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"""
Copyright 2008-2015 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 __future__ import absolute_import
from .base import Element
from .utils.descriptors import lazy_property
class Connection(Element):
is_connection = True
def __init__(self, parent, source, sink):
"""
Make a new connection given the parent and 2 ports.
Args:
flow_graph: the parent of this element
source: a port (any direction)
sink: a port (any direction)
@throws Error cannot make connection
Returns:
a new connection
"""
Element.__init__(self, parent)
if not source.is_source:
source, sink = sink, source
if not source.is_source:
raise ValueError('Connection could not isolate source')
if not sink.is_sink:
raise ValueError('Connection could not isolate sink')
self.source_port = source
self.sink_port = sink
def __str__(self):
return 'Connection (\n\t{}\n\t\t{}\n\t{}\n\t\t{}\n)'.format(
self.source_block, self.source_port, self.sink_block, self.sink_port,
)
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.source_port == other.source_port and self.sink_port == other.sink_port
def __hash__(self):
return hash((self.source_port, self.sink_port))
def __iter__(self):
return iter((self.source_port, self.sink_port))
@lazy_property
def source_block(self):
return self.source_port.parent_block
@lazy_property
def sink_block(self):
return self.sink_port.parent_block
@lazy_property
def type(self):
return self.source_port.domain, self.sink_port.domain
@property
def enabled(self):
"""
Get the enabled state of this connection.
Returns:
true if source and sink blocks are enabled
"""
return self.source_block.enabled and self.sink_block.enabled
def validate(self):
"""
Validate the connections.
The ports must match in io size.
"""
Element.validate(self)
platform = self.parent_platform
if self.type not in platform.connection_templates:
self.add_error_message('No connection known between domains "{}" and "{}"'
''.format(*self.type))
source_size = self.source_port.item_size
sink_size = self.sink_port.item_size
if source_size != sink_size:
self.add_error_message('Source IO size "{}" does not match sink IO size "{}".'.format(source_size, sink_size))
##############################################
# Import/Export Methods
##############################################
def export_data(self):
"""
Export this connection's info.
Returns:
a nested data odict
"""
return (
self.source_block.name, self.source_port.key,
self.sink_block.name, self.sink_port.key
)
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