#!/usr/bin/env python
###############################################################################
# $Id$
#
# Project:  GDAL/OGR Test Suite
# Purpose:  Test "shared" open, and various refcount based stuff.
# Author:   Frank Warmerdam <warmerdam@pobox.com>
# 
###############################################################################
# Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com>
# 
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
# 
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Library General Public License for more details.
# 
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
###############################################################################

import os
import sys

sys.path.append( '../pymod' )

import gdaltest
import ogr
import ogrtest

###############################################################################
# Open two datasets in shared mode.

def ogr_refcount_1():
    if ogr.GetOpenDSCount() != 0:
        gdaltest.post_reason( 'Initial Open DS count is not zero!' )
        return 'failed'

    gdaltest.ds_1 = ogr.OpenShared( 'data/idlink.dbf' )
    gdaltest.ds_2 = ogr.OpenShared( 'data/poly.shp' )

    if ogr.GetOpenDSCount() != 2:
        gdaltest.post_reason( 'Open DS count not 2 after shared opens.' )
        return 'failed'

    if gdaltest.ds_1.GetRefCount() != 1 or gdaltest.ds_2.GetRefCount() != 1:
        gdaltest.post_reason( 'Reference count not 1 on one of datasources.' )
        return 'failed'

    return 'success'

###############################################################################
# Verify that reopening one of the datasets returns the existing shared handle.

def ogr_refcount_2():

    ds_3 = ogr.OpenShared( 'data/idlink.dbf' )

    if ogr.GetOpenDSCount() != 2:
        gdaltest.post_reason( 'Open DS count not 2 after third open.' )
        return 'failed'

    # This test only works with the old bindings.
    try:
        if ds_3._o != gdaltest.ds_1._o:
            gdaltest.post_reason( 'We did not get the expected pointer.' )
            return 'failed'
    except:
        pass
        
    if ds_3.GetRefCount() != 2:
        gdaltest.post_reason( 'Refcount not 2 after reopened.' )
        return 'failed'

    gdaltest.ds_3 = ds_3
        
    return 'success'

###############################################################################
# Verify that releasing the datasources has the expected behaviour.

def ogr_refcount_3():

    gdaltest.ds_3.Release()

    if gdaltest.ds_1.GetRefCount() != 1:
        gdaltest.post_reason( 'Refcount not decremented as expected.' )
        return 'failed'
        
    gdaltest.ds_1.Release()

    if ogr.GetOpenDSCount() != 1:
        gdaltest.post_reason( 'Open DS count not back to one.' )
        return 'failed'

    return 'success'

###############################################################################
# Verify that we can walk the open datasource list.

def ogr_refcount_4():

    ds = ogr.GetOpenDS( 0 )
    try:
        if ds._o != gdaltest.ds_2._o:
            gdaltest.post_reason( 'failed to fetch expected datasource' )
            return 'failed'
    except:
        pass

    return 'success'

###############################################################################

def ogr_refcount_cleanup():
    gdaltest.ds_2.Release()

    if ogr.GetOpenDSCount() != 0:
        gdaltest.post_reason( 'Open DS count not back to zero.' )
        return 'failed'

    return 'success'


gdaltest_list = [ 
    ogr_refcount_1,
    ogr_refcount_2,
    ogr_refcount_3,
    ogr_refcount_4,
    ogr_refcount_cleanup ]

if __name__ == '__main__':

    gdaltest.setup_run( 'ogr_refcount' )

    gdaltest.run_tests( gdaltest_list )

    gdaltest.summarize()