javacommons/security/src/utils/javaclassinstantiator.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 00:10:53 +0300
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Revision: v2.2.15 Kit: 201039
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include "javajniutils.h"
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#include "com_nokia_mj_impl_security_midp_authorization_ClassInstantiator.h"
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using namespace std;
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// forward declarations
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void handleException(JNIEnv*, const char *);
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JNIEXPORT
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jobject JNICALL Java_com_nokia_mj_impl_security_midp_authorization_ClassInstantiator__1newInstance(
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    JNIEnv* env, jclass /*peer*/, jstring className, jobjectArray args)
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{
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    //It is expected that class name is formatted in Java side to
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    //format com/xxx/yyy
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    jboolean isCopy;
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    //Get the class name in utf8 format.
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    const char* utf8ClassName(env->GetStringUTFChars(className, &isCopy));
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    //Find the class
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    jclass cls = env->FindClass(utf8ClassName);
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    handleException(env,"Permission class not found");
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    //Object to be returned
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    jobject obj = 0;
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    if (cls != 0)
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    {
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        //Create the signature. All the arguments are expected to be Strings.
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        std::string signature = "(";
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        int argCount = env->GetArrayLength(args); //How many arguments there are
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        jvalue* jargs = new jvalue[argCount]; //Argument array for NewObjectA()
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        for (int i = 0; i < argCount; i++)
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        {
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            signature += "Ljava/lang/String;"; //Append signature
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            jobject o = env->GetObjectArrayElement(args, i); //Get the argument object
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            jargs[i].l = o; //Store it to array
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        }
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        signature += ")V"; //Append the return type
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        //Try to find the method id.
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        jmethodID ctor = env->GetMethodID(cls,"<init>", signature.c_str());
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        handleException(env, "No constructor found to match the supplied parameters");
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        if (ctor)
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        {
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            //Construct the object
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            obj = env->NewObjectA(cls, ctor, jargs);
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            handleException(env, "Error instantiating a class with the supplied parameters");
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        }
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        delete[] jargs;
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    }
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    //Releasing the allocated class name
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    env->ReleaseStringUTFChars(className, utf8ClassName);
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    return obj;
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}
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void handleException(JNIEnv* env, const char * error_msg)
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{
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    jthrowable ex = env->ExceptionOccurred();
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    if (ex)
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    {
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        env->ExceptionClear();
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        jclass newExcClass;
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        newExcClass = env->FindClass("java/lang/InstantiationException");
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        if (newExcClass != 0)
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        {
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            env->ThrowNew(newExcClass, error_msg);
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        }
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    }
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}
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