Questions tagged [reflection]
Reflection is the process by which a program can observe and modify its own structure and behavior at runtime.
215
questions
1
vote
0answers
70 views
Generics and aggregated evaluation of validation rules
I have a custom system for data validation; it handles anything from method parameters, return values, objects, etc. The core of this system is IValidationRule and ...
2
votes
0answers
24 views
Library/API: simple springboot / jdbc query builder and ORM
I have been using and developing a simple ORM and query builder library that I have found useful in it's practical application. I am pretty sure there are improvements to be made, and I welcome any ...
5
votes
0answers
107 views
Factory class that uses reflection to instantiate objects by class name
In this SO post Dynamically choose class from string Alexander Platonov creates a Function on the fly and then uses Application.Run() to instantiate an Object by ...
9
votes
2answers
244 views
Immutable builder and updater
There aren't enough questions about creating immutable objects... so why not try it again with another approach. This time, it's a builder that maps properties to constructor parameters. Properties ...
2
votes
3answers
107 views
Simple middleware pipeline builder (similar to asp.net-core)
I created a simple middleware pipeline builder that I want to use for my frameworks. It is similar to how ASP.NET-Core middleware works and uses the same conventions:
A public constructor with a ...
4
votes
0answers
26 views
Inherit docstrings from specified parent
I was recently working on some python where I was working with multiple inheritance and mixins and stuff like that, and I wanted to inherit docstrings for specific functions, from specific parents (...
4
votes
2answers
105 views
Registering Named services and resolving them by T
Problem statement
I have an application that needs to get files from various sources (disk, embedded, http, ftp, ...) so I use a common API for them:
...
5
votes
2answers
492 views
Reducing using/foreach/using nesting with a helper extension
Problem statement
There are sometimes foreach scenarios that require deep nesting due to multiple disposable objects involved that look like this:
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1
vote
5answers
87 views
PHP function to obtain model_name from Namespace\To\ModelName
Would there be a more clear/efficient way to write
...
5
votes
2answers
444 views
Fetch and print all properties of an object graph as string
Below I have setup an extension method that takes any object, cycles through its properties, and prints each out to a Console window in the format Name: Value.
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6
votes
1answer
152 views
Enumerate all members and types with specific attributes
I have a use-case where I need to retrieve all members with specific attributes in the class and interface hierarchy - I usually need the first match and apply its rules to child members. The built-in ...
6
votes
3answers
336 views
Calculating time windows for entities
I have made some code that operates on multiple entities and creates 'time windows' for them. Basically, the entities will contain states, usually in boolean or int. They will be timestamped and in ...
2
votes
1answer
53 views
Populating dropdown lists, using SQL vs. using expression trees and reflection
I'm working with a large enterprise SQL Server database with dozens of tables that are used mainly as lookups to populate dropdown lists, etc. These tables all follow the convention of having (table)...
1
vote
1answer
43 views
Update any controls' Text for the specified language [closed]
I would like to optimize the below code The only difference is the datatypes RadioButton, Label, and Button. Outside the method I have an loop that iterates over all the controls in the aspx-page. I ...
3
votes
1answer
61 views
Assigning test-data parameters by name
When creating data-driven tests with xUnit we can use the MemberDataAttribute to get the data from a member of this or other ...
3
votes
1answer
73 views
3
votes
1answer
79 views
Exploring code objects
The first version of my solution was wrong (the usage of compile() function), for details see Stack Overflow.
The solution has been fixed and now it works ...
11
votes
3answers
110 views
Simple generic auto __repr__
Preface
At some point I was tired of writing & supporting __repr__ methods, so I've decided to write it once and reuse everywhere in my classes.
Since I'm ...
3
votes
0answers
76 views
Generic object-to-XML mapper
This code is part of a larger mapping library I'm working on to address some business concerns of transforming data. I was inspired by mapstruct in Java, but opted for users to annotate / add ...
2
votes
1answer
88 views
Class to fill model objects with data from the database
This is a helper class that helps fill models with data obtained from the database.
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3
votes
1answer
35 views
Snippet to get all local classes from a module
I'm working on a project which due to the complexity of the business logic has had to pull out some classes to do computation related to some values in a database. To link the code and database, both ...
4
votes
1answer
72 views
Immutable type updater using a special constructor
I wanted to update some properties of my UriString but since this type is immutable, it wouldn't work. Actually, I just wanted to update the Path property but I don'...
2
votes
1answer
65 views
Reflection optimization for export CSV on large scale
So, I'm building export/import CSV helper. I have some performance issues in the code below. it takes me to parse CSV of 25,000 rows at 7 seconds.
If someone can help, it will be awesome!
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4
votes
1answer
83 views
Dynamic setting names based on properties
In one of my frameworks that I use with many tools I have an ExpressionVisitor whose job is to resolve the exact property, it's declaring type and instance. I ...
5
votes
1answer
658 views
Making TypeNameHandling in json.net more convenient
Handling abstract types in json.net can be sometimes challenging because it requires a very long and complex syntax like:
...
1
vote
0answers
57 views
Dependency resolver in PHP
I wrote a simple Dependency Resolver in PHP that I'm hoping to get some input on.
The main problem that gave me some trouble was when it had to resolve typed arguments ( like type hinting a ...
-2
votes
1answer
57 views
Using Reflection to call multiple methods and cast various classes [closed]
I have written the following Reflection code:
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1
vote
3answers
60 views
Finding the name of a given constant using reflection
The code below comes from the Arm_const class of my Android disassembler project:
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0
votes
1answer
193 views
Kotlin reflection to generate one class from class similar with similar properties
This code is intended to generate a class (domain) from a class with class with similar/identical properties (api). Motivation is to speed development time when using clean architecture.
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3
votes
1answer
36 views
Order loaded modules by amount of functions
I am trying to solve some exercises from the "Programming Erlang" book.
One of them is "Write a function to determine which module exports the most functions"
This is my solution:
...
3
votes
1answer
193 views
CSV Reader from scratch
I am new to Java and not quite familiar with its design patterns.
I have tried to implement a CSV-File reader from scratch. The CSVFile constructor accepts the path to the file and a class which ...
3
votes
1answer
2k views
Use reflection to check for class methods with a custom attribute
This code is within a ViewModelBase class. I have a custom attribute defined that is meant to trigger methods when a property is changed. The following runs as the ViewModel is being constructed. ...
4
votes
2answers
561 views
Populate null fields in an object through reflection
I have recently implemented this utility class for going through an instance's member fields recursively and assigning them default values if they are null. Here is the implementation in the ...
5
votes
1answer
229 views
Python function to hash a python function
I'm working on a sort of distributed build system. The system allows execution of snippets of scripts as build steps. I need to be able to hash these snippets of code in a way that comments and doc ...
6
votes
1answer
539 views
Fake duck typing with dynamic
There are sometimes situations where you have a couple of related classes with static fields or properties but you cannot access them via ...
2
votes
1answer
112 views
Factory Design Pattern in Java [closed]
I am currently attempting to understand the fundamentals of factory methods in Java and I found a lot of exampels where a pattern like this has been used.
I got some exercises about sorting algorithms ...
5
votes
2answers
1k views
Custom enumeration classes
Lately I've been using a lot of enums in my project and the lack of generic Enum constraint seems to be quite problematic. This combined with few other headaches ...
3
votes
3answers
2k views
Method to return a collection of objects, filtered by a string
I have a Vehicle object which has a few properties such as Make, Model, ...
2
votes
1answer
88 views
Event based input files management system
I'm currently making a system that can accept different sorts of files and some classes are interested only in specific types of files, while some don't discriminate at all.
Note
Type of file isn't ...
9
votes
5answers
13k views
Convert a custom object to a query string
I wrote an extension method that takes a custom object and converts its properties to a query string for use in a URL. You can specify what properties you want included by using a ...
6
votes
2answers
43 views
Calculate all LED characteristics given random sufficient set of parameters
I'm shopping for LED strips and as there are so many variations I need some help by visualizing different product properties.
For that I made a class that describes(holds data for) LED strips. There ...
1
vote
1answer
65 views
Object formatter using reflection
I am making an object formatter for use when debugging.
Formatted class:
...
-3
votes
1answer
170 views
Use inheritance to reuse toString/equals/hashCode [closed]
Does it bad practice inherit class to reuse toString/equals/hashCode (that actually based on reflection and use actual class field for it)?
For example:
...
7
votes
1answer
1k views
Mimic C#'s nameof() in Python
I rewrote some code I posted earlier this month. It attempts to mimic C#'s nameof() by extracting names from bytecode instructions.
This seems more reliable than ...
1
vote
1answer
1k views
Changing object attributes by calling getters and setters using reflection
We have a class with 10 attributes (longs, Strings) the following method should change any attribute to any value of an object specified by the client,
It mimics the SQL update statement ...
4
votes
1answer
124 views
Frame hack to get variable names as strings
I don't claim this is useful nor that it adheres to best practices. There's also no good reason the hack is a context manager, and it won't work on the interactive shell.
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8
votes
2answers
6k views
Copy a similar list to another
My code works fine and I am just wondering is there a more efficient way to copy a similar list to another and ignore the properties which are not present.
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4
votes
2answers
2k views
Test all properties with single test function
In writing unit tests for c# functions, there is a good case made for testing properties. In testing those properties, I felt there should be a few goals.
Provide a wide range of inputs
Test ...
1
vote
0answers
610 views
C# MVC Generic Custom Model Binder
I recently created a custom model binder as a training exercise and wanted to see how I could improve it. It currently uses recursion and works great, but I was wondering how I could convert this to ...
1
vote
2answers
164 views
C# - exercise - object validation - reflection - generics - follow-up
Here's a C# class as an example for object validation. For this purpose I decided to use .NET reflection and tried to use generics, probably not in the correct way, that's why I'm writing this post. I ...
