/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   XDM Document

*

*/

#ifndef __XDMDOCUMENT__

#define __XDMDOCUMENT__

#include <e32cmn.h>

#include <e32base.h>

#include <XdmNamespaceContainer.h>

//The supported document types = application usages

enum TXdmDocType

    {

    EXdmDocGeneral = 0,

    EXdmTestDocType,

    EXdmPoCGroup,

    EXdmPoCUserAccessPolicy,

    EXdmDirectory,

    EXdmCapabilities,

    EXdmSharedXdm,

    EXdmRlsServices,

    EXdmResourceLists,

    EXdmIetfCommonPolicy,

    EXdmOmaCommonPolicy,

    EXdmIetfPresenceRules,

    };

//Helper class for searching documents; 16-bit 

struct SXdmAttribute16

    {

    TPtrC iName;

    TPtrC iValue;

    };

//Helper class for searching documents; 8-bit

struct SXdmAttribute8

    {

    TPtrC8 iName;

    TPtrC8 iValue;

    };

//Constants

const TInt KXdmPathSeparatorChar                       = 47;

//Forward declarations    

class CXdmEngine;

class MXdmOperation;

class CXdmDocumentNode;

class CXdmNodeAttribute;

class CXdmOperationFactory;

// CLASS DECLARATION

class CXdmDocument : public CActive,

                     public MXdmNamespaceContainer

    {

    public:  // Constructors and destructor

        /**

        * Returns the name of this document

		* @return TPtrC The name of the document this object models 

        */

        IMPORT_C TPtrC Name() const;

        /**

        * Fetch data from the document this object models beginning from the 

        * element the parameter points to. If the parameter is not specified,

        * the operation applies to the whole of the document.

        *

        * @param CXdmDocumentNode* The element (including its descendants) to fetch.

		* @return void

        */

        IMPORT_C void FetchDataL( CXdmDocumentNode* aDocNode = NULL );

        /**

        * Replace the document this object models

        * 

        * NOTE: The name of the document MUST remain the same. This is because

        *       the operation first needs to delete the old document and then

        *       store the new one. The risk of creating conflicting document

        *       names is far too great in case this rule is not imposed.

        *

		* @return void 

        */

        IMPORT_C void ReplaceL();

        /**

        * Replace a named element in the document this object models

        *

        * NOTE: Both elements MUST have a common parent element,

        *       which, in effect, must be the element this document

        *       model points to. Also note that the operation will

        *       fail in case the "aOldNode" does not exist in the document.

        *

        * @param CXdmDocumentNode* The element to replace

        * @param CXdmDocumentNode* The replacing element

		* @return void 

        */

        IMPORT_C void ReplaceL( CXdmDocumentNode* aOldNode,

                                CXdmDocumentNode* aNewNode );

        /**

        * Insert the node identified by the parameter. Note that this

        * method cannot be applied to complete documents. Thus the method

        * will fail in case the parameter is NULL. If the client needs

        * to a) add b) replace a document, it needs to do this through

        * the AppendL() or the ReplaceL() method.

        *

        * NOTE: The operation will fail in case the element identified

        *       by the aDocNode parameter already exists in the document.

        *       XDM Engine does not make assumptions in this regard; it

        *       does not, for instance, change some aspects of the 

        *       request in order to turn it into a valid insert operation.

        *       Instead, it will re-read the whole document and retry the

        *       insert operation. If the operation still fails, the engine

        *       reports the failure that occurred while performing the

        *       operation. In the latter case, the client can get a hold

        *       of the error report document, provided that the used

        *       protocol supports the feature and that the server included

        *       the document in the response, by fetching the root node of

        *       the error document through ErrorRoot() method.

        *       

        * @param CXdmDocumentNode* The element (including its descendants) to insert

		* @return void 

        */

        IMPORT_C void InsertL( CXdmDocumentNode* aDocNode );

        /**

        * Append data to the document this object models beginning from the 

        * element the parameter points to. If the parameter is not specified,

        * the operation applies to the whole of the document.

        *

        * NOTE: This is a "blind insert"; no guarantees can be given

        *       as to the success or failure of the operation, since

        *       it includes no checking for existence of the resource

        *       that is to be appended/inserted. It is also worth noticing

        *       that this method may effectively turn into a replace

        *       operation in case the method is invoked on a document that

        *       already exists in the storage endpoint.

        *

        * @param CXdmDocumentNode* The element (including its descendants) to append.

		* @return void

        */

        IMPORT_C void AppendL( CXdmDocumentNode* aDocNode = NULL );

        /**

        * Delete data from the document this object models beginning from the 

        * element the parameter points to. If the parameter is not specified,

        * the operation applies to the whole of the document.

        *

        * @param CXdmDocumentNode* The element (including its descendants) to delete.

		* @return void 

        */

        IMPORT_C void DeleteDataL( CXdmDocumentNode* aDocNode = NULL );

        /**

        * Search for nodes which match the specified name & attributes

        *

        * @param CXdmDocumentNode& The node to search for

        * @param RPointerArray& On completion, contains the nodes

        *                       that were found, if any.

		* @return TInt KErrNotFound if no matching nodes are found.

		*              Otherwise indicates the number of nodes found

        */

        IMPORT_C TInt Find( const CXdmDocumentNode& aTargetNode,

                            RPointerArray<CXdmDocumentNode>& aResultArray ) const;

        /**

        * Search for nodes which match the specified name & attributes

        *

        * @param TDesC& The name of the node to search for

        * @param RPointerArray& On completion, contains the nodes

        *                       that were found, if any.

		* @return TInt KErrNotFound if no matching nodes are found.

		*              Otherwise indicates the number of nodes found

        */

        IMPORT_C TInt Find( const TDesC& aNodeName,

                            RPointerArray<CXdmDocumentNode>& aResultArray ) const;

        /**

        * Search for attributes which match the specified name

        *

        * @param TDesC& The name of the attribute to search for

        * @param RPointerArray& On completion, contains the nodes

        *                       that were found, if any.

		* @return TInt KErrNotFound if no matching nodes are found.

		*              Otherwise indicates the number of nodes found

        */

        IMPORT_C TInt Find( const TDesC& aAttributeName,

                            RPointerArray<CXdmNodeAttribute>& aResultArray ) const;

        /**

        * Search for nodes which match the specified name & attributes

        *

        * @param TDesC& The name of the node to search for

        * @param RPointerArray& On completion, contains the nodes

        *                       that were found, if any.

        * @param RPointerArray& The attribute names & values that a

                                matching node must have.

		* @return TInt KErrNotFound if no matching nodes are found.

		*              Otherwise indicates the number of nodes found

        */

        IMPORT_C TInt Find( const TDesC& aNodeName,

                            RPointerArray<CXdmDocumentNode>& aResultArray,

                            const RPointerArray<SXdmAttribute16>& aAttributeArray ) const;

        /**

        * Comparison operator

        *

        * @param CXdmDocument& The document to compare to

		* @return TBool Are the contents of the two identical

        */

        IMPORT_C TBool operator==( CXdmDocument& aDocument ) const;

        /**

        * Remove an element from the document model

        *

        * NOTE: This method cannot be used with document models that

        *       only target a fragment of the document; in practise

        *       this means that if the client has constructed a node

        *       using DocumentSubsetL(), this method leaves with KErrGeneral.

        *       A document subset cannot be treated as an actual document

        *       since only a fraction of the elements and their dependencies

        *       in the document is known. The client must have the whole 

        *       document at its disposal in order to be properly able to

        *       make use of this method.

        *

        * @param CXdmDocumentNode* The node to be removed

		* @return void 

        */

        IMPORT_C void RemoveFromModelL( CXdmDocumentNode* aChileNode );

        /**

        * Append an element to the document model

        *

        * NOTE: This method cannot be used with document models that

        *       only target a fragment of the document; in practise

        *       this means that if the client has constructed a node

        *       using DocumentSubsetL(), this method leaves with KErrGeneral.

        *       A document subset cannot be treated as an actual document

        *       since only a fraction of the elements and their dependencies

        *       in the document is known. The client must have the whole 

        *       document at its disposal in order to be properly able to

        *       make use of this method.

        *

        * @param The next node in the list

		* @return void 

        */

        IMPORT_C void AppendToModelL( CXdmDocumentNode* aNewNode,

                                      CXdmDocumentNode* aParentNode );

        /**

        * Replace an element in the document model

        *

        * NOTE: This method cannot be used with document models that

        *       only target a fragment of the document; in practise

        *       this means that if the client has constructed a node

        *       using DocumentSubsetL(), this method leaves with KErrGeneral.

        *       A document subset cannot be treated as an actual document

        *       since only a fraction of the elements and their dependencies

        *       in the document is known. The client must have the whole 

        *       document at its disposal in order to be properly able to

        *       make use of this method.

        *

        * @param CXdmDocumentNode The new node

        * @param CXdmDocumentNode The old (target) node

		* @return void 

        */

        IMPORT_C void ReplaceInModelL( CXdmDocumentNode* aNewNode,

                                       CXdmDocumentNode* aTargetNode );

        /**

        * Return a subset of the document this object models. 

        * For instance, if the whole (physical) document is

        * the following:

        *

        * <root>

        *   <element1>

        *     <child1>

        *       <leaf1>Foo</leaf1>

        *     </child1>

        *   </element1>

        * </root>

        *

        * calling this method with the parameter "root/element1/child1"

        * would make this document model model the subset

        * 

        * <child1>

        *   <leaf1>Foo</leaf1>

        * </child1>

        *

        * It is important to understand that, after calling this method,

        * the document model only models the document starting from the 

        * node the method returns. The client may traverse the document

        * all the way to the root node and back, but the way from the root

        * node to the node this method returns should be regarded merely

        * as a "path" of elements that has no real content.

        *

        * A prime use case for this method is one in which the structure

        * of the document the client application wants to operate on is

        * well-known; a typical example would be an XDM directory document.

        * The schema for this application usage is very simple: the root

        * element is <xcap-directory> that has a collection of <folder>

        * elements as its children. Each <folder> element has a mandatory

        * "auid" parameter that identifies the type of documents that

        * particular folder contains. Therefore, a client application has

        * all the necessary information it needs to have in order to be

        * able to carry out a fetch for a document subset (one folder):

        *

        * _LIT( KNodePath, "xcap-directory/folder" );

        * CXdmDocumentNode* node = iDirectoryDoc->DocumentSubsetL( KNodePath );

        * CleanupStack::PushL( node );

        * CXdmNodeAttribute* auid = node->CreateAttributeL( _L( "auid" ) );

        * CleanupStack::PushL( auid );

        * auid->SetAttributeValueL( _L( "My document type" ) );

        * iDirectoryDoc->FetchDataL( node );

        * CleanupStack::Pop( 2 );  //auid, node

        *

        * In this particular case, even after the fetch operation is

        * complete, the <xcap-directory> element in this document model

        * would not be a real element, a genuine part of the document, but,

        * rather, a "virtual" node on the way to the element that is of

        * real interest to the client application.

        *

        * Also note that the instance of CXdmDocument on which this subset

        * has been created, cannot be used as a container for a whole

        * document until ResetSubset() has been called.

        *

        * The incoming parameter MUST separate each step to the

        * target element with a slash character ('/'). 

        *

        * @param TDesC8& The path to the target element

		* @return CXdmDocumentNode* 

        */

        IMPORT_C CXdmDocumentNode* DocumentSubsetL( const TDesC& aNodePath );

        /*

        * Reset the document subset.

        * 

        * See the comments to DocumentSubsetL method for details.

        * @return void

        */

        IMPORT_C virtual void ResetSubset();

        /**

        * Destructor.

        */

        IMPORT_C ~CXdmDocument();

    public: // New functions

        /**

        * Return the type of this document

        *

        * @return TXdmDocType The type of the document

        */

        virtual TXdmDocType DocumentType() const = 0;

        /**

        * Construct an "anonymous" entry point for this document.

        * This node effectively becomes the root of this document.

        *

        * @return CXdmDocumentNode* Document root

        */

        virtual CXdmDocumentNode* CreateRootL() = 0;

        /**

        * Return the root element of this document

        *

        * NOTE: The returning node may or may not contain any data,

        *       since, in the case that this document model does not

        *       have content yet, the element is a simple "entry point"

        *       to the whole document. Thus, for instance, if the client

        *       application requests the XDM Engine to fetch a particular

        *       document, the root element points to nothing until the 

        *       request has been completed.

        *       

        *       Also note that in case the client has created a document

        *       subset using the DocumentSubsetL() method, this method 

        *       will return NULL, since the document is not traversable 

        *       from the root; it, by definition, represents only a subset

        *       of this document. In case of a document subset, the path from

        *       the root node to the target node should be considered a simple

        *       linked list that does not necessarily contain all children

        *       for any of the nodes in between.

		*

        * @return CXdmDocumentNode* The root element of the document   

        */

        virtual CXdmDocumentNode* DocumentRoot() const = 0;

        /*

        * Reset the contents of this document model.

        * 

        * This method comes into play when client wants to reuse an instance

        * of this class for, for instance, construction of different content.

        * Other properties, such as name and the type of the document

        * do not change.

        *

        * @return void

        */

        virtual void ResetContents() = 0;

        /**

        * Return the currently last node in the path. 

        * NOTE: Only works with document subsets!

        *

        * @return CXdmDocumentNode*

        */

        virtual CXdmDocumentNode* CurrentExtent() const = 0;

        /**

        * Return the time stamp for this document

        *

		* @return TTime Time stamp

        */

        virtual TTime TimeStamp() const = 0;

        /**

        * Return an error document for a failed update

        * 

        * NOTE: The returning object will be zero in case

        *       the used protocol does not support this feature.

        *

		* @return CXdmDocument* The error document

        */

        virtual CXdmDocumentNode* ErrorRoot() = 0;

    protected:

        /**

        * Append an element to the path identifying the 

        * the current document subset

        *

        * @param TDesC& The path part to append

        * @return void

        */

        virtual void AppendPathPartL( const TDesC& aString ) = 0;

    private:

        /**

        * Empty the operation queue

        */

        void EmptyOperationQueue();

        /**

        * Find attributes by name

        *

        * @param CXdmDocumentNode* The node to search from

        * @param TDesC& The name of the attributes to search for

        * @param RPointerArray& On completion, contains the results

		* @return TInt The number of attributes found 

        */

        TInt DoFindAttributes( CXdmDocumentNode* aNode,

							   const TDesC& aAttributeName,

                               RPointerArray<CXdmNodeAttribute>& aResultArray ) const;

    private:  //Methods which need to be accessible from the CXdmEngine

              //but NOT from the client application => friend class

        /**

        * Start updating the document

        * @param TRequestStatus& The status of the request

		* @return void 

        */

        virtual void StartUpdateL() = 0;

        /**

        * Cancel a document update

        * @param TRequestStatus& The status of the request

		* @return void 

        */

        virtual void CancelUpdate() = 0;

        /**

        * Save the client's request status

        * @param TRequestStatus& The status of the request

		* @return void 

        */

        virtual void SaveClientStatus( TRequestStatus& aClientStatus ) = 0;

    protected:

        /**

        * By default Symbian OS constructor is private.

        * @return void

        */

        IMPORT_C void BaseConstructL( TInt aOperationFactoryUid,

                                      const TDesC& aDocumentName );

        /**

        * By default Symbian OS constructor is private.

        * @return void

        */

        IMPORT_C void BaseConstructL( TInt aOperationFactoryUid,

                                      const TDesC8& aDocumentName );

        /**

        * C++ constructor is private.

        */

		IMPORT_C CXdmDocument( CXdmEngine& aXdmEngine );

    protected:   //Data

        TBool                                   iDocSubset;

        HBufC*                                  iDocumentName;

        TRequestStatus*                         iClientStatus;

        TTime                                   iTimeStamp;

        CXdmEngine&                             iXdmEngine;

        friend class                            CXdmEngine;

        RPointerArray<MXdmOperation>            iChangeRequests;