System.Data.SQLite
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Overview
Comment:Also move the static SQLiteIndex marshalling methods into the SQLiteIndex class itself.
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SHA1: 82d24cdca30b6d936b31e17ce7ecab347acfa066
User & Date: mistachkin 2013-07-05 22:44:40
Context
2013-07-06
00:16
Enhance the comments for the SQLiteModuleNoop class. check-in: bf02fc9d80 user: mistachkin tags: trunk
2013-07-05
22:44
Also move the static SQLiteIndex marshalling methods into the SQLiteIndex class itself. check-in: 82d24cdca3 user: mistachkin tags: trunk
22:36
Move the static SQLiteValue marshalling method into the SQLiteValue class itself. check-in: bd1c5de6ec user: mistachkin tags: trunk
Changes
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Changes to System.Data.SQLite/SQLiteModule.cs.

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        {
            pValue = IntPtr.Zero;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Internal Methods
        /// <summary>
        /// Converts a logical array of native pointers to native sqlite3_value
        /// structures into a managed array of <see cref="SQLiteValue" />
        /// object instances.
        /// </summary>
        /// <param name="argc">
        /// The number of elements in the logical array of native sqlite3_value
................................................................................
            int nOrderBy
            )
        {
            inputs = new SQLiteIndexInputs(nConstraint, nOrderBy);
            outputs = new SQLiteIndexOutputs(nConstraint);
        }
        #endregion







































































































































































        ///////////////////////////////////////////////////////////////////////

        #region Public Properties
        private SQLiteIndexInputs inputs;
        /// <summary>
        /// The <see cref="SQLiteIndexInputs" /> object instance containing
................................................................................
#if !PLATFORM_COMPACTFRAMEWORK
            Marshal.WriteIntPtr(pointer, offset, value);
#else
            Marshal.WriteIntPtr(IntPtrForOffset(pointer, offset), value);
#endif
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region SQLiteIndex Helper Methods
        /// <summary>
        /// Converts a native pointer to a native sqlite3_index_info structure
        /// into a new <see cref="SQLiteIndex" /> object instance.
        /// </summary>
        /// <param name="pIndex">
        /// The native pointer to the native sqlite3_index_info structure to
        /// convert.
        /// </param>
        /// <param name="index">
        /// Upon success, this parameter will be modified to contain the newly
        /// created <see cref="SQLiteIndex" /> object instance.
        /// </param>
        public static void IndexFromIntPtr(
            IntPtr pIndex,
            ref SQLiteIndex index
            )
        {
            if (pIndex == IntPtr.Zero)
                return;

            int offset = 0;

            int nConstraint = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            IntPtr pConstraint = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            int nOrderBy = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            IntPtr pOrderBy = ReadIntPtr(pIndex, offset);

            index = new SQLiteIndex(nConstraint, nOrderBy);

            int sizeOfConstraintType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint constraint =
                    new UnsafeNativeMethods.sqlite3_index_constraint();

                Marshal.PtrToStructure(IntPtrForOffset(pConstraint,
                    iConstraint * sizeOfConstraintType), constraint);

                index.Inputs.Constraints[iConstraint] =
                    new SQLiteIndexConstraint(constraint);
            }

            int sizeOfOrderByType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_orderby));

            for (int iOrderBy = 0; iOrderBy < nOrderBy; iOrderBy++)
            {
                UnsafeNativeMethods.sqlite3_index_orderby orderBy =
                    new UnsafeNativeMethods.sqlite3_index_orderby();

                Marshal.PtrToStructure(IntPtrForOffset(pOrderBy,
                    iOrderBy * sizeOfOrderByType), orderBy);

                index.Inputs.OrderBys[iOrderBy] =
                    new SQLiteIndexOrderBy(orderBy);
            }
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Populates the outputs of a pre-allocated native sqlite3_index_info
        /// structure using an existing <see cref="SQLiteIndex" /> object
        /// instance.
        /// </summary>
        /// <param name="index">
        /// The existing <see cref="SQLiteIndex" /> object instance containing
        /// the output data to use.
        /// </param>
        /// <param name="pIndex">
        /// The native pointer to the pre-allocated native sqlite3_index_info
        /// structure.
        /// </param>
        public static void IndexToIntPtr(
            SQLiteIndex index,
            IntPtr pIndex
            )
        {
            if ((index == null) || (index.Inputs == null) ||
                (index.Inputs.Constraints == null) ||
                (index.Outputs == null) ||
                (index.Outputs.ConstraintUsages == null))
            {
                return;
            }

            if (pIndex == IntPtr.Zero)
                return;

            int offset = 0;

            int nConstraint = ReadInt32(pIndex, offset);

            if (nConstraint != index.Inputs.Constraints.Length)
                return;

            if (nConstraint != index.Outputs.ConstraintUsages.Length)
                return;

            offset += sizeof(int) + IntPtr.Size + sizeof(int) + IntPtr.Size;

            IntPtr pConstraintUsage = ReadIntPtr(pIndex, offset);

            int sizeOfConstraintUsageType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint_usage));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint_usage constraintUsage =
                    new UnsafeNativeMethods.sqlite3_index_constraint_usage(
                        index.Outputs.ConstraintUsages[iConstraint]);

                Marshal.StructureToPtr(
                    constraintUsage, IntPtrForOffset(pConstraintUsage,
                    iConstraint * sizeOfConstraintUsageType), false);

                index.Outputs.ConstraintUsages[iConstraint] =
                    new SQLiteIndexConstraintUsage(constraintUsage);
            }

            offset += IntPtr.Size;

            WriteInt32(pIndex, offset, index.Outputs.IndexNumber);

            offset += sizeof(int);

            WriteIntPtr(pIndex, offset, SQLiteString.Utf8IntPtrFromString(
                index.Outputs.IndexString));

            offset += IntPtr.Size;

            WriteInt32(pIndex, offset, 1); /* NOTE: We just allocated it. */

            offset += sizeof(int);

            WriteInt32(pIndex, offset, index.Outputs.OrderByConsumed);

            offset += sizeof(int);

            WriteDouble(pIndex, offset, index.Outputs.EstimatedCost);
        }
        #endregion
    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModule Base Class
    /// <summary>
................................................................................
            {
                SQLiteVirtualTable table = TableFromIntPtr(pVtab);

                if (table != null)
                {
                    SQLiteIndex index = null;

                    SQLiteMarshal.IndexFromIntPtr(pIndex, ref index);

                    if (BestIndex(table, index) == SQLiteErrorCode.Ok)
                    {
                        SQLiteMarshal.IndexToIntPtr(index, pIndex);
                        return SQLiteErrorCode.Ok;
                    }
                }
            }
            catch (Exception e) /* NOTE: Must catch ALL. */
            {
                SetTableError(pVtab, e.ToString());







|







 







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        {
            pValue = IntPtr.Zero;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Internal Marshal Helper Methods
        /// <summary>
        /// Converts a logical array of native pointers to native sqlite3_value
        /// structures into a managed array of <see cref="SQLiteValue" />
        /// object instances.
        /// </summary>
        /// <param name="argc">
        /// The number of elements in the logical array of native sqlite3_value
................................................................................
            int nOrderBy
            )
        {
            inputs = new SQLiteIndexInputs(nConstraint, nOrderBy);
            outputs = new SQLiteIndexOutputs(nConstraint);
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Internal Marshal Helper Methods
        /// <summary>
        /// Converts a native pointer to a native sqlite3_index_info structure
        /// into a new <see cref="SQLiteIndex" /> object instance.
        /// </summary>
        /// <param name="pIndex">
        /// The native pointer to the native sqlite3_index_info structure to
        /// convert.
        /// </param>
        /// <param name="index">
        /// Upon success, this parameter will be modified to contain the newly
        /// created <see cref="SQLiteIndex" /> object instance.
        /// </param>
        internal static void FromIntPtr(
            IntPtr pIndex,
            ref SQLiteIndex index
            )
        {
            if (pIndex == IntPtr.Zero)
                return;

            int offset = 0;

            int nConstraint = SQLiteMarshal.ReadInt32(pIndex, offset);

            offset += sizeof(int);

            IntPtr pConstraint = SQLiteMarshal.ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            int nOrderBy = SQLiteMarshal.ReadInt32(pIndex, offset);

            offset += sizeof(int);

            IntPtr pOrderBy = SQLiteMarshal.ReadIntPtr(pIndex, offset);

            index = new SQLiteIndex(nConstraint, nOrderBy);

            int sizeOfConstraintType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint constraint =
                    new UnsafeNativeMethods.sqlite3_index_constraint();

                Marshal.PtrToStructure(SQLiteMarshal.IntPtrForOffset(
                    pConstraint, iConstraint * sizeOfConstraintType),
                    constraint);

                index.Inputs.Constraints[iConstraint] =
                    new SQLiteIndexConstraint(constraint);
            }

            int sizeOfOrderByType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_orderby));

            for (int iOrderBy = 0; iOrderBy < nOrderBy; iOrderBy++)
            {
                UnsafeNativeMethods.sqlite3_index_orderby orderBy =
                    new UnsafeNativeMethods.sqlite3_index_orderby();

                Marshal.PtrToStructure(SQLiteMarshal.IntPtrForOffset(
                    pOrderBy, iOrderBy * sizeOfOrderByType), orderBy);

                index.Inputs.OrderBys[iOrderBy] =
                    new SQLiteIndexOrderBy(orderBy);
            }
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Populates the outputs of a pre-allocated native sqlite3_index_info
        /// structure using an existing <see cref="SQLiteIndex" /> object
        /// instance.
        /// </summary>
        /// <param name="index">
        /// The existing <see cref="SQLiteIndex" /> object instance containing
        /// the output data to use.
        /// </param>
        /// <param name="pIndex">
        /// The native pointer to the pre-allocated native sqlite3_index_info
        /// structure.
        /// </param>
        internal static void ToIntPtr(
            SQLiteIndex index,
            IntPtr pIndex
            )
        {
            if ((index == null) || (index.Inputs == null) ||
                (index.Inputs.Constraints == null) ||
                (index.Outputs == null) ||
                (index.Outputs.ConstraintUsages == null))
            {
                return;
            }

            if (pIndex == IntPtr.Zero)
                return;

            int offset = 0;

            int nConstraint = SQLiteMarshal.ReadInt32(pIndex, offset);

            if (nConstraint != index.Inputs.Constraints.Length)
                return;

            if (nConstraint != index.Outputs.ConstraintUsages.Length)
                return;

            offset += sizeof(int) + IntPtr.Size + sizeof(int) + IntPtr.Size;

            IntPtr pConstraintUsage = SQLiteMarshal.ReadIntPtr(pIndex, offset);

            int sizeOfConstraintUsageType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint_usage));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint_usage constraintUsage =
                    new UnsafeNativeMethods.sqlite3_index_constraint_usage(
                        index.Outputs.ConstraintUsages[iConstraint]);

                Marshal.StructureToPtr(
                    constraintUsage, SQLiteMarshal.IntPtrForOffset(
                    pConstraintUsage, iConstraint * sizeOfConstraintUsageType),
                    false);

                index.Outputs.ConstraintUsages[iConstraint] =
                    new SQLiteIndexConstraintUsage(constraintUsage);
            }

            offset += IntPtr.Size;

            SQLiteMarshal.WriteInt32(pIndex, offset,
                index.Outputs.IndexNumber);

            offset += sizeof(int);

            SQLiteMarshal.WriteIntPtr(pIndex, offset,
                SQLiteString.Utf8IntPtrFromString(index.Outputs.IndexString));

            offset += IntPtr.Size;

            //
            // NOTE: We just allocated the IndexString field; therefore, we
            //       need to set the NeedToFreeIndexString field to non-zero.
            //
            SQLiteMarshal.WriteInt32(pIndex, offset, 1);

            offset += sizeof(int);

            SQLiteMarshal.WriteInt32(pIndex, offset,
                index.Outputs.OrderByConsumed);

            offset += sizeof(int);

            SQLiteMarshal.WriteDouble(pIndex, offset,
                index.Outputs.EstimatedCost);
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Properties
        private SQLiteIndexInputs inputs;
        /// <summary>
        /// The <see cref="SQLiteIndexInputs" /> object instance containing
................................................................................
#if !PLATFORM_COMPACTFRAMEWORK
            Marshal.WriteIntPtr(pointer, offset, value);
#else
            Marshal.WriteIntPtr(IntPtrForOffset(pointer, offset), value);
#endif
        }
        #endregion





























































































































































    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModule Base Class
    /// <summary>
................................................................................
            {
                SQLiteVirtualTable table = TableFromIntPtr(pVtab);

                if (table != null)
                {
                    SQLiteIndex index = null;

                    SQLiteIndex.FromIntPtr(pIndex, ref index);

                    if (BestIndex(table, index) == SQLiteErrorCode.Ok)
                    {
                        SQLiteIndex.ToIntPtr(index, pIndex);
                        return SQLiteErrorCode.Ok;
                    }
                }
            }
            catch (Exception e) /* NOTE: Must catch ALL. */
            {
                SetTableError(pVtab, e.ToString());