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43e6a43e3d
All of the removed `from __future__ import` were needed in older versions of Python (mostly 2.5.x and below) but later became mandatory in most versions of Python 3 hence are not necessary anymore. More specifically, according to __future__.py[1]: - unicode_literals is part of Python since versions 2.6.0 and 3.0.0; - print_function is part of Python since versions 2.6.0 and 3.0.0; - absolute_import is part of Python since versions 2.5.0 and 3.0.0; - division is part of Python since versions 2.2.0 and 3.0.0; Get rid of those unnecessary imports to slightly clean up the codebase. [1] https://github.com/python/cpython/blob/master/Lib/__future__.py
112 lines
3.1 KiB
Python
112 lines
3.1 KiB
Python
"""
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Copyright 2008-2015 Free Software Foundation, Inc.
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This file is part of GNU Radio
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SPDX-License-Identifier: GPL-2.0-or-later
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"""
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from .base import Element
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from .utils.descriptors import lazy_property
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class Connection(Element):
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is_connection = True
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def __init__(self, parent, source, sink):
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"""
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Make a new connection given the parent and 2 ports.
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Args:
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flow_graph: the parent of this element
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source: a port (any direction)
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sink: a port (any direction)
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@throws Error cannot make connection
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Returns:
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a new connection
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"""
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Element.__init__(self, parent)
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if not source.is_source:
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source, sink = sink, source
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if not source.is_source:
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raise ValueError('Connection could not isolate source')
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if not sink.is_sink:
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raise ValueError('Connection could not isolate sink')
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self.source_port = source
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self.sink_port = sink
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def __str__(self):
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return 'Connection (\n\t{}\n\t\t{}\n\t{}\n\t\t{}\n)'.format(
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self.source_block, self.source_port, self.sink_block, self.sink_port,
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)
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return NotImplemented
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return self.source_port == other.source_port and self.sink_port == other.sink_port
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def __hash__(self):
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return hash((self.source_port, self.sink_port))
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def __iter__(self):
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return iter((self.source_port, self.sink_port))
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@lazy_property
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def source_block(self):
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return self.source_port.parent_block
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@lazy_property
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def sink_block(self):
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return self.sink_port.parent_block
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@lazy_property
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def type(self):
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return self.source_port.domain, self.sink_port.domain
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@property
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def enabled(self):
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"""
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Get the enabled state of this connection.
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Returns:
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true if source and sink blocks are enabled
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"""
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return self.source_block.enabled and self.sink_block.enabled
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def validate(self):
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"""
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Validate the connections.
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The ports must match in io size.
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"""
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Element.validate(self)
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platform = self.parent_platform
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if self.type not in platform.connection_templates:
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self.add_error_message('No connection known between domains "{}" and "{}"'
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''.format(*self.type))
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source_size = self.source_port.item_size
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sink_size = self.sink_port.item_size
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if source_size != sink_size:
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self.add_error_message('Source IO size "{}" does not match sink IO size "{}".'.format(source_size, sink_size))
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##############################################
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# Import/Export Methods
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##############################################
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def export_data(self):
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"""
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Export this connection's info.
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Returns:
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a nested data odict
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"""
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return (
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self.source_block.name, self.source_port.key,
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self.sink_block.name, self.sink_port.key
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)
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