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# R overlay --
# Copyright 2006-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
class DepEnv ( object ):
STATUS_UNDONE = 1
STATUS_RESOLVED = 2
STATUS_UNRESOLVABLE = 4
def __init__ ( self, dep_str ):
"""Initializes a dependency environment that represents the dependency
resolution of one entry in the description data of an R package.
arguments:
* dep_str -- dependency string at it appears in the description data.
"""
self.ident = id ( self )
self.dep_str = dep_str
self.dep_str_low = dep_str.lower()
self.status = DepEnv.STATUS_UNDONE
self.resolved_by = None
# TODO: analyze dep_str:
# extract dep name, dep version, useless comments,...
# --- end of __init__ (...) ---
def set_resolved ( self, resolved_by, append=False ):
"""Marks this DepEnv as resolved with resolved_by as corresponding
portage package.
arguments:
* resolved_by -- resolving portage package
* append -- whether to append resolved_by or not; NOT IMPLEMENTED
"""
if self.resolved_by is None:
self.resolved_by = resolved_by
elif append:
# useful?
raise Exception ( "appending is not supported..." )
else:
raise Exception (
"dependency is already resolved and append is disabled."
)
# add RESOLVED status
self.status |= DepEnv.STATUS_RESOLVED
# --- end of set_resolved (...) ---
def set_unresolvable ( self, force=False ):
"""Marks this DepEnv as unresolvable.
arguments:
force -- force unresolvable status even if this DepEnv
is already resolved
"""
if force or not self.status & DepEnv.STATUS_RESOLVED:
self.resolved_by = None
self.status |= DepEnv.STATUS_UNRESOLVABLE
else:
raise Exception ("dependency is already marked as resolved." )
# --- end of set_unresolvable (...) ---
def zap ( self ):
"""Resets the status of this DepEnv and clears out all resolving pkgs."""
self.status = DepEnv.STATUS_UNDONE
self.resolved_by = None
# --- end of zap (...) ---
def is_resolved ( self ):
"""Returns True if this DepEnv is resolved, else false."""
return bool ( self.status & DepEnv.STATUS_RESOLVED )
# --- end of is_resolved (...) ---
def get_result ( self ):
"""Returns the result of this DepEnv as a tuple
( original dep str, resolving portage package ) where resolving portage
package may be None.
"""
return ( self.dep_str, self.resolved_by )
# --- end of get_result (...) ---
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