javaextensions/location/common/src/lapijnicommon.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 14 May 2010 15:47:24 +0300
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permissions -rw-r--r--
Revision: v2.1.24 Kit: 201019
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/*
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* Copyright (c) 2008 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:  Common JNI implementations
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 *
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*/
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// INTERNAL INCLUDES
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#include "lapijnicommon.h"
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#include "clapilandmark.h"
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#include "javasymbianoslayer.h"
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#include "lapipanics.h"
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#include "jstringutils.h"
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#include "s60commonutils.h"
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#include "logger.h"
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// EXTERNAL INCLUDES
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#include <lbsposition.h>
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// UNNAMED LOCAL NAMESPACE
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namespace
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{
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// Size of the coordinates array (latitude and longitude)
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const TInt KLAPINumCoordinates = 2;
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// Size of the coordinate information array (altitude, horizontal
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// accuracy and vertical accuracy
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const TInt KLAPINumCoordinateInfos = 3;
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}
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/**
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 * Sets an error code to an error array
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 * @param aJniEnv Pointer to the JNI environment
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 * @param aTo The array to which the error is to be added
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 * @param aFrom The value which will be added to the array
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 */
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void SetJavaErrorCode(JNIEnv& aJniEnv, jintArray aTo, TInt aFrom)
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{
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    JELOG2(EJavaLocation);
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    jint javaError[1] =
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        { aFrom };
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    aJniEnv.SetIntArrayRegion(aTo, 0, 1, javaError);
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}
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/**
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 * Creates a position from the passed coordinate information
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 * @param aJniEnv A reference to the JNI environment
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 * @param aCoordinates Latitude and longitude values
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 * @param aCoordinateInfo Altitude, horizontal accuracy and vertical accurazy
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 */
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TLocality CreatePosition(JNIEnv& aJniEnv, jdoubleArray aCoordinates,
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                         jfloatArray aCoordinateInfo)
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{
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    JELOG2(EJavaLocation);
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    __ASSERT_DEBUG(aCoordinates && aCoordinateInfo, LAPIError::Panic(
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                       ELAPIPanicNullArgument));
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    jdouble dArray[KLAPINumCoordinates];
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    jfloat fArray[KLAPINumCoordinateInfos];
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    // Get latitude and longitude
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    aJniEnv.GetDoubleArrayRegion(aCoordinates, 0, KLAPINumCoordinates, dArray);
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    // Get altitude, horizontal accuracy and vertical accuracy
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    aJniEnv.GetFloatArrayRegion(aCoordinateInfo, 0, KLAPINumCoordinateInfos,
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                                fArray);
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    TCoordinate coordinates(dArray[0], dArray[1], fArray[0]);
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    TLocality position(coordinates, fArray[1], fArray[2]);
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    return position;
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}
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/**
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 * Creates a position information from the passed position
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 * @param aJniEnv A reference to the JNI environment
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 * @param aCoordinates Latitude and longitude values
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 * @param aCoordinateInfo Altitude, horizontal accuracy and vertical accurazy
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 */
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void CreateCoordinateInfos(JNIEnv& aJniEnv, const TLocality& aPosition,
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                           jdoubleArray aCoordinates, jfloatArray aCoordinateInfo)
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{
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    JELOG2(EJavaLocation);
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    __ASSERT_DEBUG(
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        (aJniEnv.GetArrayLength(aCoordinates) >= KLAPINumCoordinates),
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        LAPIError::Panic(ELAPIPanicJniIncorrectArrayLength));
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    __ASSERT_DEBUG((aJniEnv.GetArrayLength(aCoordinateInfo)
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                    >= KLAPINumCoordinateInfos), LAPIError::Panic(
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                       ELAPIPanicJniIncorrectArrayLength));
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    jdouble coordinates[KLAPINumCoordinates] =
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        { aPosition.Latitude(), aPosition.Longitude() };
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    jfloat coordinateInfo[KLAPINumCoordinateInfos] =
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        { aPosition.Altitude(), aPosition.HorizontalAccuracy(),
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          aPosition.VerticalAccuracy()
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        };
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    // Set coordinate values to the java array
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    aJniEnv.SetDoubleArrayRegion(aCoordinates, 0, KLAPINumCoordinates,
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                                 coordinates);
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    // Set coordinate information to the java array
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    aJniEnv.SetFloatArrayRegion(aCoordinateInfo, 0, KLAPINumCoordinateInfos,
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                                coordinateInfo);
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}
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   114
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/**
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 * Creates a new native string array from java string array
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 * @param aJniEnv A reference to the JNI environment
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 * @param aJavaArray The Java string array from which the new array is created
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 */
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RPointerArray<HBufC> CreateNativeStringArrayL(JNIEnv& aJniEnv,
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        jobjectArray aJavaArray)
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{
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    JELOG2(EJavaLocation);
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    TInt count = 0;
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    if (aJavaArray)
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    {
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        count = aJniEnv.GetArrayLength(aJavaArray);
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    }
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    // Create pointer array holding HBufCs so that null java elements
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    // can be represented as NULL pointers in the array
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    RPointerArray<HBufC> nativeArray(10);
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    CleanupResetAndDestroyPushL(nativeArray);
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   133
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    for (TInt i = 0; i < count; i++)
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    {
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        // Creates a new local reference
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        jobject joe = aJniEnv.GetObjectArrayElement(aJavaArray, i);
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        jstring javaString = static_cast<jstring>(joe);
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   139
        if (!javaString)
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        {
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            nativeArray.AppendL(NULL);
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        }
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        else
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        {
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            // The value returned by GetObjectArrayElement is not really
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            // a pointer to the object, but it is a "local reference".
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            // In practice, it is a pointer to a pointer which points to the
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            // object. If the object is null, we get a pointer which points
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            // to a pointer which points to null.
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            TAny** objPointer = reinterpret_cast<TAny**>(joe);
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            TAny* obj = *objPointer;
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            if (!obj)
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            {
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                nativeArray.AppendL(NULL);
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            }
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            else
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            {
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                JStringUtils nativeElem(aJniEnv, javaString);
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                HBufC* element = nativeElem.AllocLC();
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                nativeArray.AppendL(element);
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                CleanupStack::Pop(element);
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            }
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        }
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        // The VM runs out of temporary local references, unless the
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        // elements are not released here
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        aJniEnv.DeleteLocalRef(joe);
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   167
    }
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   168
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    CleanupStack::Pop(&nativeArray);
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    return nativeArray;
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}
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   172
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/**
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 * Creates a new java string array from a native string array
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 * @param aJniEnv A reference to the JNI environment
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 * @param aNativeArray The native string array from which the new array is created
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 */
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jobjectArray CreateJavaStringArray(JNIEnv& aJniEnv,
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                                   RPointerArray<HBufC>& aNativeArray)
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{
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    JELOG2(EJavaLocation);
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   182
    return java::util::S60CommonUtils::NativeToJavaStringArray(aJniEnv,
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            aNativeArray);
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}
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   185
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jobjectArray CopyToNewJavaStringArrayL(JNIEnv& aJni,
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   187
                                       const CDesCArray& aNativeArray)
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   188
{
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   189
    JELOG2(EJavaLocation);
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   190
    jclass stringClass = aJni.FindClass("java/lang/String");
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   191
    User::LeaveIfNull(stringClass);
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   192
    //
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   193
    jobjectArray result = aJni.NewObjectArray(aNativeArray.Count(),
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                          stringClass, NULL);
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   195
    if (result != NULL)
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   196
    {
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   197
        TPtrC item;
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   198
        for (int i = 0; i < aNativeArray.Count(); ++i)
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   199
        {
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            item.Set(aNativeArray[i]);
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   201
            jstring javaString =
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   202
                java::util::S60CommonUtils::NativeToJavaString(aJni, item);
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   203
            User::LeaveIfNull(javaString);
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   204
            //
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   205
            aJni.SetObjectArrayElement(result, i, javaString);
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   206
            aJni.DeleteLocalRef(javaString);
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   207
        }
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   208
    }
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   209
    return result;
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   210
}
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   211
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   212
/**
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   213
 * Creates an item handle array from the paased landmarks
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   214
 * @param aJniEnv A reference to the JNI environment
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 * @param aLandmarks The landmarks from which the handles are created
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 * @return Java integer array. Ownership is transferred to the caller
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 */
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jintArray CreateHandleArray(JNIEnv& aJniEnv,
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                            const CArrayPtr<CLAPILandmark>& aLandmarks)
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{
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    JELOG2(EJavaLocation);
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    TInt count = aLandmarks.Count();
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    jintArray handles = aJniEnv.NewIntArray(count);
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    if (handles && count > 0)
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    {
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        jint* elems = aJniEnv.GetIntArrayElements(handles, NULL);
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        if (!elems)
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        {
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            return NULL; // Error
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        }
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        // Make handles from the native side peer objects
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        for (TInt i = 0; i < count; i++)
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        {
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            elems[i] = reinterpret_cast<jint>(aLandmarks[i]);
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        }
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        // Elemenet must be released since it is local
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        aJniEnv.ReleaseIntArrayElements(handles, elems, 0);
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    }
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    return handles;
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}
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// End of file