Questions tagged [reflection]

Reflection is the process by which a program can observe and modify its own structure and behavior at runtime.

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35 views

Performance impact of using reflection instead of an “Options” class

I am trying to refactor a service by providing some options on what to bring back. I can't decide what is best way to go between the below A. Use a class for the options Create a new class for the ...
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Yet another reflection library

Tried to do my own implementation of reflection(introspection) for using in my next projects. Is it optimized at compile time? If no, how can I improve it? This macro is good interface for adapting ...
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1answer
79 views

C# Reflection-based CSV Parser

I've been trying to make a C# version of my Java CSV Parser using C# specific idioms. Here is the full code: ...
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2answers
90 views

Java Reflection-based CSV Parser

I'm an experienced Java developer, however I don't have experience with reflection or Annotation classes. For fun, I tried to develop a CSV Reader class which can parse each row into a particular type....
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2answers
70 views

Find all classes A that implement B<T> and aggregate both A and T to build a map out of them

In my project I have the following base interfaces used through the application: interface Node { /* ... */ } interface NodeService<T> { /* ... */ } ...
2
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1answer
94 views

Pass class property as parameter to extension method

I have the following class structure: MyAttribute.cs ...
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2answers
64 views

Feedback on automatic form filling with reflection

Context: I need to fill a handful of .docx templates with answers that come from form.responses, which is a dynamic object that comes from a JSON and can have different properties that vary according ...
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1answer
148 views

To convert all the class properties to IDictionary<string, dynamic>

I have the requirement to return the result of my ViewModel as a Dictionary of KeyValue pairs. My view model comprises of multiple classes and can have null values in properties. I need to return only ...
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0answers
85 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
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0answers
34 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 ...
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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
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2answers
269 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
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3answers
202 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 ...
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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
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2answers
115 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
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2answers
502 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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5answers
125 views

PHP function to obtain model_name from Namespace\To\ModelName

Would there be a more clear/efficient way to write ...
6
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2answers
1k 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. ...
6
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1answer
172 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
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3answers
345 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
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1answer
67 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
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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
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1answer
77 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
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1answer
74 views

Settings class implementation

I have a settings.txt file with the following format: ...
3
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1answer
87 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
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3answers
132 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
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0answers
168 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
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1answer
119 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. ...
3
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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
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1answer
85 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
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1answer
82 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! ...
4
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1answer
100 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
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1answer
1k 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: ...
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64 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 ...
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1answer
85 views

Using Reflection to call multiple methods and cast various classes [closed]

I have written the following Reflection code: ...
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3answers
61 views

Finding the name of a given constant using reflection

The code below comes from the Arm_const class of my Android disassembler project: ...
1
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1answer
262 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. ...
3
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1answer
38 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
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1answer
241 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
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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
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2answers
758 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
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1answer
292 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
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1answer
669 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
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1answer
145 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 ...
6
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2answers
2k 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
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3answers
3k 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
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1answer
91 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 ...
10
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5answers
17k 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
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2answers
45 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
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1answer
67 views

Object formatter using reflection

I am making an object formatter for use when debugging. Formatted class: ...

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