def _parseEnv(self, env=None):
if not env:<EOL><INDENT>env = self._env<EOL><DEDENT>if '<STR_LIT>' in env:<EOL><INDENT>self._stateFile = env.get('<STR_LIT>')<EOL><DEDENT>else:<EOL><INDENT>self._stateFile = '<STR_LIT>' % self.plugin_name<EOL><DEDENT>if '<STR_LIT>' in env:<EOL><INDENT>self._dirtyConfig = True<EOL><DEDENT>
Private method for parsing through environment variables.

        Parses for environment variables common to all Munin Plugins:
            - MUNIN_STATEFILE
            - MUNIN_CAP_DIRTY_CONFIG
            - nested_graphs

        @param env: Dictionary of environment variables.
                    (Only used for testing. initialized automatically by 
                    constructor.