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/**
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* Copyright (c) 2004-2009 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
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* which accompanies this distribution, and is available
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* at the URL "http://www.symbianfoundation.org/legal/licencesv10.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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/**
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@file MetaType.h
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@internalTechnology
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*/
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#if (!defined METATYPE_H)
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#define METATYPE_H
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#include <e32base.h>
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#include <e32std.h>
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namespace Meta
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{
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template<class TYPE> class TMeta;
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typedef TMeta<TInt> TMetaNumber;
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typedef TMeta<TTime> TMetaTime;
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class MMetaType
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/**
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Abstract interface of a helper meta type. A meta type is responsible for handling
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a particular type. A meta type knows how to copy an object of the type, store it
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in a descriptor, load, etc, etc.
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@internalComponent
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@released since v9.0 */
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{
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public:
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virtual TInt Load(TPtrC8& aBuffer) = 0;
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virtual TInt Store(TDes8& aBuffer) const = 0;
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virtual void Copy(const TAny* aData) = 0;
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virtual TInt Length() const = 0;
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};
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template<class TYPE>
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class TMeta : public MMetaType
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/**
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Implementation of MMetaType for simple types (e.g. symbian T-types).
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@internalComponent
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@released since v9.0 */
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{
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public:
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inline static MMetaType* NewL(const TAny* aMem, const TAny* aData);
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public:
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virtual TInt Load(TPtrC8& aBuffer);
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virtual TInt Store(TDes8& aBuffer) const;
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virtual void Copy(const TAny* aData);
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virtual TInt Length() const;
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protected:
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TMeta(const TAny* aData);
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private:
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const TYPE* iData;
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};
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template<class TYPE>
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class TMetaObject : public MMetaType
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/**
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Implementation of MMetaType for meta objects
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@internalComponent
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@released since v9.0 */
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{
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public:
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inline static MMetaType* NewL(const TAny* aMem, const TAny* aData);
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public:
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virtual TInt Load(TPtrC8& aBuffer);
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virtual TInt Store(TDes8& aBuffer) const;
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virtual void Copy(const TAny* aData);
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virtual TInt Length() const;
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protected:
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TMetaObject(const TAny* aData);
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private:
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TYPE* iData;
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};
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template<class TYPE>
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class TMetaObjectPtr : public MMetaType
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/**
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Implementation of MMetaType for meta pointers to objects that are never created
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@internalComponent
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@released since v9.0 */
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{
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public:
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inline static MMetaType* NewL(const TAny* aMem, const TAny* aData);
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public:
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virtual TInt Load(TPtrC8& aBuffer);
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virtual TInt Store(TDes8& aBuffer) const;
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virtual void Copy(const TAny* aData);
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virtual TInt Length() const;
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protected:
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TMetaObjectPtr(const TAny* aData);
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private:
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TYPE** iData;
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};
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template<class TYPE>
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class TMetaPtr : public MMetaType
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/**
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Implementation of MMetaType for pointers to meta objects
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@internalComponent
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@released since v9.0 */
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{
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public:
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inline static MMetaType* NewL(const TAny* aMem, const TAny* aData);
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virtual TInt Load(TPtrC8& aBuffer);
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virtual TInt Store(TDes8& aBuffer) const;
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virtual void Copy(const TAny* aData);
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virtual TInt Length() const;
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protected:
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TMetaPtr(const TAny* aData);
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private:
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TYPE** iData;
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};
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template<class TYPE>
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MMetaType* TMeta<TYPE>::NewL(const TAny* aMem, const TAny* aData)
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/**
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* Instantiates a meta type of a particular type.
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* Used for attribure registration (in the data v-table).
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*/
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{
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return ::new ((TUint8*)aMem) TMeta<TYPE>(aData);
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}
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template<class TYPE>
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inline TMeta<TYPE>::TMeta(const TAny* aData)
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: iData((TYPE*)aData)
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/**
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* Constructor
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*/
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{
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__ASSERT_DEBUG(iData!=NULL,User::Panic(_L("TMetaType"),KErrArgument));
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}
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template<class TYPE>
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TInt TMeta<TYPE>::Load(TPtrC8& aBuffer)
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/**
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* Loads content of a meta object (in iData) from a descriptor
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*/
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{
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TInt len = Length();
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if (aBuffer.Length() < len)
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{
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return KErrArgument;
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}
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Mem::Copy((TYPE*)iData,aBuffer.Ptr(),len);
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aBuffer.Set(aBuffer.Ptr()+len, aBuffer.Length()-len); //update pointer
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return KErrNone;
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}
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template<class TYPE>
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TInt TMeta<TYPE>::Store(TDes8& aBuffer) const
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/**
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* Stores content of a meta object (in iData) to a descriptor
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*/
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{
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TInt len = Length();
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if (aBuffer.MaxLength() - aBuffer.Length() < len)
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{
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return KErrOverflow;
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}
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aBuffer.Append((TUint8*)iData, len);
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return KErrNone;
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}
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template<class TYPE>
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void TMeta<TYPE>::Copy(const TAny* aData)
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/**
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* Copies content of a meta object (in aData) into another meta object (in iData).
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* This is a MMetaType implementation for simple (T) types so it just copies the memory.
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*/
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{
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Mem::Copy((TAny*)iData,aData,Length());
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}
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template<class TYPE>
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TInt TMeta<TYPE>::Length() const
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/**
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* Returns the length of the handled meta object.
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*/
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{
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return sizeof(TYPE);
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}
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template<class TYPE>
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MMetaType* TMetaObject<TYPE>::NewL(const TAny* aMem, const TAny* aData)
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/**
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* Instantiates a meta type of a particular type.
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* Used for attribure registration (in the data v-table).
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*/
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{
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return ::new ((TUint8*)aMem) TMetaObject<TYPE>(aData);
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}
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template<class TYPE>
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inline TMetaObject<TYPE>::TMetaObject(const TAny* aData)
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: iData((TYPE*)aData)
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/**
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* Constructor
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*/
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{
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__ASSERT_DEBUG(iData!=NULL,User::Panic(_L("TMetaType"),KErrArgument));
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}
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template<class TYPE>
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TInt TMetaObject<TYPE>::Load(TPtrC8& aBuffer)
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/**
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* Loads content of a meta object (in iData) from a descriptor
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*/
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{
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TInt err = iData->GetTypeId().Check( aBuffer );
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return err == KErrNone ? iData->Load(aBuffer) : err;
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}
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template<class TYPE>
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TInt TMetaObject<TYPE>::Store(TDes8& aBuffer) const
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/**
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* Stores content of a meta object (in iData) to a descriptor
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*/
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{
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return iData->Store(aBuffer);
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}
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template<class TYPE>
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void TMetaObject<TYPE>::Copy(const TAny* aData)
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/**
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* Copies content of a meta object (in aData) into another meta object (in iData).
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*/
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{
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iData->Copy(*((TYPE*)aData));
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}
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template<class TYPE>
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TInt TMetaObject<TYPE>::Length() const
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/**
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* Returns the length of the handled meta object.
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*/
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{
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return iData->Length();
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}
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template<class TYPE>
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MMetaType* TMetaObjectPtr<TYPE>::NewL(const TAny* aMem, const TAny* aData)
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/**
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* Instantiates a meta type of a particular type.
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* Used for attribure registration (in the data v-table).
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*/
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{
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return ::new ((TUint8*)aMem) TMetaObjectPtr<TYPE>(aData);
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}
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template<class TYPE>
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inline TMetaObjectPtr<TYPE>::TMetaObjectPtr(const TAny* aData)
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: iData((TYPE**)aData)
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/**
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* Constructor
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*/
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{
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__ASSERT_DEBUG(iData!=NULL,User::Panic(_L("TMetaType"),KErrArgument));
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__ASSERT_DEBUG(*iData!=NULL,User::Panic(_L("TMetaType"),KErrArgument));
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}
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template<class TYPE>
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TInt TMetaObjectPtr<TYPE>::Load(TPtrC8& aBuffer)
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/**
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* Loads content of a meta object (in iData) from a descriptor
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*/
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{
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TInt err = (*iData)->GetTypeId().Check( aBuffer );
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return err == KErrNone ? (*iData)->Load(aBuffer) : err;
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}
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template<class TYPE>
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TInt TMetaObjectPtr<TYPE>::Store(TDes8& aBuffer) const
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/**
|
williamr@2
|
317 |
* Stores content of a meta object (in iData) to a descriptor
|
williamr@2
|
318 |
*/
|
williamr@2
|
319 |
{
|
williamr@2
|
320 |
return (*iData)->Store(aBuffer);
|
williamr@2
|
321 |
}
|
williamr@2
|
322 |
|
williamr@2
|
323 |
template<class TYPE>
|
williamr@2
|
324 |
void TMetaObjectPtr<TYPE>::Copy(const TAny* aData)
|
williamr@2
|
325 |
/**
|
williamr@2
|
326 |
* Copies content of a meta object (in aData) into another meta object (in iData).
|
williamr@2
|
327 |
*/
|
williamr@2
|
328 |
{
|
williamr@2
|
329 |
(*iData)->Copy(*((TYPE*)aData));
|
williamr@2
|
330 |
}
|
williamr@2
|
331 |
|
williamr@2
|
332 |
template<class TYPE>
|
williamr@2
|
333 |
TInt TMetaObjectPtr<TYPE>::Length() const
|
williamr@2
|
334 |
/**
|
williamr@2
|
335 |
* Returns the length of the handled meta object.
|
williamr@2
|
336 |
*/
|
williamr@2
|
337 |
{
|
williamr@2
|
338 |
return (*iData)->Length();
|
williamr@2
|
339 |
}
|
williamr@2
|
340 |
|
williamr@2
|
341 |
template<class TYPE>
|
williamr@2
|
342 |
inline TMetaPtr<TYPE>::TMetaPtr(const TAny* aData)
|
williamr@2
|
343 |
: iData((TYPE**)aData)
|
williamr@2
|
344 |
/**
|
williamr@2
|
345 |
* Constructor
|
williamr@2
|
346 |
*/
|
williamr@2
|
347 |
{
|
williamr@2
|
348 |
}
|
williamr@2
|
349 |
|
williamr@2
|
350 |
template<class TYPE>
|
williamr@2
|
351 |
MMetaType* TMetaPtr<TYPE>::NewL(const TAny* aMem, const TAny* aData)
|
williamr@2
|
352 |
/**
|
williamr@2
|
353 |
* Instantiates a meta type of a particular type.
|
williamr@2
|
354 |
* Used for attribure registration (in the data v-table).
|
williamr@2
|
355 |
*/
|
williamr@2
|
356 |
{
|
williamr@2
|
357 |
return ::new ((TUint8*)aMem) TMetaPtr<TYPE>(aData);
|
williamr@2
|
358 |
}
|
williamr@2
|
359 |
|
williamr@2
|
360 |
template<class TYPE>
|
williamr@2
|
361 |
TInt TMetaPtr<TYPE>::Load(TPtrC8& aBuffer)
|
williamr@2
|
362 |
/**
|
williamr@2
|
363 |
* Loads content of a meta object (in iData) from a descriptor
|
williamr@2
|
364 |
*/
|
williamr@2
|
365 |
{
|
williamr@2
|
366 |
if (aBuffer.Length() < (TInt) sizeof(TUint32))
|
williamr@2
|
367 |
{
|
williamr@2
|
368 |
return KErrArgument;
|
williamr@2
|
369 |
}
|
williamr@2
|
370 |
|
williamr@2
|
371 |
// Check for a NULL pointer when stored (First four bytes == 0)
|
williamr@2
|
372 |
if (*((TUint32*)aBuffer.Ptr()) == 0)
|
williamr@2
|
373 |
{
|
williamr@2
|
374 |
// The pointer was NULL when it was stored
|
williamr@2
|
375 |
aBuffer.Set(aBuffer.Ptr() + sizeof(TUint32), aBuffer.Length() - sizeof(TUint32));
|
williamr@2
|
376 |
if (*iData != NULL)
|
williamr@2
|
377 |
{
|
williamr@2
|
378 |
delete *iData;
|
williamr@2
|
379 |
*iData = NULL;
|
williamr@2
|
380 |
}
|
williamr@2
|
381 |
return KErrNone;
|
williamr@2
|
382 |
}
|
williamr@2
|
383 |
|
williamr@2
|
384 |
if (*iData == NULL)
|
williamr@2
|
385 |
{
|
williamr@2
|
386 |
TRAPD(ret, *iData = reinterpret_cast<TYPE*>(TYPE::LoadL(aBuffer)));
|
williamr@2
|
387 |
return ret;
|
williamr@2
|
388 |
}
|
williamr@2
|
389 |
else
|
williamr@2
|
390 |
{
|
williamr@2
|
391 |
return (*iData)->Load(aBuffer);
|
williamr@2
|
392 |
}
|
williamr@2
|
393 |
}
|
williamr@2
|
394 |
|
williamr@2
|
395 |
template<class TYPE>
|
williamr@2
|
396 |
TInt TMetaPtr<TYPE>::Store(TDes8& aBuffer) const
|
williamr@2
|
397 |
/**
|
williamr@2
|
398 |
* Stores content of a meta object (in iData) to a descriptor
|
williamr@2
|
399 |
*/
|
williamr@2
|
400 |
{
|
williamr@2
|
401 |
if (*iData == NULL)
|
williamr@2
|
402 |
{
|
williamr@2
|
403 |
const TUint32 KNullInt = 0;
|
williamr@2
|
404 |
aBuffer.Append((TUint8*)&KNullInt, sizeof(TUint32));
|
williamr@2
|
405 |
return KErrNone;
|
williamr@2
|
406 |
}
|
williamr@2
|
407 |
else
|
williamr@2
|
408 |
{
|
williamr@2
|
409 |
return (*iData)->Store(aBuffer);
|
williamr@2
|
410 |
}
|
williamr@2
|
411 |
}
|
williamr@2
|
412 |
|
williamr@2
|
413 |
template<class TYPE>
|
williamr@2
|
414 |
void TMetaPtr<TYPE>::Copy(const TAny* aData)
|
williamr@2
|
415 |
/**
|
williamr@2
|
416 |
* Copies content of a meta object (in aData) into another meta object (in iData).
|
williamr@2
|
417 |
*/
|
williamr@2
|
418 |
{
|
williamr@2
|
419 |
(*iData)->Copy(*((TYPE*)aData));
|
williamr@2
|
420 |
}
|
williamr@2
|
421 |
|
williamr@2
|
422 |
template<class TYPE>
|
williamr@2
|
423 |
TInt TMetaPtr<TYPE>::Length() const
|
williamr@2
|
424 |
/**
|
williamr@2
|
425 |
* Returns the length of the handled meta object.
|
williamr@2
|
426 |
*/
|
williamr@2
|
427 |
{
|
williamr@2
|
428 |
if (*iData == NULL)
|
williamr@2
|
429 |
{
|
williamr@2
|
430 |
// Add length of null word (Used to represent a NULL pointer)
|
williamr@2
|
431 |
return sizeof(TUint32);
|
williamr@2
|
432 |
}
|
williamr@2
|
433 |
else
|
williamr@2
|
434 |
{
|
williamr@2
|
435 |
return (*iData)->Length();
|
williamr@2
|
436 |
}
|
williamr@2
|
437 |
}
|
williamr@2
|
438 |
|
williamr@2
|
439 |
} //namespace Meta
|
williamr@2
|
440 |
|
williamr@2
|
441 |
|
williamr@2
|
442 |
#endif //METATYPE_H
|