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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Generic Null/Empty check for each property of a class
I have created a method to check for null/empty values of class properties and if any null property is found I'm stopping the checking process and returning the result as true. I've used a solution ...
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Code that uses reflection to validate arguments
I wrote an answer to this question on the Software Engineering SE site and was hoping to get it critiqued. (I'm told that it's acceptable to do so).
Essentially, this code uses reflection to check to ...
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Get n-th data member of a struct
To get n-th member of a struct without non-empty bases and w/o non-public members C++ now have a pretty way:
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Determine the class hierarchy of a class
My only concern with the following class is the line hierarchy.trimToSize() in determineHierarchy, because it is not necessary ...
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Java CLI Program Commands
As I was creating a CLI program, I realized having a ton of switch/if-then statements was a messy way to process user input. So, I set up a way to dynamically create commands as I added modules (...
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Serializing Objects to Delimited Files Part II
This is a follow up to my previous question: Serializing objects to delimited files
I've added some feature enhancements, and based on suggestions from rolfl in chat, I've fixed up a couple ...
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Python deep get
I'm implementing deep_get functionality to look inside arbitrarily nested Python 2.7 objects. Primarily for further logging.
This turned out to have surprising ...
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Enumerations via reflection in AS3
I'm very much used to enumerations a la Java, where each value in an enum is a distinct object. You can call functions on these objects, and they're generally ...
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Decoupled chain of responsibility in Python
I've started to learn Python today. I'm trying to write decoupled middleware or chain of responsibility pattern.
In my app I have some two classes:
abstract class or interface named Processable
...
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1
answer
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Unit test code for a private median-of-three function, using reflection [closed]
A Junit test class is used to test the class LibraryCounter. Reflection was used to test the private methods. This made the code much more complicated.
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Illumination as a way of instantiating new objects
Basically, what I mean by illumination is having a method create an object where the caller supplies all the dependencies. This allows us to hide our new keyword ...
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Custom Exception.ToString() formatter
I find the default Exception.ToString() formattig very difficult to read especially if there are inner exceptions involved. I guess everyone knows how it looks:
<...
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Accessing and caching attributes
I have the following manager class that handles access and caching attributes from classes. I am a bit worried about the caching mechanism.
Is there a better way of handling it?
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Serialize and deserialize n dimensional int array
I've made two symmetric methods which serialize an int array of any number of dimensions into an OutputStream, and read such an array from an InputStream. I was wondering if there is ways this code ...
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Serializing objects to delimited files
For a new project I'm going to need to be able to serialize random types to TSV or CSV files, so I write a class which can be used to serialize any object to a TSV, CSV or any other _SV file you can ...
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Business logic parallelization engine
In my Java 8 application there are 3 different classes but each of them contains one similar method, which is dedicated to parallelization of the business logic ...
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1
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Extended WebBrowser control
I needed the ability to do a few extra things with a WebBrowser control on a .NET Windows Forms Form, and I found it needed some updates.
So, I made a few. I added ...
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Determine if Class B uses Class A ( Java Reflection)
Below is a function that determines if Class B uses Class A.
Currently, it tests for:
Fields
Superclass
Constructors
Methods
...
user102889
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3
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Generic extension method that will attempt to parse a string and return it's value or default(T)
So I got sick of several things about the way TryParse works. I implemented a generic ParseOrDefault function using reflection. It appears to work as expected, but I'm not fool enough to say my code ...
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Data model decomposition into key value pairs using reflection and attributes
I'm trying to change how our system generates PDF files. Currently I have a class for each PDF that goes through the model for the PDF and fills in the properties. I want to change that to a self ...
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1
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Invoking API calls with parameters specified using JSON
I have an instance of a Java class that I need to call some functions on, using the API exposed by another party. For each call, I need to both check for thrown exceptions, and check the value of the ...
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Corrupting Java arithmetic through reflection
Inspired by a PPCG answer, I wrote this code, which shuffles the autoboxing caches of Number subclasses.
This leads to, among other things, outputting ...
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Milking a COM type library: "fun" with COM reflection
Once upon a time, there was a duck that wanted to know where and how user code was calling into the VBA standard library and Excel object model. To match the rest of its API, the poor little duck had ...
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Storing disassembled data in a structured way
I want to store the information returned by the dis function of the dis module in a structured way, using a dict, associating the mnemonics of each code of a line to the correspondent line number.
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Property validation
I require that the Feature set of my Licence to have a non-empty intersection with a set of features that the module I am ...
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Pagination links for various lists using Spring-HATEOAS
I'm using Spring HATEOAS to create some links on my REST API. However, the entities i'm returning are very close, so the code to generate the links are the same:
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Tracking Entity Changes (not EF)
So, I kept refactoring my Sage300 API wrapper - I wanted the client code to feel just like using Entity Framework - this is the closest I got to it:
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Reflection optimization
In a web application I'm working on I have a class that Map objects to other (different) objects. It is implemented with something like:
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Linq-to-Sage Implementation
Following-up on my last question where I wrapped the Sage API with a familiar IRepository interface, I decided to push the abstraction a step further, and... ...
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Method/parameter tracer
I am writing a class which can log the activity of an application during run time. The plan is that the SupportMI string will be sent to a DB, from where I can use ...
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Wrapping the Sage300 View API with... a Repository
Related: Something like a LINQ provider
I needed to work with the Sage300 View API. I had never worked with it, but my first impression has been that the API is ...
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Request handler based solely on reflections ver. 2
This question is connected to the previous one: Request handler based solely on reflections
I have edited the code, taking tim's answer in regard, editing the Kernel class cohesion.
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Request handler based solely on reflections
The code itself is divided into 3 logical parts:
Core modules (I call them Kernel modules, my love for Linux) - those are basic modules a web-developer would need, e.g. database wrapper class (PDO), <...
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NullGuard for throwing more informative exceptions
This small utility class is my solution for a more convenient way for checking against null. I also wanted to have more informative NullReferenceExceptions but I ...
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How to refactor this mapping class not to violate SOLID
So I have the below (which is working correctly and all my unit tests are passing) but it's ugly and is violating SOLID, I will have to change the class every time I want to be able to map a different ...
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Give me thy name, I'll invoke thee
This generic function invokes a property of a given object by name:
...
user42412
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4
answers
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Using reflection in a test to check if a private variable is really null after a function, is this okay?
I am using reflection to check if a private variable is set to null after the logout function. This is needed because the getUser function will always attempt to set and return an user if no user is ...
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Creating instance of all classes that have certain attribut value
I have a simple custom attribute MessageDeliveryAttribute that has one string filed. Also I have several classes that mark with this attribute like:
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1
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Looking up alias using inspect in Python
I'm on a quest for making a good debug_print() method for printing out debug information in some of my private projects. When testing I aliased my ...
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"Better" Exception with autogenerated message
Because I don't like writing the same useless exeption messages all the time ;-) I thought I create a better exception that would make this for me. This is what I came up with:
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A C function for returning the address of the calling function
Suppose you are given two functions, foo and bar, and neither of them are inlined. Now, if ...
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Generic toString() for JPA base entity class
In a Java/JPA project I usually define a base class (on which I put the id). The goal is to implement an generic toString() on this base class (named BaseEntity) from which all other entities inherit. ...
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Map all symbols in module to dictionary
The div and add functions are located randomly in my package structure. I have a function with this signature:
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Getting a list of all fields in an object
I've got the following code that I use to output a list of all (public) fields in an object in an easy(ish) to read way. The issue with it is that the code is not easy to look at, and I'm not sure ...
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IEnumerable extension method that ingests SqlCommand and returns query results
The following ingests a preexisting SqlCommand and returns the values.
A couple caveats right now.
1 ) Type properties must be named identical to the SQL column
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votes
1
answer
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Getting translated string using reflection and Resource Manager
I wrote the following code to get the translated string from Resource Manager. The method GetTranslatedString is called more than 50 times in my project.
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answer
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Redis Object storage and conversion
I am stepping into a new realm with this project, Reflection. I have written some working code (below) that will potentially store POCO objects in a redis cache (and eventually backed by Table or ...
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Method for finding all classes
This was inspired by a Stack Overflow question about getting all the classes of an application and I took it a little too seriously (or perhaps not seriously enough).
It's rather silly to do it this ...
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Listing human-readable enums
I'm trying to do some util class to operate on enums - convert Enums to its special strings representation via interface method.
String stored in enum constructors.
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