work in progress: new data table concept type

table.py

@@ -0,0 +1,89 @@
+#
+#  Copyright (c) 2011 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
+#
+
+"""
+Data (keyword-based) table definition and implementation.
+
+$Id$
+"""
+
+from BTrees.OOBTree import OOBTree
+from zope import schema, component
+from zope.interface import Interface, Attribute, implements
+from zope.cachedescriptors.property import Lazy
+
+from cybertools.composer.schema.grid.interfaces import Records
+from loops.common import AdapterBase
+from loops.interfaces import IConcept, IConceptSchema, ILoopsAdapter
+from loops.type import TypeInterfaceSourceList
+from loops import util
+from loops.util import _
+
+
+class IDataTable(IConceptSchema, ILoopsAdapter):
+    """ The schema for the data table type.
+    """
+
+    viewName = schema.TextLine(
+        title=_(u'Adapter/View name'),
+        description=_(u'Optional name of the view '
+                      u'to be used for presenting '
+                      u'the data of the table.'),
+        default=u'',
+        required=False)
+
+    # better: specify column names (and possibly labels, types)
+    # in Python code and reference by name here
+    columns = schema.List(
+        title=_(u'Columns'),
+        description=_(u'The names of the columns of the data table. '
+                      u'The first name is the name of the key column.'),
+        value_type=schema.BytesLine(),
+        default=['key', 'value'],
+        required=True)
+
+    data = Records(title=_(u'Table Data'),
+        description=_(u'Table Data'),
+        required=False)
+
+
+class DataTable(AdapterBase):
+
+    implements(IDataTable)
+
+    _contextAttributes = list(IDataTable)
+    _adapterAttributes = AdapterBase._adapterAttributes + ('columns', 'data')
+
+    def getColumns(self):
+        return getattr(self.context, '_columns', ['key', 'value'])
+    def setColumns(self, value):
+        self.context._columns = value
+    columns = property(getColumns, setColumns)
+
+    def getData(self):
+        data = getattr(self.context, '_data', None)
+        if data is None:
+            data = OOBTree()
+            self.context._data = data
+        return data
+    def setData(self, data):
+        self.context._data = OOBTree(data)
+    data = property(getData, setData)
+
+
+TypeInterfaceSourceList.typeInterfaces += (IDataTable,)