author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-6CEAFE12-EB30-5231-94F4-2D097E79BFE0" xml:lang="en"><title>Implementing |
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the FEP API</title><shortdesc>This topic describes various implementations of FEP.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<section id="GUID-D0CB0202-D4B6-422B-84AA-F70974DDF7F3"><title>Post-platform |
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security – the ECom plugin interface</title><p>In the secure platform, FEPs |
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must be implemented as ECom plug-ins. ECom provides a secure environment for |
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loading FEPs that cannot be achieved using standard, non-ECom polymorphic |
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DLLs. The main tasks that are specific to implementing a FEP as an ECom plug-in |
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are described in this section. Note that the differences between pre- and |
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post-platform security FEPs are imposed by the change from old-style, standard |
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polymorphic DLLs to ECom plugins. The C++ APIs involved in FEP creation, which |
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are defined in <filepath>fepbase.h</filepath>, are unchanged. </p> </section> |
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<section id="GUID-97C929BB-0523-45F4-8100-D8065B9A53D5"><title>Define a class |
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that implements the CCoeFepPlugIn interface</title><p>This class must implement |
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the <codeph>NewFepL()</codeph> and <codeph>SynchronouslyExecuteSettingsDialogL()</codeph> functions |
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that were, pre-platform security, the first and second exports from the DLL. |
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Note that these functions have been redefined and no longer take the const <codeph>TDesC& |
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aFullFileNameOfDll </codeph> argument: the ECom plugin implementation is identified |
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by a UID rather than a filename. This means that the implementation of <codeph>SynchronouslyExecuteSettingsDialogL()</codeph> is |
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now responsible for locating the resource file needed to execute the settings |
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dialog itself. </p> <codeblock id="GUID-310F5ADC-B9CB-5A3B-878F-AF13C4C4C08B" xml:space="preserve">class CCoeFepPlugIn : public CBase |
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{ |
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public: |
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inline static CCoeFepPlugIn* NewL(TUid aFepUid); |
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virtual ~CCoeFepPlugIn(); |
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public: |
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virtual CCoeFep* NewFepL(CCoeEnv& aConeEnvironment, const CCoeFepParameters& aFepParameters) = 0; |
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virtual void SynchronouslyExecuteSettingsDialogL(CCoeEnv& aConeEnvironment) = 0; |
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}; |
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</codeblock> </section> |
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<section id="GUID-939614DA-C3EF-43FD-924A-805596AEC2FD"><title>Provide the |
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factory code required to instantiate the derived class </title> <p>FEPs must |
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provide the standard factory code required by every ECom plugin. For more |
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information, see “Using ECom” in the Symbian Developer Library. For example, |
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(the following code is taken from <filepath>TFEP1PlugIn.cpp</filepath>): </p> <codeblock id="GUID-88F37824-8CAA-53B8-BD69-AB5B17B9BBB5" xml:space="preserve">const TInt KTstFepPlugInImplementationValue = 0x102024D0; |
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const TImplementationProxy ImplementationTable[] = |
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{ |
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IMPLEMENTATION_PROXY_ENTRY(KTstFepPlugInImplementationValue, CTstFepPlugIn::NewL ) |
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}; |
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EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount) |
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{ |
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aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy); |
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return ImplementationTable; |
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} |
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CTstFepPlugIn* CTstFepPlugIn::NewL() |
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{ // static |
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return new(ELeave) CTstFepPlugIn; |
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} |
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</codeblock></section> |
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<section id="GUID-FC0B99AB-B579-42A2-8A0C-3A36BE648616"><title>Create an ECom |
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resource file</title> <p>Each FEP must have an ECom resource file. Its interface |
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UID must be 0x1020233f, or CONE will not be able to find the FEP. For example, </p> <codeblock id="GUID-5CBDB731-EBAD-5326-909C-4DF78E7AC360" xml:space="preserve">#include <RegistryInfo.rh> |
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RESOURCE REGISTRY_INFO theInfo |
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{ |
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dll_uid = 0x102024D0; // UID3 of the DLL |
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interfaces = |
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{ |
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INTERFACE_INFO |
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{ |
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interface_uid = 0x1020233F; // Same for every FEP |
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implementations = |
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{ |
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IMPLEMENTATION_INFO |
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{ |
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implementation_uid = 0x102024D0; |
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version_no = 1; |
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display_name = "FEPNAME"; |
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default_data = ""; |
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opaque_data = ""; |
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} |
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}; |
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} |
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}; |
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}</codeblock></section> |
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<section id="GUID-BEDE8AA4-843E-405E-A8F9-EC80893D7D59"><title>The CCoeFep |
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class</title> <p>The parts of <xref href="GUID-ADAA039A-7BF3-3B06-8486-2E3604C2633D.dita"><apiname>CCoeFep</apiname></xref> relevant to classes |
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deriving from it are shown below: </p> <codeblock id="GUID-14B6DFB4-02DE-5D12-BBFB-0665F6B089E0" xml:space="preserve">class CCoeFep : public CBase, protected MFepAttributeStorer, public MCoeForegroundObserver, public MCoeFocusObserver |
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{ |
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public: |
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enum TEventResponse |
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{ |
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EEventWasNotConsumed, |
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EEventWasConsumed |
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}; |
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class MDeferredFunctionCall |
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{ |
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public: |
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virtual void ExecuteFunctionL()=0; |
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}; |
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class MModifiedCharacter |
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{ |
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public: |
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virtual TUint CharacterCode() const=0; |
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virtual TUint ModifierMask() const=0; |
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virtual TUint ModifierValues() const=0; |
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}; |
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public: |
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IMPORT_C virtual ~CCoeFep(); |
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virtual void CancelTransaction()=0; |
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protected: |
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IMPORT_C CCoeFep(CCoeEnv& aConeEnvironment); |
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IMPORT_C void BaseConstructL(const CCoeFepParameters& aFepParameters); |
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IMPORT_C void ReadAllAttributesL(); |
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IMPORT_C void MakeDeferredFunctionCall(MDeferredFunctionCall& aDeferredFunctionCall); |
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IMPORT_C void SimulateKeyEventsL(const TArray<TUint>& aArrayOfCharacters); |
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IMPORT_C void SimulateKeyEventsL(const TArray<MModifiedCharacter>& aArrayOfModifiedCharacters); |
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IMPORT_C void WriteAttributeDataAndBroadcastL(TUid aAttributeUid); |
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IMPORT_C void WriteAttributeDataAndBroadcastL(const TArray<TUid>& aAttributeUids); |
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IMPORT_C TBool IsOn() const; |
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private: |
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virtual void IsOnHasChangedState()=0; |
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virtual void OfferKeyEventL(TEventResponse& aEventResponse, const TKeyEvent& aKeyEvent, TEventCode aEventCode)=0; |
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virtual void OfferPointerEventL(TEventResponse& aEventResponse, const TPointerEvent& aPointerEvent, const CCoeControl* aWindowOwningControl)=0; |
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virtual void OfferPointerBufferReadyEventL(TEventResponse& aEventResponse, const CCoeControl* aWindowOwningControl)=0; |
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}; |
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</codeblock> <p>Note that <xref href="GUID-ADAA039A-7BF3-3B06-8486-2E3604C2633D.dita"><apiname>CCoeFep</apiname></xref> inherits, but does not |
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override, some pure virtual functions from its base classes <xref href="GUID-270424BB-124B-39FF-9CDA-5CAFB5407FAE.dita"><apiname>MFepAttributeStorer</apiname></xref>, <xref href="GUID-2CAC79B0-8BD3-3961-A162-75B004AEE5FC.dita"><apiname>MCoeForegroundObserver</apiname></xref> and <xref href="GUID-E591B7D7-ED56-3CEF-883F-7091D5833731.dita"><apiname>MCoeFocusObserver</apiname></xref>. These therefore need to be overridden in addition |
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to <xref href="GUID-ADAA039A-7BF3-3B06-8486-2E3604C2633D.dita"><apiname>CCoeFep</apiname></xref> ’s own pure virtual member functions. The details |
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of the member functions of <xref href="GUID-ADAA039A-7BF3-3B06-8486-2E3604C2633D.dita"><apiname>CCoeFep</apiname></xref> and its base classes |
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are explained in various sections of this document. </p></section> |
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<section id="GUID-ECA1F4AE-1B25-4079-B249-AC8ECF3D3F90"><title>The CCoeControl |
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class</title><p>The <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita"><apiname>CCoeControl</apiname></xref> class (defined in <filepath>epoc32\include\COECNTRL.H</filepath>) |
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provides many useful features for implementing a FEP, such as functions for |
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handling window server events. In fact, for FEPs wishing to intercept key |
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events, writing a class that derives from <codeph>CCoeControl</codeph> is |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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a necessity because of the need to use the control stack (see <xref href="GUID-CFC70204-1AD4-5DF0-ADDC-CDE4B39CFF96.dita#GUID-CFC70204-1AD4-5DF0-ADDC-CDE4B39CFF96/GUID-1B15C661-851B-5922-B8BC-7A772232DBD2">Intercepting key events</xref>, below). Thus although deriving from <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita"><apiname>CCoeControl</apiname></xref> is |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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not explicitly demanded by the FEP architecture, it is assumed throughout |
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this document that the object of the <xref href="GUID-ADAA039A-7BF3-3B06-8486-2E3604C2633D.dita"><apiname>CCoeFep</apiname></xref> derived |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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class owns an object of a <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita"><apiname>CCoeControl</apiname></xref> derived class. </p></section> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</conbody></concept> |