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os/persistentdata/persistentstorage/sql/SRC/Common/SqlBufIterator.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     1 // Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <e32math.h>		//Math class

    17 #include <s32mem.h>			//TMemBuf

    18 #include "SqlBufIterator.h"

    19 

    20 ///////////////////////////////////////////////////////////////////////////////////////////////////////////

    21 ////////////////////////          TSqlBufIterator class               /////////////////////////////////////

    22 ///////////////////////////////////////////////////////////////////////////////////////////////////////////

    23 

    24 /**

    25 @return Represents the content of the current flat buffer field as integer value.

    26 */

    27 inline TInt TSqlBufRIterator::AsInt() const

    28 	{

    29 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

    30 	return *reinterpret_cast <const TInt32*> (reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos);

    31 	}

    32 

    33 /**

    34 @return Represents the content of the current flat buffer field as 64 bit integer value.

    35 */

    36 inline TInt64 TSqlBufRIterator::AsInt64() const

    37 	{

    38 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

    39 	return *reinterpret_cast <const TInt64*> (reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos);

    40 	}

    41 

    42 /**

    43 @return Represents the content of the current flat buffer field as real value.

    44 */

    45 inline TReal TSqlBufRIterator::AsReal() const

    46 	{

    47 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

    48 	return *reinterpret_cast <const TReal*> (reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos);

    49 	}

    50 

    51 /**

    52 @return Represents the content of the current flat buffer field as integer value.

    53 		If the current flat buffer field type does not refer to an integer, then 

    54 		the function will do a data conversion as described in the table which can be found

    55 		in SqlBufIterator.h file.

    56 */

    57 TInt TSqlBufRIterator::Int() const

    58 	{

    59 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

    60 	switch(Type())

    61 		{

    62 		case ESqlInt64:

    63 			{

    64 			TInt64 val = AsInt64();

    65 			return val == (TInt)val ? (TInt)val : (val < KMinTInt ? KMinTInt : KMaxTInt);

    66 			}

    67 		case ESqlReal:

    68 			{

    69 			TReal roundVal;

    70 			TInt err = Math::Round(roundVal, AsReal(), 0);

    71 			if(err != KErrNone)

    72 				{

    73 				return KMinTInt;

    74 				}

    75 			TRealX val(roundVal);

    76 			return static_cast <TInt> (val);

    77 			}

    78 		case ESqlNull:

    79 		case ESqlText:

    80 		case ESqlBinary:

    81 			return 0;

    82 		case ESqlZeroBlob:

    83 			return AsInt();

    84 		default:

    85 			return AsInt();

    86 		}

    87 	}

    88 

    89 /**

    90 @return Represents the content of the current flat buffer field as 64 bit integer value.

    91 		If the current flat buffer field type does not refer to a 64 bit integer, then 

    92 		the function will do a data conversion as described in the table which can be found

    93 		in SqlBufIterator.h file.

    94 */

    95 TInt64 TSqlBufRIterator::Int64() const

    96 	{

    97 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

    98 	switch(Type())

    99 		{

   100 		case ESqlInt:

   101 		case ESqlZeroBlob:

   102 			return AsInt();

   103 		case ESqlReal:

   104 			{

   105 			TReal roundVal;

   106 			TInt err = Math::Round(roundVal, AsReal(), 0);

   107 			if(err != KErrNone)

   108 				{

   109 				return KMinTInt64;

   110 				}

   111 			TRealX val(roundVal);

   112 			return static_cast <TInt64> (val);

   113 			}

   114 		case ESqlNull:

   115 		case ESqlText:

   116 		case ESqlBinary:

   117 			return 0;

   118 		default:

   119 			return AsInt64();

   120 		}

   121 	}

   122 

   123 /**

   124 @return Represents the content of the current flat buffer field as real value.

   125 		If the current flat buffer field type does not refer to a real, then 

   126 		the function will do a data conversion as described in the table which can be found

   127 		in SqlBufIterator.h file.

   128 */

   129 TReal TSqlBufRIterator::Real() const

   130 	{

   131 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

   132 	switch(Type())

   133 		{

   134 		case ESqlInt:

   135 		case ESqlZeroBlob:

   136 			{

   137 			TRealX val(AsInt());	

   138 			return static_cast <TReal> (val);

   139 			}

   140 		case ESqlInt64:

   141 			{

   142 			TRealX val(AsInt64());	

   143 			return static_cast <TReal> (val);

   144 			}

   145 		case ESqlNull:

   146 		case ESqlText:

   147 		case ESqlBinary:

   148 			return 0.0;

   149 		default:

   150 			return AsReal();

   151 		}

   152 	}

   153 

   154 /**

   155 @return Represents the content of the current flat buffer field as binary (8 bit) descriptor.

   156 		If the current flat buffer field type does not refer to a binary block of data, then 

   157 		the function will do a data conversion as described in the table which can be found

   158 		in SqlBufIterator.h file.

   159 */

   160 TPtrC8 TSqlBufRIterator::Binary() const

   161 	{

   162 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

   163 	TInt size = Size();

   164 	if(Type() != ESqlBinary || size == 0)

   165 		{

   166 		return 	TPtrC8();

   167 		}

   168 	return TPtrC8(reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos, size);

   169 	}

   170 

   171 /**

   172 @return Represents the content of the current flat buffer field as text (16 bit) descriptor.

   173 		If the current flat buffer field type does not refer to a text block of data, then 

   174 		the function will do a data conversion as described in the table which can be found

   175 		in SqlBufIterator.h file.

   176 */

   177 TPtrC16 TSqlBufRIterator::Text() const

   178 	{

   179 	__ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

   180 	TInt size = Size();

   181 	if(Type() != ESqlText || size == 0)

   182 		{

   183 		return 	TPtrC16();

   184 		}

   185 	return TPtrC16(reinterpret_cast <const TUint16*> (reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos), size);

   186 	}

   187 

   188 /**

   189 An instance of the class is used to get a read-only access to the content of a text or binary column

   190 via a stream object.

   191 

   192 @internalComponent

   193 */

   194 class HReadOnlyBuf : public TMemBuf

   195 	{

   196 public:

   197 	static HReadOnlyBuf* NewL(const TUint8* aFrom, TInt aLen)

   198 		{

   199 		__ASSERT_DEBUG(aLen >= 0, __SQLPANIC2(ESqlPanicBadArgument));

   200    		HReadOnlyBuf* self = new (ELeave) HReadOnlyBuf;

   201 		TUint8* p = const_cast <TUint8*> (aFrom);

   202 		self->Set(p, p + aLen, MStreamBuf::ERead);

   203 		return self;

   204 		}

   205 		

   206 private:

   207 	virtual void DoRelease()

   208 		{

   209 		delete this;	

   210 		}

   211 	

   212 };

   213 

   214 /**

   215 @return Represents the content of a text or a binary field as a stream of bytes.

   216 

   217 @leave KErrNoMemory, out of memory condition has occured,

   218 	   KErrArgument, the column type is not text, blob or null;

   219 */	

   220 MStreamBuf* TSqlBufRIterator::StreamL() const

   221 	{

   222     __ASSERT_DEBUG(iCurrent >= iBegin && iCurrent < iEnd, __SQLPANIC(ESqlPanicInternalError));

   223 	if(!::IsSequenceSqlType(Type()))

   224 		{

   225 		__SQLLEAVE(KErrArgument);

   226 		}

   227 	return HReadOnlyBuf::NewL(reinterpret_cast <const TUint8*> (iBegin) + iCurrent->iPos, iCurrent->Size());

   228 	}
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