ab707787fb
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1347 fd906abe-77d9-0310-91a1-e0d9ade77398
286 lines
8.3 KiB
Python
286 lines
8.3 KiB
Python
#
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# Copyright (c) 2005 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Definition of the Concept class.
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$Id$
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"""
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from zope.app import zapi
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from zope.app.container.btree import BTreeContainer
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from zope.app.container.contained import Contained
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from zope.app.file.image import Image
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from zope.app.file.interfaces import IFile
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from zope.app.filerepresentation.interfaces import IReadFile, IWriteFile
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from zope.app.size.interfaces import ISized
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from zope.cachedescriptors.property import Lazy
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from zope.component import adapts
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from zope.i18nmessageid import MessageFactory
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from zope.interface import implements
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from zope import schema
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from persistent import Persistent
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from cStringIO import StringIO
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from zope.app.event.objectevent import ObjectModifiedEvent, Attributes
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from zope.event import notify
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from textindexng.interfaces import IIndexableContent
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from textindexng.content import IndexContentCollector
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from cybertools.relation.registry import getRelations
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from cybertools.relation.interfaces import IRelatable
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from cybertools.typology.interfaces import ITypeManager
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from interfaces import IBaseResource, IResource
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from interfaces import IFile
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from interfaces import IDocument, IDocumentSchema, IDocumentView
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from interfaces import IMediaAsset, IMediaAssetView
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from interfaces import IResourceManager, IResourceManagerContained
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from interfaces import ILoopsContained
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from interfaces import IIndexAttributes
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from concept import ResourceRelation
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from common import ResourceAdapterBase
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from view import TargetRelation
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_ = MessageFactory('loops')
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class Resource(Image, Contained):
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implements(IBaseResource, IResource, IResourceManagerContained, IRelatable, ISized)
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proxyInterface = IMediaAssetView
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_size = _width = _height = 0
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def __init__(self, title=u''):
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super(Resource, self).__init__()
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self.title = title
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def getResourceType(self):
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cm = self.getLoopsRoot().getConceptManager()
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typePred = cm.getTypePredicate()
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if typePred is None:
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return None
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concepts = self.getConcepts([typePred])
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# TODO (?): check for multiple types (->Error)
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return concepts and concepts[0] or cm.get('file', None)
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def setResourceType(self, concept):
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if concept is None:
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return
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current = self.getResourceType()
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if current != concept:
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typePred = self.getLoopsRoot().getConceptManager().getTypePredicate()
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if typePred is None:
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raise ValueError('No type predicate found for '
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+ zapi.getName(self))
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if current is not None:
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self.deassignConcept(current, [typePred])
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self.assignConcept(concept, typePred)
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resourceType = property(getResourceType, setResourceType)
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_title = u''
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def getTitle(self): return self._title
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def setTitle(self, title): self._title = title
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title = property(getTitle, setTitle)
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def _setData(self, data):
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dataFile = StringIO(data) # let File tear it into pieces
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super(Resource, self)._setData(dataFile)
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if not self.contentType:
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self.guessContentType(data)
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data = property(Image._getData, _setData)
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def guessContentType(self, data):
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if not isinstance(data, str): # seems to be a file object
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data = data.read(20)
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if data.startswith('%PDF'):
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self.contentType = 'application/pdf'
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_contentType = u''
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def setContentType(self, contentType):
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if contentType:
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self._contentType = contentType
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def getContentType(self): return self._contentType
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contentType = property(getContentType, setContentType)
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def getLoopsRoot(self):
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return zapi.getParent(self).getLoopsRoot()
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def getClients(self, relationships=None):
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if relationships is None:
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relationships = [TargetRelation]
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rels = getRelations(second=self, relationships=relationships)
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return [r.first for r in rels]
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# concept relations
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def getConceptRelations (self, predicates=None, concept=None):
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predicates = predicates is None and ['*'] or predicates
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relationships = [ResourceRelation(None, self, p) for p in predicates]
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# TODO: sort...
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return getRelations(first=concept, second=self, relationships=relationships)
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def getConcepts(self, predicates=None):
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return [r.first for r in self.getConceptRelations(predicates)]
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def assignConcept(self, concept, predicate=None):
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concept.assignResource(self, predicate)
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def deassignConcept(self, concept, predicates=None):
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concept.deassignResource(self, predicates)
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# ISized interface
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def getSize(self):
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return len(self.data)
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def sizeForSorting(self):
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return 'byte', self.getSize()
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def sizeForDisplay(self):
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return '%i Bytes' % self.getSize()
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class Document(Resource):
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implements(IDocument)
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proxyInterface = IDocumentView
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def __init__(self, title=u''):
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self.title = title
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_data = u''
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def setData(self, data): self._data = data
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def getData(self): return self._data
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data = property(getData, setData)
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class MediaAsset(Resource):
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implements(IMediaAsset)
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class ResourceManager(BTreeContainer):
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implements(IResourceManager, ILoopsContained)
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def getLoopsRoot(self):
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return zapi.getParent(self)
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def getViewManager(self):
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return self.getLoopsRoot().getViewManager()
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# adapters and similar stuff
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class FileAdapter(ResourceAdapterBase):
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""" A type adapter for providing file functionality for resources.
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"""
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implements(IFile)
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class DocumentWriteFileAdapter(object):
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implements(IWriteFile)
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adapts(IDocument)
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def __init__(self, context):
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self.context = context
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def write(self, data):
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self.context.data = unicode(data.replace('\r', ''), 'UTF-8')
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notify(ObjectModifiedEvent(self.context, Attributes(IDocument, 'data')))
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class DocumentReadFileAdapter(object):
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implements(IReadFile)
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adapts(IDocument)
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def __init__(self, context):
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self.context = context
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def read(self):
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return self.context.data.encode('UTF-8')
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def size(self):
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return len(self.context.data)
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class IndexAttributes(object):
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implements(IIndexAttributes)
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adapts(IResource)
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def __init__(self, context):
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self.context = context
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def text(self):
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context = self.context
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if not context.contentType.startswith('text'):
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return ''
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data = context.data
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# TODO: transform to plain text
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#return ' '.join((zapi.getName(context), context.title, data)).strip()
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return data
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def title(self):
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context = self.context
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return ' '.join((zapi.getName(context), context.title,)).strip()
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class IndexableResource(object):
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""" Used for TextIndexNG - obsolete.
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"""
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implements(IIndexableContent)
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adapts(IResource)
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def __init__(self, context):
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self.context = context
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def indexableContent(self, fields):
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context = self.context
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icc = IndexContentCollector()
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icc.addBinary(fields[0], context.data, context.contentType, language='de')
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return icc
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class ResourceTypeSourceList(object):
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implements(schema.interfaces.IIterableSource)
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def __init__(self, context):
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self.context = context
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def __iter__(self):
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return iter(self.resourceTypes)
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@Lazy
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def resourceTypes(self):
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types = ITypeManager(self.context).listTypes(include=('resource',))
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return [t.typeProvider for t in types if t.typeProvider is not None]
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def __len__(self):
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return len(self.resourceTypes)
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