/[thuban]/trunk/thuban/Extensions/wms/parser.py
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Diff of /trunk/thuban/Extensions/wms/parser.py

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revision 2133 by joey, Wed Mar 24 19:31:54 2004 UTC revision 2164 by joey, Tue Apr 13 13:15:22 2004 UTC
# Line 89  class WMSCapabilitiesParser: Line 89  class WMSCapabilitiesParser:
89          Information should only be retrieved with the respective          Information should only be retrieved with the respective
90          get*() methods.          get*() methods.
91          """          """
92          root = xml.dom.minidom.parseString(data).documentElement          xml_dom = xml.dom.minidom.parseString(data)
93            root = xml_dom.documentElement
94    
95          # Extract the title          # Extract the title
96          foo = getElementByName(getElementByName(root, 'Service'), 'Title')          foo = getElementByName(getElementByName(root, 'Service'), 'Title')
# Line 104  class WMSCapabilitiesParser: Line 105  class WMSCapabilitiesParser:
105          # Extract fees information          # Extract fees information
106          foo = getElementByName(getElementByName(root, 'Service'), 'Fees')          foo = getElementByName(getElementByName(root, 'Service'), 'Fees')
107          if foo and len(foo.childNodes[0].data) \          if foo and len(foo.childNodes[0].data) \
108                 and lower(foo.childNodes[0].data) != 'none':                 and foo.childNodes[0].data.lower() != 'none':
109              self.fees = foo.childNodes[0].data              self.fees = foo.childNodes[0].data
110                    
111          # Extract access information          # Extract access information
112          foo = getElementByName(getElementByName(root, 'Service'),          foo = getElementByName(getElementByName(root, 'Service'),
113                                 'AccessConstraints')                                 'AccessConstraints')
114          if foo and len(foo.childNodes[0].data) \          if foo and len(foo.childNodes[0].data) \
115                 and lower(foo.childNodes[0].data) != 'none':                 and foo.childNodes[0].data.lower() != 'none':
116              self.access = foo.childNodes[0].data              self.access = foo.childNodes[0].data
117                    
118          # Extract output format information          # Extract output format information
# Line 125  class WMSCapabilitiesParser: Line 126  class WMSCapabilitiesParser:
126          self.peekLayers(getElementByName(getElementByName(          self.peekLayers(getElementByName(getElementByName(
127              root, 'Capability'), 'Layer'), -1)              root, 'Capability'), 'Layer'), -1)
128    
129            xml_dom.unlink()
130    
131    
132      def peekLayers(self, top, parent):      def peekLayers(self, top, parent):
133          """          """
# Line 183  class WMSCapabilitiesParser: Line 186  class WMSCapabilitiesParser:
186                  self.layers[index]['bbox'][srs][corner] \                  self.layers[index]['bbox'][srs][corner] \
187                      = foo.attributes.get(corner).nodeValue                      = foo.attributes.get(corner).nodeValue
188                            
         # Check for integrity  
         self.checkLayerSRS(index)  
   
189          # Traverse subsidiary layers          # Traverse subsidiary layers
190          sublayer = getElementsByName(top, 'Layer')          sublayer = getElementsByName(top, 'Layer')
191          for l in sublayer:          for l in sublayer:
192              self.peekLayers(l, index)              self.peekLayers(l, index)
193    
194    
     def checkLayerSRS(self, index):  
         """  
         Checks the integrity of the underlying XML data.  
   
         This is done by comparing the <SRS> elements with the  
         calculated list from the BoundingBox elements.  
   
         index -- position in the layers array to check  
         """  
   
         pivot = index  
         calculated = []  
         while pivot != -1:  
             if 'bbox' in self.layers[pivot]:  
                 for srs in self.layers[pivot]['bbox'].keys():  
                     if srs not in calculated:  
                         calculated.append(srs)  
             pivot = self.layers[pivot]['parent']  
   
         pivot = index  
         specified = []  
         while pivot != -1:  
             if 'srs' in self.layers[pivot]:  
                 for srs in self.layers[pivot]['srs']:  
                     if srs not in specified:  
                         specified.append(srs)  
             pivot = self.layers[pivot]['parent']  
   
         equal = True  
         # Check for same number of elements  
         if len(calculated) != len(specified):  
             equal = False  
   
         # Loop through all elements for existance  
         for elm in calculated:  
             if elm not in specified:  
                 equal = False  
   
         if not equal:  
             if self.srs_discrepancies is None:  
                 self.srs_discrepancies = []  
             if 'name' in self.layers[index]:  
                 id = "name:%s" % self.layers[index]['name']  
             else:  
                 id = "title:%s" % self.layers[index]['title']  
             self.srs_discrepancies.append(id)  
   
   
195      def getTitle(self):      def getTitle(self):
196          """          """
197          Returns the main title of the WMS object.          Returns the main title of the WMS object.
# Line 385  class WMSCapabilitiesParser: Line 337  class WMSCapabilitiesParser:
337          - Layers may optionally add to the global SRS list, or to the          - Layers may optionally add to the global SRS list, or to the
338            list inherited from a parent layer.            list inherited from a parent layer.
339    
340            - A server which has the ability to transform data to
341              different SRSes may choose not to provide an explicit
342              BoundingBox for every possible SRS available for each Layer.
343              Thus the list of <SRS> elements are authoritative.
344    
345          This implementation returns the list of SRS for the given          This implementation returns the list of SRS for the given
346          layer, calculated by looking at BoundingBoxes defined in the          layer, calculated by looking at BoundingBoxes defined in the
347          named layer and all layers higher in the hierarchy up to the          named layer and all layers higher in the hierarchy up to the
# Line 400  class WMSCapabilitiesParser: Line 357  class WMSCapabilitiesParser:
357    
358          result = []          result = []
359          while pivot != -1:          while pivot != -1:
360              if 'bbox' in self.layers[pivot]:              if 'srs' in self.layers[pivot]:
361                  for srs in self.layers[pivot]['bbox'].keys():                  for srs in self.layers[pivot]['srs']:
362                      if srs not in result:                      if srs not in result:
363                          result.append(srs)                          result.append(srs)
364              pivot = self.layers[pivot]['parent']              pivot = self.layers[pivot]['parent']
# Line 525  if __name__ == "__main__": Line 482  if __name__ == "__main__":
482    
483      import os      import os
484    
485        sample = "test/sample.xml"
486      try:      try:
487          f = open("test/sample.xml", "r")          f = open(sample, "r")
488      except IOError:      except IOError:
489          try:          try:
490              f = open(os.path.dirname(__file__) + "/test/sample.xml", "r")              f = open(os.path.dirname(__file__) + "/" + sample, "r")
491          except IOError:          except IOError:
492              print "Cannot open sample.xml for reading"              print "Cannot open %s for reading" % sample
493    
494      if f is not None:      if f is not None:
495          sample = f.read();          sample = f.read();
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