// Copyright (c) 2008-2009 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:

 //

 #include <e32std.h>

 #include "SqlSrvStrings.h"

 _LIT(KCreateSql, "CREATE");

 _LIT(KIndexSql,  "INDEX");

 _LIT(KIfSql,     "IF");

 _LIT(KNotSql,    "NOT");

 _LIT(KExistsSql, "EXISTS");

 _LIT(KDotSql,    ".");

 /**

 Determines whether the specified string is an SQL statement that is supported as a config operation.

 Currently only 'CREATE INDEX' SQL statements are supported. If necessary adds qualifyed DB name  to index name.

 @param aStatementIn The string to be checked to determine if it is a supported SQL statement

 @param aDbName Logical database name: "main" for the main database or attached database name

 @param aStatementOut Output parameter. Buffer for the constructed statement (if the statement is supported).

 @return True if the aStatementIn statement is supported, aStatementOut will contain the zero-terminated

 		aStatementIn statement with the database name in it, if aDbName is a name of an attached database

 */	

 TBool IsStatementSupported(const TDesC& aStatementIn, const TDesC& aDbName, TDes& aStatementOut)

 	{	

 	//'CREATE INDEX' is the only statement currently supported.

 	//We must allow for whitespace between the 'CREATE' and the 'INDEX'

 	TLex stmtParser(aStatementIn);

 	TPtrC firstToken = stmtParser.NextToken(); // extract the first token of the statement

 	if(firstToken.CompareF(KCreateSql()) != 0)

 		{

 		return EFalse;	

 		}

 	//The first token is 'CREATE', now skip any whitespace between 

 	//it and the next token and ensure that the next token is 'INDEX'

 	TPtrC secondToken = stmtParser.NextToken(); // skip any whitespace and extract the next token

 	if(secondToken.CompareF(KIndexSql()) != 0)

 		{

 		return EFalse;	

 		}

 	//The second token is 'INDEX'

 	TPtrC curToken = stmtParser.NextToken();

 	// skip optional [IF NOT EXISTS]

 	if(curToken.CompareF(KIfSql()) == 0)

 		{

 		curToken.Set(stmtParser.NextToken());

 		if(curToken.CompareF(KNotSql()) != 0)

 			{

 			return EFalse;	

 			}

 		curToken.Set(stmtParser.NextToken());

 		if(curToken.CompareF(KExistsSql()) != 0)

 			{

 			return EFalse;	

 			}

 		curToken.Set(stmtParser.NextToken());

 		}

 	// we got '[database-name.]index-name'

 	if(curToken.Find(KDotSql)==KErrNotFound && aDbName.CompareF(KMainDb16) != 0) // just index-name

 		{

 		// Add DB name prefix before table name in the case of CREATE INDEX

 		aStatementOut.Copy(aStatementIn.Ptr(), curToken.Ptr()-aStatementIn.Ptr());

 		aStatementOut.Append(aDbName);

 		aStatementOut.Append(KDotSql);

 		aStatementOut.Append(curToken);

 		aStatementOut.Append(stmtParser.Remainder());

 		}

 	else

 		{

 		aStatementOut.Copy(aStatementIn);

 		}

 	aStatementOut.Append(TChar(0)); // SQLite requires statements to be zero-terminated

 	return ETrue;

 	}