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• Listing available COM Objects with Powershell

  - by outtacontrol

  I am currently using the following script to list the available COM Objects on my machine. $path = "REGISTRY::HKEY_CLASSES_ROOT\CLSID\*\PROGID" foreach ($obj in dir $path) { write-host $obj.GetValue("") } I read on another website that the existence of the InProcServer32 key is evidence that the object is 64 bit compatible. So using powershell how can I determine the existence of InProcServer32 for each COM Object? If that is even the correct way of establishing whether it is 32 bit or 64 bit.

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• ASP.net Create Self re-caching objects?

  - by BlackTea

  How can i make a cached object re-cache it self with updated info when the cache has expired? I'm trying to prevent the next user who request the cache to have to deal with getting the data setting the cache then using it is there any background method/event i can tie the object to so that when it expires it just calls the method it self and self-caches.

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• Javascript objects: get parent

  - by Dänu

  Hey Guys I got some question about nested javascript objects (is it me, google or is javascript quite poorly documented?). Now, I got the following (nested) object: obj: { subObj: { 'hello world' } }; next thing I do is to reference the subobject like this: var s = obj.subObj; now what I would like to do, is to get a reference to the object obj out of the variable s. Something like: var o = s.parent; Is this somehow possible?

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• Where about should my main class be created in a project?

  - by Dan

  The problem is where a class should be created in my code. An example is I have a UI class and a main logic class that controls other objects. Should the main logic class create the UI object, or should the UI object create the instance of the main logic class? An explanation of which method is best and why would be ideal. Thanks.

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• Does Javascript have classes?

  - by Glycerine

  A friend and I had an argument last week. He stated there were no such things as classes in Javascript. I said there was as you can say var object = new Object() he says "as there is no word class used. Its not a class. -- Whats your take on it guys? thanks.

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• Objects With No Behavior

  - by Patrick Donovan

  I've been teaching myself object oriented programming and I'm thinking about a situation where I have an object "Transaction", that has quite a few properties to it like account, amount, date, currency, type, etc. I never plan to mutate these data points, and calculation logic will live in other classes. My question is, is it poor Python design to instantiate thousands of objects just to hold data? I find the data far easier to work with embedded in a class rather than trying to cram it into some combination of data structures.

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• Versant OQL Statement with an Arithmetic operator

  - by Pascal

  I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example. I'm trying to build something like this: SELECT * FROM _orderItemObject WHERE _qtyOrdered - _qtySent > 0 If I try this statement in the Object Inspector I get a synthax error near the '-'. Anyone has an example of a working VQL with that kind of statement? Thanks

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• Javascript (JSON) Objects: Get Parent

  - by Dänu

  Hey Guys I got some question about nested javascript objects (is it me, google or is javascript quite poorly documented?). Now, I got the following (nested) object: obj: { subObj: { 'hello world' } }; next thing I do is to reference the subobject like this: var s = obj.subObj; now what I would like to do, is to get a reference to the object obj out of the variable s. Something like: var o = s.parent; Is this somehow possible?

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• java objects, shared variables

  - by raven

  hello, I have a simple question here. If I declare a variable inside an object which was made [declared] in the main class, like this: public static int number; ( usually I declare it like this : private int number; ) can it be used in a different object which was also made [declared] in the main class? btw I do not care about security atm, I just want to make something work, don't care about protection)

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• How do I define my own operators in the Io programming language?

  - by klep

  I'm trying to define my own operator in Io, and I'm having a hard time. I have an object: MyObject := Object clone do( lst := list() !! := method(n, lst at(n)) ) But when I call it, like this: x := MyObject clone do(lst appendSeq(list(1, 2, 3))) x !! 2 But I get an exception that argument 0 to at must not be nil. How can I fix?

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• Do Java or C++ lack any OO features?

  - by tsv

  I am interested in understanding object-oriented programming in a more academic and abstract way than I currently do, and want to know if there are any object-oriented concepts Java and C++ fail to implement. I realise neither of the languages are "pure" OO, but I am interested in what (if anything) they lack, not what they have extra.

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• image processing problem

  - by riyana

  i'm working on detecting shape of any object.i've a binary image where background is white pixels and foreground/object is black pixel. now i need to detect the shape of the area where there are black pixels.how can i do it?the shape may be of a man/car/box etc. plz help

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• Access specifier's and classes and objects?

  - by TimothyTech

  Alright, im trying to understand this, so a class is simply creating a template for an object. class Bow { int arrows; }; and an object is simply creating a specific item using the class template. Bow::Bow(arrows) { arrows = 20; } also another question, public specifiers are used to make data members avaible in objects and private specifiers are used to make data memebers only avaialble inside the class?

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• Is there a factory pattern to prevent multiple instances for same object (instance that is Equal) good design?

  - by dsollen

  I have a number of objects storing state. There are essentially two types of fields. The ones that uniquely define what the object is (what node, what edge etc), and the others that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methods, so all these objects act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approach which accepts a Builder object and constructs the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquely defines the type of object (this is node A to node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows its state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overriding of serialization methods to make it work (ensure that when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in its place), as well as using a weakHashMap as if it was a weakHashSet to know whether an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to its own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state that is different than my memory; to tell my memory when its own state is inconsistent. I believe this is possible despite their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect that I'm posting).

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• is a factory pattern to prevent multuple instances for same object (instance that is Equal) good design?

  - by dsollen

  I have a number of objects storing state. There are essentially two types of fields. The ones that uniquly define what the object is (what node, what edge etc), and the oens that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methdos, so these objects all act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approch which accepts a Builder object and construct the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquly defines the type of object (this is node A nto node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows it's state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overiding of serlization methods to make it work (ensure when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in it's place), as well as using a weakHashMap as if it was a weakHashSet to know rather an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to it's own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state taht is different then my memory; to tell my memory when it's own state is inconsistent. I believe this is possible despit their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect I'm posting).

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• In dependency injection, is there a simple name for the counterpart of the injected object?

  - by kostja

  In tutorials and books, I have never seen a single word describing the object that the injected object is injected into. Instead, other terms are used, like "injection point" which don't denote the object containing the injected object. And nothing I can think of sounds right, except maybe "injection target" - but I have never read it anywhere. Is there a single word or a simple expression for it, or is it like the "He-Who-Must-Not-Be-Named" from a recent fantasy book series?

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• Plone: Creating new Page fails "AttributeError: 'str' object has no attribute 'dates'"

  - by paskster

  I just installed Plone on my Centos 5.5. I was able login via the admin-account and create new users. But when I try to create a new page I get the following error message: Traceback (innermost last): Module ZPublisher.Publish, line 127, in publish Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 47, in call_object Module Products.CMFPlone.FactoryTool, line 446, in __call__ Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 47, in call_object Module Products.CMFFormController.FSControllerPageTemplate, line 91, in __call__ Module Products.CMFFormController.BaseControllerPageTemplate, line 31, in _call Module Shared.DC.Scripts.Bindings, line 324, in __call__ Module Shared.DC.Scripts.Bindings, line 361, in _bindAndExec Module Products.CMFCore.FSPageTemplate, line 240, in _exec Module Products.CMFCore.FSPageTemplate, line 180, in pt_render Module Products.PageTemplates.PageTemplate, line 80, in pt_render Module zope.pagetemplate.pagetemplate, line 113, in pt_render Warning: Macro expansion failed Warning: <type 'exceptions.KeyError'>: 'macro' Module zope.tal.talinterpreter, line 271, in __call__ Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 954, in do_defineSlot Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 858, in do_defineMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 954, in do_defineSlot Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 946, in do_defineSlot Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 858, in do_defineMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 852, in do_condition Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 954, in do_defineSlot Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 852, in do_condition Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 821, in do_loop_tal Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 522, in do_optTag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 821, in do_loop_tal Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 852, in do_condition Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 852, in do_condition Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 946, in do_defineSlot Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 888, in do_useMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 583, in do_setLocal_tal Module zope.tales.tales, line 696, in evaluate URL: file:/usr/local/Plone/buildout-cache/eggs/Plone-4.0.2-py2.6.egg/Products/CMFPlone/skins/plone_templates/calendar_macros.pt Line 12, Column 4 Expression: <PythonExpr date_components_support_view.result(inputvalue, 0, starting_year, ending_year, future_years)> Names: {'container': <PloneSite at /reeple>, 'context': <ATDocument at /reeple/portal_factory/Document/document.2010-12-24.9331499294 used for /reeple>, 'default': <object object at 0x2ad1b9a18ae0>, 'here': <ATDocument at /reeple/portal_factory/Document/document.2010-12-24.9331499294 used for /reeple>, 'loop': {u'field': <Products.PageTemplates.Expressions.PathIterator object at 0x1bc9b9d0>, u'fieldset': <Products.PageTemplates.Expressions.PathIterator object at 0x1d396c90>}, 'nothing': None, 'options': {'args': (), 'state': <Products.CMFFormController.ControllerState.ControllerState object at 0x1ccdb2d0>}, 'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x1d452ec0>, 'request': <HTTPRequest, URL=http://82.165.145.121:8081/reeple/portal_factory/Document/document.2010-12-24.9331499294/atct_edit>, 'root': <Application at >, 'template': <FSControllerPageTemplate at /reeple/atct_edit used for /reeple/portal_factory/Document/document.2010-12-24.9331499294>, 'traverse_subpath': [], 'user': <PloneUser 'pascalklein'>} Module Products.PageTemplates.ZRPythonExpr, line 49, in __call__ __traceback_info__: date_components_support_view.result(inputvalue, 0, starting_year, ending_year, future_years) Module PythonExpr, line 1, in <expression> Module plone.app.form.widgets.datecomponents, line 50, in result AttributeError: 'str' object has no attribute 'dates' Any suggestions? CentOS 5.5 has the Python Version 2.4. So I'm not sure if that causes the issue.

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• intersection curve of 3D mesh object and 2D plane

  - by Terry

  Hi All, I need a computer graphics book that gives the intersection curve of 3D mesh object and 2D plane. Could you advise me a book. Regards Terry

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• Selecting which object to align to in Powerpoint 2007

  - by Ash

  When doing an alignment in Powerpoint 2007 (say, Align Center), is there any way to select which object will be aligned to? It seems to pick one of the objects, but I'm not sure how it decides which one to pick and how to change it. Order of selection and front/back ordering seems to have no effect. Anyone have any ideas?

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• Sorting/Paginating/Filtering Complex Multi-AR Object Tables in Rails

  - by Matt Rogish

  I have a complex table pulled from a multi-ActiveRecord object array. This listing is a combined display of all of a particular user's "favorite" items (songs, messages, blog postings, whatever). Each of these items is a full-fledged AR object. My goal is to present the user with a simplified search, sort, and pagination interface. The user need not know that the Song has a singer, and that the Message has an author -- to the end user both entries in the table will be displayed as "User". Thus, the search box will simply be a dropdown list asking them which to search on (User name, created at, etc.). Internally, I would need to convert that to the appropriate object search, combine the results, and display. I can, separately, do pagination (mislav will_paginate), sorting, and filtering, but together I'm having some problems combining them. For example, if I paginate the combined list of items, the pagination plugin handles it just fine. It is not efficient since the pagination is happening in the app vs. the DB, but let's assume the intended use-case would indicate the vast majority of the users will have less than 30 favorited items and all other behavior, server capabilities, etc. indicates this will not be a bottleneck. However, if I wish to sort the list I cannot sort it via the pagination plugin because it relies on the assumption that the result set is derived from a single SQL query, and also that the field name is consistent throughout. Thus, I must sort the merged array via ruby, e.g. @items.sort_by{ |i| i.whatever } But, since the items do not share common names, I must first interrogate the object and then call the correct sort by. For example, if the user wishes to sort by user name, if the sorted object is a message, I sort by author but if the object is a song, I sort by singer. This is all very gross and feels quite un-ruby-like. This same problem comes into play with the filter. If the user filters on the "parent item" (the message's thread, the song's album), I must translate that to the appropriate collection object method. Also gross. This is not the exact set-up but is close enough. Note that this is a legacy app so changing it is quite difficult, although not impossible. Also, yes there is some DRY that can be done, but don't focus on the style or elegance of the following code. Style/elegance of the SOLUTION is important, however! :D models: class User < ActiveRecord::Base ... has_and_belongs_to_many :favorite_messages, :class_name => "Message" has_and_belongs_to_many :favorite_songs, :class_name => "Song" has_many :authored_messages, :class_name => "Message" has_many :sung_songs, :class_name => "Song" end class Message < ActiveRecord::Base has_and_belongs_to_many :favorite_messages belongs_to :author, :class_name => "User" belongs_to :thread end class Song < ActiveRecord::Base has_and_belongs_to_many :favorite_songs belongs_to :singer, :class_name => "User" belongs_to :album end controller: def show u = User.find 123 @items = Array.new @items << u.favorite_messages @items << u.favorite_songs # etc. etc. @items.flatten! @items = @items.sort_by{ |i| i.created_at } @items = @items.paginate :page => params[:page], :per_page => 20 end def search # Assume user is searching for username like 'Bob' u = User.find 123 @items = Array.new @items << u.favorite_messages.find( :all, :conditions => "LOWER( author ) LIKE LOWER('%bob%')" ) @items << u.favorite_songs.find( :all, :conditions => "LOWER( singer ) LIKE ... " ) # etc. etc. @items.flatten! @items = @items.sort_by{ |i| determine appropriate sorting based on user selection } @items = @items.paginate :page => params[:page], :per_page => 20 end view: #index.html.erb ... <table> <tr> <th>Title (sort ASC/DESC links)</th> <th>Created By (sort ASC/DESC links))</th> <th>Collection Title (sort ASC/DESC links)</th> <th>Created At (sort ASC/DESC links)</th> </tr> <% @items.each |item| do %> <%= render { :partial => "message", :locals => item } if item.is_a? Message %> <%= render { :partial => "song", :locals => item } if item.is_a? Song %> <%end%> ... </table> #message.html.erb # shorthand, not real ruby print out message title, author name, thread title, message created at #song.html.erb # shorthand print out song title, singer name, album title, song created at

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• Python - Converting CSV to Objects - Code Design

  - by victorhooi

  Hi, I have a small script we're using to read in a CSV file containing employees, and perform some basic manipulations on that data. We read in the data (import_gd_dump), and create an Employees object, containing a list of Employee objects (maybe I should think of a better naming convention...lol). We then call clean_all_phone_numbers() on Employees, which calls clean_phone_number() on each Employee, as well as lookup_all_supervisors(), on Employees. import csv import re import sys #class CSVLoader: # """Virtual class to assist with loading in CSV files.""" # def import_gd_dump(self, input_file='Gp Directory 20100331 original.csv'): # gd_extract = csv.DictReader(open(input_file), dialect='excel') # employees = [] # for row in gd_extract: # curr_employee = Employee(row) # employees.append(curr_employee) # return employees # #self.employees = {row['dbdirid']:row for row in gd_extract} # Previously, this was inside a (virtual) class called "CSVLoader". # However, according to here (http://tomayko.com/writings/the-static-method-thing) - the idiomatic way of doing this in Python is not with a class-fucntion but with a module-level function def import_gd_dump(input_file='Gp Directory 20100331 original.csv'): """Return a list ('employee') of dict objects, taken from a Group Directory CSV file.""" gd_extract = csv.DictReader(open(input_file), dialect='excel') employees = [] for row in gd_extract: employees.append(row) return employees def write_gd_formatted(employees_dict, output_file="gd_formatted.csv"): """Read in an Employees() object, and write out each Employee() inside this to a CSV file""" gd_output_fieldnames = ('hrid', 'mail', 'givenName', 'sn', 'dbcostcenter', 'dbdirid', 'hrreportsto', 'PHFull', 'PHFull_message', 'SupervisorEmail', 'SupervisorFirstName', 'SupervisorSurname') try: gd_formatted = csv.DictWriter(open(output_file, 'w', newline=''), fieldnames=gd_output_fieldnames, extrasaction='ignore', dialect='excel') except IOError: print('Unable to open file, IO error (Is it locked?)') sys.exit(1) headers = {n:n for n in gd_output_fieldnames} gd_formatted.writerow(headers) for employee in employees_dict.employee_list: # We're using the employee object's inbuilt __dict__ attribute - hmm, is this good practice? gd_formatted.writerow(employee.__dict__) class Employee: """An Employee in the system, with employee attributes (name, email, cost-centre etc.)""" def __init__(self, employee_attributes): """We use the Employee constructor to convert a dictionary into instance attributes.""" for k, v in employee_attributes.items(): setattr(self, k, v) def clean_phone_number(self): """Perform some rudimentary checks and corrections, to make sure numbers are in the right format. Numbers should be in the form 0XYYYYYYYY, where X is the area code, and Y is the local number.""" if self.telephoneNumber is None or self.telephoneNumber == '': return '', 'Missing phone number.' else: standard_format = re.compile(r'^\+(?P<intl_prefix>\d{2})\((?P<area_code>\d)\)(?P<local_first_half>\d{4})-(?P<local_second_half>\d{4})') extra_zero = re.compile(r'^\+(?P<intl_prefix>\d{2})\(0(?P<area_code>\d)\)(?P<local_first_half>\d{4})-(?P<local_second_half>\d{4})') missing_hyphen = re.compile(r'^\+(?P<intl_prefix>\d{2})\(0(?P<area_code>\d)\)(?P<local_first_half>\d{4})(?P<local_second_half>\d{4})') if standard_format.search(self.telephoneNumber): result = standard_format.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), '' elif extra_zero.search(self.telephoneNumber): result = extra_zero.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), 'Extra zero in area code - ask user to remediate. ' elif missing_hyphen.search(self.telephoneNumber): result = missing_hyphen.search(self.telephoneNumber) return '0' + result.group('area_code') + result.group('local_first_half') + result.group('local_second_half'), 'Missing hyphen in local component - ask user to remediate. ' else: return '', "Number didn't match recognised format. Original text is: " + self.telephoneNumber class Employees: def __init__(self, import_list): self.employee_list = [] for employee in import_list: self.employee_list.append(Employee(employee)) def clean_all_phone_numbers(self): for employee in self.employee_list: #Should we just set this directly in Employee.clean_phone_number() instead? employee.PHFull, employee.PHFull_message = employee.clean_phone_number() # Hmm, the search is O(n^2) - there's probably a better way of doing this search? def lookup_all_supervisors(self): for employee in self.employee_list: if employee.hrreportsto is not None and employee.hrreportsto != '': for supervisor in self.employee_list: if supervisor.hrid == employee.hrreportsto: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = supervisor.mail, supervisor.givenName, supervisor.sn break else: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = ('Supervisor not found.', 'Supervisor not found.', 'Supervisor not found.') else: (employee.SupervisorEmail, employee.SupervisorFirstName, employee.SupervisorSurname) = ('Supervisor not set.', 'Supervisor not set.', 'Supervisor not set.') #Is thre a more pythonic way of doing this? def print_employees(self): for employee in self.employee_list: print(employee.__dict__) if __name__ == '__main__': db_employees = Employees(import_gd_dump()) db_employees.clean_all_phone_numbers() db_employees.lookup_all_supervisors() #db_employees.print_employees() write_gd_formatted(db_employees) Firstly, my preamble question is, can you see anything inherently wrong with the above, from either a class design or Python point-of-view? Is the logic/design sound? Anyhow, to the specifics: The Employees object has a method, clean_all_phone_numbers(), which calls clean_phone_number() on each Employee object inside it. Is this bad design? If so, why? Also, is the way I'm calling lookup_all_supervisors() bad? Originally, I wrapped the clean_phone_number() and lookup_supervisor() method in a single function, with a single for-loop inside it. clean_phone_number is O(n), I believe, lookup_supervisor is O(n^2) - is it ok splitting it into two loops like this? In clean_all_phone_numbers(), I'm looping on the Employee objects, and settings their values using return/assignment - should I be setting this inside clean_phone_number() itself? There's also a few things that I'm sorted of hacked out, not sure if they're bad practice - e.g. print_employee() and gd_formatted() both use __dict__, and the constructor for Employee uses setattr() to convert a dictionary into instance attributes. I'd value any thoughts at all. If you think the questions are too broad, let me know and I can repost as several split up (I just didn't want to pollute the boards with multiple similar questions, and the three questions are more or less fairly tightly related). Cheers, Victor

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• AS3: Array of objects parsed from XML remains with zero length

  - by Joel Alejandro

  I'm trying to parse an XML file and create an object array from its data. The data is converted to MediaAlbum classes (class of my own). The XML is parsed correctly and the object is loaded, but when I instantiate it, the Albums array is of zero length, even when the data is loaded correctly. I don't really know what the problem could be... any hints? import Nem.Media.*; var mg:MediaGallery = new MediaGallery("test.xml"); trace(mg.Albums.length); MediaGallery class: package Nem.Media { import flash.net.URLRequest; import flash.net.URLLoader; import flash.events.*; public class MediaGallery { private var jsonGalleryData:Object; public var Albums:Array = new Array(); public function MediaGallery(xmlSource:String) { var loader:URLLoader = new URLLoader(); loader.load(new URLRequest(xmlSource)); loader.addEventListener(Event.COMPLETE, loadGalleries); } public function loadGalleries(e:Event):void { var xmlData:XML = new XML(e.target.data); var album; for each (album in xmlData.albums) { Albums.push(new MediaAlbum(album.attribute("name"), album.photos)); } } } } XML test source: <gallery <albums <album name="Fútbol 9" <photos <photo width="600" height="400" filename="foto1.jpg" / <photo width="600" height="400" filename="foto2.jpg" / <photo width="600" height="400" filename="foto3.jpg" / </photos </album <album name="Fútbol 8" <photos <photo width="600" height="400" filename="foto4.jpg" / <photo width="600" height="400" filename="foto5.jpg" / <photo width="600" height="400" filename="foto6.jpg" / </photos </album </albums </gallery

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• What is the equivalent of .NET events in Ruby?

  - by Gishu

  The problem is very simple. An object needs to notify some events that might be of interest to observers. When I sat to validate a design that I cooked up now in Ruby just to validate it.. I find myself stumped as to how to implement the object events. In .Net this would be a one-liner.. .Net also does handler method signature verification,etc. e.g. // Object with events public delegate void HandlerSignature(int a); public event HandlerSignature MyEvent; public event HandlerSignature AnotherCriticalEvent; // Client MyObject.MyEvent += new HandlerSignature(MyHandlerMethod); // MyHandlerMethod has same signature as delegate Is there an EventDispatcher module or something that I am missing that I can strap on to a Ruby class ? Hoping for an answer that plays along with Ruby's principle of least surprise. An event would be the name of the event plus a queue of [observer, methodName] objects that need to be invoked when the event takes place.

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• Ruby and duck typing: design by contract impossible?

  - by davetron5000

  Method signature in Java: public List<String> getFilesIn(List<File> directories) similar one in ruby def get_files_in(directories) In the case of Java, the type system gives me information about what the method expects and delivers. In Ruby's case, I have no clue what I'm supposed to pass in, or what I'll expect to receive. In Java, the object must formally implement the interface. In Ruby, the object being passed in must respond to whatever methods are called in the method defined here. This seems highly problematic: Even with 100% accurate, up-to-date documentation, the Ruby code has to essentially expose its implementation, breaking encapsulation. "OO purity" aside, this would seem to be a maintenance nightmare. The Ruby code gives me no clue what's being returned; I would have to essentially experiment, or read the code to find out what methods the returned object would respond to. Not looking to debate static typing vs duck typing, but looking to understand how you maintain a production system where you have almost no ability to design by contract. Update No one has really addressed the exposure of a method's internal implementation via documentation that this approach requires. Since there are no interfaces, if I'm not expecting a particular type, don't I have to itemize every method I might call so that the caller knows what can be passed in? Or is this just an edge case that doesn't really come up?

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• Initializing objects on the fly

  - by pocoa

  I have a vector called players and a class called Player. And what I'm trying to do is to write: players.push_back(Player(name, Weapon(bullets))); So I want to be able to create players in a loop. But I see an error message says "no matching function for call Player::Player..." Then I've changed that to: Weapon w(bullets); Player p(name, w); players.push_back(p); Here is my Player definition: class Player { public: Player(string &name, Weapon &weapon); private string name; Weapon weapon; } I'm just trying to learn what is the difference between these definitions. And is this the right way to pass an object to an object constructor. Note: These are not my actual class definitions. I'm just trying to learn something about object oriented programming in C++ with coding it. I mean I know that Weapon should be initialized in Player :)

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