gmlfeatureclass.cpp

GIS系统支持库Geospatial Data Abstraction Library代码.GDAL is a translator library for raster geospatial dat

{
    if( m_bHaveExtents )
    {
        *pdfXMin = m_dfXMin;
        *pdfXMax = m_dfXMax;
        *pdfYMin = m_dfYMin;
        *pdfYMax = m_dfYMax;
    }

    return m_bHaveExtents;
}

/************************************************************************/
/*                         InitializeFromXML()                          */
/************************************************************************/

int GMLFeatureClass::InitializeFromXML( CPLXMLNode *psRoot )

{
/* -------------------------------------------------------------------- */
/*      Do some rudimentary checking that this is a well formed         */
/*      node.                                                           */
/* -------------------------------------------------------------------- */
    if( psRoot == NULL 
        || psRoot->eType != CXT_Element 
        || !EQUAL(psRoot->pszValue,"GMLFeatureClass") )
    {
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "GMLFeatureClass::InitializeFromXML() called on %s node!",
                  psRoot->pszValue );
        return FALSE;
    }

    if( CPLGetXMLValue( psRoot, "Name", NULL ) == NULL )
    {
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "GMLFeatureClass has no <Name> element." );
        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Collect base info.                                              */
/* -------------------------------------------------------------------- */
    CPLFree( m_pszName );
    m_pszName = CPLStrdup( CPLGetXMLValue( psRoot, "Name", NULL ) );
    
    SetElementName( CPLGetXMLValue( psRoot, "ElementPath", m_pszName ) );

    const char *pszGPath = CPLGetXMLValue( psRoot, "GeometryElementPath", "" );
    
    if( strlen( pszGPath ) > 0 )
        SetGeometryElement( pszGPath );

/* -------------------------------------------------------------------- */
/*      Collect dataset specific info.                                  */
/* -------------------------------------------------------------------- */
    CPLXMLNode *psDSI = CPLGetXMLNode( psRoot, "DatasetSpecificInfo" );
    if( psDSI != NULL )
    {
        const char *pszValue;

        pszValue = CPLGetXMLValue( psDSI, "FeatureCount", NULL );
        if( pszValue != NULL )
            SetFeatureCount( atoi(pszValue) );

        // Eventually we should support XML subtrees.
        pszValue = CPLGetXMLValue( psDSI, "ExtraInfo", NULL );
        if( pszValue != NULL )
            SetExtraInfo( pszValue );

        if( CPLGetXMLValue( psDSI, "ExtentXMin", NULL ) != NULL 
            && CPLGetXMLValue( psDSI, "ExtentXMax", NULL ) != NULL
            && CPLGetXMLValue( psDSI, "ExtentYMin", NULL ) != NULL
            && CPLGetXMLValue( psDSI, "ExtentYMax", NULL ) != NULL )
        {
            SetExtents( atof(CPLGetXMLValue( psDSI, "ExtentXMin", "0.0" )),
                        atof(CPLGetXMLValue( psDSI, "ExtentXMax", "0.0" )),
                        atof(CPLGetXMLValue( psDSI, "ExtentYMin", "0.0" )),
                        atof(CPLGetXMLValue( psDSI, "ExtentYMax", "0.0" )) );
        }
    }
    
/* -------------------------------------------------------------------- */
/*      Collect property definitions.                                   */
/* -------------------------------------------------------------------- */
    for( CPLXMLNode *psThis = psRoot->psChild;
         psThis != NULL; psThis = psThis->psNext )
    {
        if( EQUAL(psThis->pszValue, "PropertyDefn") )
        {
            const char *pszName = CPLGetXMLValue( psThis, "Name", NULL );
            const char *pszType = CPLGetXMLValue( psThis, "Type", "Untyped" );
            GMLPropertyDefn *poPDefn;

            if( pszName == NULL )
            {
                CPLError( CE_Failure, CPLE_AppDefined, 
                          "GMLFeatureClass %s has a PropertyDefn without a <Name>..",
                          m_pszName );
                return FALSE;
            }

            poPDefn = new GMLPropertyDefn( 
                pszName, CPLGetXMLValue( psThis, "ElementPath", NULL ) );
            
            if( EQUAL(pszType,"Untyped") )
                poPDefn->SetType( GMLPT_Untyped );
            else if( EQUAL(pszType,"String") )
                poPDefn->SetType( GMLPT_String );
            else if( EQUAL(pszType,"Integer") )
                poPDefn->SetType( GMLPT_Integer );
            else if( EQUAL(pszType,"Real") )
                poPDefn->SetType( GMLPT_Real );
            else if( EQUAL(pszType,"Complex") )
                poPDefn->SetType( GMLPT_Complex );
            else
            {
                CPLError( CE_Failure, CPLE_AppDefined, 
                          "Unrecognised property type %s.", 
                          pszType );
                return FALSE;
            }

            AddProperty( poPDefn );
        }
    }

    return TRUE;
}

/************************************************************************/
/*                           SerializeToXML()                           */
/************************************************************************/

CPLXMLNode *GMLFeatureClass::SerializeToXML()

{
    CPLXMLNode  *psRoot;
    int         iProperty;

/* -------------------------------------------------------------------- */
/*      Set feature class and core information.                         */
/* -------------------------------------------------------------------- */
    psRoot = CPLCreateXMLNode( NULL, CXT_Element, "GMLFeatureClass" );

    CPLCreateXMLElementAndValue( psRoot, "Name", GetName() );
    CPLCreateXMLElementAndValue( psRoot, "ElementPath", GetElementName() );
    if( GetGeometryElement() != NULL && strlen(GetGeometryElement()) > 0 )
        CPLCreateXMLElementAndValue( psRoot, "GeometryElementPath", 
                                     GetGeometryElement() );

/* -------------------------------------------------------------------- */
/*      Write out dataset specific information.                         */
/* -------------------------------------------------------------------- */
    CPLXMLNode *psDSI;

    if( m_bHaveExtents || m_nFeatureCount != -1 || m_pszExtraInfo != NULL )
    {
        psDSI = CPLCreateXMLNode( psRoot, CXT_Element, "DatasetSpecificInfo" );

        if( m_nFeatureCount != -1 )
        {
            char szValue[128];

            sprintf( szValue, "%d", m_nFeatureCount );
            CPLCreateXMLElementAndValue( psDSI, "FeatureCount", szValue );
        }

        if( m_bHaveExtents )
        {
            char szValue[128];

            sprintf( szValue, "%.5f", m_dfXMin );
            CPLCreateXMLElementAndValue( psDSI, "ExtentXMin", szValue );

            sprintf( szValue, "%.5f", m_dfXMax );
            CPLCreateXMLElementAndValue( psDSI, "ExtentXMax", szValue );

            sprintf( szValue, "%.5f", m_dfYMin );
            CPLCreateXMLElementAndValue( psDSI, "ExtentYMin", szValue );

            sprintf( szValue, "%.5f", m_dfYMax );
            CPLCreateXMLElementAndValue( psDSI, "ExtentYMax", szValue );
        }

        if( m_pszExtraInfo )
            CPLCreateXMLElementAndValue( psDSI, "ExtraInfo", m_pszExtraInfo );
    }
    
/* -------------------------------------------------------------------- */
/*      emit property information.                                      */
/* -------------------------------------------------------------------- */
    for( iProperty = 0; iProperty < GetPropertyCount(); iProperty++ )
    {
        GMLPropertyDefn *poPDefn = GetProperty( iProperty );
        CPLXMLNode *psPDefnNode;
        const char *pszTypeName;

        psPDefnNode = CPLCreateXMLNode( psRoot, CXT_Element, "PropertyDefn" );
        CPLCreateXMLElementAndValue( psPDefnNode, "Name", 
                                     poPDefn->GetName() );
        CPLCreateXMLElementAndValue( psPDefnNode, "ElementPath", 
                                     poPDefn->GetSrcElement() );
        switch( poPDefn->GetType() )
        {
          case GMLPT_Untyped:
            pszTypeName = "Untyped";
            break;
            
          case GMLPT_String:
            pszTypeName = "String";
            break;
            
          case GMLPT_Integer:
            pszTypeName = "Integer";
            break;
            
          case GMLPT_Real:
            pszTypeName = "Real";
            break;
            
          case GMLPT_Complex:
            pszTypeName = "Complex";
            break;
        }

        CPLCreateXMLElementAndValue( psPDefnNode, "Type", pszTypeName );
    }

    return psRoot;
}