driver.py :  » Content-Management-Systems » PyLucid » PyLucid_standalone » django » contrib » gis » gdal » Python Open Source

Home
Python Open Source
1.3.1.2 Python
2.Ajax
3.Aspect Oriented
4.Blog
5.Build
6.Business Application
7.Chart Report
8.Content Management Systems
9.Cryptographic
10.Database
11.Development
12.Editor
13.Email
14.ERP
15.Game 2D 3D
16.GIS
17.GUI
18.IDE
19.Installer
20.IRC
21.Issue Tracker
22.Language Interface
23.Log
24.Math
25.Media Sound Audio
26.Mobile
27.Network
28.Parser
29.PDF
30.Project Management
31.RSS
32.Search
33.Security
34.Template Engines
35.Test
36.UML
37.USB Serial
38.Web Frameworks
39.Web Server
40.Web Services
41.Web Unit
42.Wiki
43.Windows
44.XML
Python Open Source » Content Management Systems » PyLucid 
PyLucid » PyLucid_standalone » django » contrib » gis » gdal » driver.py
# prerequisites imports 
from ctypes import c_void_p
from django.contrib.gis.gdal.base import GDALBase
from django.contrib.gis.gdal.error import OGRException
from django.contrib.gis.gdal.prototypes import ds

# For more information, see the OGR C API source code:
#  http://www.gdal.org/ogr/ogr__api_8h.html
#
# The OGR_Dr_* routines are relevant here.
class Driver(GDALBase):
    "Wraps an OGR Data Source Driver."

    # Case-insensitive aliases for OGR Drivers.
    _alias = {'esri' : 'ESRI Shapefile',
              'shp' : 'ESRI Shapefile',
              'shape' : 'ESRI Shapefile',
              'tiger' : 'TIGER',
              'tiger/line' : 'TIGER',
              }
                
    def __init__(self, dr_input):
        "Initializes an OGR driver on either a string or integer input."

        if isinstance(dr_input, basestring):
            # If a string name of the driver was passed in
            self._register()

            # Checking the alias dictionary (case-insensitive) to see if an alias
            #  exists for the given driver.
            if dr_input.lower() in self._alias:
                name = self._alias[dr_input.lower()]
            else:
                name = dr_input

            # Attempting to get the OGR driver by the string name.
            dr = capi.get_driver_by_name(name)
        elif isinstance(dr_input, int):
            self._register()
            dr = capi.get_driver(dr_input)
        elif isinstance(dr_input, c_void_p):
            dr = dr_input
        else:
            raise OGRException('Unrecognized input type for OGR Driver: %s' % str(type(dr_input)))

        # Making sure we get a valid pointer to the OGR Driver
        if not dr:
            raise OGRException('Could not initialize OGR Driver on input: %s' % str(dr_input))
        self.ptr = dr

    def __str__(self):
        "Returns the string name of the OGR Driver."
        return capi.get_driver_name(self.ptr)

    def _register(self):
        "Attempts to register all the data source drivers."
        # Only register all if the driver count is 0 (or else all drivers
        # will be registered over and over again)
        if not self.driver_count: capi.register_all()
                    
    # Driver properties
    @property
    def driver_count(self):
        "Returns the number of OGR data source drivers registered."
        return capi.get_driver_count()
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.