loops/browser/concept.py

#
#  Copyright (c) 2004 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
#

"""
Definition of the Task view class.

$Id$
"""

from zope.app import zapi
from zope.app.catalog.interfaces import ICatalog
from zope.app.dublincore.interfaces import ICMFDublinCore
from zope.app.event.objectevent import ObjectCreatedEvent
from zope.app.form.browser.interfaces import ITerms
from zope.cachedescriptors.property import Lazy
from zope.event import notify
from zope.interface import implements
from zope.publisher.interfaces import BadRequest
from zope import schema
from zope.security.proxy import removeSecurityProxy
from loops.concept import Concept
from loops.browser.common import BaseView, LoopsTerms


class ConceptView(BaseView):

    def children(self):
        for r in self.context.getChildRelations():
            yield ConceptRelationView(r, self.request, contextIsSecond=True)

    def parents(self):
        for r in self.context.getParentRelations():
            yield ConceptRelationView(r, self.request)
        #rels = self.context.getParentRelations()
        #result = []
        #for r in rels:
        #    p = r.first
            #if p is None:  # this should not be necessary
            #    print 'Warning: parents() got a None first on', \
            #            zapi.getName(self.context), zapi.getName(r.predicate)
            #    continue
        #    p.predicate = r.predicate
        #return result and self.viewIterator(result) or []

    def viewIterator(self, objs):
        request = self.request
        for o in objs:
            yield ConceptView(o, request)

    def update(self):
        action = self.request.get('action')
        if action is None:
            return True
        if action == 'create':
            self.createAndAssign()
            return True
        tokens = self.request.get('tokens', [])
        for token in tokens:
            parts = token.split(':')
            token = parts[0]
            if len(parts) > 1:
                relToken = parts[1]
            concept = self.loopsRoot.loopsTraverse(token)
            if action == 'assign':
                assignAs = self.request.get('assignAs', 'child')
                if assignAs == 'child':
                    self.context.assignChild(removeSecurityProxy(concept))
                elif assignAs == 'parent':
                    self.context.assignParent(removeSecurityProxy(concept))
                else:
                    raise(BadRequest, 'Illegal assignAs parameter: %s.' % assignAs)
            elif action == 'remove':
                predicate = self.loopsRoot.loopsTraverse(relToken)
                qualifier = self.request.get('qualifier')
                if qualifier == 'parents':
                    self.context.deassignParents(concept, [predicate])
                elif qualifier == 'children':
                    self.context.deassignChildren(concept, [predicate])
                else:
                    raise(BadRequest, 'Illegal qualifier: %s.' % qualifier)
            else:
                    raise(BadRequest, 'Illegal action: %s.' % action)
        return True

    def createAndAssign(self):
        request = self.request
        name = request.get('create.name')
        if not name:
            raise(BadRequest, 'Empty name.')
        title = request.get('create.title', u'')
        type = request.get('create.type')
        concept = Concept(title)
        container = self.loopsRoot.getConceptManager()
        container[name] = concept
        # TODO: notify ObjectCreatedEvent() (?)
        #notify(ObjectCreatedEvent(removeSecurityProxy(concept)))
        assignAs = self.request.get('assignAs', 'child')
        if assignAs == 'child':
            self.context.assignChild(removeSecurityProxy(concept))
        elif assignAs == 'parent':
            self.context.assignParent(removeSecurityProxy(concept))
        else:
            raise(BadRequest, 'Illegal assignAs parameter: %s.' % assignAs)

    def search(self):
        request = self.request
        if request.get('action') != 'search':
            return []
        searchTerm = request.get('searchTerm', None)
        if searchTerm:
            cat = zapi.getUtility(ICatalog)
            result = cat.searchResults(loops_searchableText=searchTerm)
        else:
            result = self.loopsRoot.getConceptManager().values()
        return self.viewIterator(result)


class ConceptRelationView(object):

    def __init__(self, relation, request, contextIsSecond=False):
        if contextIsSecond:
            self.context = relation.second
            self.other = relation.first
        else:
            self.context = relation.first
            self.other = relation.second
        self.predicate = relation.predicate
        self.conceptType = self.context.conceptType
        self.request = request

    @Lazy
    def loopsRoot(self):
        return self.context.getLoopsRoot()

    @Lazy
    def url(self):
        return zapi.absoluteURL(self.context, self.request)

    @Lazy
    def title(self):
        return self.context.title
    
    @Lazy
    def token(self):
        return ':'.join((self.loopsRoot.getLoopsUri(self.context),
                         self.loopsRoot.getLoopsUri(self.predicate)))

    @Lazy
    def typeTitle(self):
        return self.conceptType.title

    @Lazy
    def typeUrl(self):
        return zapi.absoluteURL(self.conceptType, self.request)

    @Lazy
    def predicateTitle(self):
        return self.predicate.title

    @Lazy
    def predicateUrl(self):
        return zapi.absoluteURL(self.predicate, self.request)