source: waeup/branches/ulif-rewrite/src/waeup/university/facultycontainer.py @ 4279

import sys
import grok
from zope.component import getUtility
from zope.component.factory import Factory
from zope.component.interfaces import Invalid, IFactory
from zope.component import createObject
from zope.exceptions import DuplicationError
from zope.interface import implementedBy
from waeup.csvfile import CSVFile
from waeup.csvfile.interfaces import ICSVFile
from waeup.interfaces import IFacultyContainer, IFaculty, IWAeUPCSVImporter
from waeup.utils.importexport import CSVImporter
from waeup.viewlets import (MainArea, LeftSidebar, Index, Add, Manage,
                            FormWrapMixin)


class FacultyContainer(grok.Container):
    """See interfaces for description.
    """
    grok.implements(IFacultyContainer)
    grok.require('waeup.manageUniversity')

    def addFaculty(self, faculty):
        if not IFaculty.providedBy(faculty):
            raise TypeError('FacultyContainers contain only IFaculty instances')
        self[faculty.code] = faculty
        return

    def clear(self):
        keys = self.keys()
        for key in keys:
            del self[key]

class FacultyContainerFactory(grok.GlobalUtility):
    """A factory for faculty containers.
    """
    grok.implements(IFactory)
    grok.name(u'waeup.FacultyContainer')
    title = u"Create a new faculty container.",
    description = u"This factory instantiates new faculty containers."

    def __call__(self):
        return FacultyContainer()

    def getInterfaces(self):
        return implementedBy(FacultyContainer)


#
# CSV import stuff
#
class IFacultyCSVFile(ICSVFile):
    """A CSV file that contains faculty data.
    """

class FacultyCSVFile(CSVFile):
    """An abstraction of a CSV file containing faculties.
    """
    grok.implements(IFacultyCSVFile)
    grok.provides(IFacultyCSVFile)
    required_fields = ['code', 'title', 'title_prefix']

class FacultyCSVImporter(CSVImporter):
    """Shuffle data from faculty CSV files into faculty containers.
    """
    # Tell, what kinds of objects we connect...
    grok.adapts(IFacultyCSVFile, IFacultyContainer)
    # Tell the world, that we are an importer...
    grok.implements(IWAeUPCSVImporter)
    grok.provides(IWAeUPCSVImporter)

    datatype = u'Faculty Importer'

    def doImport(self, clear_old_data=True, overwrite=True):
        # CSVImporter instances have a `csvfile` and a `receiver`
        # object defined which refer to the CSV file and the container.
        for row in self.csvfile.getData():
            new_item = createObject(u'waeup.Faculty')
            for key, val in row.items():
                setattr(new_item, key, val)
            self.receiver.addFaculty(new_item)
        return

class IDepartmentCSVFile(ICSVFile):
    """A CSV file that contains department data.
    """

class DepartmentCSVFile(CSVFile):
    """An abstraction of a CSV file containing departments.
    """
    grok.implements(IDepartmentCSVFile)
    grok.provides(IDepartmentCSVFile)
    required_fields = ['code', 'title', 'title_prefix', 'faculty_code']

class DepartmentCSVImporter(CSVImporter):
    """Shuffle data from department CSV files into faculty containers.
    """
    # Tell, what kinds of objects we connect...
    grok.adapts(IDepartmentCSVFile, IFacultyContainer)
    # Tell the world, that we are an importer...
    grok.implements(IWAeUPCSVImporter)
    grok.provides(IWAeUPCSVImporter)

    datatype = u'Department Importer'

    def doImport(self, clear_old_data=True, overwrite=True):
        # CSVImporter instances have a `csvfile` and a `receiver`
        # object defined which refer to the CSV file and the container.
        for row in self.csvfile.getData():
            new_item = createObject(u'waeup.Department')
            faculty_code = row['faculty_code']
            faculty = self.receiver[faculty_code]
            del row['faculty_code']
            for key, val in row.items():
                setattr(new_item, key, val)
            faculty.addDepartment(new_item)
        return

class ICourseCSVFile(ICSVFile):
    """A CSV file that contains course data.
    """

class CourseCSVFile(CSVFile):
    """An abstraction of a CSV file containing courses.
    """
    grok.implements(ICourseCSVFile)
    grok.provides(ICourseCSVFile)
    required_fields = ['code', 'title', 'level', 'passmark', 'credits',
                       'semester', 'faculty', 'department']

class CourseCSVImporter(CSVImporter):
    """Shuffle data from course CSV files into faculty containers.
    """
    # Tell, what kinds of objects we connect...
    grok.adapts(ICourseCSVFile, IFacultyContainer)
    # Tell the world, that we are an importer...
    grok.implements(IWAeUPCSVImporter)
    grok.provides(IWAeUPCSVImporter)

    datatype = u'Course Importer'

    def doImport(self, clear_old_data=True, overwrite=True):
        # CSVImporter instances have a `csvfile` and a `receiver`
        # object defined which refer to the CSV file and the container.
        for row in self.csvfile.getData():

            new_item = createObject(u'waeup.Course')
            
            faculty_code = row['faculty']
            faculty = self.receiver[faculty_code]
            del row['faculty']

            dept_code = row['department']
            dept = faculty[dept_code]
            del row['department']

            for key, val in row.items():
                setattr(new_item, key, val)
            dept.courses.addCourse(new_item)
        return



#
# Viewing / Layout stuff...
#
class Content(grok.Viewlet):
    grok.viewletmanager(MainArea)
    grok.context(IFacultyContainer)
    grok.view(Index)

    def getFaculties(self):
        """Convinience method to create a sorted list of faculties.

        It provides a list of dicts with entries for all data needed by
        usual list templates.
        """
        result = []
        for key, val in self.context.items():
            result.append(dict(id=key, name=val.title))
        return result

class ManageFacultyContainer(grok.Viewlet):
    grok.viewletmanager(MainArea)
    grok.context(IFacultyContainer)
    grok.view(Manage)
    grok.template('manage')    

    def update(self):
        form = self.request.form
        if 'CANCEL' in form.keys():
            self.view.redirect(self.view.url(self.context))
        if not 'DELETE' in form.keys():
            return
        fac_id = form['fac_id']
        if not isinstance(fac_id, list):
            fac_id = [fac_id]
        deleted = []
        for id in fac_id:
            try:
                del self.context[id]
                deleted.append(id)
            except:
                self.view.flash('Could not delete %s: %s: %s' % (
                        id, sys.exc_info()[0], sys.exc_info()[1]))
        if len(deleted):
            self.view.flash('Successfully deleted: %s' % ', '.join(deleted))
        # We have to redirect to let flash messages appear immediately...
        self.view.redirect(self.view.url())
        return
        
class AddFacultyForm(grok.AddForm):
    grok.context(IFacultyContainer)
    form_fields = grok.AutoFields(IFaculty)
    label = 'Add a faculty'

    @grok.action('Add faculty')
    def addFaculty(self, **data):
        faculty = createObject(u'waeup.Faculty')
        self.applyData(faculty, **data)
        try:
            self.context.addFaculty(faculty)
        except DuplicationError:
            self.status = Invalid('The name chosen already exists '
                                  'in the database')
            return
        self.redirect(self.url(self.context))

        
class AddFaculty(FormWrapMixin, grok.Viewlet):
    """A viewlet that wraps the `AddFacultyForm`.
    """
    grok.viewletmanager(MainArea)
    grok.context(IFacultyContainer)
    grok.view(Add)
    grok.require('waeup.manageUniversity')

    formview_name = 'addfacultyform' # The name of the formview we
                                     # want to be rendered in this
                                     # viewlet.


class AddFacultyLink(grok.Viewlet):
    """A link in the left sidebar displaying 'Add faculty'
    """
    grok.viewletmanager(LeftSidebar)
    grok.context(IFacultyContainer)
    grok.view(Index)
    grok.order(5)
    # This is so cool! This link is only displayed, when the user is
    # allowed to use it!
    grok.require('waeup.manageUniversity')
    
    def render(self):
        return u'<div class="portlet"><a href="add">Add faculty</a></div>'

class ManageFacultyLink(grok.Viewlet):
    """A link in the left sidebar displaying 'Manage faculty'
    """
    grok.viewletmanager(LeftSidebar)
    grok.context(IFacultyContainer)
    grok.view(Index)
    grok.order(5)
    grok.require('waeup.manageUniversity')
    
    def render(self):
        return u'<div class="portlet"><a href="manage">Manage faculties</a></div>'