1 files changed, 97 insertions, 0 deletions
diff --git a/grc/src/grc/elements/Element.py b/grc/src/grc/elements/Element.py
new file mode 100644
index 000000000..b90f775c5
--- /dev/null
+++ b/grc/src/grc/elements/Element.py
@@ -0,0 +1,97 @@
+"""
+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
+"""
+##@package grc.elements.Element
+#The base class for all elements.
+#@author Josh Blum
+
+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
+		try: self.validate()
+		except: pass
+		return not self.get_error_messages()
+
+	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
+