nodes.py 26 KB

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  1. #!/usr/bin/env python
  2. # -*- coding: utf-8 -*-
  3. ###
  4. ### Author: Chris Iatrou (ichrispa@core-vector.net)
  5. ### Version: rev 13
  6. ###
  7. ### This program was created for educational purposes and has been
  8. ### contributed to the open62541 project by the author. All licensing
  9. ### terms for this source is inherited by the terms and conditions
  10. ### specified for by the open62541 project (see the projects readme
  11. ### file for more information on the LGPL terms and restrictions).
  12. ###
  13. ### This program is not meant to be used in a production environment. The
  14. ### author is not liable for any complications arising due to the use of
  15. ### this program.
  16. ###
  17. import sys
  18. import logging
  19. from datatypes import *
  20. __all__ = ['Reference', 'RefOrAlias', 'Node', 'ReferenceTypeNode',
  21. 'ObjectNode', 'VariableNode', 'VariableTypeNode',
  22. 'MethodNode', 'ObjectTypeNode', 'DataTypeNode', 'ViewNode']
  23. logger = logging.getLogger(__name__)
  24. if sys.version_info[0] >= 3:
  25. # strings are already parsed to unicode
  26. def unicode(s):
  27. return s
  28. class Reference(object):
  29. # all either nodeids or strings with an alias
  30. def __init__(self, source, referenceType, target, isForward):
  31. self.source = source
  32. self.referenceType = referenceType
  33. self.target = target
  34. self.isForward = isForward
  35. def __str__(self):
  36. retval = str(self.source)
  37. if not self.isForward:
  38. retval = retval + "<"
  39. retval = retval + "--[" + str(self.referenceType) + "]--"
  40. if self.isForward:
  41. retval = retval + ">"
  42. return retval + str(self.target)
  43. def __repr__(self):
  44. return str(self)
  45. def __eq__(self, other):
  46. return str(self) == str(other)
  47. def __ne__(self, other):
  48. return not self.__eq__(other)
  49. def __hash__(self):
  50. return hash(str(self))
  51. def RefOrAlias(s):
  52. try:
  53. return NodeId(s)
  54. except Exception:
  55. return s
  56. class Node(object):
  57. def __init__(self):
  58. self.id = NodeId()
  59. self.browseName = QualifiedName()
  60. self.displayName = LocalizedText()
  61. self.description = LocalizedText()
  62. self.symbolicName = String()
  63. self.writeMask = 0
  64. self.userWriteMask = 0
  65. self.references = set()
  66. self.hidden = False
  67. self.modelUri = None
  68. def __str__(self):
  69. return self.__class__.__name__ + "(" + str(self.id) + ")"
  70. def __repr__(self):
  71. return str(self)
  72. def sanitize(self):
  73. pass
  74. def parseXML(self, xmlelement):
  75. for idname in ['NodeId', 'NodeID', 'nodeid']:
  76. if xmlelement.hasAttribute(idname):
  77. self.id = RefOrAlias(xmlelement.getAttribute(idname))
  78. for (at, av) in xmlelement.attributes.items():
  79. if at == "BrowseName":
  80. self.browseName = QualifiedName(av)
  81. elif at == "DisplayName":
  82. self.displayName = LocalizedText(av)
  83. elif at == "Description":
  84. self.description = LocalizedText(av)
  85. elif at == "WriteMask":
  86. self.writeMask = int(av)
  87. elif at == "UserWriteMask":
  88. self.userWriteMask = int(av)
  89. elif at == "EventNotifier":
  90. self.eventNotifier = int(av)
  91. elif at == "SymbolicName":
  92. self.symbolicName = String(av)
  93. for x in xmlelement.childNodes:
  94. if x.nodeType != x.ELEMENT_NODE:
  95. continue
  96. if x.firstChild:
  97. if x.localName == "BrowseName":
  98. self.browseName = QualifiedName(x.firstChild.data)
  99. elif x.localName == "DisplayName":
  100. self.displayName = LocalizedText(x.firstChild.data)
  101. elif x.localName == "Description":
  102. self.description = LocalizedText(x.firstChild.data)
  103. elif x.localName == "WriteMask":
  104. self.writeMask = int(unicode(x.firstChild.data))
  105. elif x.localName == "UserWriteMask":
  106. self.userWriteMask = int(unicode(x.firstChild.data))
  107. if x.localName == "References":
  108. self.parseXMLReferences(x)
  109. def parseXMLReferences(self, xmlelement):
  110. for ref in xmlelement.childNodes:
  111. if ref.nodeType != ref.ELEMENT_NODE:
  112. continue
  113. source = RefOrAlias(str(self.id)) # deep-copy of the nodeid
  114. target = RefOrAlias(ref.firstChild.data)
  115. reftype = None
  116. forward = True
  117. for (at, av) in ref.attributes.items():
  118. if at == "ReferenceType":
  119. reftype = RefOrAlias(av)
  120. elif at == "IsForward":
  121. forward = not "false" in av.lower()
  122. self.references.add(Reference(source, reftype, target, forward))
  123. def popParentRef(self, parentreftypes):
  124. # HasSubtype has precedence
  125. for ref in self.references:
  126. if ref.referenceType == NodeId("ns=0;i=45") and not ref.isForward:
  127. self.references.remove(ref)
  128. return ref
  129. for ref in self.references:
  130. if ref.referenceType in parentreftypes and not ref.isForward:
  131. self.references.remove(ref)
  132. return ref
  133. return Reference(NodeId(), NodeId(), NodeId(), False)
  134. def popTypeDef(self):
  135. for ref in self.references:
  136. if ref.referenceType.i == 40 and ref.isForward:
  137. self.references.remove(ref)
  138. return ref
  139. return Reference(NodeId(), NodeId(), NodeId(), False)
  140. def replaceAliases(self, aliases):
  141. if str(self.id) in aliases:
  142. self.id = NodeId(aliases[self.id])
  143. if isinstance(self, VariableNode) or isinstance(self, VariableTypeNode):
  144. if str(self.dataType) in aliases:
  145. self.dataType = NodeId(aliases[self.dataType])
  146. new_refs = set()
  147. for ref in self.references:
  148. if str(ref.source) in aliases:
  149. ref.source = NodeId(aliases[ref.source])
  150. if str(ref.target) in aliases:
  151. ref.target = NodeId(aliases[ref.target])
  152. if str(ref.referenceType) in aliases:
  153. ref.referenceType = NodeId(aliases[ref.referenceType])
  154. new_refs.add(ref)
  155. self.references = new_refs
  156. def replaceNamespaces(self, nsMapping):
  157. self.id.ns = nsMapping[self.id.ns]
  158. self.browseName.ns = nsMapping[self.browseName.ns]
  159. if hasattr(self, 'dataType') and isinstance(self.dataType, NodeId):
  160. self.dataType.ns = nsMapping[self.dataType.ns]
  161. new_refs = set()
  162. for ref in self.references:
  163. ref.source.ns = nsMapping[ref.source.ns]
  164. ref.target.ns = nsMapping[ref.target.ns]
  165. ref.referenceType.ns = nsMapping[ref.referenceType.ns]
  166. new_refs.add(ref)
  167. self.references = new_refs
  168. class ReferenceTypeNode(Node):
  169. def __init__(self, xmlelement=None):
  170. Node.__init__(self)
  171. self.isAbstract = False
  172. self.symmetric = False
  173. self.inverseName = ""
  174. if xmlelement:
  175. ReferenceTypeNode.parseXML(self, xmlelement)
  176. def parseXML(self, xmlelement):
  177. Node.parseXML(self, xmlelement)
  178. for (at, av) in xmlelement.attributes.items():
  179. if at == "Symmetric":
  180. self.symmetric = "false" not in av.lower()
  181. elif at == "InverseName":
  182. self.inverseName = str(av)
  183. elif at == "IsAbstract":
  184. self.isAbstract = "false" not in av.lower()
  185. for x in xmlelement.childNodes:
  186. if x.nodeType == x.ELEMENT_NODE:
  187. if x.localName == "InverseName" and x.firstChild:
  188. self.inverseName = str(unicode(x.firstChild.data))
  189. class ObjectNode(Node):
  190. def __init__(self, xmlelement=None):
  191. Node.__init__(self)
  192. self.eventNotifier = 0
  193. if xmlelement:
  194. ObjectNode.parseXML(self, xmlelement)
  195. def parseXML(self, xmlelement):
  196. Node.parseXML(self, xmlelement)
  197. for (at, av) in xmlelement.attributes.items():
  198. if at == "EventNotifier":
  199. self.eventNotifier = int(av)
  200. class VariableNode(Node):
  201. def __init__(self, xmlelement=None):
  202. Node.__init__(self)
  203. self.dataType = NodeId()
  204. self.valueRank = -2
  205. self.arrayDimensions = []
  206. # Set access levels to read by default
  207. self.accessLevel = 1
  208. self.userAccessLevel = 1
  209. self.minimumSamplingInterval = 0.0
  210. self.historizing = False
  211. self.value = None
  212. self.xmlValueDef = None
  213. if xmlelement:
  214. VariableNode.parseXML(self, xmlelement)
  215. def parseXML(self, xmlelement):
  216. Node.parseXML(self, xmlelement)
  217. for (at, av) in xmlelement.attributes.items():
  218. if at == "ValueRank":
  219. self.valueRank = int(av)
  220. elif at == "AccessLevel":
  221. self.accessLevel = int(av)
  222. elif at == "UserAccessLevel":
  223. self.userAccessLevel = int(av)
  224. elif at == "MinimumSamplingInterval":
  225. self.minimumSamplingInterval = float(av)
  226. elif at == "DataType":
  227. self.dataType = RefOrAlias(av)
  228. elif at == "ArrayDimensions":
  229. self.arrayDimensions = av.split(",")
  230. for x in xmlelement.childNodes:
  231. if x.nodeType != x.ELEMENT_NODE:
  232. continue
  233. if x.localName == "Value":
  234. self.xmlValueDef = x
  235. elif x.localName == "DataType":
  236. self.dataType = RefOrAlias(av)
  237. elif x.localName == "ValueRank":
  238. self.valueRank = int(unicode(x.firstChild.data))
  239. elif x.localName == "ArrayDimensions" and len(self.arrayDimensions) == 0:
  240. elements = x.getElementsByTagName("ListOfUInt32");
  241. if len(elements):
  242. for idx, v in enumerate(elements[0].getElementsByTagName("UInt32")):
  243. self.arrayDimensions.append(v.firstChild.data)
  244. elif x.localName == "AccessLevel":
  245. self.accessLevel = int(unicode(x.firstChild.data))
  246. elif x.localName == "UserAccessLevel":
  247. self.userAccessLevel = int(unicode(x.firstChild.data))
  248. elif x.localName == "MinimumSamplingInterval":
  249. self.minimumSamplingInterval = float(unicode(x.firstChild.data))
  250. elif x.localName == "Historizing":
  251. self.historizing = "false" not in x.lower()
  252. def allocateValue(self, nodeset):
  253. dataTypeNode = nodeset.getDataTypeNode(self.dataType)
  254. if dataTypeNode is None:
  255. return False
  256. # FIXME: Don't build at all or allocate "defaults"? I'm for not building at all.
  257. if self.xmlValueDef is None:
  258. #logger.warn("Variable " + self.browseName() + "/" + str(self.id()) + " is not initialized. No memory will be allocated.")
  259. return False
  260. self.value = Value()
  261. self.value.parseXMLEncoding(self.xmlValueDef, dataTypeNode, self, nodeset.namespaceMapping[self.modelUri])
  262. # Array Dimensions must accurately represent the value and will be patched
  263. # reflect the exaxt dimensions attached binary stream.
  264. if not isinstance(self.value, Value) or len(self.value.value) == 0:
  265. self.arrayDimensions = []
  266. return True
  267. class VariableTypeNode(VariableNode):
  268. def __init__(self, xmlelement=None):
  269. VariableNode.__init__(self)
  270. self.isAbstract = False
  271. if xmlelement:
  272. VariableTypeNode.parseXML(self, xmlelement)
  273. def parseXML(self, xmlelement):
  274. Node.parseXML(self, xmlelement)
  275. for (at, av) in xmlelement.attributes.items():
  276. if at == "IsAbstract":
  277. self.isAbstract = "false" not in av.lower()
  278. class MethodNode(Node):
  279. def __init__(self, xmlelement=None):
  280. Node.__init__(self)
  281. self.executable = True
  282. self.userExecutable = True
  283. self.methodDecalaration = None
  284. if xmlelement:
  285. MethodNode.parseXML(self, xmlelement)
  286. def parseXML(self, xmlelement):
  287. Node.parseXML(self, xmlelement)
  288. for (at, av) in xmlelement.attributes.items():
  289. if at == "Executable":
  290. self.executable = "false" not in av.lower()
  291. if at == "UserExecutable":
  292. self.userExecutable = "false" not in av.lower()
  293. if at == "MethodDeclarationId":
  294. self.methodDeclaration = str(av)
  295. class ObjectTypeNode(Node):
  296. def __init__(self, xmlelement=None):
  297. Node.__init__(self)
  298. self.isAbstract = False
  299. if xmlelement:
  300. ObjectTypeNode.parseXML(self, xmlelement)
  301. def parseXML(self, xmlelement):
  302. Node.parseXML(self, xmlelement)
  303. for (at, av) in xmlelement.attributes.items():
  304. if at == "IsAbstract":
  305. self.isAbstract = "false" not in av.lower()
  306. class DataTypeNode(Node):
  307. """ DataTypeNode is a subtype of Node describing DataType nodes.
  308. DataType contain definitions and structure information usable for Variables.
  309. The format of this structure is determined by buildEncoding()
  310. Two definition styles are distinguished in XML:
  311. 1) A DataType can be a structure of fields, each field having a name and a type.
  312. The type must be either an encodable builtin node (ex. UInt32) or point to
  313. another DataType node that inherits its encoding from a builtin type using
  314. a inverse "hasSubtype" (hasSuperType) reference.
  315. 2) A DataType may be an enumeration, in which each field has a name and a numeric
  316. value.
  317. The definition is stored as an ordered list of tuples. Depending on which
  318. definition style was used, the __definition__ will hold
  319. 1) A list of ("Fieldname", Node) tuples.
  320. 2) A list of ("Fieldname", int) tuples.
  321. A DataType (and in consequence all Variables using it) shall be deemed not
  322. encodable if any of its fields cannot be traced to an encodable builtin type.
  323. A DataType shall be further deemed not encodable if it contains mixed structure/
  324. enumaration definitions.
  325. If encodable, the encoding can be retrieved using getEncoding().
  326. """
  327. __isEnum__ = False
  328. __xmlDefinition__ = None
  329. __baseTypeEncoding__ = []
  330. __encodable__ = False
  331. __encodingBuilt__ = False
  332. __definition__ = []
  333. def __init__(self, xmlelement=None):
  334. Node.__init__(self)
  335. self.isAbstract = False
  336. self.__xmlDefinition__ = None
  337. self.__baseTypeEncoding__ = []
  338. self.__encodable__ = None
  339. self.__encodingBuilt__ = False
  340. self.__definition__ = []
  341. self.__isEnum__ = False
  342. self.__isOptionSet__ = False
  343. if xmlelement:
  344. DataTypeNode.parseXML(self, xmlelement)
  345. def parseXML(self, xmlelement):
  346. Node.parseXML(self, xmlelement)
  347. for (at, av) in xmlelement.attributes.items():
  348. if at == "IsAbstract":
  349. self.isAbstract = "false" not in av.lower()
  350. for x in xmlelement.childNodes:
  351. if x.nodeType == x.ELEMENT_NODE:
  352. if x.localName == "Definition":
  353. self.__xmlDefinition__ = x
  354. def isEncodable(self):
  355. """ Will return True if buildEncoding() was able to determine which builtin
  356. type corresponds to all fields of this DataType.
  357. If no encoding has been build yet, this function will call buildEncoding()
  358. and return True if it succeeds.
  359. """
  360. return self.__encodable__
  361. def getEncoding(self):
  362. """ If the dataType is encodable, getEncoding() returns a nested list
  363. containing the encoding the structure definition for this type.
  364. If no encoding has been build yet, this function will call buildEncoding()
  365. and return the encoding if buildEncoding() succeeds.
  366. If buildEncoding() fails or has failed, an empty list will be returned.
  367. """
  368. if self.__encodable__ == False:
  369. if self.__encodingBuilt__ == False:
  370. return self.buildEncoding()
  371. return []
  372. else:
  373. return self.__baseTypeEncoding__
  374. def buildEncoding(self, nodeset, indent=0, force=False):
  375. """ buildEncoding() determines the structure and aliases used for variables
  376. of this DataType.
  377. The function will parse the XML <Definition> of the dataType and extract
  378. "Name"-"Type" tuples. If successful, buildEncoding will return a nested
  379. list of the following format:
  380. [['Alias1', ['Alias2', ['BuiltinType']]], [Alias2, ['BuiltinType']], ...]
  381. Aliases are fieldnames defined by this DataType or DataTypes referenced. A
  382. list such as ['DataPoint', ['Int32']] indicates that a value will encode
  383. an Int32 with the alias 'DataPoint' such as <DataPoint>12827</DataPoint>.
  384. Only the first Alias of a nested list is considered valid for the BuiltinType.
  385. Single-Elemented lists are always BuiltinTypes. Every nested list must
  386. converge in a builtin type to be encodable. buildEncoding will follow
  387. the first type inheritance reference (hasSupertype) of the dataType if
  388. necessary;
  389. If instead to "DataType" a numeric "Value" attribute is encountered,
  390. the DataType will be considered an enumeration and all Variables using
  391. it will be encoded as Int32.
  392. DataTypes can be either structures or enumeration - mixed definitions will
  393. be unencodable.
  394. Calls to getEncoding() will be iterative. buildEncoding() can be called
  395. only once per dataType, with all following calls returning the predetermined
  396. value. Use of the 'force=True' parameter will force the Definition to be
  397. reparsed.
  398. After parsing, __definition__ holds the field definition as a list. Note
  399. that this might deviate from the encoding, especially if inheritance was
  400. used.
  401. """
  402. prefix = " " + "|"*indent+ "+"
  403. if force==True:
  404. self.__encodingBuilt__ = False
  405. if self.__encodingBuilt__ == True:
  406. if self.isEncodable():
  407. logger.debug(prefix + str(self.__baseTypeEncoding__) + " (already analyzed)")
  408. else:
  409. logger.debug( prefix + str(self.__baseTypeEncoding__) + "(already analyzed, not encodable!)")
  410. return self.__baseTypeEncoding__
  411. self.__encodingBuilt__ = True # signify that we have attempted to built this type
  412. self.__encodable__ = True
  413. if indent==0:
  414. logger.debug("Parsing DataType " + str(self.browseName) + " (" + str(self.id) + ")")
  415. if valueIsInternalType(self.browseName.name):
  416. self.__baseTypeEncoding__ = [self.browseName.name]
  417. self.__encodable__ = True
  418. logger.debug( prefix + str(self.browseName) + "*")
  419. logger.debug("Encodable as: " + str(self.__baseTypeEncoding__))
  420. logger.debug("")
  421. return self.__baseTypeEncoding__
  422. # Check if there is a supertype available
  423. parentType = None
  424. for ref in self.references:
  425. if ref.isForward:
  426. continue
  427. # hasSubtype
  428. if ref.referenceType.i == 45:
  429. targetNode = nodeset.nodes[ref.target]
  430. if targetNode is not None and isinstance(targetNode, DataTypeNode):
  431. parentType = targetNode
  432. break
  433. if self.__xmlDefinition__ is None:
  434. if parentType is not None:
  435. logger.debug( prefix + "Attempting definition using supertype " + str(targetNode.browseName) + " for DataType " + " " + str(self.browseName))
  436. subenc = targetNode.buildEncoding(nodeset=nodeset, indent=indent+1)
  437. if not targetNode.isEncodable():
  438. self.__encodable__ = False
  439. else:
  440. self.__baseTypeEncoding__ = self.__baseTypeEncoding__ + [self.browseName.name, subenc, None]
  441. if len(self.__baseTypeEncoding__) == 0:
  442. logger.debug(prefix + "No viable definition for " + str(self.browseName) + " " + str(self.id) + " found.")
  443. self.__encodable__ = False
  444. if indent==0:
  445. if not self.__encodable__:
  446. logger.debug("Not encodable (partial): " + str(self.__baseTypeEncoding__))
  447. else:
  448. logger.debug("Encodable as: " + str(self.__baseTypeEncoding__))
  449. logger.debug( "")
  450. return self.__baseTypeEncoding__
  451. isEnum = True
  452. isSubType = True
  453. isOptionSet = parentType is not None and parentType.id.ns == 0 and parentType.id.i==12755
  454. # We need to store the definition as ordered data, but can't use orderedDict
  455. # for backward compatibility with Python 2.6 and 3.4
  456. enumDict = []
  457. typeDict = []
  458. # An XML Definition is provided and will be parsed... now
  459. for x in self.__xmlDefinition__.childNodes:
  460. if x.nodeType == x.ELEMENT_NODE:
  461. fname = ""
  462. fdtype = ""
  463. enumVal = ""
  464. valueRank = None
  465. for at,av in x.attributes.items():
  466. if at == "DataType":
  467. fdtype = str(av)
  468. if fdtype in nodeset.aliases:
  469. fdtype = nodeset.aliases[fdtype]
  470. isEnum = False
  471. elif at == "Name":
  472. fname = str(av)
  473. elif at == "Value":
  474. enumVal = int(av)
  475. isSubType = False
  476. elif at == "ValueRank":
  477. valueRank = int(av)
  478. else:
  479. logger.warn("Unknown Field Attribute " + str(at))
  480. # This can either be an enumeration OR a structure, not both.
  481. # Figure out which of the dictionaries gets the newly read value pair
  482. if isEnum == isSubType:
  483. # This is an error
  484. logger.warn("DataType contains both enumeration and subtype (or neither)")
  485. self.__encodable__ = False
  486. break
  487. elif isEnum:
  488. # This is an enumeration
  489. enumDict.append((fname, enumVal))
  490. continue
  491. else:
  492. if fdtype == "":
  493. # If no datatype given use base datatype
  494. fdtype = "i=24"
  495. # This might be a subtype... follow the node defined as datatype to find out
  496. # what encoding to use
  497. fdTypeNodeId = NodeId(fdtype)
  498. fdTypeNodeId.ns = nodeset.namespaceMapping[self.modelUri][fdTypeNodeId.ns]
  499. if not fdTypeNodeId in nodeset.nodes:
  500. raise Exception("Node {} not found in nodeset".format(fdTypeNodeId))
  501. dtnode = nodeset.nodes[fdTypeNodeId]
  502. # The node in the datatype element was found. we inherit its encoding,
  503. # but must still ensure that the dtnode is itself validly encodable
  504. typeDict.append([fname, dtnode])
  505. fdtype = str(dtnode.browseName.name)
  506. logger.debug( prefix + fname + " : " + fdtype + " -> " + str(dtnode.id))
  507. subenc = dtnode.buildEncoding(nodeset=nodeset, indent=indent+1)
  508. self.__baseTypeEncoding__ = self.__baseTypeEncoding__ + [[fname, subenc, valueRank]]
  509. if not dtnode.isEncodable():
  510. # If we inherit an encoding from an unencodable not, this node is
  511. # also not encodable
  512. self.__encodable__ = False
  513. break
  514. # If we used inheritance to determine an encoding without alias, there is a
  515. # the possibility that lists got double-nested despite of only one element
  516. # being encoded, such as [['Int32']] or [['alias',['int32']]]. Remove that
  517. # enclosing list.
  518. while len(self.__baseTypeEncoding__) == 1 and isinstance(self.__baseTypeEncoding__[0], list):
  519. self.__baseTypeEncoding__ = self.__baseTypeEncoding__[0]
  520. if isOptionSet == True:
  521. self.__isOptionSet__ = True
  522. subenc = parentType.getEncoding()
  523. if not parentType.isEncodable():
  524. self.__encodable__ = False
  525. else:
  526. self.__baseTypeEncoding__ = self.__baseTypeEncoding__ + [self.browseName.name, subenc, None]
  527. self.__definition__ = enumDict
  528. return self.__baseTypeEncoding__
  529. if isEnum == True:
  530. self.__baseTypeEncoding__ = self.__baseTypeEncoding__ + ['Int32']
  531. self.__definition__ = enumDict
  532. self.__isEnum__ = True
  533. logger.debug( prefix+"Int32* -> enumeration with dictionary " + str(enumDict) + " encodable " + str(self.__encodable__))
  534. return self.__baseTypeEncoding__
  535. if indent==0:
  536. if not self.__encodable__:
  537. logger.debug( "Not encodable (partial): " + str(self.__baseTypeEncoding__))
  538. else:
  539. logger.debug( "Encodable as: " + str(self.__baseTypeEncoding__))
  540. self.__isEnum__ = False
  541. self.__definition__ = typeDict
  542. logger.debug( "")
  543. return self.__baseTypeEncoding__
  544. class ViewNode(Node):
  545. def __init__(self, xmlelement=None):
  546. Node.__init__(self)
  547. self.containsNoLoops = False
  548. self.eventNotifier = False
  549. if xmlelement:
  550. ViewNode.parseXML(self, xmlelement)
  551. def parseXML(self, xmlelement):
  552. Node.parseXML(self, xmlelement)
  553. for (at, av) in xmlelement.attributes.items():
  554. if at == "ContainsNoLoops":
  555. self.containsNoLoops = "false" not in av.lower()
  556. if at == "EventNotifier":
  557. self.eventNotifier = "false" not in av.lower()