persistentstorage/sql/SRC/Server/SqlSrvCollation.cpp
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) 2006-2009 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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// SqlSrvStatementCollation.cpp
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// 
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//
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#include "SqlSrvCollation.h"
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#include "SqlPanic.h"
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#include "SqlUtil.h"
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#include "sqlite3.h"
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#include "SqliteSymbian.h"		//sqlite3SymbianLastOsError()
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////        Local const data   ///////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//4 collated comparisons + 1 folded comparison
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const TInt KCollationMethodCount = 4 + 1;
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//Names of the user defined collations (zero-terminated 16-bit strings)
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const TUint16* KCollationMethodName[KCollationMethodCount] = 
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	{
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	(const TUint16*)L"CompareC0", 
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	(const TUint16*)L"CompareC1", 
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	(const TUint16*)L"CompareC2", 
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	(const TUint16*)L"CompareC3", 
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	(const TUint16*)L"CompareF"
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	};
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////        Local functions      /////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//User-defined collation function prototype, accepted by SQLITE
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typedef TInt (*TCollationMethodPtr)(void* aUserDefinedData, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2);
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/**
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This function is used for collated/folded string comparisons,
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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aLevel - 0,1,2,3 - collation level; -1 - folded string comparison;
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt Compare(TInt aLevel, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	TPtrC16 ptr1(static_cast <const TUint16*> (aPtr1), (TUint)aByteSize1 /sizeof(TUint16));
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	TPtrC16 ptr2(static_cast <const TUint16*> (aPtr2), (TUint)aByteSize2 /sizeof(TUint16));
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	return aLevel >= 0 ? ptr1.CompareC(ptr2, aLevel, NULL) : ptr1.CompareF(ptr2);
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	}
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/**
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User defined function which will be used by SQLITE engine for collated string comparisons,
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collation level 0.
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt CompareC0(void*, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	return Compare(0, aByteSize1, aPtr1, aByteSize2, aPtr2);
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	}
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/**
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User defined function which will be used by SQLITE engine for collated string comparisons,
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collation level 1.
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt CompareC1(void*, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	return Compare(1, aByteSize1, aPtr1, aByteSize2, aPtr2);
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	}
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/**
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User defined function which will be used by SQLITE engine for collated string comparisons,
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collation level 2.
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt CompareC2(void*, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	return Compare(2, aByteSize1, aPtr1, aByteSize2, aPtr2);
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	}
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/**
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User defined function which will be used by SQLITE engine for collated string comparisons,
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collation level 3.
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt CompareC3(void*, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	return Compare(3, aByteSize1, aPtr1, aByteSize2, aPtr2);
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	}
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/**
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User defined function which will be used by SQLITE engine for folded string comparisons,
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{aByteSize1, aPtr1} - string 1, UTF16 encoded. aByteSize1 - length in bytes.
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{aByteSize2, aPtr2} - string 2, UTF16 encoded. aByteSize2 - length in bytes.
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The function returns negative, zero or positive if the first string is less than, equal to, or 
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greater than the second string.
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@internalComponent
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*/
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static TInt CompareF(void*, TInt aByteSize1, const void* aPtr1, TInt aByteSize2, const void* aPtr2)
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	{
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	return Compare(-1, aByteSize1, aPtr1, aByteSize2, aPtr2);
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	}
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//KCollationMethodPtr array contains function pointers to all user-defined collation functions
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const TCollationMethodPtr KCollationMethodPtr[KCollationMethodCount] = 
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	{
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	&CompareC0, &CompareC1, &CompareC2, &CompareC3, &CompareF
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	};
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////        TSqlCollationUtil class definition      //////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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Initializes TSqlCollationUtil data members.
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@panic SqlDb 4 In _DEBUG mode. aDbHandle is NULL.
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*/
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TSqlCollationUtil::TSqlCollationUtil(sqlite3* aDbHandle) :
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	iDbHandle(aDbHandle)
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	{
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	__SQLASSERT(iDbHandle != NULL, ESqlPanicBadArgument);
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	}
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/**
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Installs user defined collations.
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At the moment 5 user defined collations with the following names are installed:
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- CompareC0 - 16-bit strings collated comaprison at level 0;
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- CompareC1 - 16-bit strings collated comaprison at level 1;
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- CompareC2 - 16-bit strings collated comaprison at level 2;
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- CompareC3 - 16-bit strings collated comaprison at level 3;
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- CompareF  - 16-bit strings folded comaprison;
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These user defined collations can be used in the following cases:
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- as column constraint in "CREATE TABLE" SQL statements. For example:
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@code
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  CREATE TABLE A(Col1 TEXT COLLATE CompareC1)
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@endcode
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In this case every time when Col1 values have to be compared, the SQL server will use CompareC1 collation.
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- as column constraint in "CREATE INDEX" SQL statements. For example:
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@code
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  CREATE INDEX I ON A(Col1 COLLATE CompareC2)
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@endcode
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In this case SQL server will use CompareC2 collation to compare Col1 values when using the index.
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- In "ORDER BY" clause of "SELECT" SQL statements. For example:
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@code
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  SELECT * FROM A ORDER BY Col1 COLLATE CompareC3
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@endcode
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In this case SQL server will use CompareC3 collation to compare Col1 values when building the result set.
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@leave The function may leave with some database specific errors categorised as ESqlDbError.
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@panic SqlDb 2 In _DEBUG mode. iDbHandle is NULL.
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*/
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void TSqlCollationUtil::InstallCollationsL()
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	{
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	__SQLASSERT(iDbHandle != NULL, ESqlPanicInvalidObj);
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	(void)sqlite3SymbianLastOsError();//clear last OS error
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	//Register user defined collations
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	for(TInt i=0;i<KCollationMethodCount;++i)
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		{
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		TInt err = sqlite3_create_collation16(iDbHandle, reinterpret_cast <const char*> (KCollationMethodName[i]), 
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											  SQLITE_UTF16 | SQLITE_UTF16_ALIGNED, 0, KCollationMethodPtr[i]);
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		__SQLLEAVE_IF_ERROR(::Sql2OsErrCode(err, sqlite3SymbianLastOsError()));
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		}
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	}
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/**
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@return User-defined collation methods count.
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@see TSqlCollationUtil::CollationName() 
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*/
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TInt TSqlCollationUtil::CollationCount() const
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	{
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	return KCollationMethodCount;
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	}
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/**
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@return The name of the collation method, identified by aIndex.
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@panic SqlDb 4 In _DEBUG mode. aIndex >= CollationMethodCount().
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@see TSqlCollationUtil::CollationsCount() 
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*/
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TPtrC TSqlCollationUtil::CollationName(TInt aIndex) const
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	{
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	__SQLASSERT((TUint)aIndex < KCollationMethodCount, ESqlPanicBadArgument);
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	return TPtrC(KCollationMethodName[aIndex]);
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	}