ogrfeaturedefn.cpp

mitab,读取MapInfo的地图文件

/******************************************************************************
 * $Id: ogrfeaturedefn.cpp 10646 2007-01-18 02:38:10Z warmerdam $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The OGRFeatureDefn class implementation.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 1999,  Les Technologies SoftMap Inc.
 *
 * 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_feature.h"
#include "ogr_api.h"
#include "ogr_p.h"

CPL_CVSID("$Id: ogrfeaturedefn.cpp 10646 2007-01-18 02:38:10Z warmerdam $");

/************************************************************************/
/*                           OGRFeatureDefn()                           */
/************************************************************************/

/**
 * Constructor
 *
 * The OGRFeatureDefn maintains a reference count, but this starts at
 * zero.  It is mainly intended to represent a count of OGRFeature's
 * based on this definition.
 *
 * This method is the same as the C function OGR_FD_Create().
 *
 * @param pszName the name to be assigned to this layer/class.  It does not
 * need to be unique. 
 */

OGRFeatureDefn::OGRFeatureDefn( const char * pszName )

{
    pszFeatureClassName = CPLStrdup( pszName );
    nRefCount = 0;
    nFieldCount = 0;
    papoFieldDefn = NULL;
    eGeomType = wkbUnknown;
}

/************************************************************************/
/*                           OGR_FD_Create()                            */
/************************************************************************/
/**
 * Create a new feature definition object to held the field definitions.
 *
 * The OGRFeatureDefn maintains a reference count, but this starts at
 * zero, and should normally be incremented by the owner.
 *
 * This function is the same as the C++ method 
 * OGRFeatureDefn::OGRFeatureDefn().
 *
 * @param pszName the name to be assigned to this layer/class.  It does not
 * need to be unique. 
 * @return handle to the newly created feature definition.
 */

OGRFeatureDefnH OGR_FD_Create( const char *pszName )

{
    return (OGRFeatureDefnH) new OGRFeatureDefn( pszName );
}


/************************************************************************/
/*                          ~OGRFeatureDefn()                           */
/************************************************************************/

OGRFeatureDefn::~OGRFeatureDefn()

{
    if( nRefCount != 0 )
    {
        CPLDebug( "OGRFeatureDefn",
                  "OGRFeatureDefn %s with a ref count of %d deleted!\n",
                  pszFeatureClassName, nRefCount );
    }
    
    CPLFree( pszFeatureClassName );

    for( int i = 0; i < nFieldCount; i++ )
    {
        delete papoFieldDefn[i];
    }

    CPLFree( papoFieldDefn );
}

/************************************************************************/
/*                           OGR_FD_Destroy()                           */
/************************************************************************/
/**
 * Destroy a feature definition object and release all memory 
 * associated with it. 
 *
 * This function is the same as the C++ method 
 * OGRFeatureDefn::~OGRFeatureDefn().
 *
 * @param hDefn handle to the feature definition to be destroyed.
 */

void OGR_FD_Destroy( OGRFeatureDefnH hDefn )

{
    delete (OGRFeatureDefn *) hDefn;
}

/************************************************************************/
/*                              Release()                               */
/************************************************************************/

/**
 * \fn void OGRFeatureDefn::Release();
 *
 * Drop a reference to this object, and destroy if no longer referenced.
 */

void OGRFeatureDefn::Release()

{
    if( this && Dereference() == 0 )
        delete this;
}

/************************************************************************/
/*                           OGR_FD_Release()                           */
/************************************************************************/

/**
 * Drop a reference, and destroy if unreferenced.
 *
 * This function is the same as the C++ method OGRFeatureDefn::Release().
 *
 * @param hDefn handle to the feature definition to be released.
 */

void OGR_FD_Release( OGRFeatureDefnH hDefn )

{
    ((OGRFeatureDefn *) hDefn)->Release();
}

/************************************************************************/
/*                               Clone()                                */
/************************************************************************/

/**
 * \fn OGRFeatureDefn *OGRFeatureDefn::Clone();
 *
 * Create a copy of this feature definition.
 *
 * Creates a deep copy of the feature definition. 
 * 
 * @return the copy. 
 */

OGRFeatureDefn *OGRFeatureDefn::Clone()

{
    OGRFeatureDefn *poCopy;

    poCopy = new OGRFeatureDefn( GetName() );

    poCopy->SetGeomType( GetGeomType() );

    for( int i = 0; i < GetFieldCount(); i++ )
        poCopy->AddFieldDefn( GetFieldDefn( i ) );

    return poCopy;
}

/************************************************************************/
/*                              GetName()                               */
/************************************************************************/

/**
 * \fn const char *OGRFeatureDefn::GetName();
 *
 * Get name of this OGRFeatureDefn.
 *
 * This method is the same as the C function OGR_FD_GetName().
 *
 * @return the name.  This name is internal and should not be modified, or
 * freed.
 */

/************************************************************************/
/*                           OGR_FD_GetName()                           */
/************************************************************************/
/**
 * Get name of the OGRFeatureDefn passed as an argument.
 *
 * This function is the same as the C++ method OGRFeatureDefn::GetName().
 *
 * @param hDefn handle to the feature definition to get the name from.
 * @return the name.  This name is internal and should not be modified, or
 * freed.
 */

const char *OGR_FD_GetName( OGRFeatureDefnH hDefn )

{
    return ((OGRFeatureDefn *) hDefn)->GetName();
}

/************************************************************************/
/*                           GetFieldCount()                            */
/************************************************************************/

/**
 * \fn int OGRFeatureDefn::GetFieldCount();
 *
 * Fetch number of fields on this feature.
 *
 * This method is the same as the C function OGR_FD_GetFieldCount().
 * @return count of fields.
 */

/************************************************************************/
/*                        OGR_FD_GetFieldCount()                        */
/************************************************************************/

/**
 * Fetch number of fields on the passed feature definition.
 *
 * This function is the same as the C++ OGRFeatureDefn::GetFieldCount().
 *
 * @param hDefn handle to the feature definition to get the fields count from.
 * @return count of fields.
 */

int OGR_FD_GetFieldCount( OGRFeatureDefnH hDefn )

{
    return ((OGRFeatureDefn *) hDefn)->GetFieldCount();
}

/************************************************************************/
/*                            GetFieldDefn()                            */
/************************************************************************/

/**
 * Fetch field definition.
 *
 * This method is the same as the C function OGR_FD_GetFieldDefn().
 *
 * @param iField the field to fetch, between 0 and GetFieldCount()-1.
 *
 * @return a pointer to an internal field definition object.  This object
 * should not be modified or freed by the application.
 */

OGRFieldDefn *OGRFeatureDefn::GetFieldDefn( int iField )

{
    if( iField < 0 || iField >= nFieldCount )
    {
        return NULL;
    }

    return papoFieldDefn[iField];
}

/************************************************************************/
/*                        OGR_FD_GetFieldDefn()                         */
/************************************************************************/

/**
 * Fetch field definition of the passed feature definition.
 *
 * This function is the same as the C++ method 
 * OGRFeatureDefn::GetFieldDefn().
 *
 * @param hDefn handle to the feature definition to get the field definition
 * from.
 * @param iField the field to fetch, between 0 and GetFieldCount()-1.
 *
 * @return an handle to an internal field definition object.  This object
 * should not be modified or freed by the application.
 */

OGRFieldDefnH OGR_FD_GetFieldDefn( OGRFeatureDefnH hDefn, int iField )

{
    return ((OGRFeatureDefn *) hDefn)->GetFieldDefn( iField );
}

/************************************************************************/
/*                            AddFieldDefn()                            */
/************************************************************************/

/**
 * Add a new field definition.