source: main/waeup.sirp/trunk/src/waeup/sirp/university/catalog.py @ 6207

"""Catalog and searching components for academics stuff.
"""
import grok
from hurry.query import Eq
from zope.catalog.interfaces import ICatalog
from zope.component import getUtility
from zope.component.interfaces import ComponentLookupError
from zope.intid import IIntIds
from waeup.sirp.interfaces import IUniversity
from waeup.sirp.catalog import QueryResultItem
from waeup.sirp.university.interfaces import (
    ICourse, ICertificateCourse, IDepartment,
    )

class CourseIndexes(grok.Indexes):
    grok.site(IUniversity)
    grok.name('courses_catalog')
    grok.context(ICourse)

    code = grok.index.Field(attribute='code')
    title = grok.index.Text(attribute='title')

class CourseCertificatesIndexes(grok.Indexes):
    grok.site(IUniversity)
    grok.name('certcourses_catalog')
    grok.context(ICertificateCourse)

    course_code = grok.index.Field(attribute='getCourseCode')

@grok.subscribe(ICourse, grok.IObjectAddedEvent)
def handleCourseAdd(obj, event):
    """Index an added course with the local catalog.

    Courses are not indexed automatically, as they are not a
    dictionary subitem of the accompanied site object
    (`IUniversity`). I.e. one cannot get them by asking for
    ``app['FACCODE']['DEPTCODE']['COURSECODE']`` but one has to ask for
    ``app.faculties['FACCODE']['DEPTCODE'].courses['COURSECODE']``.

    Once, a course is indexed we can leave the further handling to
    the default component architechture. At least removals will
    be handled correctly then (and the course unindexed).
    """
    try:
        cat = getUtility(ICatalog, name='courses_catalog')
    except ComponentLookupError:
        # catalog not available. This might happen during tests.
        return
    intids = getUtility(IIntIds)
    index = cat['code']
    index.index_doc(intids.getId(obj), obj)

@grok.subscribe(IDepartment, grok.IObjectRemovedEvent)
def handleDepartmentRemoval(obj, event):
    """Clear courses and certificates when a department is killed.
    """
    obj.courses.clear()
    obj.certificates.clear()
    return

class CourseQueryResultItem(QueryResultItem):
    def __init__(self, context, view):
        self.context = context
        self.url = view.url(context)
        self.title = "COURSE: " + context.title
        self.description = 'code: %s' % context.code

def search(query=None, view=None):
    if not query:
        return []
    cat = getUtility(ICatalog, name='courses_catalog')
    results = list(cat.searchResults(code=(query, query)))

    hitlist = []
    results = Query().searchResults(
        Eq(('courses_catalog', 'code'), query))
    for result in results:
        hitlist.append(CourseQueryResultItem(result, view=view))

    results = Query().searchResults(
        Text(('courses_catalog', 'title'), query))

    for result in results:
        hitlist.append(CourseQueryResultItem(result, view=view))

    return hitlist