/[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 2165 by joey, Tue Apr 13 16:42:48 2004 UTC
# Line 52  import xml.dom.minidom Line 52  import xml.dom.minidom
52    
53  from domutils import getElementsByName, getElementByName  from domutils import getElementsByName, getElementByName
54    
55    from Thuban import _
56    
57  class WMSCapabilitiesParser:  class WMSCapabilitiesParser:
58      """      """
59      Thuban class to parse capabilities supplied as large string.      Thuban class to parse capabilities supplied as large string.
# Line 68  class WMSCapabilitiesParser: Line 70  class WMSCapabilitiesParser:
70      access = None      access = None
71      formats = None      formats = None
72      srs_discrepancies = None      srs_discrepancies = None
73        error = None
74    
75    
76      def __init__(self):      def __init__(self):
# Line 78  class WMSCapabilitiesParser: Line 81  class WMSCapabilitiesParser:
81          # Note that we must not initialise internal variables of the          # Note that we must not initialise internal variables of the
82          # class in a mutable way or it will be shared among all          # class in a mutable way or it will be shared among all
83          # instances.  None is immutable, [] is not.          # instances.  None is immutable, [] is not.
84          layers = []          self.error = []
85    
86    
87      def grok(self, data):      def grok(self, data):
# Line 89  class WMSCapabilitiesParser: Line 92  class WMSCapabilitiesParser:
92          Information should only be retrieved with the respective          Information should only be retrieved with the respective
93          get*() methods.          get*() methods.
94          """          """
95          root = xml.dom.minidom.parseString(data).documentElement          xml_dom = xml.dom.minidom.parseString(data)
96            root = xml_dom.documentElement
97    
98          # Extract the title          # Extract the title
99          foo = getElementByName(getElementByName(root, 'Service'), 'Title')          foo = getElementByName(getElementByName(root, 'Service'), 'Title')
# Line 104  class WMSCapabilitiesParser: Line 108  class WMSCapabilitiesParser:
108          # Extract fees information          # Extract fees information
109          foo = getElementByName(getElementByName(root, 'Service'), 'Fees')          foo = getElementByName(getElementByName(root, 'Service'), 'Fees')
110          if foo and len(foo.childNodes[0].data) \          if foo and len(foo.childNodes[0].data) \
111                 and lower(foo.childNodes[0].data) != 'none':                 and foo.childNodes[0].data.lower() != 'none':
112              self.fees = foo.childNodes[0].data              self.fees = foo.childNodes[0].data
113                    
114          # Extract access information          # Extract access information
115          foo = getElementByName(getElementByName(root, 'Service'),          foo = getElementByName(getElementByName(root, 'Service'),
116                                 'AccessConstraints')                                 'AccessConstraints')
117          if foo and len(foo.childNodes[0].data) \          if foo and len(foo.childNodes[0].data) \
118                 and lower(foo.childNodes[0].data) != 'none':                 and foo.childNodes[0].data.lower() != 'none':
119              self.access = foo.childNodes[0].data              self.access = foo.childNodes[0].data
120                    
121          # Extract output format information          # Extract output format information
# Line 125  class WMSCapabilitiesParser: Line 129  class WMSCapabilitiesParser:
129          self.peekLayers(getElementByName(getElementByName(          self.peekLayers(getElementByName(getElementByName(
130              root, 'Capability'), 'Layer'), -1)              root, 'Capability'), 'Layer'), -1)
131    
132            xml_dom.unlink()
133    
134    
135      def peekLayers(self, top, parent):      def peekLayers(self, top, parent):
136          """          """
# Line 149  class WMSCapabilitiesParser: Line 155  class WMSCapabilitiesParser:
155          foo = getElementByName(top, 'Title')          foo = getElementByName(top, 'Title')
156          if foo and len(foo.childNodes[0].data):          if foo and len(foo.childNodes[0].data):
157              self.layers[index]['title'] = foo.childNodes[0].data              self.layers[index]['title'] = foo.childNodes[0].data
158            else:
159                # A <Title> is required for each layer, <name> is optional
160                # See OGC 01-068r3, 7.1.4.5.1 and 7.1.4.5.2
161                self.error.append(_("No title found for layer #%d") % index)
162    
163          foo = getElementByName(top, 'Name')          foo = getElementByName(top, 'Name')
164          if foo and len(foo.childNodes[0].data):          if foo and len(foo.childNodes[0].data):
# Line 183  class WMSCapabilitiesParser: Line 193  class WMSCapabilitiesParser:
193                  self.layers[index]['bbox'][srs][corner] \                  self.layers[index]['bbox'][srs][corner] \
194                      = foo.attributes.get(corner).nodeValue                      = foo.attributes.get(corner).nodeValue
195                            
         # Check for integrity  
         self.checkLayerSRS(index)  
   
196          # Traverse subsidiary layers          # Traverse subsidiary layers
197          sublayer = getElementsByName(top, 'Layer')          sublayer = getElementsByName(top, 'Layer')
198          for l in sublayer:          for l in sublayer:
199              self.peekLayers(l, index)              self.peekLayers(l, index)
200    
201    
     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)  
   
   
202      def getTitle(self):      def getTitle(self):
203          """          """
204          Returns the main title of the WMS object.          Returns the main title of the WMS object.
# Line 385  class WMSCapabilitiesParser: Line 344  class WMSCapabilitiesParser:
344          - Layers may optionally add to the global SRS list, or to the          - Layers may optionally add to the global SRS list, or to the
345            list inherited from a parent layer.            list inherited from a parent layer.
346    
347            - A server which has the ability to transform data to
348              different SRSes may choose not to provide an explicit
349              BoundingBox for every possible SRS available for each Layer.
350              Thus the list of <SRS> elements are authoritative.
351    
352          This implementation returns the list of SRS for the given          This implementation returns the list of SRS for the given
353          layer, calculated by looking at BoundingBoxes defined in the          layer, calculated by looking at BoundingBoxes defined in the
354          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 364  class WMSCapabilitiesParser:
364    
365          result = []          result = []
366          while pivot != -1:          while pivot != -1:
367              if 'bbox' in self.layers[pivot]:              if 'srs' in self.layers[pivot]:
368                  for srs in self.layers[pivot]['bbox'].keys():                  for srs in self.layers[pivot]['srs']:
369                      if srs not in result:                      if srs not in result:
370                          result.append(srs)                          result.append(srs)
371              pivot = self.layers[pivot]['parent']              pivot = self.layers[pivot]['parent']
# Line 525  if __name__ == "__main__": Line 489  if __name__ == "__main__":
489    
490      import os      import os
491    
492        sample = "test/sample.xml"
493      try:      try:
494          f = open("test/sample.xml", "r")          f = open(sample, "r")
495      except IOError:      except IOError:
496          try:          try:
497              f = open(os.path.dirname(__file__) + "/test/sample.xml", "r")              f = open(os.path.dirname(__file__) + "/" + sample, "r")
498          except IOError:          except IOError:
499              print "Cannot open sample.xml for reading"              print "Cannot open %s for reading" % sample
500    
501      if f is not None:      if f is not None:
502          sample = f.read();          sample = f.read();
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