#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  This program 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.
#
#  This program 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Crawl base and sample classes.

$Id$
"""

from zope.interface import implements

from cybertools.agent.base.agent import Master
from cybertools.agent.core.agent import QueueableAgent
from cybertools.agent.interfaces import ICrawler
from cybertools.agent.interfaces import IResource, IMetadataSet
from cybertools.agent.components import agents
from twisted.internet.defer import succeed


class Crawler(QueueableAgent):

    implements(ICrawler)

    def __init__(self, master, params={}):
        super(Crawler, self).__init__(master)

    def process(self):
        return self.collect()

    def collect(self, filter=None):
        d = defer.succeed([])
        return d


class SampleCrawler(Crawler):

    def collect(self, filter=None):
        print 'SampleCrawler is collecting.'
        d = succeed([])
        return d

agents.register(SampleCrawler, Master, name='crawl.sample')


class Resource(object):

    implements(IResource)

    data = file = path = None
    type = 'sample'
    contentType = 'text/plain'
    encoding = ''
    application = 'sample'
    metadata = None

    def __init__(self, data=None, **kw):
        if data is not None:
            self.data = data
        for k, v in kw.items():
            setattr(self, k, v)
        self.subResources = []


class Metadata(dict):

    implements(IMetadataSet)

    def __init__(self, data=dict()):
        self.update(data)

    def asXML(self):
        # TODO...
        return ''

    def set(self, key, value):
        self['key'] = value

