EVOLUTION-MANAGER

Edit File: ogravcbinlayer.cpp

/******************************************************************************
 * $Id: ogravcbinlayer.cpp 10645 2007-01-18 02:22:39Z warmerdam $
 *
 * Project:  OGR
 * Purpose:  Implements OGRAVCBinLayer class.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam <warmerdam@pobox.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ogr_avc.h"
#include "ogr_api.h"
#include "cpl_conv.h"
#include "cpl_string.h"

CPL_CVSID("$Id: ogravcbinlayer.cpp 10645 2007-01-18 02:22:39Z warmerdam $");

/************************************************************************/
/*                           OGRAVCBinLayer()                           */
/************************************************************************/

OGRAVCBinLayer::OGRAVCBinLayer( OGRAVCBinDataSource *poDSIn,
                                AVCE00Section *psSectionIn )
        : OGRAVCLayer( psSectionIn->eType, poDSIn )

{
    psSection = psSectionIn;
    hFile = NULL;
    poArcLayer = NULL;
    bNeedReset = FALSE;
    nNextFID = 1;

hTable = NULL;
    nTableBaseField = -1;
    nTableAttrIndex = -1;

SetupFeatureDefinition( psSection->pszName );
    
    szTableName[0] = '\0';
    if( psSection->eType == AVCFilePAL )
        sprintf( szTableName, "%s.PAT", poDS->GetCoverageName() );
    else if( psSection->eType == AVCFileRPL )
        sprintf( szTableName, "%s.PAT%s", poDS->GetCoverageName(),
                 psSectionIn->pszName );
    else if( psSection->eType == AVCFileARC )
        sprintf( szTableName, "%s.AAT", poDS->GetCoverageName() );
    else if( psSection->eType == AVCFileLAB )
    {
        AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();

sprintf( szTableName, "%s.PAT", poDS->GetCoverageName() );

for( int iSection = 0; iSection < psInfo->numSections; iSection++ )
        {
            if( psInfo->pasSections[iSection].eType == AVCFilePAL )
                nTableAttrIndex = poFeatureDefn->GetFieldIndex( "PolyId" );
        }
    }

CheckSetupTable();
}

/************************************************************************/
/*                          ~OGRAVCBinLayer()                           */
/************************************************************************/

OGRAVCBinLayer::~OGRAVCBinLayer()

{
    ResetReading();
}

/************************************************************************/
/*                            ResetReading()                            */
/************************************************************************/

void OGRAVCBinLayer::ResetReading()

{
    if( hFile != NULL )
    {
        AVCBinReadClose( hFile );
        hFile = NULL;
    }

bNeedReset = FALSE;
    nNextFID = 1;

if( hTable != NULL )
    {
        AVCBinReadClose( hTable );
        hTable = NULL;
    }
}

/************************************************************************/
/*                             GetFeature()                             */
/************************************************************************/

OGRFeature *OGRAVCBinLayer::GetFeature( long nFID )

{
/* -------------------------------------------------------------------- */
/*      If we haven't started yet, open the file now.                   */
/* -------------------------------------------------------------------- */
    if( hFile == NULL )
    {
        AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();

hFile = AVCBinReadOpen(psInfo->pszCoverPath, 
                               psSection->pszFilename, 
                               psInfo->eCoverType, 
                               psSection->eType,
                               psInfo->psDBCSInfo);
    }

/* -------------------------------------------------------------------- */
/*      Read the raw feature - the -3 fid is a special flag             */
/*      indicating serial access.                                       */
/* -------------------------------------------------------------------- */
    void *pFeature;

if( nFID == -3 )
    {
        while( (pFeature = AVCBinReadNextObject( hFile )) != NULL
               && !MatchesSpatialFilter( pFeature ) )
        {
            nNextFID++;
        }
    }
    else
    {
        bNeedReset = TRUE;
        pFeature = AVCBinReadObject( hFile, nFID );
    }
        
    if( pFeature == NULL )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Translate the feature.                                          */
/* -------------------------------------------------------------------- */
    OGRFeature *poFeature;

poFeature = TranslateFeature( pFeature );
    if( poFeature == NULL )
        return NULL;

/* -------------------------------------------------------------------- */
/*      LAB's we have to assign the FID to directly, since it           */
/*      doesn't seem to be stored in the file structure.                */
/* -------------------------------------------------------------------- */
    if( psSection->eType == AVCFileLAB )
    {
        if( nFID == -3 )
            poFeature->SetFID( nNextFID++ );
        else
            poFeature->SetFID( nFID );
    }

/* -------------------------------------------------------------------- */
/*      If this is a polygon layer, try to assemble the arcs to form    */
/*      the whole polygon geometry.                                     */
/* -------------------------------------------------------------------- */
    if( psSection->eType == AVCFilePAL 
        || psSection->eType == AVCFileRPL )
        FormPolygonGeometry( poFeature, (AVCPal *) pFeature );

/* -------------------------------------------------------------------- */
/*      If we have an attribute table, append the attributes now.       */
/* -------------------------------------------------------------------- */
    AppendTableFields( poFeature );

return poFeature;
}

/************************************************************************/
/*                           GetNextFeature()                           */
/************************************************************************/

OGRFeature *OGRAVCBinLayer::GetNextFeature()

{
    if( bNeedReset )
        ResetReading();

OGRFeature *poFeature = GetFeature( -3 );

// Skip universe polygon.
    if( poFeature != NULL && poFeature->GetFID() == 1 
        && psSection->eType == AVCFilePAL )
    {
        OGRFeature::DestroyFeature( poFeature );
        poFeature = GetFeature( -3 );
    }

while( poFeature != NULL 
           && ((m_poAttrQuery != NULL
                && !m_poAttrQuery->Evaluate( poFeature ) )
               || !FilterGeometry( poFeature->GetGeometryRef() ) ) )
    {
        OGRFeature::DestroyFeature( poFeature );
        poFeature = GetFeature( -3 );
    }

if( poFeature == NULL )
        ResetReading();

return poFeature;
}

/************************************************************************/
/*                           TestCapability()                           */
/************************************************************************/

int OGRAVCBinLayer::TestCapability( const char * pszCap )

{
    if( eSectionType == AVCFileARC && EQUAL(pszCap,OLCRandomRead) )
        return TRUE;
    else 
        return OGRAVCLayer::TestCapability( pszCap );
}

/************************************************************************/
/*                        FormPolygonGeometry()                         */
/*                                                                      */
/*      Collect all the arcs forming edges to this polygon and form     */
/*      them into the appropriate OGR geometry on the target feature.   */
/************************************************************************/

int OGRAVCBinLayer::FormPolygonGeometry( OGRFeature *poFeature, 
                                         AVCPal *psPAL )

{
/* -------------------------------------------------------------------- */
/*      Try to find the corresponding ARC layer if not already          */
/*      recorded.                                                       */
/* -------------------------------------------------------------------- */
    if( poArcLayer == NULL )
    {
        int	i;

for( i = 0; i < poDS->GetLayerCount(); i++ )
        {
            OGRAVCBinLayer *poLayer = (OGRAVCBinLayer *) poDS->GetLayer(i);

if( poLayer->eSectionType == AVCFileARC )
                poArcLayer = poLayer;
        }

if( poArcLayer == NULL )
            return FALSE;
    }

/* -------------------------------------------------------------------- */
/*	Read all the arcs related to this polygon, making a working	*/
/*	copy of them since the one returned by AVC is temporary.	*/
/* -------------------------------------------------------------------- */
    OGRGeometryCollection oArcs;
    int		iArc;

for( iArc = 0; iArc < psPAL->numArcs; iArc++ )
    {
        OGRFeature *poArc;

if( psPAL->pasArcs[iArc].nArcId == 0 )
            continue;

// If the other side of the line is the same polygon then this
        // arc is a "bridge" arc and can be discarded.  If we don't discard
        // it, then we should double it as bridge arcs seem to only appear
        // once.  But by discarding it we ensure a multi-ring polygon will be
        // properly formed. 
        if( psPAL->pasArcs[iArc].nAdjPoly == psPAL->nPolyId )
            continue;

poArc = poArcLayer->GetFeature( ABS(psPAL->pasArcs[iArc].nArcId) );

if( poArc == NULL )
            return FALSE;

if( poArc->GetGeometryRef() == NULL )
            return FALSE;

oArcs.addGeometry( poArc->GetGeometryRef() );
        OGRFeature::DestroyFeature( poArc );
    }

OGRErr  eErr;
    OGRPolygon *poPolygon;

poPolygon = (OGRPolygon *) 
        OGRBuildPolygonFromEdges( (OGRGeometryH) &oArcs, TRUE, FALSE,  
                                  0.0, &eErr );
    if( poPolygon != NULL )
        poFeature->SetGeometryDirectly( poPolygon );

return eErr == OGRERR_NONE;
}

/************************************************************************/
/*                          CheckSetupTable()                           */
/*                                                                      */
/*      Check if the named table exists, and if so, setup access to     */
/*      it (open it), and add it's fields to the feature class          */
/*      definition.                                                     */
/************************************************************************/

int OGRAVCBinLayer::CheckSetupTable()

{
    if( szTableName[0] == '\0' )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Scan for the indicated section.                                 */
/* -------------------------------------------------------------------- */
    AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();
    int           iSection;
    AVCE00Section *psSection = NULL;
    char	  szPaddedName[65];
    
    sprintf( szPaddedName, "%s%32s", szTableName, " " );
    szPaddedName[32] = '\0';

for( iSection = 0; iSection < psInfo->numSections; iSection++ )
    {
        if( EQUAL(szPaddedName,psInfo->pasSections[iSection].pszName) 
            && psInfo->pasSections[iSection].eType == AVCFileTABLE )
            psSection = psInfo->pasSections + iSection;
    }

if( psSection == NULL )
    {
        szTableName[0] = '\0';
        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Try opening the table.                                          */
/* -------------------------------------------------------------------- */
    hTable = AVCBinReadOpen( psInfo->pszInfoPath,  szTableName,
                             psInfo->eCoverType, AVCFileTABLE,
                             psInfo->psDBCSInfo);
    
    if( hTable == NULL )
    {
        szTableName[0] = '\0';
        return FALSE;
    }
    
/* -------------------------------------------------------------------- */
/*      Setup attributes.                                               */
/* -------------------------------------------------------------------- */
    nTableBaseField = poFeatureDefn->GetFieldCount();
    
    AppendTableDefinition( hTable->hdr.psTableDef );

/* -------------------------------------------------------------------- */
/*      Close table so we don't have to many files open at once.        */
/* -------------------------------------------------------------------- */
    AVCBinReadClose( hTable );

hTable = NULL;

return TRUE;
}

/************************************************************************/
/*                         AppendTableFields()                          */
/************************************************************************/

int OGRAVCBinLayer::AppendTableFields( OGRFeature *poFeature )

{
    AVCE00ReadPtr psInfo = ((OGRAVCBinDataSource *) poDS)->GetInfo();

if( szTableName[0] == '\0' )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Open the table if it is currently closed.                       */
/* -------------------------------------------------------------------- */
    if( hTable == NULL )
    {
        hTable = AVCBinReadOpen( psInfo->pszInfoPath,  szTableName,
                                 psInfo->eCoverType, AVCFileTABLE,
                                 psInfo->psDBCSInfo);
    }

if( hTable == NULL )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Read the info record.                                           */
/*                                                                      */
/*      We usually assume the FID of the feature is the key but in a    */
/*      polygon coverage we need to use the PolyId attribute of LAB     */
/*      features to lookup the related attributes.  In this case        */
/*      nTableAttrIndex will already be setup to refer to the           */
/*      PolyId field.                                                   */
/* -------------------------------------------------------------------- */
    int	nRecordId;
    void *hRecord;

if( nTableAttrIndex == -1 )
        nRecordId = poFeature->GetFID();
    else
        nRecordId = poFeature->GetFieldAsInteger( nTableAttrIndex );

hRecord = AVCBinReadObject( hTable, nRecordId );
    if( hRecord == NULL )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Translate it.                                                   */
/* -------------------------------------------------------------------- */
    return TranslateTableFields( poFeature, nTableBaseField, 
                                 hTable->hdr.psTableDef, 
                                 (AVCField *) hRecord );
}