142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
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/*
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\newpage
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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 SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//[_] [\_]
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//characters [1] verbatim: [$] [$]
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//characters [2] formula: [$] [$]
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//characters [3] capital: [\textsc{] [}]
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//characters [4] teletype: [\texttt{] [}]
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1.1 Headerfile "GTree[_]InternalEntry.h"[4]
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January-May 2008, Mirko Dibbert
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*/
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#ifndef __GTREE_INTERNAL_ENTRY_H__
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#define __GTREE_INTERNAL_ENTRY_H__
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#include "GTree_EntryBase.h"
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#include "GTree_FileNode.h"
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namespace gtree
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{
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/********************************************************************
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Class ~InternalEntry~
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This class should be used as base class for all internal entries. The derived classes must overwrite the "read"[4], "write"[4] and "size"[4] method and call the resp. methods of the base class.
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********************************************************************/
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class InternalEntry
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: public EntryBase
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{
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public:
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/*
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Default constructor.
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*/
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inline InternalEntry(SmiRecordId chield = 0)
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: m_chield(chield)
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{}
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/*
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Constructor (sets chield-id to the record-id of "node"[4]).
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*/
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inline InternalEntry(NodePtr node)
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: m_chield(node->getNodeId())
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{}
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/*
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Default copy constructor.
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*/
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inline InternalEntry(const InternalEntry &e)
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: m_chield(e.m_chield)
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{}
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/*
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Destructor.
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*/
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inline ~InternalEntry()
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{}
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/*
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Writes the entry object to buffer and increses offset.
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*/
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inline void write(char *const buffer, int &offset) const
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{
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memcpy(buffer+offset, &m_chield, sizeof(SmiRecordId));
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offset += sizeof(SmiRecordId);
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}
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/*
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Reads the entry object from buffer and increses offset.
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*/
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inline void read(const char *const buffer, int &offset)
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{
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memcpy(&m_chield, buffer+offset, sizeof(SmiRecordId));
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offset += sizeof(SmiRecordId);
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}
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/*
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Returns the size of the entry on disc.
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*/
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inline size_t size()
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{ return sizeof(SmiRecordId); }
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/*
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Returns the record-id of the chield node.
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*/
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SmiRecordId chield() const
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{ return m_chield; }
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/*
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Sets the chield record-id to "nodeId"[4].
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*/
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inline void setChield(SmiRecordId nodeId)
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{ m_chield = nodeId; }
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/*
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Sets the chield record-id to the record-id of "node"[4].
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*/
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inline void setChield(NodePtr node)
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{ m_chield = node->getNodeId(); }
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private:
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SmiRecordId m_chield; // pointer to chield node
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}; // class InternalEntry
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} // namespace gtree
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#endif // #define __GTREE_INTERNAL_ENTRY_H__
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