/****************************************************************************** * $Id: ogrntflayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $ * * Project:  UK NTF Reader * Purpose:  Implements OGRNTFLayer class. * Author:   Frank Warmerdam, warmerdam@pobox.com * ****************************************************************************** * Copyright (c) 1999, Frank Warmerdam * * 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 "ntf.h"#include "cpl_conv.h"CPL_CVSID("$Id: ogrntflayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $");/************************************************************************//*                            OGRNTFLayer()                             *//*                                                                      *//*      Note that the OGRNTFLayer assumes ownership of the passed       *//*      OGRFeatureDefn object.                                          *//************************************************************************/OGRNTFLayer::OGRNTFLayer( OGRNTFDataSource *poDSIn,                          OGRFeatureDefn * poFeatureDefine,                          NTFFeatureTranslator pfnTranslatorIn ){    poDS = poDSIn;    poFeatureDefn = poFeatureDefine;    pfnTranslator = pfnTranslatorIn;    iCurrentReader = -1;    nCurrentPos = -1;    nCurrentFID = 1;}/************************************************************************//*                           ~OGRNTFLayer()                           *//************************************************************************/OGRNTFLayer::~OGRNTFLayer(){    if( m_nFeaturesRead > 0 && poFeatureDefn != NULL )    {        CPLDebug( "Mem", "%d features read on layer '%s'.",                  (int) m_nFeaturesRead,                   poFeatureDefn->GetName() );    }    if( poFeatureDefn )        poFeatureDefn->Release();}/************************************************************************//*                            ResetReading()                            *//************************************************************************/void OGRNTFLayer::ResetReading(){    iCurrentReader = -1;    nCurrentPos = -1;    nCurrentFID = 1;}/************************************************************************//*                           GetNextFeature()                           *//************************************************************************/OGRFeature *OGRNTFLayer::GetNextFeature(){    OGRFeature  *poFeature = NULL;/* -------------------------------------------------------------------- *//*      Have we processed all features already?                         *//* -------------------------------------------------------------------- */    if( iCurrentReader == poDS->GetFileCount() )        return NULL;/* -------------------------------------------------------------------- *//*      Do we need to open a file?                                      *//* -------------------------------------------------------------------- */    if( iCurrentReader == -1 )    {        iCurrentReader++;        nCurrentPos = -1;    }    NTFFileReader       *poCurrentReader = poDS->GetFileReader(iCurrentReader);    if( poCurrentReader->GetFP() == NULL )    {        poCurrentReader->Open();    }/* -------------------------------------------------------------------- *//*      Ensure we are reading on from the same point we were reading    *//*      from for the last feature, even if some other access            *//*      mechanism has moved the file pointer.                           *//* -------------------------------------------------------------------- */    if( nCurrentPos != -1 )        poCurrentReader->SetFPPos( nCurrentPos, nCurrentFID );    else        poCurrentReader->Reset();        /* -------------------------------------------------------------------- *//*      Read features till we find one that satisfies our current       *//*      spatial criteria.                                               *//* -------------------------------------------------------------------- */    while( TRUE )    {        poFeature = poCurrentReader->ReadOGRFeature( this );        if( poFeature == NULL )            break;        m_nFeaturesRead++;        if( (m_poFilterGeom == NULL             || poFeature->GetGeometryRef() == NULL              || FilterGeometry( poFeature->GetGeometryRef() ) )            && (m_poAttrQuery == NULL                || m_poAttrQuery->Evaluate( poFeature )) )            break;        delete poFeature;    }/* -------------------------------------------------------------------- *//*      If we get NULL the file must be all consumed, advance to the    *//*      next file that contains features for this layer.                *//* -------------------------------------------------------------------- */    if( poFeature == NULL )    {        poCurrentReader->Close();        if( poDS->GetOption("CACHING") != NULL            && EQUAL(poDS->GetOption("CACHING"),"OFF") )        {            poCurrentReader->DestroyIndex();        }        do {             iCurrentReader++;        } while( iCurrentReader < poDS->GetFileCount()                 && !poDS->GetFileReader(iCurrentReader)->TestForLayer(this) );        nCurrentPos = -1;        nCurrentFID = 1;        poFeature = GetNextFeature();    }    else    {        poCurrentReader->GetFPPos(&nCurrentPos, &nCurrentFID);    }    return poFeature;}/************************************************************************//*                           TestCapability()                           *//************************************************************************/int OGRNTFLayer::TestCapability( const char * pszCap ){    if( EQUAL(pszCap,OLCRandomRead) )        return FALSE;    else if( EQUAL(pszCap,OLCSequentialWrite)              || EQUAL(pszCap,OLCRandomWrite) )        return FALSE;    else if( EQUAL(pszCap,OLCFastFeatureCount) )        return FALSE;    else if( EQUAL(pszCap,OLCFastSpatialFilter) )        return FALSE;    else         return FALSE;}/************************************************************************//*                          FeatureTranslate()                          *//************************************************************************/OGRFeature * OGRNTFLayer::FeatureTranslate( NTFFileReader *poReader,                                            NTFRecord ** papoGroup ){    if( pfnTranslator == NULL )        return NULL;    return pfnTranslator( poReader, this, papoGroup );}/************************************************************************//*                           GetSpatialRef()                            *//************************************************************************/OGRSpatialReference *OGRNTFLayer::GetSpatialRef(){    return poDS->GetSpatialRef();}