"""This generator provides rule-based entry mappings."""
__revision__ = '$Revision$'

import re
import Bcfg2.Server.Plugin
import Bcfg2.Server.Plugins.Rules

class Defaults(Bcfg2.Server.Plugins.Rules.Rules,
               Bcfg2.Server.Plugin.StructureValidator):
    """Set default attributes on bound entries"""
    name = 'Defaults'
    __version__ = '$Id$'
    __author__ = 'bcfg-dev@mcs.anl.gov'

    # Rules is a Generator that happens to implement all of the
    # functionality we want, so we overload it, but Defaults should
    # _not_ handle any entries; it does its stuff in the structure
    # validation phase.  so we overload Handle(s)Entry and HandleEvent
    # to ensure that Defaults handles no entries, even though it's a
    # Generator.

    def HandlesEntry(self, entry, metadata):
        return False

    def HandleEntry(self, entry, metadata):
        raise PluginExecutionError

    def HandleEvent(self, event):
        Bcfg2.Server.Plugin.XMLDirectoryBacked.HandleEvent(self, event)

    def validate_structures(self, metadata, structures):
        """ Apply defaults """
        for struct in structures:
            for entry in struct.iter():
                if entry.tag.startswith("Bound"):
                    is_bound = True
                    entry.tag = entry.tag[5:]
                else:
                    is_bound = False
                try:
                    try:
                        self.BindEntry(entry, metadata)
                    except Bcfg2.Server.Plugin.PluginExecutionError:
                        # either no matching defaults (which is okay),
                        # or multiple matching defaults (which is not
                        # okay, but is logged).  either way, we don't
                        # care about the error.
                        pass
                finally:
                    if is_bound:
                        entry.tag = "Bound" + entry.tag

    def _regex_enabled(self):
        """ Defaults depends on regex matching, so force it enabled """
        return True
