sbsv2/raptor/python/raptor_cache.py
author jjkang
Fri, 25 Jun 2010 18:37:20 +0800
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child 590 360bd6b35136
permissions -rw-r--r--
add releasing to new structure
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#
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# Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
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# All rights reserved.
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# This component and the accompanying materials are made available
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# under the terms of the License "Eclipse Public License v1.0"
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# which accompanies this distribution, and is available
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# at the URL "http://www.eclipse.org/legal/epl-v10.html".
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#
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# Initial Contributors:
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# Nokia Corporation - initial contribution.
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#
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# Contributors:
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#
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# Description: 
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# raptor_cache module
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# This module represents a cache of objects for a Raptor program.
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#
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import raptor_data
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import raptor_xml
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import generic_path
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import os
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# raptor_cache module attributes
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# raptor_cache module classes
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class Cache:
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	def __init__(self, Raptor):
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		self.raptor = Raptor
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		self.aliases = {}
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		self.groups = {}
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		self.interfaces = {}
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		self.variants = {}
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	def Load(self, gPathOrGPathList, cacheID = ""):
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		"""scan directory for xml files containing Raptor objects.
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		Input is either a generic path object or a list of
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		generic path objects.
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		If a cacheID is supplied then the loaded objects are
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		placed into containers which are marked with that ID.
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		This is useful for Interfaces which may be loaded from
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		several locations (different epoc32 trees for example)
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		but need to be kept separate.
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		"""
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		pathlist = []
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		filenames = []
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		# Create pathlist - this will be of length one if gPathOrGPathList is a
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		# generic path object; otherwise it's a list so just make all supplied paths generic
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		if isinstance(gPathOrGPathList, list):
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			pathlist = map(lambda x: x.GetLocalString(), gPathOrGPathList)
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		elif isinstance(gPathOrGPathList, generic_path.Path):
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			pathlist = [gPathOrGPathList.GetLocalString()]
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		else:
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			self.raptor.Warn("Empty list or blank path supplied.")
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		# Only when debugging, print the list. The for loop will be
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		# skipped if not in debug mode
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		if self.raptor.debugOutput:
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			for path in pathlist:
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				self.raptor.Debug("Loading XML cache from %s", path)
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		# Internal function to get the list of XML
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		# files recursively
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		def getXmlFiles(aDir, aFileList):
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			dirList = []
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			for fname in os.listdir(aDir):
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				path = os.path.join(aDir, fname)
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				if os.path.isdir(path):
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					dirList.append(path)
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				else: # It's a file
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					if path.endswith(".xml"): # Only files ending in .xml get added
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						aFileList.append(path)
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			# Now iterate over directory list; this way, the files in the top level of
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			# aDir will be added before all files in any subdirectory of aDir
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			for dir in dirList:
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				getXmlFiles(dir, aFileList)
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		# This will add all files in all top level directories and all XML files
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		for path in pathlist:
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			# gPathOrGPathList passed to Load() can be a file or a
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			# directory, or a list of files or directories or both
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			if os.path.isfile(path):
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				if path.endswith(".xml"): # Only files whose names end in .xml get added
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					filenames.append(path)
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			elif os.path.isdir(path):
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				getXmlFiles(path, filenames)
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			else: # it isn't a file or directory
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				self.raptor.Warn("No file or directory found for '%s'", path)
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		if not filenames:
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			# No XML files found in any of the paths
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			return
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		# Parse XML files, and add the objects to our
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		# configuration/interface/variant dictionaries
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		for fullpath in filenames:
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			try:
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				objects = raptor_xml.Read(self.raptor, fullpath)
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			except raptor_xml.XMLError:
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				self.raptor.Warn("Failed to read XML file %s", fullpath)
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				continue
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			self.raptor.Debug("%d objects found in XML file %s", len(objects), fullpath)
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			for obj in objects:
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				# top-level objects need to know which XML file they came from.
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				obj.SetSourceFile(fullpath)
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				try:
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					self.AddObject(obj, cacheID)
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				except UnexpectedObjectError:
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					self.raptor.Warn("Unexpected object %s", str(obj))
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	def AddObject(self, obj, cacheID):
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		"""add a Group, Alias, Interface or Variant.
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		The cacheID is only used to separate Interfaces.
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		"""
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		if isinstance(obj, raptor_data.Group):
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			self.AddGroup(obj)
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		elif isinstance(obj, raptor_data.Alias):
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			self.AddAlias(obj)
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		elif isinstance(obj, raptor_data.Interface):
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			self.AddInterface(obj, cacheID)
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		elif isinstance(obj, raptor_data.Variant):
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			self.AddVariant(obj)
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		else:
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			raise UnexpectedObjectError
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	def FindNamedGroup(self, name):
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		return self.groups[name]
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	def AddGroup(self, obj):
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		if obj.name in self.groups:
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			self.WarnDuplicate("group", self.groups[obj.name], obj)
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			return
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		obj.SetOwner(self.raptor)
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		self.groups[obj.name] = obj
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	def FindNamedAlias(self, name):
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		return self.aliases[name]
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	def AddAlias(self, obj):
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		if obj.name in self.aliases:
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			self.WarnDuplicate("alias", self.aliases[obj.name], obj)
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			return
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		obj.SetOwner(self.raptor)
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		self.aliases[obj.name] = obj
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	def FindNamedInterface(self, name, cacheID = ""):
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		try:
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			return self.interfaces[cacheID][name]
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		except KeyError, e:
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			if cacheID == "":
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				raise e
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			else:
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				return self.interfaces[""][name]
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	def AddInterface(self, obj, cacheID):
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		if not cacheID in self.interfaces:
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			self.interfaces[cacheID] = {}
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		if obj.name in self.interfaces[cacheID]:
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			self.WarnDuplicate("interface", self.interfaces[cacheID][obj.name], obj)
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			return
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		obj.SetOwner(self.raptor)
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		obj.cacheID = cacheID
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		self.interfaces[cacheID][obj.name] = obj
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	def FindNamedVariant(self, name):
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		return self.variants[name]
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	def AddVariant(self, obj):
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		# anonymous variants can never be referenced, so ignore them
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		if obj.name:
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			if self.variants.has_key(obj.name):
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				self.WarnDuplicate("variant", self.variants[obj.name], obj)
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				return
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			obj.SetOwner(self.raptor)
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			self.variants[obj.name] = obj
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	def WarnDuplicate(self, type, objOld, objNew):
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		"""tell us where duplicate objects came from."""
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		oldSource = objOld.source
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		if oldSource == None:
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			oldSource = "unknown"
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		newSource = objNew.source
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		if newSource == None:
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			newSource = "unknown"
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		# don't warn if we are reloading the object from the same
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		# file as before: since that is quite ligitimate.
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		if oldSource == newSource and oldSource != "unknown":
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			return
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		# actually this is just for information not a warning
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		self.raptor.Info("Duplicate %s '%s' (the one from '%s' will override the one in '%s')",
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						 type, objOld.name, oldSource, newSource)
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class UnexpectedObjectError(Exception):
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	pass
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# end of the raptor_cache module