Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/rdflib/plugins/sparql/update.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 """
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2
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3 Code for carrying out Update Operations
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4
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5 """
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6
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7 from rdflib import Graph, Variable
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8
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9 from rdflib.plugins.sparql.sparql import QueryContext
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10 from rdflib.plugins.sparql.evalutils import _fillTemplate, _join
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11 from rdflib.plugins.sparql.evaluate import evalBGP, evalPart
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12
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13
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14 def _graphOrDefault(ctx, g):
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15 if g == 'DEFAULT':
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16 return ctx.graph
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17 else:
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18 return ctx.dataset.get_context(g)
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19
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20
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21 def _graphAll(ctx, g):
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22 """
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23 return a list of graphs
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24 """
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25 if g == 'DEFAULT':
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26 return [ctx.graph]
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27 elif g == 'NAMED':
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28 return [c for c in ctx.dataset.contexts()
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29 if c.identifier != ctx.graph.identifier]
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30 elif g == 'ALL':
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31 return list(ctx.dataset.contexts())
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32 else:
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33 return [ctx.dataset.get_context(g)]
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34
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35
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36 def evalLoad(ctx, u):
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37 """
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38 http://www.w3.org/TR/sparql11-update/#load
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39 """
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40
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41 if u.graphiri:
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42 ctx.load(u.iri, default=False, publicID=u.graphiri)
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43 else:
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44 ctx.load(u.iri, default=True)
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45
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46
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47 def evalCreate(ctx, u):
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48 """
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49 http://www.w3.org/TR/sparql11-update/#create
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50 """
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51 g = ctx.datset.get_context(u.graphiri)
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52 if len(g) > 0:
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53 raise Exception("Graph %s already exists." % g.identifier)
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54 raise Exception("Create not implemented!")
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55
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56
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57 def evalClear(ctx, u):
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58 """
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59 http://www.w3.org/TR/sparql11-update/#clear
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60 """
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61
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62 for g in _graphAll(ctx, u.graphiri):
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63 g.remove((None, None, None))
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64
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65 def evalDrop(ctx, u):
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66 """
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67 http://www.w3.org/TR/sparql11-update/#drop
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68 """
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69 if ctx.dataset.store.graph_aware:
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70 for g in _graphAll(ctx, u.graphiri):
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71 ctx.dataset.store.remove_graph(g)
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72 else:
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73 evalClear(ctx, u)
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74
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75
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76 def evalInsertData(ctx, u):
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77 """
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78 http://www.w3.org/TR/sparql11-update/#insertData
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79 """
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80 # add triples
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81 g = ctx.graph
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82 g += u.triples
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83
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84 # add quads
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85 # u.quads is a dict of graphURI=>[triples]
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86 for g in u.quads:
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87 cg = ctx.dataset.get_context(g)
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88 cg += u.quads[g]
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89
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90
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91 def evalDeleteData(ctx, u):
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92 """
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93 http://www.w3.org/TR/sparql11-update/#deleteData
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94 """
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95 # remove triples
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96 g = ctx.graph
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97 g -= u.triples
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98
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99 # remove quads
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100 # u.quads is a dict of graphURI=>[triples]
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101 for g in u.quads:
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102 cg = ctx.dataset.get_context(g)
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103 cg -= u.quads[g]
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104
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105
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106 def evalDeleteWhere(ctx, u):
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107 """
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108 http://www.w3.org/TR/sparql11-update/#deleteWhere
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109 """
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110
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111 res = evalBGP(ctx, u.triples)
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112 for g in u.quads:
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113 cg = ctx.dataset.get_context(g)
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114 c = ctx.pushGraph(cg)
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115 res = _join(res, list(evalBGP(c, u.quads[g])))
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116
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117 for c in res:
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118 g = ctx.graph
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119 g -= _fillTemplate(u.triples, c)
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120
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121 for g in u.quads:
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122 cg = ctx.dataset.get_context(c.get(g))
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123 cg -= _fillTemplate(u.quads[g], c)
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124
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125
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126 def evalModify(ctx, u):
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127
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128 originalctx = ctx
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129
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130 # Using replaces the dataset for evaluating the where-clause
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131 if u.using:
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132 otherDefault = False
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133 for d in u.using:
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134 if d.default:
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135
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136 if not otherDefault:
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137 # replace current default graph
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138 dg = Graph()
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139 ctx = ctx.pushGraph(dg)
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140 otherDefault = True
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141
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142 ctx.load(d.default, default=True)
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143
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144 elif d.named:
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145 g = d.named
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146 ctx.load(g, default=False)
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147
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148 # "The WITH clause provides a convenience for when an operation
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149 # primarily refers to a single graph. If a graph name is specified
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150 # in a WITH clause, then - for the purposes of evaluating the
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151 # WHERE clause - this will define an RDF Dataset containing a
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152 # default graph with the specified name, but only in the absence
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153 # of USING or USING NAMED clauses. In the presence of one or more
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154 # graphs referred to in USING clauses and/or USING NAMED clauses,
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155 # the WITH clause will be ignored while evaluating the WHERE
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156 # clause."
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157 if not u.using and u.withClause:
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158 g = ctx.dataset.get_context(u.withClause)
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159 ctx = ctx.pushGraph(g)
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160
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161 res = evalPart(ctx, u.where)
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162
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163 if u.using:
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164 if otherDefault:
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165 ctx = originalctx # restore original default graph
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166 if u.withClause:
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167 g = ctx.dataset.get_context(u.withClause)
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168 ctx = ctx.pushGraph(g)
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169
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170 for c in res:
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171 dg = ctx.graph
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172 if u.delete:
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173 dg -= _fillTemplate(u.delete.triples, c)
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174
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175 for g, q in u.delete.quads.items():
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176 cg = ctx.dataset.get_context(c.get(g))
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177 cg -= _fillTemplate(q, c)
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178
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179 if u.insert:
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180 dg += _fillTemplate(u.insert.triples, c)
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181
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182 for g, q in u.insert.quads.items():
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183 cg = ctx.dataset.get_context(c.get(g))
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184 cg += _fillTemplate(q, c)
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185
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186
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187 def evalAdd(ctx, u):
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188 """
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189
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190 add all triples from src to dst
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191
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192 http://www.w3.org/TR/sparql11-update/#add
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193 """
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194 src, dst = u.graph
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195
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196 srcg = _graphOrDefault(ctx, src)
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197 dstg = _graphOrDefault(ctx, dst)
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198
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199 if srcg.identifier == dstg.identifier:
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200 return
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201
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202 dstg += srcg
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203
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204
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205 def evalMove(ctx, u):
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206 """
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207
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208 remove all triples from dst
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209 add all triples from src to dst
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210 remove all triples from src
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211
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212 http://www.w3.org/TR/sparql11-update/#move
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213 """
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214
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215 src, dst = u.graph
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216
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217 srcg = _graphOrDefault(ctx, src)
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218 dstg = _graphOrDefault(ctx, dst)
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219
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220 if srcg.identifier == dstg.identifier:
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221 return
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222
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223 dstg.remove((None, None, None))
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224
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225 dstg += srcg
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226
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227 if ctx.dataset.store.graph_aware:
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228 ctx.dataset.store.remove_graph(srcg)
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229 else:
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230 srcg.remove((None, None, None))
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231
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232
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233 def evalCopy(ctx, u):
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234 """
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235
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236 remove all triples from dst
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237 add all triples from src to dst
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238
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239 http://www.w3.org/TR/sparql11-update/#copy
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240 """
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241
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242 src, dst = u.graph
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243
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244 srcg = _graphOrDefault(ctx, src)
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245 dstg = _graphOrDefault(ctx, dst)
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246
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247 if srcg.identifier == dstg.identifier:
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248 return
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249
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250 dstg.remove((None, None, None))
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251
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252 dstg += srcg
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253
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254
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255 def evalUpdate(graph, update, initBindings={}):
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256 """
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257
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258 http://www.w3.org/TR/sparql11-update/#updateLanguage
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259
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260 'A request is a sequence of operations [...] Implementations MUST
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261 ensure that operations of a single request are executed in a
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262 fashion that guarantees the same effects as executing them in
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263 lexical order.
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264
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265 Operations all result either in success or failure.
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266
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267 If multiple operations are present in a single request, then a
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268 result of failure from any operation MUST abort the sequence of
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269 operations, causing the subsequent operations to be ignored.'
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270
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271 This will return None on success and raise Exceptions on error
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272
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273 """
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274
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275 for u in update:
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276
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277 initBindings = dict( ( Variable(k),v ) for k,v in initBindings.items() )
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278
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279 ctx = QueryContext(graph, initBindings=initBindings)
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280 ctx.prologue = u.prologue
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281
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282
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283 try:
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284 if u.name == 'Load':
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285 evalLoad(ctx, u)
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286 elif u.name == 'Clear':
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287 evalClear(ctx, u)
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288 elif u.name == 'Drop':
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289 evalDrop(ctx, u)
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290 elif u.name == 'Create':
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291 evalCreate(ctx, u)
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292 elif u.name == 'Add':
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293 evalAdd(ctx, u)
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294 elif u.name == 'Move':
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295 evalMove(ctx, u)
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296 elif u.name == 'Copy':
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297 evalCopy(ctx, u)
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298 elif u.name == 'InsertData':
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299 evalInsertData(ctx, u)
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300 elif u.name == 'DeleteData':
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301 evalDeleteData(ctx, u)
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302 elif u.name == 'DeleteWhere':
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303 evalDeleteWhere(ctx, u)
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304 elif u.name == 'Modify':
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305 evalModify(ctx, u)
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306 else:
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307 raise Exception('Unknown update operation: %s' % (u,))
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308 except:
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309 if not u.silent:
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310 raise