3 from StringIO import StringIO
4 from datetime import datetime, timedelta
5 from sfa.util.xrn import *
6 from sfa.util.plxrn import hostname_to_urn
7 from sfa.util.faults import SfaNotImplemented, InvalidRSpec, InvalidRSpecElement
15 for (key, value) in filter.items():
20 if isinstance(value, str):
21 filter_list.append('%s="%s"' % (key, value))
22 elif isinstance(value, list):
23 filter_list.append('contains("%s", %s)' % (' '.join(map(str, value)), key))
25 xpath = ' and '.join(filter_list)
26 xpath = '[' + xpath + ']'
31 def __init__(self, xml=""):
35 self.namespaces = None
45 self.parse_rspec(self.template)
47 def parse_xml(self, xml):
49 parse rspec into etree
51 parser = etree.XMLParser(remove_blank_text=True)
53 tree = etree.parse(xml, parser)
55 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
57 tree = etree.parse(StringIO(xml), parser)
59 raise InvalidRSpec(str(e))
60 self.xml = tree.getroot()
62 def validate(self, schema):
64 Validate against rng schema
66 relaxng_doc = etree.parse(schema)
67 relaxng = etree.RelaxNG(relaxng_doc)
68 if not relaxng(self.xml):
69 error = relaxng.error_log.last_error
70 message = "%s (line %s)" % (error.message, error.line)
71 raise InvalidRSpec(message)
74 def xpath(self, xpath):
75 return self.xml.xpath(xpath, namespaces=self.namespaces)
77 def add_attribute(self, elem, name, value):
79 Add attribute to specified etree element
81 opt = etree.SubElement(elem, name)
84 def add_element(self, name, attrs={}, parent=None, text=""):
86 Generic wrapper around etree.SubElement(). Adds an element to
87 specified parent node. Adds element to root node is parent is
92 element = etree.SubElement(parent, name)
95 if isinstance(attrs, dict):
97 element.set(attr, attrs[attr])
100 def remove_attribute(self, elem, name, value):
102 Removes an attribute from an element
105 opts = elem.iterfind(name)
108 if opt.text == value:
111 def remove_element(self, element_name, root_node = None):
113 Removes all occurences of an element from the tree. Start at
114 specified root_node if specified, otherwise start at tree's root.
119 if not element_name.startswith('//'):
120 element_name = '//' + element_name
122 elements = root_node.xpath('%s ' % element_name, namespaces=self.namespaces)
123 for element in elements:
124 parent = element.getparent()
125 parent.remove(element)
127 def attributes_list(self, elem):
128 # convert a list of attribute tags into list of tuples
129 # (tagnme, text_value)
133 opts.append((e.tag, str(e.text).strip()))
136 def get_element_attributes(self, elem=None, depth=0):
138 elem = self.root_node
139 if not hasattr(elem, 'attrib'):
140 # this is probably not an element node with attribute. could be just and an
141 # attribute, return it
143 attrs = dict(elem.attrib)
144 attrs['text'] = str(elem.text).strip()
145 attrs['parent'] = elem.getparent()
146 if isinstance(depth, int) and depth > 0:
147 for child_elem in list(elem):
148 key = str(child_elem.tag)
150 attrs[key] = [self.get_element_attributes(child_elem, depth-1)]
152 attrs[key].append(self.get_element_attributes(child_elem, depth-1))
154 attrs['child_nodes'] = list(elem)
157 def merge(self, in_xml):
162 Optional method which inheriting classes can choose to implent.
169 def toxml(self, cleanup=False):
172 return self.header + etree.tostring(self.xml, pretty_print=True)
174 def save(self, filename):
175 f = open(filename, 'w')
176 f.write(self.toxml())
179 if __name__ == '__main__':
180 rspec = RSpec('/tmp/resources.rspec')