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"""
Copyright 2008-2011 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
"""
from Element import Element
from . import odict
class Connection(Element):
def __init__(self, flow_graph, porta, portb):
"""
Make a new connection given the parent and 2 ports.
@param flow_graph the parent of this element
@param porta a port (any direction)
@param portb a port (any direction)
@throws Error cannot make connection
@return a new connection
"""
Element.__init__(self, flow_graph)
source = sink = None
#separate the source and sink
for port in (porta, portb):
if port.is_source(): source = port
if port.is_sink(): sink = port
if not source: raise ValueError('Connection could not isolate source')
if not sink: raise ValueError('Connection could not isolate sink')
#ensure that this connection (source -> sink) is unique
for connection in self.get_parent().get_connections():
if connection.get_source() is source and connection.get_sink() is sink:
raise Exception('This connection between source and sink is not unique.')
self._source = source
self._sink = sink
def __str__(self):
return 'Connection (\n\t%s\n\t\t%s\n\t%s\n\t\t%s\n)'%(
self.get_source().get_parent(),
self.get_source(),
self.get_sink().get_parent(),
self.get_sink(),
)
def is_connection(self): return True
def validate(self):
"""
Validate the connections.
The ports must match in type.
"""
Element.validate(self)
source_type = self.get_source().get_type()
sink_type = self.get_sink().get_type()
if source_type != sink_type:
self.add_error_message('Source type "%s" does not match sink type "%s".'%(source_type, sink_type))
def get_enabled(self):
"""
Get the enabled state of this connection.
@return true if source and sink blocks are enabled
"""
return self.get_source().get_parent().get_enabled() and \
self.get_sink().get_parent().get_enabled()
#############################
# Access Ports
#############################
def get_sink(self): return self._sink
def get_source(self): return self._source
##############################################
## Import/Export Methods
##############################################
def export_data(self):
"""
Export this connection's info.
@return a nested data odict
"""
n = odict()
n['source_block_id'] = self.get_source().get_parent().get_id()
n['sink_block_id'] = self.get_sink().get_parent().get_id()
n['source_key'] = self.get_source().get_key()
n['sink_key'] = self.get_sink().get_key()
return n
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