author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:19 +0100 | |
branch | RCL_3 |
changeset 20 | d48ab3b357f1 |
parent 0 | 2f259fa3e83a |
permissions | -rw-r--r-- |
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// Copyright (c) 1997-2009 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 "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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#include <coemop.h> |
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/** Safety check to avoid loops in the Mop chain. |
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*/ |
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MObjectProvider* MObjectProvider::FindParent(MObjectProvider* aMopToFind) |
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{ |
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MObjectProvider* mop = this; |
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while (mop && mop!= aMopToFind) |
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{ |
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mop = mop->MopNext(); |
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} |
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return mop; |
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} |
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/** Gets the parent object provider. |
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|
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This is called by the private function MopGetById() when a call to |
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MopGetObject() returns NULL. |
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The default implementation returns NULL. Note that care must be taken |
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to avoid infinite loops. For example, returning a pointer, either |
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directly or indirectly, to this same object provider. |
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@return A pointer to the parent object provider, or NULL if there is none. |
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@publishedAll |
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@released */ |
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EXPORT_C MObjectProvider* MObjectProvider::MopNext() |
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{ |
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return NULL; |
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} |
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/** Gets an object of a type identified by the specified TTypeUid object. |
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Although private, the implementation tries to find a suitable object through |
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a call to MopSupplyObject(). If this returns NULL, it calls MopNext() to find |
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a parent object provider, and then recursively calls MopGetById(), until an object |
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is found, or no further parents can be found. |
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Note that we should preserve Binary Compatibility for this function because it |
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is called by the publishedAll inline function MObjectProvider::MopGetObject(). |
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@param aId A unique identifier which identifies the type of object required. |
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@return The owned object of the given type ID. If no owned object of the given |
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type ID exists, NULL is returned. |
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@internalComponent */ |
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EXPORT_C TAny* MObjectProvider::MopGetById(TTypeUid aId) |
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{ |
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TAny* obj = MopSupplyObject(aId).Pointer(); |
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if (obj) |
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return obj; |
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MObjectProvider* next = MopNext(); |
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if (next) |
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return next->MopGetById(aId); |
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return NULL; |
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} |
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/** Gets an object of a type identified by the specified TTypeUid object. It does not |
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recurse through the object provider chain to find the object required. If this object |
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cannot provide it then it returns NULL. |
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Although private, the implementation tries to find a suitable object through |
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a call to MopSupplyObject(), and if this returns NULL, this function returns NULL. |
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Note that we should preserve Binary Compatibility for this function because it |
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is called by the publishedAll inline function MObjectProvider::MopGetObjectNoChaining(). |
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@param aId A unique identifier which identifies the type of object required. |
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@return The owned object of the given type ID. If no owned object of the given |
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type ID exists, NULL is returned. |
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@internalComponent */ |
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EXPORT_C TAny* MObjectProvider::MopGetByIdNoChaining(TTypeUid aId) |
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{ |
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TAny* obj = MopSupplyObject(aId).Pointer(); |
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return obj; |
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} |
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EXPORT_C MObjectProvider::MObjectProvider() |
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{ |
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} |
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EXPORT_C void MObjectProvider::MObjectProvider_Reserved1() |
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{ |
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} |
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EXPORT_C void MObjectProvider::MObjectProvider_Reserved2() |
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{ |
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