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# Copyright (c) 2004 by Intevation GmbH |
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# Authors: |
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# Martin Schulze <[email protected]> |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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|
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""" |
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Maintain WMS Capabilities |
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|
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Inherits methods from WMSCapabilitiesParser |
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|
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class WMSCapabilities: |
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__init__ (resource xor filename xor nothing) |
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|
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getErrorMsg() |
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|
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fetchCapabilities(resource) |
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saveCapabilities(filename) |
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loadCapabilities(filename) |
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printCapabilities() |
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|
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getVersion() |
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|
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Requirements: |
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- PyOGCLib <http://www.sourceforge.net/projects/pyogclib> |
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|
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Requires the ogclib installed regularily on the system or checked out |
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next to the Thuban checkout. |
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|
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If this module is executed solitarily, it will fetch the capabilities |
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of the frida service and store them in the local file |
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frida_capabilities.xml for later processing. |
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|
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""" |
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|
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__version__ = "$Revision$" |
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# $Source$ |
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# $Id$ |
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|
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import os |
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|
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# ---------------------------------------------------------------------- |
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# FIXME: Temporary code until PyOGCLib is a standard requirement |
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|
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from sys import path |
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|
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# Assume the PyOGCLib to be checked out next to the thuban main directory |
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pyogclib = "../../../PyOGCLib" |
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if os.path.isdir(pyogclib) and os.path.isdir(pyogclib + "/ogclib"): |
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path.insert(0, pyogclib) |
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|
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# We use gettext, so we need to import it and hence need to adjust the |
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# path again |
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if __name__ == "__main__": |
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path.insert(0, "../../") |
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|
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# ---------------------------------------------------------------------- |
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|
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from Thuban import _ |
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|
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from ogclib.WMSClient import WMSClient |
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from parser import WMSCapabilitiesParser |
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|
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class WMSCapabilities(WMSClient, WMSCapabilitiesParser): |
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""" |
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Thuban class to maintain capabilities. This class provides |
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methods to fetch, save and load capabilities as well as methods to |
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retrieve particular information from the fetched or loaded |
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capabilities XML. |
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|
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If an error occured during processing an error text is assigned to |
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self.errorMsg. If everything went fine, this variable is set to |
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None. The current value can be retrieved by the getErrorMsg() |
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method. |
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""" |
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|
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capabilities = None |
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errorMsg = None |
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wmsVersion = None |
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|
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def __init__(self, *parm): |
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""" |
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Initialises Capabilities with one optional parameter |
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param can be either a URL or a filename: |
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filename -- load capabilities from file |
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url -- fetch capabilities from network |
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""" |
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|
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if parm and parm[0]: |
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if os.path.isfile(parm[0]): |
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self.loadCapabilities(parm[0]) |
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else: |
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if parm[0].find("http://", 0) == 0: |
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self.fetchCapabilities(parm[0]) |
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else: |
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self.errorMsg \ |
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= _("Resource '%s' is neither local file nor URL") \ |
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% parm[0] |
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|
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|
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def getErrorMsg(self): |
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return self.errorMsg |
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|
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def fetchCapabilities(self, resource): |
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""" |
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Fetches the WMS capabilities from an Internet resource |
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WMS Protocol version 1.1 is tried first, then 1.0. The |
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protocol version used can be queried by the getVersion() |
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method for later use. If both tries fail, errorMsg will be |
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set accordingly, which can be fetched with getErrorMsg(). |
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""" |
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|
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self.wmsVersion = "1.1" |
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self.capabilities = self.getCapabilities(resource, self.wmsVersion) |
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if not self.capabilities: |
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self.wmsVersion = "1.0" |
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self.capabilities = self.getCapabilities(resource, self.wmsVersion) |
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if not self.capabilities: |
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self.wmsVersion = None |
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self.errorMsg \ |
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= _("Resource '%s' " |
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"does support neither WMS version 1.1 nor 1.0") \ |
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% resource |
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|
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if self.capabilities: |
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self.grok(self.capabilities) |
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|
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|
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def saveCapabilities(self, fname): |
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"""Save capabilities to local file""" |
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|
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if self.capabilities is None: |
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self.errorMsg = _("No capabilities available") |
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else: |
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try: |
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out = open(fname, "w") |
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out.write(self.capabilities) |
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out.close() |
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except IOError: |
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self.errorMsg = _("Can't open file '%s' for writing") % fname |
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|
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|
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def loadCapabilities(self, fname): |
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"""Load capabilities from a local file""" |
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|
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try: |
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input = open(fname, "r") |
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self.capabilities = input.read() |
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input.close() |
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self.grok(self.capabilities) |
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except IOError: |
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self.errorMsg = _("Can't open file '%s' for reading") % fname |
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|
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|
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def printCapabilities(self): |
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"""Prints capabilities to stdout""" |
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print self.capabilities |
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|
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def getVersion(self): |
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""" |
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Returns the WMS protocol version |
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If no capabilities could be fetched, None is returned. |
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""" |
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return self.wmsVersion |
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|
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|
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if __name__ == "__main__": |
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capabilities \ |
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= WMSCapabilities("http://frida.intevation.org/cgi-bin/frida_wms?") |
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if capabilities.getErrorMsg() is None: |
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capabilities.saveCapabilities("frida_capabilities.xml") |
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else: |
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print "Error: " + capabilities.getErrorMsg() |
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