entities/schemaobjs.py
author Julien Cristau <julien.cristau@logilab.fr>
Wed, 02 Apr 2014 12:38:29 +0200
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""schema definition related entities"""
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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import cached
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from yams.schema import role_name
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from cubicweb import ValidationError
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from cubicweb.schema import ERQLExpression, RRQLExpression
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from cubicweb.entities import AnyEntity, fetch_config
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class CWEType(AnyEntity):
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    __regid__ = 'CWEType'
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    fetch_attrs, cw_fetch_order = fetch_config(['name'])
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    def dc_title(self):
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        return u'%s (%s)' % (self.name, self._cw._(self.name))
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    def dc_long_title(self):
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        stereotypes = []
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        _ = self._cw._
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        if self.final:
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            stereotypes.append(_('final'))
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        if stereotypes:
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            return u'%s <<%s>>' % (self.dc_title(), ', '.join(stereotypes))
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        return self.dc_title()
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class CWRType(AnyEntity):
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    __regid__ = 'CWRType'
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    fetch_attrs, cw_fetch_order = fetch_config(['name'])
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    def dc_title(self):
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        return u'%s (%s)' % (self.name, self._cw._(self.name))
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    def dc_long_title(self):
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        stereotypes = []
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        _ = self._cw._
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        if self.symmetric:
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            stereotypes.append(_('symmetric'))
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        if self.inlined:
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            stereotypes.append(_('inlined'))
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        if self.final:
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            stereotypes.append(_('final'))
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        if stereotypes:
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            return u'%s <<%s>>' % (self.dc_title(), ', '.join(stereotypes))
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        return self.dc_title()
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    def check_inlined_allowed(self):
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        """check inlining is possible, raise ValidationError if not possible
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        """
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        # don't use the persistent schema, we may miss cardinality changes
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        # in the same transaction
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        for rdef in self.reverse_relation_type:
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            card = rdef.cardinality[0]
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            if not card in '?1':
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                qname = role_name('inlined', 'subject')
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                rtype = self.name
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                stype = rdef.stype
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                otype = rdef.otype
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                msg = self._cw._("can't set inlined=True, "
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                                 "%(stype)s %(rtype)s %(otype)s "
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                                 "has cardinality=%(card)s")
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                raise ValidationError(self.eid, {qname: msg % locals()})
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class CWRelation(AnyEntity):
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    __regid__ = 'CWRelation'
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    fetch_attrs = fetch_config(['cardinality'])[0]
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    def dc_title(self):
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        return u'%s %s %s' % (
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            self.from_entity[0].name,
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            self.relation_type[0].name,
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            self.to_entity[0].name)
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    def dc_long_title(self):
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        card = self.cardinality
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        scard, ocard = u'', u''
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        if card[0] != '1':
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            scard = '[%s]' % card[0]
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        if card[1] != '1':
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            ocard = '[%s]' % card[1]
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        return u'%s %s%s%s %s' % (
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            self.from_entity[0].name,
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            scard, self.relation_type[0].name, ocard,
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            self.to_entity[0].name)
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    @property
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    def rtype(self):
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        return self.relation_type[0]
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    @property
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    def stype(self):
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        return self.from_entity[0]
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    @property
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    def otype(self):
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        return self.to_entity[0]
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    def yams_schema(self):
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        rschema = self._cw.vreg.schema.rschema(self.rtype.name)
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        return rschema.rdefs[(self.stype.name, self.otype.name)]
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class CWAttribute(CWRelation):
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    __regid__ = 'CWAttribute'
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    def dc_long_title(self):
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        card = self.cardinality
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        scard = u''
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        if card[0] == '1':
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            scard = '+'
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        return u'%s %s%s %s' % (
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            self.from_entity[0].name,
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            scard, self.relation_type[0].name,
0
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            self.to_entity[0].name)
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class CWConstraint(AnyEntity):
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    __regid__ = 'CWConstraint'
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    fetch_attrs, cw_fetch_order = fetch_config(['value'])
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    def dc_title(self):
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        return '%s(%s)' % (self.cstrtype[0].name, self.value or u'')
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    @property
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    def type(self):
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        return self.cstrtype[0].name
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class RQLExpression(AnyEntity):
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    __regid__ = 'RQLExpression'
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    fetch_attrs, cw_fetch_order = fetch_config(['exprtype', 'mainvars', 'expression'])
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    def dc_title(self):
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        return self.expression or u''
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    def dc_long_title(self):
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        return '%s(%s)' % (self.exprtype, self.expression or u'')
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    @property
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    def expression_of(self):
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        for rel in ('read_permission', 'add_permission', 'delete_permission',
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                    'update_permission', 'condition'):
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            values = getattr(self, 'reverse_%s' % rel)
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            if values:
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                return values[0]
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    @cached
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    def _rqlexpr(self):
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        if self.exprtype == 'ERQLExpression':
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            return ERQLExpression(self.expression, self.mainvars, self.eid)
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        #if self.exprtype == 'RRQLExpression':
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        return RRQLExpression(self.expression, self.mainvars, self.eid)
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    def check_expression(self, *args, **kwargs):
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        return self._rqlexpr().check(*args, **kwargs)