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/*
* 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.
class ScopedJavaUnicodeString {
public:
ScopedJavaUnicodeString(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
if (s == NULL) {
jniThrowNullPointerException(mEnv, NULL);
} else {
mChars = env->GetStringChars(mString, NULL);
const int32_t charCount = env->GetStringLength(mString);
mUnicodeString.setTo(false, mChars, charCount);
}
}
~ScopedJavaUnicodeString() {
if (mString != NULL) {
mEnv->ReleaseStringChars(mString, mChars);
}
}
bool valid() const {
return (mString != NULL);
}
const UnicodeString& unicodeString() const {
return mUnicodeString;
}
UnicodeString& unicodeString() {
return mUnicodeString;
}
private:
JNIEnv* mEnv;
jstring mString;
const UChar* mChars;
UnicodeString mUnicodeString;
// Disallow copy and assignment.
ScopedJavaUnicodeString(const ScopedJavaUnicodeString&);
void operator=(const ScopedJavaUnicodeString&);
};
#endif // SCOPED_JAVA_UNICODE_STRING_H_included
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