| 1 | #!/usr/bin/python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | # ============================================================================= |
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| 4 | # Copyright (c) 2009 Tom Kralidis |
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| 5 | # |
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| 6 | # Authors : Tom Kralidis <tomkralidis@hotmail.com> |
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| 7 | # |
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| 8 | # Contact email: tomkralidis@hotmail.com |
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| 9 | # ============================================================================= |
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| 10 | |
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| 11 | """ CSW request and response processor """ |
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| 12 | |
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| 13 | import StringIO |
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| 14 | from owslib.etree import etree |
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| 15 | from owslib.filter import * |
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| 16 | from owslib import util |
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| 17 | from owslib.ows import * |
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| 18 | from owslib.iso import * |
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| 19 | |
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| 20 | # default variables |
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| 21 | |
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| 22 | outputformat = 'application/xml' |
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| 23 | schema = 'http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd' |
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| 24 | |
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| 25 | namespaces = { |
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| 26 | None : 'http://www.opengis.net/cat/csw/2.0.2', |
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| 27 | 'csw': 'http://www.opengis.net/cat/csw/2.0.2', |
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| 28 | 'dc' : 'http://purl.org/dc/elements/1.1/', |
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| 29 | 'dct': 'http://purl.org/dc/terms/', |
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| 30 | 'gco': 'http://www.isotc211.org/2005/gco', |
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| 31 | 'gmd': 'http://www.isotc211.org/2005/gmd', |
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| 32 | 'gml': 'http://www.opengis.net/gml', |
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| 33 | 'ogc': 'http://www.opengis.net/ogc', |
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| 34 | 'ows': 'http://www.opengis.net/ows', |
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| 35 | 'rim': 'urn:oasis:names:tc:ebxml-regrep:xsd:rim:3.0', |
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| 36 | 'xs' : 'http://www.w3.org/2001/XMLSchema', |
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| 37 | 'xs2': 'http://www.w3.org/XML/Schema', |
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| 38 | 'xsi': 'http://www.w3.org/2001/XMLSchema-instance' |
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| 39 | } |
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| 40 | |
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| 41 | schema_location = '%s %s' % (namespaces['csw'], schema) |
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| 42 | |
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| 43 | class CatalogueServiceWeb: |
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| 44 | """ csw request class """ |
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| 45 | def __init__(self, url, lang='en-US', version='2.0.2'): |
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| 46 | """ |
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| 47 | |
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| 48 | Construct and process a GetCapabilities request |
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| 49 | |
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| 50 | Parameters |
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| 51 | ---------- |
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| 52 | |
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| 53 | - url: the URL of the CSW |
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| 54 | - lang: the language (default is 'en-US') |
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| 55 | - version: version (default is '2.0.2') |
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| 56 | |
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| 57 | """ |
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| 58 | |
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| 59 | self.url = url |
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| 60 | self.lang = lang |
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| 61 | self.version = version |
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| 62 | self.service = 'CSW' |
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| 63 | self.exceptionreport = None |
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| 64 | self.owscommon = OwsCommon('1.0.0') |
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| 65 | |
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| 66 | # construct request |
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| 67 | node0 = etree.Element(util.nspath('GetCapabilities', namespaces['csw'])) |
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| 68 | node0.set('service', self.service) |
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| 69 | node0.set(util.nspath('schemaLocation', namespaces['xsi']), schema_location) |
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| 70 | tmp = etree.SubElement(node0, util.nspath('AcceptVersions', namespaces['ows'])) |
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| 71 | etree.SubElement(tmp, util.nspath('Version', namespaces['ows'])).text = self.version |
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| 72 | tmp2 = etree.SubElement(node0, util.nspath('AcceptFormats', namespaces['ows'])) |
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| 73 | etree.SubElement(tmp2, util.nspath('OutputFormat', namespaces['ows'])).text = outputformat |
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| 74 | self.request = util.xml2string(etree.tostring(node0)) |
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| 75 | |
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| 76 | # invoke |
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| 77 | self.response = util.http_post(self.url, self.request, self.lang) |
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| 78 | |
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| 79 | # parse result |
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| 80 | self._capabilities = etree.parse(StringIO.StringIO(self.response)) |
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| 81 | |
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| 82 | # check for exceptions |
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| 83 | self._isexception(self._capabilities, self.owscommon.namespace) |
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| 84 | |
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| 85 | if self.exceptionreport is None: |
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| 86 | # ServiceIdentification |
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| 87 | val = self._capabilities.find(util.nspath('ServiceIdentification', namespaces['ows'])) |
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| 88 | self.identification=ServiceIdentification(val,self.owscommon.namespace) |
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| 89 | # ServiceProvider |
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| 90 | val = self._capabilities.find(util.nspath('ServiceProvider', namespaces['ows'])) |
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| 91 | self.provider=ServiceProvider(val,self.owscommon.namespace) |
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| 92 | # ServiceOperations metadata |
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| 93 | self.operations=[] |
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| 94 | for elem in self._capabilities.findall(util.nspath('OperationsMetadata/Operation', namespaces['ows'])): |
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| 95 | self.operations.append(OperationsMetadata(elem, self.owscommon.namespace)) |
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| 96 | |
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| 97 | # FilterCapabilities |
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| 98 | val = self._capabilities.find(util.nspath('Filter_Capabilities', namespaces['ogc'])) |
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| 99 | self.filters=FilterCapabilities(val) |
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| 100 | |
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| 101 | def describerecord(self, typename='csw:Record', format=outputformat): |
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| 102 | """ |
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| 103 | |
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| 104 | Construct and process DescribeRecord request |
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| 105 | |
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| 106 | Parameters |
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| 107 | ---------- |
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| 108 | |
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| 109 | - typename: the typename to describe (default is 'csw:Record') |
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| 110 | - format: the outputFormat (default is 'application/xml') |
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| 111 | |
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| 112 | """ |
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| 113 | |
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| 114 | # construct request |
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| 115 | node0 = etree.Element(util.nspath('DescribeRecord', namespaces['csw'])) |
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| 116 | node0.set('service', self.service) |
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| 117 | node0.set('version', self.version) |
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| 118 | node0.set('outputFormat', format) |
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| 119 | node0.set('schemaLanguage', namespaces['xs2']) |
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| 120 | node0.set(util.nspath('schemaLocation', namespaces['xsi']), schema_location) |
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| 121 | etree.SubElement(node0, util.nspath('TypeName', namespaces['csw'])).text = typename |
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| 122 | self.request = util.xml2string(etree.tostring(node0)) |
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| 123 | |
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| 124 | # invoke |
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| 125 | self.response = util.http_post(self.url, self.request, self.lang) |
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| 126 | |
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| 127 | # parse result |
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| 128 | # TODO: process the XML Schema (you're on your own for now with self.response) |
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| 129 | |
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| 130 | def getdomain(self, dname, dtype='parameter'): |
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| 131 | """ |
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| 132 | |
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| 133 | Construct and process a GetDomain request |
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| 134 | |
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| 135 | Parameters |
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| 136 | ---------- |
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| 137 | |
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| 138 | - dname: the value of the Parameter or Property to query |
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| 139 | - dtype: whether to query a parameter (parameter) or property (property) |
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| 140 | |
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| 141 | """ |
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| 142 | |
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| 143 | # construct request |
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| 144 | dtypename = 'ParameterName' |
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| 145 | node0 = etree.Element(util.nspath('GetDomain', namespaces['csw'])) |
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| 146 | node0.set('service', self.service) |
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| 147 | node0.set('version', self.version) |
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| 148 | node0.set(util.nspath('schemaLocation', namespaces['xsi']), schema_location) |
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| 149 | if dtype == 'property': |
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| 150 | dtypename = 'PropertyName' |
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| 151 | etree.SubElement(node0, util.nspath(dtypename, namespaces['csw'])).text = dname |
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| 152 | self.request = util.xml2string(etree.tostring(node0)) |
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| 153 | |
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| 154 | # invoke |
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| 155 | self.response = util.http_post(self.url, self.request, self.lang) |
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| 156 | |
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| 157 | # parse result |
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| 158 | self._values = etree.parse(StringIO.StringIO(self.response)) |
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| 159 | |
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| 160 | # check for exceptions |
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| 161 | self._isexception(self._values, self.owscommon.namespace) |
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| 162 | |
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| 163 | if self.exceptionreport is None: |
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| 164 | self.results = {} |
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| 165 | |
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| 166 | val = self._values.find(util.nspath('DomainValues', namespaces['csw'])).attrib.get('type') |
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| 167 | self.results['type'] = util.testXMLValue(val, True) |
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| 168 | |
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| 169 | val = self._values.find(util.nspath('DomainValues/' + dtypename, namespaces['csw'])) |
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| 170 | self.results[dtype] = util.testXMLValue(val) |
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| 171 | |
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| 172 | # get the list of values associated with the Domain |
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| 173 | self.results['values'] = [] |
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| 174 | |
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| 175 | for f in self._values.findall(util.nspath('DomainValues/ListOfValues/Value', namespaces['csw'])): |
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| 176 | self.results['values'].append(util.testXMLValue(f)) |
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| 177 | |
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| 178 | def getrecords(self, qtype=None, keywords=[], typenames='csw:Record', propertyname='AnyText', bbox=None, esn='full', sortby=None, schema=namespaces['csw'], format=outputformat, startposition=0, maxrecords=10): |
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| 179 | """ |
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| 180 | |
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| 181 | Construct and process a GetRecords request |
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| 182 | |
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| 183 | Parameters |
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| 184 | ---------- |
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| 185 | |
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| 186 | - qtype: type of resource to query (i.e. service, dataset) |
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| 187 | - keywords: list of keywords |
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| 188 | - typenames: the typeNames to query against (default is csw:Record) |
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| 189 | - propertyname: the PropertyName to Filter against |
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| 190 | - bbox: the bounding box of the spatial query in the form [minx,miny,maxx,maxy] |
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| 191 | - esn: the ElementSetName 'full', 'brief' or 'summary' (default is 'full') |
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| 192 | - sortby: property to sort results on (default is 'dc:title') |
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| 193 | - schema: the outputSchema (default is 'http://www.opengis.net/cat/csw/2.0.2') |
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| 194 | - format: the outputFormat (default is 'application/xml') |
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| 195 | - startposition: requests a slice of the result set, starting at this position (default is 0) |
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| 196 | - maxrecords: the maximum number of records to return. No records are returned if 0 (default is 10) |
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| 197 | |
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| 198 | """ |
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| 199 | |
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| 200 | # construct request |
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| 201 | node0 = etree.Element(util.nspath('GetRecords', namespaces['csw'])) |
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| 202 | node0.set('outputSchema', schema) |
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| 203 | node0.set('outputFormat', format) |
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| 204 | node0.set('version', self.version) |
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| 205 | node0.set('resultType', 'results') |
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| 206 | node0.set('service', self.service) |
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| 207 | if startposition > 0: |
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| 208 | node0.set('startPosition', str(startposition)) |
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| 209 | node0.set('maxRecords', str(maxrecords)) |
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| 210 | node0.set(util.nspath('schemaLocation', namespaces['xsi']), schema_location) |
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| 211 | |
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| 212 | # decipher number of query parameters ( > 1 sets an 'And' Filter |
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| 213 | pcount = 0 |
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| 214 | if qtype is not None: |
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| 215 | pcount += 1 |
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| 216 | if keywords: |
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| 217 | pcount += 1 |
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| 218 | if bbox is not None: |
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| 219 | pcount += 1 |
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| 220 | |
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| 221 | node1 = etree.SubElement(node0, util.nspath('Query', namespaces['csw'])) |
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| 222 | node1.set('typeNames', typenames) |
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| 223 | |
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| 224 | etree.SubElement(node1, util.nspath('ElementSetName', namespaces['csw'])).text = esn |
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| 225 | |
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| 226 | # decipher if the query is for real |
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| 227 | if keywords or bbox is not None or qtype is not None: |
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| 228 | node2 = etree.SubElement(node1, util.nspath('Constraint', namespaces['csw'])) |
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| 229 | node2.set('version', '1.1.0') |
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| 230 | node3 = etree.SubElement(node2, util.nspath('Filter', namespaces['ogc'])) |
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| 231 | node4 = None |
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| 232 | |
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| 233 | # construct a Filter request |
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| 234 | flt = FilterRequest() |
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| 235 | |
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| 236 | if pcount > 1: # Filter should be And-ed |
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| 237 | node4 = etree.SubElement(node3, util.nspath('And', namespaces['ogc'])) |
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| 238 | |
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| 239 | # set the query type if passed |
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| 240 | # TODO: need a smarter way to figure these out |
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| 241 | if qtype is not None: |
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| 242 | if node4 is not None: |
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| 243 | flt.setpropertyisequalto(node4, 'dc:type', qtype) |
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| 244 | else: |
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| 245 | flt.setpropertyisequalto(node3, 'dc:type', qtype) |
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| 246 | |
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| 247 | # set a bbox query if passed |
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| 248 | if bbox is not None: |
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| 249 | if node4 is not None: |
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| 250 | flt.setbbox(node4, bbox) |
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| 251 | else: |
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| 252 | flt.setbbox(node3, bbox) |
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| 253 | |
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| 254 | # set a keyword query if passed |
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| 255 | if len(keywords) > 0: |
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| 256 | if len(keywords) > 1: # loop multiple keywords into an Or |
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| 257 | if node4 is not None: |
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| 258 | node5 = etree.SubElement(node4, util.nspath('Or', namespaces['ogc'])) |
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| 259 | else: |
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| 260 | node5 = etree.SubElement(node3, util.nspath('Or', namespaces['ogc'])) |
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| 261 | |
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| 262 | for i in keywords: |
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| 263 | flt.setpropertyislike(node5, propertyname, '%%%s%%' % i) |
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| 264 | |
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| 265 | else: # one keyword |
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| 266 | if node4 is not None: |
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| 267 | flt.setpropertyislike(node4, propertyname, '%%%s%%' % keywords[0]) |
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| 268 | else: |
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| 269 | flt.setpropertyislike(node3, propertyname, '%%%s%%' % keywords[0]) |
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| 270 | |
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| 271 | # set a sort if passed |
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| 272 | if sortby is not None: |
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| 273 | flt.setsortby(node1, sortby) |
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| 274 | |
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| 275 | self.request = util.xml2string(etree.tostring(node0)) |
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| 276 | |
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| 277 | # invoke |
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| 278 | self.response = util.http_post(self.url, self.request, self.lang) |
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| 279 | |
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| 280 | # parse result |
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| 281 | self._records = etree.parse(StringIO.StringIO(self.response)) |
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| 282 | |
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| 283 | # check for exceptions |
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| 284 | self._isexception(self._capabilities, self.owscommon.namespace) |
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| 285 | |
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| 286 | if self.exceptionreport is None: |
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| 287 | self.results = {} |
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| 288 | |
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| 289 | # process search results attributes |
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| 290 | val = self._records.find(util.nspath('SearchResults', namespaces['csw'])).attrib.get('numberOfRecordsMatched') |
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| 291 | self.results['matches'] = int(util.testXMLValue(val, True)) |
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| 292 | val = self._records.find(util.nspath('SearchResults', namespaces['csw'])).attrib.get('numberOfRecordsReturned') |
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| 293 | self.results['returned'] = int(util.testXMLValue(val, True)) |
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| 294 | val = self._records.find(util.nspath('SearchResults', namespaces['csw'])).attrib.get('nextRecord') |
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| 295 | self.results['nextrecord'] = int(util.testXMLValue(val, True)) |
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| 296 | |
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| 297 | # process list of matching records |
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| 298 | self.records = {} |
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| 299 | |
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| 300 | if schema == 'http://www.isotc211.org/2005/gmd': # iso 19139 |
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| 301 | for f in self._records.findall(util.nspath('SearchResults', namespaces['csw']) + '/' + util.nspath('MD_Metadata', namespaces['gmd'])): |
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| 302 | val = f.find(util.nspath('fileIdentifier', namespaces['gmd']) + '/' + util.nspath('CharacterString', namespaces['gco'])) |
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| 303 | identifier = util.testXMLValue(val) |
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| 304 | self.records[identifier] = MD_Metadata(f) |
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| 305 | else: # process default |
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| 306 | for f in self._records.findall(util.nspath('SearchResults/' + self._setesnel(esn), namespaces['csw'])): |
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| 307 | val = f.find(util.nspath('identifier', namespaces['dc'])) |
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| 308 | identifier = util.testXMLValue(val) |
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| 309 | self.records[identifier] = CswRecord(f) |
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| 310 | |
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| 311 | def getrecordbyid(self, id=[], esn='full', schema=namespaces['csw'], format=outputformat): |
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| 312 | """ |
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| 313 | |
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| 314 | Construct and process a GetRecordById request |
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| 315 | |
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| 316 | Parameters |
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| 317 | ---------- |
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| 318 | |
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| 319 | - id: the list of Ids |
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| 320 | - esn: the ElementSetName 'full', 'brief' or 'summary' (default is 'full') |
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| 321 | - schema: the outputSchema (default is 'http://www.opengis.net/cat/csw/2.0.2') |
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| 322 | - format: the outputFormat (default is 'application/xml') |
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| 323 | |
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| 324 | """ |
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| 325 | |
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| 326 | # construct request |
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| 327 | node0 = etree.Element(util.nspath('GetRecordById', namespaces['csw'])) |
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| 328 | node0.set('outputSchema', schema) |
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| 329 | node0.set('outputFormat', format) |
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| 330 | node0.set('version', self.version) |
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| 331 | node0.set('service', self.service) |
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| 332 | node0.set(util.nspath('schemaLocation', namespaces['xsi']), schema_location) |
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| 333 | for i in id: |
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| 334 | etree.SubElement(node0, util.nspath('Id', namespaces['csw'])).text = i |
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| 335 | etree.SubElement(node0, util.nspath('ElementSetName', namespaces['csw'])).text = esn |
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| 336 | self.request = util.xml2string(etree.tostring(node0)) |
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| 337 | |
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| 338 | # invoke |
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| 339 | self.response = util.http_post(self.url, self.request, self.lang) |
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| 340 | |
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| 341 | # parse result |
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| 342 | self._records = etree.parse(StringIO.StringIO(self.response)) |
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| 343 | |
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| 344 | # check for exceptions |
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| 345 | self._isexception(self._capabilities, self.owscommon.namespace) |
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| 346 | |
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| 347 | if self.exceptionreport is None: |
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| 348 | self.records = {} |
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| 349 | |
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| 350 | # process matching record |
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| 351 | if schema == 'http://www.isotc211.org/2005/gmd': # iso 19139 |
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| 352 | for i in self._records.findall(util.nspath('MD_Metadata', namespaces['gmd'])): |
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| 353 | val = i.find(util.nspath('fileIdentifier', namespaces['gmd']) + '/' + util.nspath('CharacterString', namespaces['gco'])) |
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| 354 | identifier = util.testXMLValue(val) |
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| 355 | self.records[identifier] = MD_Metadata(i) |
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| 356 | else: # process default |
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| 357 | for i in self._records.findall(util.nspath(self._setesnel(esn), namespaces['csw'])): |
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| 358 | val = i.find(util.nspath('identifier', namespaces['dc'])) |
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| 359 | identifier = util.testXMLValue(val) |
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| 360 | self.records[identifier] = CswRecord(i) |
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| 361 | |
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| 362 | def _setesnel(self, esn): |
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| 363 | """ Set the element name to parse depending on the ElementSetName requested """ |
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| 364 | el = 'Record' |
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| 365 | if esn == 'brief': |
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| 366 | el = 'BriefRecord' |
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| 367 | if esn == 'summary': |
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| 368 | el = 'SummaryRecord' |
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| 369 | return el |
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| 370 | |
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| 371 | def _isexception(self, elem, namespace): |
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| 372 | val = elem.find(util.nspath('Exception', namespaces['ows'])) |
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| 373 | if val is not None: |
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| 374 | self.exceptionreport = ExceptionReport(elem, namespace) |
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| 375 | else: |
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| 376 | self.exceptionreport = None |
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| 377 | |
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| 378 | class CswRecord(object): |
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| 379 | """ Process csw:Record, csw:BriefRecord, csw:SummaryRecord """ |
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| 380 | def __init__(self, record): |
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| 381 | val = record.find(util.nspath('identifier', namespaces['dc'])) |
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| 382 | self.identifier = util.testXMLValue(val) |
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| 383 | |
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| 384 | val = record.find(util.nspath('type', namespaces['dc'])) |
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| 385 | self.type = util.testXMLValue(val) |
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| 386 | |
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| 387 | val = record.find(util.nspath('title', namespaces['dc'])) |
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| 388 | self.title = util.testXMLValue(val) |
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| 389 | |
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| 390 | val = record.find(util.nspath('abstract', namespaces['dct'])) |
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| 391 | self.abstract = util.testXMLValue(val) |
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| 392 | |
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| 393 | val = record.find(util.nspath('URI', namespaces['dc'])) |
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| 394 | self.uri = util.testXMLValue(val) |
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| 395 | |
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| 396 | val = record.find(util.nspath('modified', namespaces['dct'])) |
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| 397 | self.modified = util.testXMLValue(val) |
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| 398 | |
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| 399 | val = record.find(util.nspath('creator', namespaces['dc'])) |
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| 400 | self.creator = util.testXMLValue(val) |
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| 401 | |
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| 402 | val = record.find(util.nspath('publisher', namespaces['dc'])) |
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| 403 | self.publisher = util.testXMLValue(val) |
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| 404 | |
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| 405 | val = record.find(util.nspath('contributor', namespaces['dc'])) |
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| 406 | self.contributor = util.testXMLValue(val) |
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| 407 | |
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| 408 | val = record.find(util.nspath('language', namespaces['dc'])) |
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| 409 | self.language = util.testXMLValue(val) |
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| 410 | |
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| 411 | val = record.find(util.nspath('source', namespaces['dc'])) |
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| 412 | self.source = util.testXMLValue(val) |
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| 413 | |
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| 414 | val = record.find(util.nspath('format', namespaces['dc'])) |
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| 415 | self.format = util.testXMLValue(val) |
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| 416 | |
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| 417 | self.subjects = [] |
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| 418 | for i in record.findall(util.nspath('subject', namespaces['dc'])): |
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| 419 | self.subjects.append(util.testXMLValue(i)) |
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| 420 | |
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| 421 | self.rights = [] |
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| 422 | for i in record.findall(util.nspath('rights', namespaces['dc'])): |
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| 423 | self.rights.append(util.testXMLValue(i)) |
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| 424 | |
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| 425 | val = record.find(util.nspath('BoundingBox', namespaces['ows'])) |
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| 426 | if val is not None: |
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| 427 | self.bbox = BoundingBox(val, namespaces['ows']) |
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| 428 | else: |
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| 429 | self.bbox = None |
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