Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/query.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1
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2 import os
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3 import shutil
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4 import tempfile
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5 import warnings
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6 import types
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7
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8 from urllib.parse import urlparse
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9 try:
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10 from io import BytesIO
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11 assert BytesIO
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12 except:
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13 from io import StringIO as BytesIO
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14
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15 from . import py3compat
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16
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17 __all__ = ['Processor', 'Result', 'ResultParser', 'ResultSerializer',
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18 'ResultException']
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22
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23 class Processor(object):
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24 """
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25 Query plugin interface.
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26
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27 This module is useful for those wanting to write a query processor
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28 that can plugin to rdf. If you are wanting to execute a query you
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29 likely want to do so through the Graph class query method.
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30
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31 """
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32
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33 def __init__(self, graph):
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34 pass
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35
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36 def query(self, strOrQuery, initBindings={}, initNs={}, DEBUG=False):
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37 pass
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38
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39 class UpdateProcessor(object):
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40 """
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41 Update plugin interface.
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42
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43 This module is useful for those wanting to write an update
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44 processor that can plugin to rdflib. If you are wanting to execute
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45 an update statement you likely want to do so through the Graph
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46 class update method.
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47
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48 .. versionadded:: 4.0
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49
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50 """
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51
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52 def __init__(self, graph):
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53 pass
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54 def update(self, strOrQuery, initBindings={}, initNs={}):
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55 pass
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56
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57 class ResultException(Exception):
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58 pass
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59
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60
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61 class EncodeOnlyUnicode(object):
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62 """
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63 This is a crappy work-around for
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64 http://bugs.python.org/issue11649
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65
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66
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67 """
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68
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69 def __init__(self, stream):
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70 self.__stream = stream
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71
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72 def write(self, arg):
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73 if isinstance(arg, str):
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74 self.__stream.write(arg.encode("utf-8"))
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75 else:
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76 self.__stream.write(arg)
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77
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78 def __getattr__(self, name):
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79 return getattr(self.__stream, name)
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80
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81
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82 class ResultRow(tuple):
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83 """
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84 a single result row
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85 allows accessing bindings as attributes or with []
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86
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87 >>> from rdflib import URIRef, Variable
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88 >>> rr=ResultRow({ Variable('a'): URIRef('urn:cake') }, [Variable('a')])
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89
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90 >>> rr[0]
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91 rdflib.term.URIRef(%(u)s'urn:cake')
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92 >>> rr[1]
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93 Traceback (most recent call last):
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94 ...
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95 IndexError: tuple index out of range
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96
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97 >>> rr.a
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98 rdflib.term.URIRef(%(u)s'urn:cake')
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99 >>> rr.b
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100 Traceback (most recent call last):
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101 ...
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102 AttributeError: b
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103
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104 >>> rr['a']
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105 rdflib.term.URIRef(%(u)s'urn:cake')
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106 >>> rr['b']
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107 Traceback (most recent call last):
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108 ...
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109 KeyError: 'b'
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110
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111 >>> rr[Variable('a')]
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112 rdflib.term.URIRef(%(u)s'urn:cake')
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113
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114 .. versionadded:: 4.0
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115
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116 """
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117 __doc__ = py3compat.format_doctest_out(__doc__)
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118
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119 def __new__(cls, values, labels):
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120
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121 instance = super(ResultRow, cls).__new__(
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122 cls, (values.get(v) for v in labels))
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123 instance.labels = dict((str(x[1]), x[0])
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124 for x in enumerate(labels))
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125 return instance
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126
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127 def __getattr__(self, name):
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128 if name not in self.labels:
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129 raise AttributeError(name)
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130 return tuple.__getitem__(self, self.labels[name])
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131
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132 def __getitem__(self, name):
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133 try:
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134 return tuple.__getitem__(self, name)
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135 except TypeError:
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136 if name in self.labels:
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137 return tuple.__getitem__(self, self.labels[name])
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138 if str(name) in self.labels: # passing in variable object
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139 return tuple.__getitem__(self, self.labels[str(name)])
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140 raise KeyError(name)
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141
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142 def asdict(self):
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143 return dict((v, self[v]) for v in self.labels if self[v] != None)
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144
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145
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146 class Result(object):
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147 """
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148 A common class for representing query result.
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149
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150 There is a bit of magic here that makes this appear like different
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151 Python objects, depending on the type of result.
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152
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153 If the type is "SELECT", iterating will yield lists of QueryRow objects
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154
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155 If the type is "ASK", iterating will yield a single bool (or
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156 bool(result) will return the same bool)
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157
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158 If the type is "CONSTRUCT" or "DESCRIBE" iterating will yield the
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159 triples.
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160
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161 len(result) also works.
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162
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163 """
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164 def __init__(self, type_):
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165
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166 if type_ not in ('CONSTRUCT', 'DESCRIBE', 'SELECT', 'ASK'):
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167 raise ResultException('Unknown Result type: %s' % type_)
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168
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169 self.type = type_
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170 self.vars = None
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171 self._bindings = None
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172 self._genbindings = None
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173 self.askAnswer = None
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174 self.graph = None
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175
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176 def _get_bindings(self):
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177 if self._genbindings:
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178 self._bindings += list(self._genbindings)
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179 self._genbindings = None
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180
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181 return self._bindings
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182
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183 def _set_bindings(self, b):
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184 if isinstance(b, types.GeneratorType):
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185 self._genbindings = b
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186 self._bindings = []
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187 else:
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188 self._bindings = b
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189
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190 bindings = property(
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191 _get_bindings, _set_bindings, doc="a list of variable bindings as dicts")
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192
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193 @staticmethod
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194 def parse(source, format='xml', **kwargs):
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195 from rdflib import plugin
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196 parser = plugin.get(format, ResultParser)()
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197 return parser.parse(source, **kwargs)
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198
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199 def serialize(
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200 self, destination=None, encoding="utf-8", format='xml', **args):
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201
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202 if self.type in ('CONSTRUCT', 'DESCRIBE'):
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203 return self.graph.serialize(
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204 destination, encoding=encoding, format=format, **args)
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205
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206 """stolen wholesale from graph.serialize"""
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207 from rdflib import plugin
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208 serializer = plugin.get(format, ResultSerializer)(self)
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209 if destination is None:
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210 stream = BytesIO()
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211 stream2 = EncodeOnlyUnicode(stream)
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212 serializer.serialize(stream2, encoding=encoding, **args)
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213 return stream.getvalue()
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214 if hasattr(destination, "write"):
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215 stream = destination
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216 serializer.serialize(stream, encoding=encoding, **args)
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217 else:
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218 location = destination
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219 scheme, netloc, path, params, query, fragment = urlparse(location)
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220 if netloc != "":
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221 print(("WARNING: not saving as location" +
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222 "is not a local file reference"))
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223 return
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224 fd, name = tempfile.mkstemp()
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225 stream = os.fdopen(fd, 'wb')
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226 serializer.serialize(stream, encoding=encoding, **args)
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227 stream.close()
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228 if hasattr(shutil, "move"):
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229 shutil.move(name, path)
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230 else:
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231 shutil.copy(name, path)
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232 os.remove(name)
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233
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234 def __len__(self):
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235 if self.type == 'ASK':
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236 return 1
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237 elif self.type == 'SELECT':
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238 return len(self.bindings)
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239 else:
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240 return len(self.graph)
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241
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242 def __bool__(self):
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243 if self.type == 'ASK':
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244 return self.askAnswer
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245 else:
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246 return len(self)>0
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247
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248 def __iter__(self):
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249 if self.type in ("CONSTRUCT", "DESCRIBE"):
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250 for t in self.graph:
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251 yield t
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252 elif self.type == 'ASK':
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253 yield self.askAnswer
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254 elif self.type == 'SELECT':
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255 # this iterates over ResultRows of variable bindings
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256
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257 if self._genbindings:
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258 for b in self._genbindings:
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259 if b: # don't add a result row in case of empty binding {}
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260 self._bindings.append(b)
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261 yield ResultRow(b, self.vars)
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262 self._genbindings = None
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263 else:
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264 for b in self._bindings:
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265 if b: # don't add a result row in case of empty binding {}
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266 yield ResultRow(b, self.vars)
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267
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268 def __getattr__(self, name):
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269 if self.type in ("CONSTRUCT", "DESCRIBE") and self.graph is not None:
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270 return self.graph.__getattr__(self, name)
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271 elif self.type == 'SELECT' and name == 'result':
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272 warnings.warn(
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273 "accessing the 'result' attribute is deprecated."
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274 " Iterate over the object instead.",
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275 DeprecationWarning, stacklevel=2)
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276 # copied from __iter__, above
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277 return [(tuple(b[v] for v in self.vars)) for b in self.bindings]
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278 else:
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279 raise AttributeError(
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280 "'%s' object has no attribute '%s'" % (self, name))
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281
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282 def __eq__(self, other):
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283 try:
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284 if self.type != other.type:
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285 return False
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286 if self.type == 'ASK':
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287 return self.askAnswer == other.askAnswer
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288 elif self.type == 'SELECT':
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289 return self.vars == other.vars \
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290 and self.bindings == other.bindings
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291 else:
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292 return self.graph == other.graph
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293
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294 except:
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295 return False
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296
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297
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298 class ResultParser(object):
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299
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300 def __init__(self):
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301 pass
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302
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303 def parse(self, source, **kwargs):
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304 """return a Result object"""
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305 pass # abstract
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306
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307
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308 class ResultSerializer(object):
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309
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310 def __init__(self, result):
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311 self.result = result
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312
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313 def serialize(self, stream, encoding="utf-8", **kwargs):
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314 """return a string properly serialized"""
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315 pass # abstract