150 lines
5.2 KiB
Python
150 lines
5.2 KiB
Python
from django.utils.translation import ugettext_lazy as _
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from django.utils.translation import ugettext
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from django.core.urlresolvers import reverse
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from django.utils.safestring import mark_safe
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from documents.models import Document
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from metadata.classes import MetadataObject
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from document_indexing.models import Index, IndexInstance
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from document_indexing.conf.settings import AVAILABLE_INDEXING_FUNCTIONS
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from document_indexing.filesystem import fs_create_index_directory
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# External functions
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def update_indexes(document):
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"""
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Update or create all the index instances related to a document
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"""
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warnings = []
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eval_dict = {}
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document_metadata_dict = dict([(metadata.metadata_type.name, metadata.value) for metadata in document.documentmetadata_set.all() if metadata.value])
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eval_dict['document'] = document
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eval_dict['metadata'] = MetadataObject(document_metadata_dict)
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for root in Index.objects.filter(parent=None):
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index_warnings = _evaluate_index(eval_dict, document, root)
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warnings.extend(index_warnings)
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return warnings
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def delete_indexes(document):
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"""
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Delete all the index instances related to a document
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"""
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warnings = []
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for index_instance in document.indexinstance_set.all():
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_remove_document_from_index_instance(document, index_instance)
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return warnings
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def get_instance_link(index_instance=None, text=None, simple=False):
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"""
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Return an HTML anchor to an index instance
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"""
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if simple:
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# Just display the instance's value or overrided text, no
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# HTML anchor
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template = u'%(value)s'
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else:
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template = u'<a href="%(url)s">%(value)s</a>'
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if index_instance:
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return template % {
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'url': index_instance.get_absolute_url(), 'value': text if text else index_instance
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}
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else:
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# Root node
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return template % {
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'url': reverse('index_instance_list'), 'value': ugettext(u'root')
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}
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def get_breadcrumbs(index_instance, simple=False, single_link=False):
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"""
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Return a joined string of HTML anchors to every index instance's
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parent from the root of the tree to the index instance
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"""
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result = []
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if single_link:
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# Return the entire breadcrumb path as a single HTML anchor
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simple = True
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result.append(get_instance_link(simple=simple))
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for instance in index_instance.get_ancestors():
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result.append(get_instance_link(instance, simple=simple))
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result.append(get_instance_link(index_instance, simple=simple))
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if single_link:
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# Return the entire breadcrumb path as a single HTML anchor
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return mark_safe(get_instance_link(index_instance=index_instance, text=(u' / '.join(result))))
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else:
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return mark_safe(u' / '.join(result))
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def do_rebuild_all_indexes():
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IndexInstance.objects.all().delete()
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for document in Document.objects.all():
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update_indexes(document)
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# Internal functions
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def _evaluate_index(eval_dict, document, node, parent_index_instance=None):
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"""
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Evaluate an enabled index expression and update or create all the
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related index instances also recursively calling itself to evaluate
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all the index's children
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"""
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warnings = []
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if node.enabled:
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try:
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result = eval(node.expression, eval_dict, AVAILABLE_INDEXING_FUNCTIONS)
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index_instance, created = IndexInstance.objects.get_or_create(index=node, value=result, parent=parent_index_instance)
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if created:
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fs_create_index_directory(index_instance)
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if node.link_documents:
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index_instance.documents.add(document)
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for children in node.get_children():
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children_warnings = _evaluate_index(eval_dict, document, children, index_instance)
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warnings.extend(children_warnings)
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except (NameError, AttributeError), exc:
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warnings.append(_(u'Error in document indexing update expression: %(expression)s; %(exception)s') % {
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'expression': node.expression, 'exception': exc})
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except Exception, exc:
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warnings.append(_(u'Error updating document index, expression: %(expression)s; %(exception)s') % {
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'expression': node.expression, 'exception': exc})
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return warnings
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def _remove_document_from_index_instance(document, index_instance):
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"""
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Delete a documents reference from an index instance and call itself
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recusively deleting documents and empty index instances up to the
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root of the tree
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"""
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warnings = []
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try:
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index_instance.documents.remove(document)
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if index_instance.documents.count() == 0 and index_instance.get_children().count() == 0:
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# if there are no more documents and no children, delete
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# node and check parent for the same conditions
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parent = index_instance.parent
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index_instance.delete()
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parent_warnings = _remove_document_from_index_instance(document, parent)
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warnings.extend(parent_warnings)
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except Exception, exc:
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warnings.append(_(u'Unable to delete document indexing node; %s') % exc)
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return warnings
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