:39 -08001/*
2 * Copyright (C) 2010 The Android Open Source Project
Elliott Hughes3aac4dd2013-02-04 15:37:52 -08003 *
Elliott Hughesd5344fe2010-01-28 12:18:39 -08004 * 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
Elliott Hughes3aac4dd2013-02-04 15:37:52 -08007 *
Elliott Hughesd5344fe2010-01-28 12:18:39 -08008 * http://www.apache.org/licenses/LICENSE-2.0
Elliott Hughes3aac4dd2013-02-04 15:37:52 -08009 *
Elliott Hughesd5344fe2010-01-28 12:18:39 -080010 * 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"
Elliott Hughesa656b242010-03-01 16:28:05 -080021#include "unicode/unistr.h"
Elliott Hughesd5344fe2010-01-28 12:18:39 -080022
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.
Elliott Hughes9de899c2010-04-12 18:32:50 -070025// It's clever enough to copy-on-write if necessary.
Elliott Hughesd5344fe2010-01-28 12:18:39 -080026class ScopedJavaUnicodeString {
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080027 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);
Elliott Hughesd5344fe2010-01-28 12:18:39 -080035 }
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080036 }
Elliott Hughesd5344fe2010-01-28 12:18:39 -080037
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080038 ~ScopedJavaUnicodeString() {
39 if (mString != NULL) {
40 mEnv->ReleaseStringChars(mString, mChars);
Elliott Hughesd5344fe2010-01-28 12:18:39 -080041 }
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080042 }
Elliott Hughesd5344fe2010-01-28 12:18:39 -080043
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080044 bool valid() const {
45 return (mString != NULL);
46 }
Elliott Hughes9de899c2010-04-12 18:32:50 -070047
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080048 const UnicodeString& unicodeString() const {
49 return mUnicodeString;
50 }
Elliott Hughesd5344fe2010-01-28 12:18:39 -080051
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080052 UnicodeString& unicodeString() {
53 return mUnicodeString;
54 }
Elliott Hughes7ca6fd02010-03-29 20:51:48 -070055
Elliott Hughes3aac4dd2013-02-04 15:37:52 -080056 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&);
Elliott Hughesd5344fe2010-01-28 12:18:39 -080065};
66
67#endif // SCOPED_JAVA_UNICODE_STRING_H_included