xmlmarshaller.py

wxPython的基本示例程序

                    elif (not isinstance(xmlnametuple, (tuple, list))):
                        flattenDict[str(xmlnametuple)] = sequencename
                    else:
                        for xmlname in xmlnametuple:
                            flattenDict[xmlname] = sequencename
            else:
                raise Exception("Invalid type for __xmlflattensequence___ : it must be a dict")

        # reattach an object"s attributes to it
        for childname, child in element.children:
            if (childname in flattenDict):
                sequencename = _toAttrName(obj, flattenDict[childname])
                if (not hasattr(obj, sequencename)):
                    obj.__dict__[sequencename] = []
                sequencevalue = getattr(obj, sequencename)
                if (sequencevalue == None):
                    obj.__dict__[sequencename] = []
                    sequencevalue = getattr(obj, sequencename)
                sequencevalue.append(child)
            elif (objtype == "list"):
                obj.append(child)
            elif isinstance(obj, dict):
                if (childname == DICT_ITEM_NAME):
                    obj[child[DICT_ITEM_KEY_NAME]] = child[DICT_ITEM_VALUE_NAME]
                else:
                    obj[childname] = child
            else:
                # don't replace a good attribute value with a bad one
                childAttrName = _toAttrName(obj, childname)
                if (not hasattr(obj, childAttrName)) or (getattr(obj, childAttrName) == None) or (getattr(obj, childAttrName) == []) or (not isinstance(child, GenericXMLObject)):
                    try:
                        setattrignorecase(obj, childAttrName, child)
                    except AttributeError:
                        raise MarshallerException("Error unmarshalling child element \"%s\" of XML element \"%s\": object type not specified or known" % (childname, name))

        if (complexType != None):
            for element in complexType.elements:
                if element.default:
                    elementName = _toAttrName(obj, element.name)
                    if ((elementName not in obj.__dict__) or (obj.__dict__[elementName] == None)):
                        langType = xsdToLangType(element.type)
                        defaultValue = _objectfactory(langType, element.default)
                        obj.__dict__[elementName] = defaultValue

        ifDefPy()
        if (isinstance(obj, list)):
            if ((element.attrs.has_key("mutable")) and (element.attrs.getValue("mutable") == "false")):
                obj = tuple(obj)
        endIfDef()
            
        if (len(self.elementstack) > 0):
##            print "[endElement] appending child with name: ", name, "; objtype: ", objtype
            parentElement.children.append((name, obj))
        else:
            self.rootelement = obj
            
    def getRootObject(self):
        return self.rootelement

def _toAttrName(obj, name):
    if (hasattr(obj, "__xmlrename__")):
        for key, val in obj.__xmlrename__.iteritems():
            if (name == val):
                name = key
                break
##    if (name.startswith("__") and not name.endswith("__")):
##        name = "_%s%s" % (obj.__class__.__name__, name)
    return str(name)
    
def printKnownTypes(kt, where):
    print 'KnownTypes from %s' % (where)
    for tag, cls in kt.iteritems():
        print '%s => %s' % (tag, str(cls))

__typeMappingXsdToLang = {
    "string": "str",
    "char": "str",
    "varchar": "str",
    "date": "str", # ToDO Need to work out how to create lang date types
    "boolean": "bool",
    "decimal": "float", # ToDO Does python have a better fixed point type?
    "int": "int",
    "integer":"int",
    "long": "long",
    "float": "float",
    "bool": "bool",
    "str": "str",
    "unicode": "unicode",
    "short": "int",
    "duration": "str", # see above (date)
    "datetime": "str", # see above (date)
    "time": "str", # see above (date)
    "double": "float",
    "QName" : "str",
    "blob" : "str",         # ag:blob
    "currency" : "str",     # ag:currency
    }    

def xsdToLangType(xsdType):
    if xsdType.startswith(XMLSCHEMA_XSD_URL):
        xsdType = xsdType[len(XMLSCHEMA_XSD_URL)+1:]
    elif xsdType.startswith(AG_URL):
        xsdType = xsdType[len(AG_URL)+1:]
    langType = __typeMappingXsdToLang.get(xsdType)
    if (langType == None):
        raise Exception("Unknown xsd type %s" % xsdType)
    return langType
    
def langToXsdType(langType):
    if langType in asDict(__typeMappingXsdToLang):
        return '%s:%s' % (XMLSCHEMA_XSD_URL, langType)
    return langType

def _getXmlValue(langValue):
    if (isinstance(langValue, bool)):
        return str(langValue).lower()
    elif (isinstance(langValue, unicode)):
        return langValue.encode()
    else:
        return str(langValue)

def unmarshal(xmlstr, knownTypes=None, knownNamespaces=None, xmlSource=None, createGenerics=False):
    objectfactory = XMLObjectFactory(knownTypes, knownNamespaces, xmlSource, createGenerics)
    # on Linux, pyXML's sax.parseString fails when passed unicode
    if (not sysutils.isWindows()):
        xmlstr = str(xmlstr)
    try:
        xml.sax.parseString(xmlstr, objectfactory)
    except xml.sax.SAXParseException, errorData:
        if xmlSource == None:
            xmlSource = 'unknown'
        errorString = 'SAXParseException ("%s") detected at line %d, column %d in XML document from source "%s" ' % (errorData.getMessage(), errorData.getLineNumber(), errorData.getColumnNumber(), xmlSource)
        raise UnmarshallerException(errorString)
    return objectfactory.getRootObject()

def marshal(obj, elementName=None, prettyPrint=False, marshalType=True, indent=0, knownTypes=None, knownNamespaces=None, encoding=-1):
    worker = XMLMarshalWorker(prettyPrint=prettyPrint, marshalType=marshalType, knownTypes=knownTypes, knownNamespaces=knownNamespaces)    
    if obj != None and hasattr(obj, '__xmldeepexclude__'):
        worker.xmldeepexclude = obj.__xmldeepexclude__
    xmlstr = "".join(worker._marshal(obj, elementName, indent=indent))
    aglogging.info(xmlMarshallerLogger, "marshal produced string of type %s", type(xmlstr))
    if (encoding == None):
        return xmlstr
    if (not isinstance(encoding, basestring)):
        encoding = sys.getdefaultencoding()
    if (not isinstance(xmlstr, unicode)):
        xmlstr = xmlstr.decode()
    xmlstr = u'<?xml version="1.0" encoding="%s"?>\n%s' % (encoding, xmlstr)
    return xmlstr.encode(encoding)

class XMLMarshalWorker(object):
    def __init__(self, marshalType=True, prettyPrint=False, knownTypes=None, knownNamespaces=None):
        if knownTypes == None:
            self.knownTypes = {}
        else:
            self.knownTypes = knownTypes
        if knownNamespaces == None:
            self.knownNamespaces = {}
        else:
            self.knownNamespaces = knownNamespaces
        self.prettyPrint = prettyPrint
        self.marshalType = marshalType
        self.xmldeepexclude = []
        self.nsstack = []

    def getNSPrefix(self):
        if len(self.nsstack) > 0:
            return self.nsstack[-1].prefix
        return ''

    def isKnownType(self, elementName):
        tagLongNs = None
        nse = self.nsstack[-1]
        i = elementName.rfind(':')
        if i > 0:
            prefix = elementName[:i]
            name = elementName[i+1:]
        else:
            prefix = DEFAULT_NAMESPACE_KEY
            name = elementName
        for shortNs, longNs in nse.nameSpaces.iteritems():
            if shortNs == prefix:
                tagLongNs = longNs
                break
        if tagLongNs == None:
            knownTagName = elementName
        else:
            knownShortNs = self.knownNamespaces[tagLongNs]
            knownTagName = knownShortNs + ':' + name
        if (knownTagName in asDict(self.knownTypes)):
            knownClass = self.knownTypes[knownTagName]
            return True
        return False
                      
    def popNSStack(self):
        self.nsstack.pop()

    def appendNSStack(self, obj):
        nameSpaces = {}
        defaultLongNS = None
        for nse in self.nsstack:
            for k, v in nse.nsMap.iteritems():
                nameSpaces[k] = v
                if k == DEFAULT_NAMESPACE_KEY:
                    defaultLongNS = v
        newNS = NsElement()
        nameSpaceAttrs = ""
        if hasattr(obj, "__xmlnamespaces__"):
            ns = getattr(obj, "__xmlnamespaces__")
            keys = ns.keys()
            keys.sort()
            for nameSpaceKey in keys:
                nameSpaceUrl = ns[nameSpaceKey]
                if nameSpaceUrl in nameSpaces.values():
                    for k, v in nameSpaces.iteritems():
                        if v == nameSpaceUrl:
                            nameSpaceKey = k
                            break
                else:
                    if nameSpaceKey == "":
                        defaultLongNS = nameSpaceUrl
                        nameSpaces[DEFAULT_NAMESPACE_KEY] = nameSpaceUrl
                        newNS.nsMap[DEFAULT_NAMESPACE_KEY] = nameSpaceUrl
                        nameSpaceAttrs += ' xmlns="%s" ' % (nameSpaceUrl)
                    else:
                        nameSpaces[nameSpaceKey] = nameSpaceUrl
                        newNS.nsMap[nameSpaceKey] = nameSpaceUrl
                        nameSpaceAttrs += ' xmlns:%s="%s" ' % (nameSpaceKey, nameSpaceUrl)
            nameSpaceAttrs = nameSpaceAttrs.rstrip()
        if len(self.nsstack) > 0:
            newNS.prefix = self.nsstack[-1].prefix
        else:
            newNS.prefix = ''
        if obj != None and hasattr(obj, "__xmldefaultnamespace__"):
            longPrefixNS = getattr(obj, "__xmldefaultnamespace__")
            if longPrefixNS == defaultLongNS:
                newNS.prefix = ''
            else:
                try:
                    for k, v in nameSpaces.iteritems():
                        if v == longPrefixNS:
                            newNS.prefix = k + ':'
                            break;
                except:
                    if (longPrefixNS in asDict(self.knownNamespaces)):
                        newNS.prefix = self.knownNamespaces[longPrefixNS] + ':'
                    else:
                        raise MarshallerException('Error marshalling __xmldefaultnamespace__ ("%s") not defined in namespace stack' % (longPrefixNS))
        if obj != None and hasattr(obj, "targetNamespace"):
            newNS.targetNS = obj.targetNamespace
        elif len(self.nsstack) > 0:
            newNS.targetNS = self.nsstack[-1].targetNS
        newNS.nameSpaces = nameSpaces
        self.nsstack.append(newNS)
        return nameSpaceAttrs       

    def contractQName(self, value, obj, attr):
        value = langToXsdType(value)
        i = value.rfind(':')
        if i >= 0:
            longNS = value[:i]
        else:
            # the value doesn't have a namespace and we couldn't map it to an XSD type...what to do?
            # (a) just write it, as is, and hope it's in the default namespace (for now)
            # (b) throw an exception so we can track down the bad code (later)
            return value
        if (longNS in self.nsstack[-1].nameSpaces.values()):
            for kShort, vLong in self.nsstack[-1].nameSpaces.iteritems():
                if vLong == longNS:
                    shortNS = kShort
                    break
        else:
            shortNS = longNS    # if we can't find the long->short mappping, just use longNS
        if shortNS == DEFAULT_NAMESPACE_KEY:
            value = value[i+1:]
        else:
            value = shortNS + ':' + value[i+1:]
        return value

    def _genObjTypeStr(self, typeString):
        if self.marshalType:
            return ' objtype="%s"' % typeString
        return ""
            
    def _marshal(self, obj, elementName=None, nameSpacePrefix="", indent=0):
        if (obj != None):
            aglogging.debug(xmlMarshallerLogger, "--> _marshal: elementName=%s%s, type=%s, obj=%s, indent=%d", nameSpacePrefix, elementName, type(obj), str(obj), indent)
        else:
            aglogging.debug(xmlMarshallerLogger, "--> _marshal: elementName=%s%s, obj is None, indent=%d", nameSpacePrefix, elementName, indent)
        if ((obj != None) and (hasattr(obj, 'preMarshal'))):
            obj.preMarshal()
        excludeAttrs = []
        excludeAttrs.extend(self.xmldeepexclude)
        if hasattr(obj, "__xmlexclude__"):
            excludeAttrs.extend(obj.__xmlexclude__)
        prettyPrint = self.prettyPrint
        knownTypes = self.knownTypes
        xmlString = None
        if self.prettyPrint or indent:
            prefix = " "*indent
            newline = "\n"
            increment = 2
        else:
            prefix = ""
            newline = ""
            increment = 0
        ## Determine the XML element name. If it isn"t specified in the