Source Code for Module eoxserver.services.ows.wcs.wcs20.desccov

  1  #------------------------------------------------------------------------------- 
  2  # $Id: desccov.py 2224 2013-02-01 14:30:32Z schindlerf $ 
  3  # 
  4  # Project: EOxServer <http://eoxserver.org> 
  5  # Authors: Stephan Krause <stephan.krause@eox.at> 
  6  #          Stephan Meissl <stephan.meissl@eox.at> 
  7  # 
  8  #------------------------------------------------------------------------------- 
  9  # Copyright (C) 2011 EOX IT Services GmbH 
 10  # 
 11  # Permission is hereby granted, free of charge, to any person obtaining a copy 
 12  # of this software and associated documentation files (the "Software"), to deal 
 13  # in the Software without restriction, including without limitation the rights 
 14  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell  
 15  # copies of the Software, and to permit persons to whom the Software is  
 16  # furnished to do so, subject to the following conditions: 
 17  # 
 18  # The above copyright notice and this permission notice shall be included in all 
 19  # copies of this Software or works derived from this Software. 
 20  # 
 21  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 22  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 23  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 24  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 25  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 26  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 27  # THE SOFTWARE. 
 28  #------------------------------------------------------------------------------- 
 29   
 30  """ 
 31  This module contains the handler for WCS 2.0 / EO-WCS DescribeCoverage requests. 
 32  """ 
 33   
 34  from eoxserver.core.system import System 
 35  from eoxserver.core.util.xmltools import DOMElementToXML 
 36  from eoxserver.services.base import BaseRequestHandler 
 37  from eoxserver.services.requests import Response 
 38  from eoxserver.services.exceptions import InvalidRequestException 
 39  from eoxserver.services.ows.wcs.encoders import WCS20EOAPEncoder 
 40   
 41 -class WCS20DescribeCoverageHandler(BaseRequestHandler): 
 42      """ 
 43      This handler generates responses to WCS 2.0 / EO-WCS DescribeCoverage 
 44      requests. It inherits directly from :class:`~.BaseRequestHandler` and 
 45      does NOT reuse MapServer. 
 46       
 47      The workflow implemented by the handler starts with the 
 48      :meth:`createCoverages` method and generates the coverage descriptions 
 49      using the :class:`~.WCS20EOAPEncoder` method 
 50      :meth:`~.WCS20EOAPEncoder.encodeCoverageDescriptions`. 
 51      """ 
 52       
 53      REGISTRY_CONF = { 
 54          "name": "WCS 2.0 DescribeCoverage Handler", 
 55          "impl_id": "services.ows.wcs20.WCS20DescribeCoverageHandler", 
 56          "registry_values": { 
 57              "services.interfaces.service": "wcs", 
 58              "services.interfaces.version": "2.0.0", 
 59              "services.interfaces.operation": "describecoverage" 
 60          } 
 61      } 
 62       
 63      PARAM_SCHEMA = { 
 64          "service": {"xml_location": "/@service", "xml_type": "string", "kvp_key": "service", "kvp_type": "string"}, 
 65          "version": {"xml_location": "/@version", "xml_type": "string", "kvp_key": "version", "kvp_type": "string"}, 
 66          "operation": {"xml_location": "/", "xml_type": "localName", "kvp_key": "request", "kvp_type": "string"}, 
 67          "coverageids": {"xml_location": "/{http://www.opengis.net/wcs/2.0}CoverageId", "xml_type": "string[]", "kvp_key": "coverageid", "kvp_type": "stringlist"} 
 68      } 
 69       
 70 -    def _processRequest(self, req): 
 71          req.setSchema(self.PARAM_SCHEMA) 
 72   
 73          self.createCoverages(req) 
 74           
 75          encoder = WCS20EOAPEncoder() 
 76           
 77          return Response( 
 78              content=DOMElementToXML(encoder.encodeCoverageDescriptions(req.coverages, True)), # TODO: Distinguish between encodeEOCoverageDescriptions and encodeCoverageDescription? 
 79              content_type="text/xml", 
 80              status=200 
 81          ) 
 82   
 83 -    def createCoverages(self, req): 
 84          """ 
 85          This method retrieves the coverage metadata for the coverages denoted 
 86          by the coverageid parameter of the request. It raises an 
 87          :exc:`~.InvalidRequestException` if the coverageid parameter is 
 88          missing or if it contains an unknown coverage ID. 
 89          """ 
 90          coverage_ids = req.getParamValue("coverageids") 
 91           
 92          if coverage_ids is None: 
 93              raise InvalidRequestException("Missing 'coverageid' parameter.", "MissingParameterValue", "coverageid") 
 94          else: 
 95              for coverage_id in coverage_ids: 
 96                  coverage = System.getRegistry().getFromFactory( 
 97                      "resources.coverages.wrappers.EOCoverageFactory", 
 98                      {"obj_id": coverage_id} 
 99                  ) 
100                  if coverage is None: 
101                      raise InvalidRequestException( 
102                          "No coverage with coverage id '%s' found" % coverage_id, 
103                          "NoSuchCoverage", 
104                          coverage_id 
105                      ) 
106                   
107                  req.coverages.append(coverage) 
108   
109 -class WCS20CorrigendumDescribeCoverageHandler(WCS20DescribeCoverageHandler): 
110      REGISTRY_CONF = { 
111          "name": "WCS 2.0 DescribeCoverage Handler", 
112          "impl_id": "services.ows.wcs20.WCS20CorrigendumDescribeCoverageHandler", 
113          "registry_values": { 
114              "services.interfaces.service": "wcs", 
115              "services.interfaces.version": "2.0.1", 
116              "services.interfaces.operation": "describecoverage" 
117          } 
118      } 
119