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.
26class ScopedJavaUnicodeString {
27public:
28    ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
29        mChars = env->GetStringChars(mString, NULL);
30        const int32_t charCount = env->GetStringLength(mString);
31        mUnicodeString.setTo(false, mChars, charCount);
32    }
33
34    ~ScopedJavaUnicodeString() {
35        mEnv->ReleaseStringChars(mString, mChars);
36    }
37
38    const UnicodeString& unicodeString() const {
39        return mUnicodeString;
40    }
41
42    UnicodeString& unicodeString() {
43        return mUnicodeString;
44    }
45
46private:
47    JNIEnv* mEnv;
48    jstring mString;
49    const UChar* mChars;
50    UnicodeString mUnicodeString;
51
52    // Disallow copy and assignment.
53    ScopedJavaUnicodeString(const ScopedJavaUnicodeString&);
54    void operator=(const ScopedJavaUnicodeString&);
55};
56
57#endif  // SCOPED_JAVA_UNICODE_STRING_H_included
58