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112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/******************************************************************************
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* $Id: we_colbufsec.h 4450 2013-01-21 14:13:24Z rdempsey $
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*
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*****************************************************************************/
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/** @file
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* class ColumnBufferSection
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*/
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#pragma once
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#include "we_type.h"
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#include "we_colbuf.h"
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namespace WriteEngine
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{
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/* @brief Status codes for the ColumnBufferSection
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*/
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enum
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{
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INIT_COMPLETE,
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WRITE_COMPLETE,
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};
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/**
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* @brief ColumnBufferSection class represent a section of the ColumnBuffer and
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* provides functionality for writing to the ColumnBuffer.
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*/
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class ColumnBufferSection
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{
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public:
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/* @brief Constructor
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*
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* @param cb Ptr to this section's corresponding CoulmnBuffer
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* @param startRowId Starting row-id of the column
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* @param endRowId Ending row-id of the column
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* @param Width Width of the underlying column
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* @param startOffset
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*/
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ColumnBufferSection(ColumnBuffer* const cb, RID startRowId, RID endRowId, int colWidth, int startOffset);
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/* @brief Default destructor
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*/
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~ColumnBufferSection();
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/* @brief Updates the status of the section
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*
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* @param Status value
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*/
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void setStatus(int status);
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/* @brief Write data into the column buffer section
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*
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* @param data pointer to the data
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* @param nRows Number of rows to be written, starting from data pointer
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*/
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void write(const void* const data, int nRows);
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/* @brief Returns the current status of the section
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*/
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int getStatus() const;
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/* @brief Returns the start offset of this section
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*/
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int getStartOffset() const;
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/* @brief Returns the size of this section
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*/
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int getSectionSize() const;
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/* @brief Returns the ending row-id of this section
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*/
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RID endRowId() const
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{
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return fEndRowId;
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}
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/* @brief Returns the starting row-id of this section
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*/
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RID startRowId() const
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{
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return fStartRowId;
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}
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private:
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const ColumnBuffer* const fCBuf; // ColumnBuffer associated with this section
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RID fStartRowId; // Starting row-id for this section
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RID fEndRowId; // Ending row-id for this section
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int fColWidth; // Width of column (in bytes)
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int fBufStartOffset; // Starting offset of this section in ColumnBuffer
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RID fCurrRowId; // row-id which will be written next
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int fStatus; // Status of this section
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};
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} // namespace WriteEngine
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