jni/linux/JStringWrap.h

/*
 * Copyright 2007 Google Inc.
 * 
 * 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 JNI_LINUX_JSTRINGWRAP_H_
#define JNI_LINUX_JSTRINGWRAP_H_

/*
 * Wrapper arouond Java Strings, keeps pointers to unpacked strings
 * and makes sure they are cleaned up. 
 */
class JStringWrap {
  public:
    JStringWrap(JNIEnv* env, jstring str): env(env), s(str), p(0), jp(0) { }
    ~JStringWrap() {
      if (p) env->ReleaseStringUTFChars(s, p);
      if (jp) env->ReleaseStringChars(s, jp);
    }
    const char* str() {
      if (!p) p = env->GetStringUTFChars(s, 0);
      return p;
    }
    const jchar* jstr() {
      if (!jp) jp = env->GetStringChars(s, 0);
      return jp;
    }
    int length() {
      return env->GetStringLength(s);
    }
  private:
    JNIEnv* env;
    jstring s;
    const char* p;
    const jchar* jp;
};


#endif // JNI_LINUX_JSTRINGWRAP_H_