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"""
Copyright 2008 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
class Element(object):
def __init__(self, parent=None):
self._parent = parent
self._error_messages = []
self.flag()
def test(self):
"""
Test the element against failures.
Overload this method in sub-classes.
"""
pass
def validate(self):
"""
Validate the data in this element.
Set the error message non blank for errors.
Overload this method in sub-classes.
"""
pass
def is_valid(self):
self._error_messages = []#reset err msgs
if self.get_enabled():
try: self.validate()
except: pass
return not self.get_error_messages()
def get_enabled(self): return True
def _add_error_message(self, msg):
self._error_messages.append(msg)
def get_error_messages(self):
return self._error_messages
def get_parent(self):
return self._parent
def _exit_with_error(self, error):
parent = self
#build hier list of elements
elements = list()
while(parent):
elements.insert(0, parent)
parent = parent.get_parent()
#build error string
err_str = ">>> Error:"
for i, element in enumerate(elements + [error]):
err_str = err_str + '\n' + ''.join(' '*(i+2)) + str(element)
err_str = err_str + '\n'
exit(err_str)
##############################################
## Update flagging
##############################################
def is_flagged(self): return self._flag
def flag(self):
self._flag = True
if self.get_parent(): self.get_parent().flag()
def deflag(self):
self._flag = False
if self.get_parent(): self.get_parent().deflag()
##############################################
## Type testing methods
##############################################
def is_element(self): return True
def is_platform(self): return False
def is_flow_graph(self): return False
def is_connection(self): return False
def is_block(self): return False
def is_source(self): return False
def is_sink(self): return False
def is_port(self): return False
def is_param(self): return False
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