examples/SFExamples/Wikipedia/inc/WikiDb.h

// 
// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of the License "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:
// 


#ifndef __WIKI_DB_H__
#define __WIKI_DB_H__

#include <e32std.h>
#include <SqlDb.h>
#include <UTF.h>

const TInt KMaxCharByCharSqlQueryLen = 1024;
const TInt KMaxCharByCharQueryLen = 128;
const TInt KMaxArticleTextLen = 32768;
const TInt KItemsPerPage = 6;

#ifdef __WINS__
_LIT(KSqlDbName, "C:\\Wikipedia\\wikipedia.db");
#else
_LIT(KSqlDbName, "e:\\Wikipedia\\wikipedia.db");
#endif

_LIT8(KSqlDbConfig, "");
_LIT8(KWikiSqlStmtGetArticle, "select content, links from pages where title='%S'");
_LIT8(KWikiSqlStmtJustTitle, "select title from pages where title like '%S%%' order by title");
_LIT8(KWikiSqlStmtTitleOffset, "select title from pages where title like '%S%%' order by title limit -1 offset %D");

_LIT8(KCountAll, "select sum(count) from countHelper1");
_LIT8(KCountWith1Char, "select count from countHelper1 where prefix='%S'");
_LIT8(KCountWith2Chars, "select sum(count) from countHelper3 where prefix like '%S%%'");
_LIT8(KCountWith3Chars, "select count from countHelper3 where prefix='%S'");
_LIT8(KCountWith4Chars, "select sum(count) from countHelper5 where prefix like '%S%%'");
_LIT8(KCountWith5Chars, "select count from countHelper5 where prefix='%S'");
_LIT8(KCountWithManyChars, "select count(*) from pages where title like '%S%%'");

_LIT8(KTitleFormat, "<h2>%S</h2>");
_LIT8(KHtmlParagpraph, "<p>");
_LIT8(KLinkFormat, "<a href=\"http://en.wikipedia.org/wiki/%S#%S\">%S</a><br>");
_LIT8(KFullArticleLinkFormat, "<p><a href=\"http://en.wikipedia.org/wiki/%S\">Full article</a><p>");

enum TRequestCode 
        {
        ECancel,
        ERecordCount,
        ERecordCountNext
        };

enum TPageState
        {
        EInitialise,
        EPageUp,
        ENextItem
        };

class MWikiCountObserver
    {
    public:

                virtual void CountUpdatedL( TInt aError ) = 0;
        };

class CWikiDb : public CActive 
        {
    public: // Constructor and destructor

                static CWikiDb* NewL();
        
                ~CWikiDb();     


        private: // Constructors

                CWikiDb();
        
                void ConstructL();
        
        public:
        
        // prepares the statements...
        void SearchL(const TDesC& aPrefix, MWikiCountObserver* aObserver);
        
        void PageUpL( const TDesC& aPrefix );
        
        TBool Next();
        
        const TInt GetTitle(TPtrC& aTitle);
        
        const TDesC8& GetArticleContentL();

        
        const TDesC8& GetArticleContentL(const TDesC& aTitle);

        const TDesC8& GetArticleContentL(const TDesC8& aTitle);

        void SetCurrentArticleL( const TDesC& aTitle );

        const TDesC8& GetCurrentArticleContentL();
        
        TBool DoesNextItemExist();
        
        TInt CurrentPage() { return iCurPage; };
        TInt CurrentItem() { return iCurItem; };        
        TInt NumRecords() { return iNumRecords; };
        
        public: // from CActive
        void DoCancel();
        void RunL();
        
        private:
        void EnsureArticleFormattedL(const TDesC& aTitle);
        void EnsureArticleFormattedL(const TDesC8& aTitle);
        void ReplaceChar(const TDesC8& aSource, TDes8& aTarget, const TChar& aToReplace, const TChar& aReplacement);
        void RunQueryL();
        void RunRecCountQueryL();       
        void SetPageAndItemL( const TPageState aPageState );
        HBufC* EscapeL( const TDesC& aQuery) const;
        HBufC8* EscapeL( const TDesC8& aQuery) const;
        void StartRecordCountL();
        void TraverseRecCountL();

        protected:
        
        RSqlDatabase iDatabase;
        RSqlStatement iStatement;
        RSqlStatement iCountStatement;
        RBuf8 iQueryBuf;
        RBuf8 iCountBuf;
        RBuf8 iUtf8Chars;
        RBuf8 iArticleText;
        HBufC* iCurArticleTitle;
        MWikiCountObserver* iObserver;
        
        protected:
        TRequestCode            iRequestCode;
        TRequestStatus*         iRequestStatus;
        RBuf8                           iRequestTitle;
        TPtrC8*                         iRequestBuffer;
        
        TInt                            iCurItem;
        TInt                            iCurPage;
        TBool                           iAtNextItem;
        TInt                            iNumRecords;
        };
        
#endif //__WIKI_DB_H__

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