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# ogr_attrind.h

    00001 /******************************************************************************
    00002  * $Id: ogr_attrind.h 10645 2007-01-18 02:22:39Z warmerdam $
    00003  *
    00004  * Project:  OpenGIS Simple Features Reference Implementation
    00005  * Purpose:  Classes related to generic implementation of attribute indexing.
    00006  * Author:   Frank Warmerdam, warmerdam@pobox.com
    00007  *
    00008  ******************************************************************************
    00009  * Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com>
    00010  *
    00011  * Permission is hereby granted, free of charge, to any person obtaining a
    00012  * copy of this software and associated documentation files (the "Software"),
    00013  * to deal in the Software without restriction, including without limitation
    00014  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00015  * and/or sell copies of the Software, and to permit persons to whom the
    00016  * Software is furnished to do so, subject to the following conditions:
    00017  *
    00018  * The above copyright notice and this permission notice shall be included
    00019  * in all copies or substantial portions of the Software.
    00020  *
    00021  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00022  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00023  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00024  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00025  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00026  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00027  * DEALINGS IN THE SOFTWARE.
    00028  ****************************************************************************/
    00029
    00030 #ifndef _OGR_ATTRIND_H_INCLUDED
    00031 #define _OGR_ATTRIND_H_INCLUDED
    00032
    00033 #include "ogrsf_frmts.h"
    00034
    00035 /************************************************************************/
    00036 /*                             OGRAttrIndex                             */
    00037 /*                                                                      */
    00038 /*      Base class for accessing the indexing info about one field.     */
    00039 /************************************************************************/
    00040
    00041 class CPL_DLL OGRAttrIndex
    00042 {
    00043 protected:
    00044                 OGRAttrIndex();
    00045
    00046 public:
    00047     virtual     ~OGRAttrIndex();
    00048
    00049     virtual long   GetFirstMatch( OGRField *psKey ) = 0;
    00050     virtual long  *GetAllMatches( OGRField *psKey ) = 0;
    00051
    00052     virtual OGRErr AddEntry( OGRField *psKey, long nFID ) = 0;
    00053     virtual OGRErr RemoveEntry( OGRField *psKey, long nFID ) = 0;
    00054
    00055     virtual OGRErr Clear() = 0;
    00056 };
    00057
    00058 /************************************************************************/
    00059 /*                          OGRLayerAttrIndex                           */
    00060 /*                                                                      */
    00061 /*      Base class representing attribute indexes for all indexed       */
    00062 /*      fields in a layer.                                              */
    00063 /************************************************************************/
    00064
    00065 class CPL_DLL OGRLayerAttrIndex
    00066 {
    00067 protected:
    00068     OGRLayer    *poLayer;
    00069     char        *pszIndexPath;
    00070
    00071                 OGRLayerAttrIndex();
    00072
    00073 public:
    00074     virtual     ~OGRLayerAttrIndex();
    00075
    00076     virtual OGRErr Initialize( const char *pszIndexPath, OGRLayer * ) = 0;
    00077
    00078     virtual OGRErr CreateIndex( int iField ) = 0;
    00079     virtual OGRErr DropIndex( int iField ) = 0;
    00080     virtual OGRErr IndexAllFeatures( int iField = -1 ) = 0;
    00081
    00082     virtual OGRErr AddToIndex( OGRFeature *poFeature, int iField = -1 ) = 0;
    00083     virtual OGRErr RemoveFromIndex( OGRFeature *poFeature ) = 0;
    00084
    00085     virtual OGRAttrIndex *GetFieldIndex( int iField ) = 0;
    00086 };
    00087
    00088 OGRLayerAttrIndex CPL_DLL *OGRCreateDefaultLayerIndex();
    00089
    00090
    00091 #endif /* ndef _OGR_ATTRIND_H_INCLUDED */
    00092

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