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##############################################################################
#
# Copyright (c) 2009 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Resource interfaces
"""
from zope.interface import Interface, Attribute


class IResource(Interface):

    request = Attribute('Request object that is requesting the resource')

    def __call__():
        """return the absolute URL of this resource."""

class IFileResource(IResource):
    pass

class IResourceFactory(Interface):

    def __call__(request):
        """Return an IResource object"""

class IResourceFactoryFactory(Interface):
    """A factory for IResourceFactory objects

    These factories are registered as named utilities that can be selected
    for creating resource factories in a pluggable way.

    Resource directories and browser:resource directive use these utilities
    to choose what resource to create, depending on the file extension, so
    third-party packages could easily plug-in additional resource types.

    """

    def __call__(path, checker, name):
        """Return an IResourceFactory"""

class IETag(Interface):
    """An adapter for computing resource ETags."""

    def __call__(mtime, content):
        """Compute an ETag for a resource.

        May return None to disable the ETag header.
        """