src/Java/Class.hpp

   1 /*
   2  * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the
  14  * distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  20  * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  27  * OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef XCSOAR_JAVA_CLASS_HPP
  31 #define XCSOAR_JAVA_CLASS_HPP
  32
  33 #include "Java/Ref.hpp"
  34
  35 #include <assert.h>
  36
  37 namespace Java {
  38   /**
  39    * Wrapper for a local "jclass" reference.
  40    */
  41   class Class : public Java::LocalRef<jclass> {
  42   public:
  43     Class(JNIEnv *env, jclass cls)
  44       :LocalRef<jclass>(env, cls) {}
  45
  46     Class(JNIEnv *env, const char *name)
  47       :LocalRef<jclass>(env, env->FindClass(name)) {}
  48   };
  49
  50   /**
  51    * Wrapper for a global "jclass" reference.
  52    */
  53   class TrivialClass : public TrivialRef<jclass> {
  54   public:
  55     void Find(JNIEnv *env, const char *name) {
  56       assert(env != NULL);
  57       assert(name != NULL);
  58
  59       jclass cls = env->FindClass(name);
  60       assert(cls != NULL);
  61
  62       Set(env, cls);
  63       env->DeleteLocalRef(cls);
  64     }
  65
  66     bool FindOptional(JNIEnv *env, const char *name) {
  67       assert(env != NULL);
  68       assert(name != NULL);
  69
  70       jclass cls = env->FindClass(name);
  71       if (cls == NULL) {
  72         env->ExceptionClear();
  73         return false;
  74       }
  75
  76       Set(env, cls);
  77       env->DeleteLocalRef(cls);
  78       return true;
  79     }
  80   };
  81 }
  82
  83 #endif