--- /dev/null
+#!/usr/bin/python
+from lxml import etree
+from StringIO import StringIO
+from datetime import datetime, timedelta
+from sfa.util.xrn import *
+from sfa.util.plxrn import hostname_to_urn
+from sfa.util.faults import SfaNotImplemented, InvalidRSpec, InvalidRSpecElement
+
+class XpathFilter:
+ @staticmethod
+ def xpath(filter={}):
+ xpath = ""
+ if filter:
+ filter_list = []
+ for (key, value) in filter.items():
+ if key == 'text':
+ key = 'text()'
+ else:
+ key = '@'+key
+ if isinstance(value, str):
+ filter_list.append('%s="%s"' % (key, value))
+ elif isinstance(value, list):
+ filter_list.append('contains("%s", %s)' % (' '.join(map(str, value)), key))
+ if filter_list:
+ xpath = ' and '.join(filter_list)
+ xpath = '[' + xpath + ']'
+ return xpath
+
+class XMLInterface:
+
+ def __init__(self, xml="", namespaces={}):
+ self.header = '<?xml version="1.0"?>\n'
+ self.template = """<RSpec></RSpec>"""
+ self.xml = None
+ self.namespaces = namespaces
+ if xml:
+ self.parse_xml(xml)
+ else:
+ self.create()
+
+ def create(self):
+ """
+ Create root element
+ """
+ self.parse_rspec(self.template, self.namespaces)
+
+ def parse_xml(self, xml):
+ """
+ parse rspec into etree
+ """
+ parser = etree.XMLParser(remove_blank_text=True)
+ try:
+ tree = etree.parse(xml, parser)
+ except IOError:
+ # 'rspec' file doesnt exist. 'rspec' is proably an xml string
+ try:
+ tree = etree.parse(StringIO(xml), parser)
+ except Exception, e:
+ raise InvalidRSpec(str(e))
+ self.xml = tree.getroot()
+
+ def validate(self, schema):
+ """
+ Validate against rng schema
+ """
+
+ relaxng_doc = etree.parse(schema)
+ relaxng = etree.RelaxNG(relaxng_doc)
+ if not relaxng(self.xml):
+ error = relaxng.error_log.last_error
+ message = "%s (line %s)" % (error.message, error.line)
+ raise InvalidRSpec(message)
+ return True
+
+ def xpath(self, xpath):
+ return self.xml.xpath(xpath, namespaces=self.namespaces)
+
+ def add_attribute(self, elem, name, value):
+ """
+ Add attribute to specified etree element
+ """
+ opt = etree.SubElement(elem, name)
+ opt.text = value
+
+ def add_element(self, name, attrs={}, parent=None, text=""):
+ """
+ Generic wrapper around etree.SubElement(). Adds an element to
+ specified parent node. Adds element to root node is parent is
+ not specified.
+ """
+ if parent == None:
+ parent = self.xml
+ element = etree.SubElement(parent, name)
+ if text:
+ element.text = text
+ if isinstance(attrs, dict):
+ for attr in attrs:
+ element.set(attr, attrs[attr])
+ return element
+
+ def remove_attribute(self, elem, name, value):
+ """
+ Removes an attribute from an element
+ """
+ if elem is not None:
+ opts = elem.iterfind(name)
+ if opts is not None:
+ for opt in opts:
+ if opt.text == value:
+ elem.remove(opt)
+
+ def remove_element(self, element_name, root_node = None):
+ """
+ Removes all occurences of an element from the tree. Start at
+ specified root_node if specified, otherwise start at tree's root.
+ """
+ if not root_node:
+ root_node = self.xml
+
+ if not element_name.startswith('//'):
+ element_name = '//' + element_name
+
+ elements = root_node.xpath('%s ' % element_name, namespaces=self.namespaces)
+ for element in elements:
+ parent = element.getparent()
+ parent.remove(element)
+
+ def attributes_list(self, elem):
+ # convert a list of attribute tags into list of tuples
+ # (tagnme, text_value)
+ opts = []
+ if elem is not None:
+ for e in elem:
+ opts.append((e.tag, str(e.text).strip()))
+ return opts
+
+ def get_element_attributes(self, elem=None, depth=0):
+ if elem == None:
+ elem = self.root_node
+ if not hasattr(elem, 'attrib'):
+ # this is probably not an element node with attribute. could be just and an
+ # attribute, return it
+ return elem
+ attrs = dict(elem.attrib)
+ attrs['text'] = str(elem.text).strip()
+ attrs['parent'] = elem.getparent()
+ if isinstance(depth, int) and depth > 0:
+ for child_elem in list(elem):
+ key = str(child_elem.tag)
+ if key not in attrs:
+ attrs[key] = [self.get_element_attributes(child_elem, depth-1)]
+ else:
+ attrs[key].append(self.get_element_attributes(child_elem, depth-1))
+ else:
+ attrs['child_nodes'] = list(elem)
+ return attrs
+
+ def merge(self, in_xml):
+ pass
+
+ def cleanup(self):
+ """
+ Optional method which inheriting classes can choose to implent.
+ """
+ pass
+
+ def __str__(self):
+ return self.toxml()
+
+ def toxml(self, cleanup=False):
+ if cleanup:
+ self.cleanup()
+ return self.header + etree.tostring(self.xml, pretty_print=True)
+
+ def save(self, filename):
+ f = open(filename, 'w')
+ f.write(self.toxml())
+ f.close()
+
+if __name__ == '__main__':
+ rspec = RSpec('/tmp/resources.rspec')
+ print rspec
+