Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/rdflib/plugins/sleepycat.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000 (2021-03-22)
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0
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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1 import logging
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2 from threading import Thread
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3 from os.path import exists, abspath
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4 from os import mkdir
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5 from rdflib.store import Store, VALID_STORE, NO_STORE
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6 from rdflib.term import URIRef
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7 from six import b
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8 from six.moves.urllib.request import pathname2url
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9
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10
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11 def bb(u):
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12 return u.encode('utf-8')
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13
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14
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15 try:
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16 from bsddb import db
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17 has_bsddb = True
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18 except ImportError:
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19 try:
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20 from bsddb3 import db
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21 has_bsddb = True
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22 except ImportError:
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23 has_bsddb = False
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24
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25
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26 if has_bsddb:
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27 # These are passed to bsddb when creating DBs
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28
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29 # passed to db.DBEnv.set_flags
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30 ENVSETFLAGS = db.DB_CDB_ALLDB
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31 # passed to db.DBEnv.open
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32 ENVFLAGS = db.DB_INIT_MPOOL | db.DB_INIT_CDB | db.DB_THREAD
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33 CACHESIZE = 1024 * 1024 * 50
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34
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35 # passed to db.DB.Open()
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36 DBOPENFLAGS = db.DB_THREAD
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37
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38 logger = logging.getLogger(__name__)
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39
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40 __all__ = ['Sleepycat']
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41
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42
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43 class Sleepycat(Store):
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44 context_aware = True
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45 formula_aware = True
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46 transaction_aware = False
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47 graph_aware = True
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48 db_env = None
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49
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50 def __init__(self, configuration=None, identifier=None):
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51 if not has_bsddb:
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52 raise ImportError(
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53 "Unable to import bsddb/bsddb3, store is unusable.")
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54 self.__open = False
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55 self.__identifier = identifier
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56 super(Sleepycat, self).__init__(configuration)
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57 self._loads = self.node_pickler.loads
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58 self._dumps = self.node_pickler.dumps
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59
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60 def __get_identifier(self):
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61 return self.__identifier
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62 identifier = property(__get_identifier)
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63
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64 def _init_db_environment(self, homeDir, create=True):
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65 if not exists(homeDir):
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66 if create is True:
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67 mkdir(homeDir)
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68 # TODO: implement create method and refactor this to it
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69 self.create(homeDir)
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70 else:
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71 return NO_STORE
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72 db_env = db.DBEnv()
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73 db_env.set_cachesize(0, CACHESIZE) # TODO
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74 # db_env.set_lg_max(1024*1024)
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75 db_env.set_flags(ENVSETFLAGS, 1)
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76 db_env.open(homeDir, ENVFLAGS | db.DB_CREATE)
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77 return db_env
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78
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79 def is_open(self):
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80 return self.__open
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81
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82 def open(self, path, create=True):
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83 if not has_bsddb:
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84 return NO_STORE
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85 homeDir = path
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86
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87 if self.__identifier is None:
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88 self.__identifier = URIRef(pathname2url(abspath(homeDir)))
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89
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90 db_env = self._init_db_environment(homeDir, create)
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91 if db_env == NO_STORE:
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92 return NO_STORE
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93 self.db_env = db_env
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94 self.__open = True
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95
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96 dbname = None
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97 dbtype = db.DB_BTREE
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98 # auto-commit ensures that the open-call commits when transactions
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99 # are enabled
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100
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101 dbopenflags = DBOPENFLAGS
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102 if self.transaction_aware is True:
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103 dbopenflags |= db.DB_AUTO_COMMIT
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104
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105 if create:
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106 dbopenflags |= db.DB_CREATE
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107
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108 dbmode = 0o660
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109 dbsetflags = 0
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110
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111 # create and open the DBs
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112 self.__indicies = [None, ] * 3
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113 self.__indicies_info = [None, ] * 3
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114 for i in range(0, 3):
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115 index_name = to_key_func(
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116 i)((b("s"), b("p"), b("o")), b("c")).decode()
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117 index = db.DB(db_env)
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118 index.set_flags(dbsetflags)
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119 index.open(index_name, dbname, dbtype, dbopenflags, dbmode)
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120 self.__indicies[i] = index
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121 self.__indicies_info[i] = (index, to_key_func(i), from_key_func(i))
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122
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123 lookup = {}
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124 for i in range(0, 8):
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125 results = []
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126 for start in range(0, 3):
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127 score = 1
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128 len = 0
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129 for j in range(start, start + 3):
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130 if i & (1 << (j % 3)):
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131 score = score << 1
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132 len += 1
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133 else:
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134 break
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135 tie_break = 2 - start
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136 results.append(((score, tie_break), start, len))
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137
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138 results.sort()
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139 score, start, len = results[-1]
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140
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141 def get_prefix_func(start, end):
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142 def get_prefix(triple, context):
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143 if context is None:
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144 yield ""
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145 else:
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146 yield context
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147 i = start
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148 while i < end:
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149 yield triple[i % 3]
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150 i += 1
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151 yield ""
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152 return get_prefix
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153
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154 lookup[i] = (
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155 self.__indicies[start],
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156 get_prefix_func(start, start + len),
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157 from_key_func(start),
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158 results_from_key_func(start, self._from_string))
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159
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160 self.__lookup_dict = lookup
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161
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162 self.__contexts = db.DB(db_env)
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163 self.__contexts.set_flags(dbsetflags)
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164 self.__contexts.open("contexts", dbname, dbtype, dbopenflags, dbmode)
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165
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166 self.__namespace = db.DB(db_env)
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167 self.__namespace.set_flags(dbsetflags)
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168 self.__namespace.open("namespace", dbname, dbtype, dbopenflags, dbmode)
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169
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170 self.__prefix = db.DB(db_env)
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171 self.__prefix.set_flags(dbsetflags)
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172 self.__prefix.open("prefix", dbname, dbtype, dbopenflags, dbmode)
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173
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174 self.__k2i = db.DB(db_env)
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175 self.__k2i.set_flags(dbsetflags)
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176 self.__k2i.open("k2i", dbname, db.DB_HASH, dbopenflags, dbmode)
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177
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178 self.__i2k = db.DB(db_env)
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179 self.__i2k.set_flags(dbsetflags)
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180 self.__i2k.open("i2k", dbname, db.DB_RECNO, dbopenflags, dbmode)
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181
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182 self.__needs_sync = False
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183 t = Thread(target=self.__sync_run)
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184 t.setDaemon(True)
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185 t.start()
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186 self.__sync_thread = t
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187 return VALID_STORE
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188
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189 def __sync_run(self):
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190 from time import sleep, time
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191 try:
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192 min_seconds, max_seconds = 10, 300
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193 while self.__open:
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194 if self.__needs_sync:
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195 t0 = t1 = time()
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196 self.__needs_sync = False
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197 while self.__open:
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198 sleep(.1)
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199 if self.__needs_sync:
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200 t1 = time()
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201 self.__needs_sync = False
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202 if time() - t1 > min_seconds \
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203 or time() - t0 > max_seconds:
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204 self.__needs_sync = False
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205 logger.debug("sync")
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206 self.sync()
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207 break
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208 else:
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209 sleep(1)
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210 except Exception as e:
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211 logger.exception(e)
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212
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213 def sync(self):
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214 if self.__open:
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215 for i in self.__indicies:
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216 i.sync()
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217 self.__contexts.sync()
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218 self.__namespace.sync()
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219 self.__prefix.sync()
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220 self.__i2k.sync()
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221 self.__k2i.sync()
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222
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223 def close(self, commit_pending_transaction=False):
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224 self.__open = False
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225 self.__sync_thread.join()
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226 for i in self.__indicies:
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227 i.close()
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228 self.__contexts.close()
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229 self.__namespace.close()
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230 self.__prefix.close()
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231 self.__i2k.close()
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232 self.__k2i.close()
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233 self.db_env.close()
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234
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235 def add(self, triple, context, quoted=False, txn=None):
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236 """\
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237 Add a triple to the store of triples.
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238 """
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239 (subject, predicate, object) = triple
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240 assert self.__open, "The Store must be open."
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241 assert context != self, "Can not add triple directly to store"
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242 Store.add(self, (subject, predicate, object), context, quoted)
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243
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244 _to_string = self._to_string
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245
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246 s = _to_string(subject, txn=txn)
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247 p = _to_string(predicate, txn=txn)
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248 o = _to_string(object, txn=txn)
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249 c = _to_string(context, txn=txn)
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250
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251 cspo, cpos, cosp = self.__indicies
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252
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253 value = cspo.get(bb("%s^%s^%s^%s^" % (c, s, p, o)), txn=txn)
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diff changeset
254 if value is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
255 self.__contexts.put(bb(c), "", txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
256
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
257 contexts_value = cspo.get(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
258 bb("%s^%s^%s^%s^" % ("", s, p, o)), txn=txn) or b("")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
259 contexts = set(contexts_value.split(b("^")))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
260 contexts.add(bb(c))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
261 contexts_value = b("^").join(contexts)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
262 assert contexts_value is not None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
263
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
264 cspo.put(bb("%s^%s^%s^%s^" % (c, s, p, o)), "", txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
265 cpos.put(bb("%s^%s^%s^%s^" % (c, p, o, s)), "", txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
266 cosp.put(bb("%s^%s^%s^%s^" % (c, o, s, p)), "", txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
267 if not quoted:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
268 cspo.put(bb(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
269 "%s^%s^%s^%s^" % ("", s, p, o)), contexts_value, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
270 cpos.put(bb(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
271 "%s^%s^%s^%s^" % ("", p, o, s)), contexts_value, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
272 cosp.put(bb(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
273 "%s^%s^%s^%s^" % ("", o, s, p)), contexts_value, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
274
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
275 self.__needs_sync = True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
276
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
277 def __remove(self, spo, c, quoted=False, txn=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
278 s, p, o = spo
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
279 cspo, cpos, cosp = self.__indicies
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
280 contexts_value = cspo.get(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
281 b("^").join([b(""), s, p, o, b("")]), txn=txn) or b("")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
282 contexts = set(contexts_value.split(b("^")))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
283 contexts.discard(c)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
284 contexts_value = b("^").join(contexts)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
285 for i, _to_key, _from_key in self.__indicies_info:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
286 i.delete(_to_key((s, p, o), c), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
287 if not quoted:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
288 if contexts_value:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
289 for i, _to_key, _from_key in self.__indicies_info:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
290 i.put(_to_key((s, p, o), b("")), contexts_value, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
291 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
292 for i, _to_key, _from_key in self.__indicies_info:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
293 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
294 i.delete(_to_key((s, p, o), b("")), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
295 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
296 pass # TODO: is it okay to ignore these?
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
297
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
298 def remove(self, spo, context, txn=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
299 subject, predicate, object = spo
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
300 assert self.__open, "The Store must be open."
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
301 Store.remove(self, (subject, predicate, object), context)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
302 _to_string = self._to_string
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
303
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
304 if context is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
305 if context == self:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
306 context = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
307
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
308 if subject is not None \
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
309 and predicate is not None \
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
310 and object is not None \
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
311 and context is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
312 s = _to_string(subject, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
313 p = _to_string(predicate, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
314 o = _to_string(object, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
315 c = _to_string(context, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
316 value = self.__indicies[0].get(bb("%s^%s^%s^%s^" %
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
317 (c, s, p, o)), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
318 if value is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
319 self.__remove((bb(s), bb(p), bb(o)), bb(c), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
320 self.__needs_sync = True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
321 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
322 cspo, cpos, cosp = self.__indicies
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
323 index, prefix, from_key, results_from_key = self.__lookup(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
324 (subject, predicate, object), context, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
325
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
326 cursor = index.cursor(txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
327 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
328 current = cursor.set_range(prefix)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
329 needs_sync = True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
330 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
331 current = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
332 needs_sync = False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
333 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
334 while current:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
335 key, value = current
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
336 cursor = index.cursor(txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
337 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
338 cursor.set_range(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
339 # Hack to stop 2to3 converting this to next(cursor)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
340 current = getattr(cursor, 'next')()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
341 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
342 current = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
343 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
344 if key.startswith(prefix):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
345 c, s, p, o = from_key(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
346 if context is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
347 contexts_value = index.get(key, txn=txn) or b("")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
348 # remove triple from all non quoted contexts
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
349 contexts = set(contexts_value.split(b("^")))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
350 # and from the conjunctive index
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
351 contexts.add(b(""))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
352 for c in contexts:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
353 for i, _to_key, _ in self.__indicies_info:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
354 i.delete(_to_key((s, p, o), c), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
355 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
356 self.__remove((s, p, o), c, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
357 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
358 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
359
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
360 if context is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
361 if subject is None and predicate is None and object is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
362 # TODO: also if context becomes empty and not just on
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
363 # remove((None, None, None), c)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
364 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
365 self.__contexts.delete(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
366 bb(_to_string(context, txn=txn)), txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
367 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
368 pass
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
369
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
370 self.__needs_sync = needs_sync
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
371
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
372 def triples(self, spo, context=None, txn=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
373 """A generator over all the triples matching """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
374 assert self.__open, "The Store must be open."
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
375
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
376 subject, predicate, object = spo
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parents:
diff changeset
377
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
378 if context is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
379 if context == self:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
380 context = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
381
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
382 # _from_string = self._from_string ## UNUSED
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
383 index, prefix, from_key, results_from_key = self.__lookup(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
384 (subject, predicate, object), context, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
385
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
386 cursor = index.cursor(txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
387 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
388 current = cursor.set_range(prefix)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
389 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
390 current = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
391 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
392 while current:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
393 key, value = current
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
394 cursor = index.cursor(txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
395 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
396 cursor.set_range(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
397 # Cheap hack so 2to3 doesn't convert to next(cursor)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
398 current = getattr(cursor, 'next')()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
399 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
400 current = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
401 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
402 if key and key.startswith(prefix):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
403 contexts_value = index.get(key, txn=txn)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
404 yield results_from_key(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
405 key, subject, predicate, object, contexts_value)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
406 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
407 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
408
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shellac
parents:
diff changeset
409 def __len__(self, context=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
410 assert self.__open, "The Store must be open."
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
411 if context is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
412 if context == self:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
413 context = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
414
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
415 if context is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
416 prefix = b("^")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
417 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
418 prefix = bb("%s^" % self._to_string(context))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
419
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
420 index = self.__indicies[0]
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
421 cursor = index.cursor()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
422 current = cursor.set_range(prefix)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
423 count = 0
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
424 while current:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
425 key, value = current
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
426 if key.startswith(prefix):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
427 count += 1
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
428 # Hack to stop 2to3 converting this to next(cursor)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
429 current = getattr(cursor, 'next')()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
430 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
431 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
432 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
433 return count
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
434
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
435 def bind(self, prefix, namespace):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
436 prefix = prefix.encode("utf-8")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
437 namespace = namespace.encode("utf-8")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
438 bound_prefix = self.__prefix.get(namespace)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
439 if bound_prefix:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
440 self.__namespace.delete(bound_prefix)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
441 self.__prefix[namespace] = prefix
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
442 self.__namespace[prefix] = namespace
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
443
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
444 def namespace(self, prefix):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
445 prefix = prefix.encode("utf-8")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
446 ns = self.__namespace.get(prefix, None)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
447 if ns is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
448 return URIRef(ns.decode('utf-8'))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
449 return None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
450
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
451 def prefix(self, namespace):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
452 namespace = namespace.encode("utf-8")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
453 prefix = self.__prefix.get(namespace, None)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
454 if prefix is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
455 return prefix.decode('utf-8')
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
456 return None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
457
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
458 def namespaces(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
459 cursor = self.__namespace.cursor()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
460 results = []
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
461 current = cursor.first()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
462 while current:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
463 prefix, namespace = current
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
464 results.append((prefix.decode('utf-8'), namespace.decode('utf-8')))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
465 # Hack to stop 2to3 converting this to next(cursor)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
466 current = getattr(cursor, 'next')()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
467 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
468 for prefix, namespace in results:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
469 yield prefix, URIRef(namespace)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
470
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
471 def contexts(self, triple=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
472 _from_string = self._from_string
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
473 _to_string = self._to_string
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
474
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
475 if triple:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
476 s, p, o = triple
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
477 s = _to_string(s)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
478 p = _to_string(p)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
479 o = _to_string(o)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
480 contexts = self.__indicies[0].get(bb(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
481 "%s^%s^%s^%s^" % ("", s, p, o)))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
482 if contexts:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
483 for c in contexts.split(b("^")):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
484 if c:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
485 yield _from_string(c)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
486 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
487 index = self.__contexts
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
488 cursor = index.cursor()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
489 current = cursor.first()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
490 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
491 while current:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
492 key, value = current
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
493 context = _from_string(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
494 yield context
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
495 cursor = index.cursor()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
496 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
497 cursor.set_range(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
498 # Hack to stop 2to3 converting this to next(cursor)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
499 current = getattr(cursor, 'next')()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
500 except db.DBNotFoundError:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
501 current = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
502 cursor.close()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
503
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
504 def add_graph(self, graph):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
505 self.__contexts.put(bb(self._to_string(graph)), "")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
506
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507 def remove_graph(self, graph):
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508 self.remove((None, None, None), graph)
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509
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510 def _from_string(self, i):
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511 k = self.__i2k.get(int(i))
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512 return self._loads(k)
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513
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514 def _to_string(self, term, txn=None):
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515 k = self._dumps(term)
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516 i = self.__k2i.get(k, txn=txn)
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517 if i is None:
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518 # weird behavoir from bsddb not taking a txn as a keyword argument
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519 # for append
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520 if self.transaction_aware:
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521 i = "%s" % self.__i2k.append(k, txn)
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522 else:
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523 i = "%s" % self.__i2k.append(k)
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524
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525 self.__k2i.put(k, i, txn=txn)
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526 else:
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527 i = i.decode()
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528 return i
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529
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530 def __lookup(self, spo, context, txn=None):
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531 subject, predicate, object = spo
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532 _to_string = self._to_string
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533 if context is not None:
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534 context = _to_string(context, txn=txn)
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535 i = 0
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536 if subject is not None:
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537 i += 1
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538 subject = _to_string(subject, txn=txn)
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539 if predicate is not None:
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540 i += 2
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541 predicate = _to_string(predicate, txn=txn)
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542 if object is not None:
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543 i += 4
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544 object = _to_string(object, txn=txn)
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545 index, prefix_func, from_key, results_from_key = self.__lookup_dict[i]
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546 # print (subject, predicate, object), context, prefix_func, index
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547 # #DEBUG
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548 prefix = bb(
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549 "^".join(prefix_func((subject, predicate, object), context)))
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550 return index, prefix, from_key, results_from_key
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551
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552
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553 def to_key_func(i):
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554 def to_key(triple, context):
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555 "Takes a string; returns key"
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556 return b("^").join(
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557 (context,
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558 triple[i % 3],
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559 triple[(i + 1) % 3],
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diff changeset
560 triple[(i + 2) % 3], b(""))) # "" to tac on the trailing ^
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561 return to_key
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562
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563
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564 def from_key_func(i):
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565 def from_key(key):
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566 "Takes a key; returns string"
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567 parts = key.split(b("^"))
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568 return \
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569 parts[0], \
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570 parts[(3 - i + 0) % 3 + 1], \
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571 parts[(3 - i + 1) % 3 + 1], \
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572 parts[(3 - i + 2) % 3 + 1]
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573 return from_key
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574
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575
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576 def results_from_key_func(i, from_string):
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577 def from_key(key, subject, predicate, object, contexts_value):
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578 "Takes a key and subject, predicate, object; returns tuple for yield"
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579 parts = key.split(b("^"))
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580 if subject is None:
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581 # TODO: i & 1: # dis assemble and/or measure to see which is faster
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582 # subject is None or i & 1
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583 s = from_string(parts[(3 - i + 0) % 3 + 1])
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584 else:
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585 s = subject
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586 if predicate is None: # i & 2:
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587 p = from_string(parts[(3 - i + 1) % 3 + 1])
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588 else:
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589 p = predicate
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590 if object is None: # i & 4:
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diff changeset
591 o = from_string(parts[(3 - i + 2) % 3 + 1])
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592 else:
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593 o = object
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diff changeset
594 return (s, p, o), (
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diff changeset
595 from_string(c) for c in contexts_value.split(b("^")) if c)
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596 return from_key
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597
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parents:
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598
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parents:
diff changeset
599 def readable_index(i):
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diff changeset
600 s, p, o = "?" * 3
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diff changeset
601 if i & 1:
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diff changeset
602 s = "s"
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603 if i & 2:
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diff changeset
604 p = "p"
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diff changeset
605 if i & 4:
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606 o = "o"
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parents:
diff changeset
607 return "%s,%s,%s" % (s, p, o)