1 /*******************************************************************************

     2  * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3  * All rights reserved. This program and the accompanying materials

     4  * are made available under the terms of the Eclipse Public License v1.0

     5  * which accompanies this distribution, and is available at

     6  * http://www.eclipse.org/legal/epl-v10.html

     7  *

     8  * Contributors:

     9  *     Nokia Corporation - initial implementation

    10  *******************************************************************************/

    11 

    12 #ifndef SWTAUTORELEASE_H

    13 #define SWTAUTORELEASE_H

    14 

    15 #include "swtapplication.h"

    16 #include "jniutils.h"

    17 

    18 namespace Java { namespace eSWT {

    19 

    20 /**

    21  * Helper class for auto_ptr like resource management.

    22  * Allocate these objects on stack and let them release the resources

    23  * when the object goes out of scope.

    24  */

    25 template<class T>

    26 class AutoRelease

    27 {

    28 public:

    29     AutoRelease( T* aPointer, bool isArray = false )

    30         : mPointer( aPointer ), mArray( isArray )

    31         {

    32         }

    33     virtual ~AutoRelease()

    34         {

    35         release();

    36         }

    37     T* get()

    38         {

    39         return mPointer;

    40         }

    41     void reset(T* aPointer)

    42         {

    43         release();

    44         mPointer = aPointer;

    45         }

    46 private:

    47     void release()

    48         {

    49         if( mArray )

    50             {

    51             delete[] mPointer;

    52             }

    53         else

    54             {

    55             delete mPointer;

    56             }

    57         mPointer = NULL;

    58         }

    59 private:

    60     T* mPointer;

    61     bool mArray;

    62 };

    63 

    64 

    65 /**

    66  * Helper class to automatically call ReleaseStringChars for a Java

    67  * string chars object obtained from a call to GetStringChars.

    68  */

    69 class AutoReleaseStringChars

    70 {

    71 public:

    72     AutoReleaseStringChars( JNIEnv* aJniEnv, jstring aString, const jchar* aPointer )

    73         : mJniEnv( aJniEnv ), mString( aString ), mPointer( aPointer )

    74         {}

    75     virtual ~AutoReleaseStringChars()

    76         {

    77         mJniEnv->ReleaseStringChars( mString, mPointer );

    78         }

    79 protected:

    80     JNIEnv*      mJniEnv;

    81     jstring      mString;

    82     const jchar* mPointer;

    83 };

    84 

    85 

    86 /**

    87  * Helper class to automatically call DeleteLocalRef to free the

    88  * given Java class reference.

    89  */

    90 class AutoDeleteLocalClassRef

    91 {

    92 public:

    93     AutoDeleteLocalClassRef( JNIEnv* aJniEnv, jclass aClazz )

    94         : mJniEnv( aJniEnv ), mClazz( aClazz )

    95         {}

    96     virtual ~AutoDeleteLocalClassRef()

    97         {

    98         mJniEnv->DeleteLocalRef( mClazz );

    99         }

   100 protected:

   101     JNIEnv* mJniEnv;

   102     jclass mClazz;

   103 };

   104 

   105 /**

   106  * Helper class to automatically free ExecExceptionHandlers.

   107  */

   108 class AutoPopExecStack

   109 {

   110 public:

   111     AutoPopExecStack(QObject* aObject)

   112         {

   113         swtApp->jniUtils().enterExec(aObject);

   114         }

   115     virtual ~AutoPopExecStack()

   116         {

   117         swtApp->jniUtils().leaveExec();

   118         }

   119 };

   120 

   121 }}

   122 

   123 #endif // SWTAUTORELEASE_H

   124