7c8fbb6532
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1237 fd906abe-77d9-0310-91a1-e0d9ade77398
126 lines
4 KiB
Python
126 lines
4 KiB
Python
#
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# Copyright (c) 2006 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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interface definitions for the reporter package.
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$Id$
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"""
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import zope
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from zope.interface import Interface, Attribute
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# iterable stuff for batching, sorting, filtering of results
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class IBatch(Interface):
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""" Represents a part (sort of a slice) of an iterable.
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"""
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iterable = Attribute(u'The iterable this batch belongs to')
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start = Attribute(u'The current start index of the batch in the parent iterable')
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def __getitem__(idx):
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""" Return the item at index idx on the current page.
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"""
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def next():
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""" Return the next item on the current page. Raise StopIteration if
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the end of the batch is reached.
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"""
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def __len__():
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""" Return the number of items on the current page.
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"""
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def getIndexRelative(relativePageNumber):
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""" Return the absolute page index based on the current page of
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the batch object.
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Using +1 or -1 retrieves the next or previous batch.
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If a page before the first one is addressed return 0,
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if a page after the last one is addressed return the index
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of the last page.
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"""
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def getIndexAbsolute(pageNumber):
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""" Return the absolute page index.
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0 addresses the first batch page, -1 the last.
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Return None if the corresponding page does not exist.
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"""
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# result sets, rows, cells...
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class IResultSet(Interface):
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"""A sequence of rows provided by a data source, report or
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similar object, together with a schema that describes the columns
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(fields, cells).
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"""
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schema = zope.schema.Iterable(title=u'Schema',
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description=u'Collection of field specifications based '
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'on the interfaces defined by zope.schema.')
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rows = zope.schema.Iterable(title=u'Rows',
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description=u'Sequence of row objects')
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class IRow(Interface):
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""" A sequence of cells containing the real data objects.
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"""
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cells = zope.schema.Dict(zope.schema.ASCIILine(),
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title=u'Cells',
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description=u'Mapping of data elements addressed by a name '
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'that is the key to the mapping.')
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resultSet = Attribute('The result set this row belongs to.')
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class ICell(Interface):
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""" A single cell of a listing or table.
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"""
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text = zope.schema.Text(title=u'Text',
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description=u'Text to be displayed')
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value = zope.schema.Object(Interface,
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title=u'Value',
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description=u'The real object, often identical to text.')
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token = zope.schema.ASCIILine(title=u'Token',
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description=u'May be used to identify a cell within'
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'the result set, e.g. in forms')
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row = Attribute('The row this cell belongs to.')
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def sortKey():
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""" Returns a value (typically a string or a sequence) that will
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be used for comparing cells in order to sort rows.
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"""
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# data source
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class IDataSource(Interface):
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""" An iterable that may be used as a data source.
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"""
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def __iter__():
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""" Return an iterable that provides the data to be evaluated.
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"""
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