from zope.interface import implements from Products.PageTemplates.PageTemplateFile import PageTemplateFile from Persistence import Persistent from App.class_init import default__class_init__ as InitializeClass from Acquisition import Implicit from OFS.SimpleItem import Item from OFS.role import RoleManager from AccessControl import ClassSecurityInfo from Products.CMFCore.permissions import ManagePortal, ManageProperties from Products.CMFCore.utils import getToolByName from Products.PortalTransforms.utils import _www from Products.PortalTransforms.interfaces import IChain from Products.PortalTransforms.interfaces import ITransform from UserList import UserList class chain(UserList): """A chain of transforms used to transform data""" implements(IChain, ITransform) def __init__(self, name='',*args): UserList.__init__(self, *args) self.__name__ = name if args: self._update() def name(self): return self.__name__ def registerTransform(self, transform): self.append(transform) def unregisterTransform(self, name): for i in range(len(self)): tr = self[i] if tr.name() == name: self.pop(i) break else: raise Exception('No transform named %s registered' % name) def convert(self, orig, data, **kwargs): for transform in self: data = transform.convert(orig, data, **kwargs) orig = data.getData() md = data.getMetadata() md['mimetype'] = self.output return data def __setitem__(self, key, value): UserList.__setitem__(self, key, value) self._update() def append(self, value): UserList.append(self, value) self._update() def insert(self, *args): UserList.insert(*args) self._update() def remove(self, *args): UserList.remove(*args) self._update() def pop(self, *args): UserList.pop(*args) self._update() def _update(self): self.inputs = self[0].inputs self.output = self[-1].output for i in range(len(self)): if hasattr(self[-i-1], 'output_encoding'): self.output_encoding = self[-i-1].output_encoding break else: try: del self.output_encoding except: pass class TransformsChain(Implicit, Item, RoleManager, Persistent): """ a transforms chain is suite of transforms to apply in order. It follows the transform API so that a chain is itself a transform. """ module = 'N/A' meta_type = 'TransformsChain' meta_types = all_meta_types = () manage_options = ( ({'label':'Configure', 'action':'manage_main'}, {'label':'Reload', 'action':'manage_reloadTransform'},) + Item.manage_options ) manage_main = PageTemplateFile('editTransformsChain', _www) manage_reloadTransform = PageTemplateFile('reloadTransform', _www) security = ClassSecurityInfo() def __init__(self, id, description, ids=()): self.id = id self.description = description self._object_ids = list(ids) self.inputs = ('application/octet-stream',) self.output = 'application/octet-stream' self._chain = None def _chain_init(self): """ build the transforms chain """ tr_tool = getToolByName(self, 'portal_transforms') self._chain = c = chain() for id in self._object_ids: object = getattr(tr_tool, id) c.registerTransform(object) self.inputs = c.inputs or ('application/octet-stream',) self.output = c.output or 'application/octet-stream' security.declarePublic('convert') def convert(self, *args, **kwargs): """ return apply the transform and return the result """ if self._chain is None: self._chain_init() return self._chain.convert(*args, **kwargs) security.declarePublic('name') def name(self): """return the name of the transform instance""" return self.id security.declarePrivate('manage_beforeDelete') def manage_beforeDelete(self, item, container): Item.manage_beforeDelete(self, item, container) if self is item: # unregister self from catalog on deletion tr_tool = getToolByName(self, 'portal_transforms') tr_tool.unregisterTransform(self.id) security.declareProtected(ManagePortal, 'manage_addObject') def manage_addObject(self, id, REQUEST=None): """ add a new transform or chain to the chain """ assert id not in self._object_ids self._object_ids.append(id) self._chain_init() if REQUEST is not None: REQUEST['RESPONSE'].redirect(self.absolute_url()+'/manage_main') security.declareProtected(ManagePortal, 'manage_delObjects') def manage_delObjects(self, ids, REQUEST=None): """ delete the selected mime types """ for id in ids: self._object_ids.remove(id) self._chain_init() if REQUEST is not None: REQUEST['RESPONSE'].redirect(self.absolute_url()+'/manage_main') # transforms order handling # security.declareProtected(ManagePortal, 'move_object_to_position') def move_object_to_position(self, id, newpos): """ overriden from OrderedFolder to store id instead of objects """ oldpos = self._object_ids.index(id) if (newpos < 0 or newpos == oldpos or newpos >= len(self._object_ids)): return 0 self._object_ids.pop(oldpos) self._object_ids.insert(newpos, id) self._chain_init() return 1 security.declareProtected(ManageProperties, 'move_object_up') def move_object_up(self, id, REQUEST=None): """ move object with the given id up in the list """ newpos = self._object_ids.index(id) - 1 self.move_object_to_position(id, newpos) if REQUEST is not None: REQUEST['RESPONSE'].redirect(self.absolute_url()+'/manage_main') security.declareProtected(ManageProperties, 'move_object_down') def move_object_down(self, id, REQUEST=None): """ move object with the given id down in the list """ newpos = self._object_ids.index(id) + 1 self.move_object_to_position(id, newpos) if REQUEST is not None: REQUEST['RESPONSE'].redirect(self.absolute_url()+'/manage_main') # Z transform interface # security.declareProtected(ManagePortal, 'reload') def reload(self): """ reload the module where the transformation class is defined """ for tr in self.objectValues(): tr.reload() self._chain_init() # utilities # security.declareProtected(ManagePortal, 'listAddableObjectIds') def listAddableObjectIds(self): """ return a list of addable transform """ tr_tool = getToolByName(self, 'portal_transforms') return [id for id in tr_tool.objectIds() if not (id == self.id or id in self._object_ids)] security.declareProtected(ManagePortal, 'objectIds') def objectIds(self): """ return a list of addable transform """ return tuple(self._object_ids) security.declareProtected(ManagePortal, 'objectValues') def objectValues(self): """ return a list of addable transform """ tr_tool = getToolByName(self, 'portal_transforms') return [getattr(tr_tool, id) for id in self.objectIds()] InitializeClass(TransformsChain)