persistentstorage/dbms/security/SC_Policy.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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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 "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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// CPolicyBase, CDbPolicy, CTblPolicy, CPolicyDomain, 
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// TPolicyDomainBuilder, TPolicyDomainReader classes.
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// MPolicyDomainPersister, MPolicyDomainLoader interfaces
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// 
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//
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#ifndef __SC_POLICY_H__
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#define __SC_POLICY_H__
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#include <e32base.h>		//CBase
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#include "D32Security.h"
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namespace DBSC
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{
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//Forward declarations
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class CPolicyDomain;
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/**
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CPolicyBase class implements MPolicy interface.
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It describes an object that manages a set of TSecurityPolicy objects.
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CPolicyBase::iPOType data member gives an information access to what kind of 
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database object (database or table) is controlled by the set of security policies.
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CPolicyBase::Check() can be used to check caller access rights against specified policy type.
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@see MPolicy
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@internalComponent
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*/
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NONSHARABLE_CLASS(CPolicyBase) : public CBase, public MPolicy
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	{
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public:
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	struct TPolicy
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		{
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		TPolicyType		iType;
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		TSecurityPolicy	iData;
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		};
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	typedef RArray<TPolicy> RPolicyCollection;
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	typedef enum {EPCNotFound, EPCPassed, EPCNotPassed} TPolicyCheckResult;
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public:
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	virtual ~CPolicyBase();
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	virtual TBool Check(const RMessage2& aMessage, TPolicyType aPolicyType) const = 0; 
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	virtual TInt Get(TPolicyType aPolicyType, TSecurityPolicy& aPolicy) const;
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	virtual void InvariantL() const;
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	DECLARE_DB_INVARIANT()
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	inline const RPolicyCollection& PolicyCollection() const;
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protected:
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	inline CPolicyBase();
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	void ConstructL(const RPolicyCollection& aPolicyCollection);
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	const TSecurityPolicy* Policy(TPolicyType aPolicyType) const;
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	TPolicyCheckResult DoCheck(const RMessage2& aMessage, TPolicyType aPolicyType) const; 
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	DECLARE_DB_DUMP2(aFile)
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private:
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	RPolicyCollection	iPolicyCollection;
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	};
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/**
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CDbPolicy class describes an object that manages the access to all databases, which
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have the same format UID.
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@see CPolicyBase
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@see MPolicy
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@internalComponent
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*/
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NONSHARABLE_CLASS(CDbPolicy) : public CPolicyBase
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	{
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public:
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	static CDbPolicy* NewLC(const RPolicyCollection& aPolicyCollection);
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	inline static CDbPolicy* NewL(const RPolicyCollection& aPolicyCollection);
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	virtual ~CDbPolicy();
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	virtual TBool Check(const RMessage2& aMessage, TPolicyType aPolicyType) const; 
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	virtual void InvariantL() const;
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	DECLARE_DB_DUMP2(aFile)
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private:
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	inline CDbPolicy();
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	};
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/**
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CTblPolicy class describes an object that manages the access to all tables, which
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have particular format UID and particular name.
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@see CPolicyBase
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@see MPolicy
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@internalComponent
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*/
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NONSHARABLE_CLASS(CTblPolicy) : public CPolicyBase
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	{
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public:
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	static CTblPolicy* NewLC(const TDesC& aTblName, 
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							 const RPolicyCollection& aPolicyCollection,
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							 const CDbPolicy* aDbPolicy);
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	inline static CTblPolicy* NewL(const TDesC& aTblName, 
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								   const RPolicyCollection& aPolicyCollection,
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								   const CDbPolicy* aDbPolicy);
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	virtual ~CTblPolicy();
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	virtual TBool Check(const RMessage2& aMessage, TPolicyType aPolicyType) const; 
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	virtual TInt Get(TPolicyType aPolicyType, TSecurityPolicy& aPolicy) const;
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	virtual void InvariantL() const;
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	inline const TDesC& TableName() const;
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	DECLARE_DB_DUMP2(aFile)
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private:
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	inline CTblPolicy(const CDbPolicy* aDbPolicy);
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	void ConstructL(const TDesC& aTblName, const RPolicyCollection& aPolicyCollection);
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private:
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	HBufC*	iTblName;
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	const CDbPolicy* iDbPolicy;
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	};
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/**
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TPolicyDomainBuilder class describes an object that can be used during the initialization
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to initialize CPolicyDomain objects. It is used by MPolicyDomainLoader interface.
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@internalComponent
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*/
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class TPolicyDomainBuilder
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	{
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public:
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	inline TPolicyDomainBuilder(CPolicyDomain& aPolicyDomain);
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	void SetDbPolicyL(CDbPolicy* aDbPolicy);
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	inline void AddTblPolicyL(CTblPolicy* aTblPolicy);
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	inline void SetBackupSID(TSecureId& aSecureId);
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private:
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	CPolicyDomain&	iPolicyDomain;
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	};
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/**
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TPolicyDomainBuilder class describes an object that can be used to explore the content of
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CPolicyDomain objects. It is used by MPolicyDomainPersister interface.
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@internalComponent
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*/
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class TPolicyDomainReader
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	{
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public:
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	inline TPolicyDomainReader(const CPolicyDomain& aPolicyDomain);
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	inline TUid Uid() const;
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	inline const CDbPolicy& DbPolicy() const;
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	inline void ResetTblPos() const;
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	inline TInt TblPolicyCount() const;
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	inline const CTblPolicy* NextTblPolicy() const;
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	inline TSecureId BackupSID() const;
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private:
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	const CPolicyDomain&	iPolicyDomain;
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	mutable TInt			iIndex;
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	};
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/**
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MPolicyDomainPersister interface has to be implemented by DBSC clients, who want to store
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the information from CPolicyDomain objects (set of security policies) somewhere - text files,
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streams, ... It uses TPolicyDomainReader class to traverse CPolicyDomain collection of
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security policies.
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@see TPolicyDomainReader
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@internalComponent
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*/
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class MPolicyDomainPersister
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	{
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public:
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	virtual void RunL(const TPolicyDomainReader& aPolicyDomainReader) = 0;
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	};
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/**
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MPolicyDomainPersister interface has to be implemented by DBSC clients, who want to load
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set of security policies to CPolicyDomain objects from somewhere - text files,
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streams, ... It uses TPolicyDomainBuilder class to add to CPolicyDomain collection new
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security policies.
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@see TPolicyDomainBuilder
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@internalComponent
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*/
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class MPolicyDomainLoader
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	{
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public:
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	virtual void RunL(TPolicyDomainBuilder& aPolicyDomainBuilder) = 0;
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	};
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/**
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CPolicyDomain object describes a set of all security policies related to particular format UID.
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It describes only a collection of security policies and offers some functionality for
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retrieving particular database/table MPolicy interfaces.
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The responsibility for adding new items to secirity policy collection is delegated to 
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TPolicyDomainBuilder class.
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The responsibility for traversing secirity policy collection is delegated to 
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TPolicyDomainReader class.
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Both, TPolicyDomainBuilder and TPolicyDomainReader classes are not used directly by 
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the CPolicyDomain class implementation. CPolicyDomain instances are created using 
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MPolicyDomainLoader interface and externalized using MPolicyDomainPersister interface and
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they (the interfaces) use TPolicyDomainBuilder and TPolicyDomainReader respectively.
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The delegation of responsibilities for creation/traversing of CPolicyDomain security policy collection
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was done because CPolicyDomain class is a part of shared sources used in DBMS server implementation
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and DbSpConv tool implementation.
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DBMS server creates CPolicyDomain security policy collection from a binary policy files using
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TPDStreamLoader class (which implements MPolicyDomainLoader) and TPolicyDomainBuilder class
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to insert created CDbPolicy and CTblPolicy instances into CPolicyDomain collection.
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The rest of the possibilities: creating CPolicyDomain collection from a text policy file,
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exporting CPolicyDomain collection to a binary policy file, 
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exporting CPolicyDomain collection to a text policy file, are used by the DbSpConv tool.
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So, CPolicyDomain class uses interfaces for its loading/storing, but their 
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implementations are part of separate exe-s - no waste of production code.
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@see MPolicy
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@see CDbPolicy
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@see CTblPolicy
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@see TPolicyDomainBuilder
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@see TPolicyDomainReader
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@see MPolicyDomainLoader
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@see MPolicyDomainPersister
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@internalComponent
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*/
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NONSHARABLE_CLASS(CPolicyDomain) : public CBase
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	{
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	friend class TPolicyDomainBuilder;
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	friend class TPolicyDomainReader;
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public:
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	static CPolicyDomain* NewLC(TUid aUid, MPolicyDomainLoader& aPDLoader);
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	inline static CPolicyDomain* NewL(TUid aUid, MPolicyDomainLoader& aPDLoader);
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	virtual ~CPolicyDomain();
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	void ExternalizeL(MPolicyDomainPersister& aPDPersister) const;
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	inline TUid Uid() const;
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	const MPolicy* DbPolicy() const;
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	const MPolicy* TblPolicy(const TDesC& aTblName) const;
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	inline TSecureId BackupSID() const;
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	virtual void InvariantL() const;
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	DECLARE_DB_DUMP3(aFile)
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private:
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	inline CPolicyDomain(TUid aUid);
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	void InternalizeL(MPolicyDomainLoader& aPDLoader);
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	void Destroy();
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	DECLARE_DB_INVARIANT2()
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private:
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	TUid						iUid;
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	CDbPolicy*					iDbPolicy;
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	RPointerArray<CTblPolicy>	iTPCollection;
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	TSecureId 					iBackupSID;
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	};
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} //end of - namespace DBSC
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#include "SC_Policy.inl"
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#endif//__SC_POLICY_H__