/[thuban]/branches/WIP-pyshapelib-bramz/Extensions/wms/capabilities.py
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revision 2137 by joey, Wed Mar 24 20:07:34 2004 UTC revision 2151 by joey, Thu Apr 1 14:41:35 2004 UTC
# Line 19  Line 19 
19  """  """
20  Maintain WMS Capabilities  Maintain WMS Capabilities
21    
22    Inherits methods from WMSCapabilitiesParser
23    
24  class WMSCapabilities:  class WMSCapabilities:
25      __init__ (resource xor filename xor nothing)      __init__ (resource xor filename xor nothing)
26    
27      getErrorMsg()      getErrorMsg()
28    
29      fetchCapabilities(*resource)      fetchCapabilities(resource)
30      saveCapabilities(filename)      saveCapabilities(filename)
31      loadCapabilities(filename)      loadCapabilities(filename)
32      printCapabilities()      printCapabilities()
33    
34        getVersion()
35    
36  Requirements:  Requirements:
37      - PyOGCLib <http://www.sourceforge.net/projects/pyogclib>      - PyOGCLib <http://www.sourceforge.net/projects/pyogclib>
38    
# Line 67  if __name__ == "__main__": Line 71  if __name__ == "__main__":
71  from Thuban import _  from Thuban import _
72    
73  from ogclib.WMSClient import WMSClient  from ogclib.WMSClient import WMSClient
74    from parser import WMSCapabilitiesParser
75    
76  class WMSCapabilities(WMSClient):  class WMSCapabilities(WMSClient, WMSCapabilitiesParser):
77      """      """
78      Thuban class to maintain capabilities.  This class provides      Thuban class to maintain capabilities.  This class provides
79      methods to fetch, save and load capabilities as well as methods to      methods to fetch, save and load capabilities as well as methods to
# Line 89  class WMSCapabilities(WMSClient): Line 94  class WMSCapabilities(WMSClient):
94          """          """
95          Initialises Capabilities with one optional parameter          Initialises Capabilities with one optional parameter
96    
97            param can be either a URL or a filename:
98    
99          filename -- load capabilities from file          filename -- load capabilities from file
100          url -- fetch capabilities from network          url -- fetch capabilities from network
101          """          """
# Line 101  class WMSCapabilities(WMSClient): Line 108  class WMSCapabilities(WMSClient):
108                      self.fetchCapabilities(parm[0])                      self.fetchCapabilities(parm[0])
109                  else:                  else:
110                      self.errorMsg \                      self.errorMsg \
111                          = _("Resource '%s' is neither local file nor URL")                          = _("Resource '%s' is neither local file nor URL") \
112                              % parm[0]                          % parm[0]
113    
114    
115      def getErrorMsg(self):      def getErrorMsg(self):
# Line 110  class WMSCapabilities(WMSClient): Line 117  class WMSCapabilities(WMSClient):
117    
118    
119      def fetchCapabilities(self, resource):      def fetchCapabilities(self, resource):
120          """Fetches the WMS capabilities from an Internet resource"""          """
121            Fetches the WMS capabilities from an Internet resource
122    
123            WMS Protocol version 1.1 is tried first, then 1.0.  The
124            protocol version used can be queried by the getVersion()
125            method for later use.  If both tries fail, errorMsg will be
126            set accordingly, which can be fetched with getErrorMsg().
127            """
128    
129          self.wmsVersion = "1.1"          self.wmsVersion = "1.1"
130          self.capabilities = self.getCapabilities(resource, self.wmsVersion)          self.capabilities = self.getCapabilities(resource, self.wmsVersion)
131          if not self.capabilities:          if not self.capabilities:
132              self.wmsVersion = "1.0"              self.wmsVersion = "1.0"
133              self.capabilities = self.getCapabilities(resource, self.wmsVersion)              self.capabilities = self.getCapabilities(resource, self.wmsVersion)
134                if not self.capabilities:
135                    self.wmsVersion = None
136                    self.errorMsg \
137                        = _("Resource '%s' "
138                            + "does support neither WMS version 1.1 nor 1.0") \
139                            % resource
140    
141            if self.capabilities:
142                self.grok(self.capabilities)
143    
144    
145      def saveCapabilities(self, fname):      def saveCapabilities(self, fname):
# Line 129  class WMSCapabilities(WMSClient): Line 152  class WMSCapabilities(WMSClient):
152                  out = open(fname, "w")                  out = open(fname, "w")
153                  out.write(self.capabilities)                  out.write(self.capabilities)
154                  out.close()                  out.close()
155              except:              except IOError:
156                  self.errorMsg = _("Can't open file '%s' for writing") % fname                  self.errorMsg = _("Can't open file '%s' for writing") % fname
157    
158    
# Line 140  class WMSCapabilities(WMSClient): Line 163  class WMSCapabilities(WMSClient):
163              input = open(fname, "r")              input = open(fname, "r")
164              self.capabilities = input.read()              self.capabilities = input.read()
165              input.close()              input.close()
166          except:              self.grok(self.capabilities)
167            except IOError:
168              self.errorMsg = _("Can't open file '%s' for reading") % fname              self.errorMsg = _("Can't open file '%s' for reading") % fname
169    
170    
# Line 150  class WMSCapabilities(WMSClient): Line 174  class WMSCapabilities(WMSClient):
174          print self.capabilities          print self.capabilities
175    
176    
177        def getVersion(self):
178            """
179            Returns the WMS protocol version
180    
181            If no capabilities could be fetched, None is returned.
182            """
183            return self.wmsVersion
184    
185    
186  if __name__ == "__main__":  if __name__ == "__main__":
187      capabilities \      capabilities \
188          = WMSCapabilities("http://frida.intevation.org/cgi-bin/frida_wms?")          = WMSCapabilities("http://frida.intevation.org/cgi-bin/frida_wms?")
189      if capa.getErrorMsg() is None:      if capabilities.getErrorMsg() is None:
190          capa.saveCapabilities("frida_capabilities.xml")          capabilities.saveCapabilities("frida_capabilities.xml")
191      else:      else:
192          print "Error: " + capa.getErrorMsg()          print "Error: " + capabilities.getErrorMsg()
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