Mapper | Map mapper library | Object-Relational Mapping library
kandi X-RAY | Mapper Summary
kandi X-RAY | Mapper Summary
Mapper is a tiny yet very powerful library which allows you to create custom strongly-typed instances from any kind of structured data (JSON and other data interchange formats, for example) with only a single initializer. And vice versa - with only a single method. Mapper extensively uses power of Swift generics and protocols, dramatically reducing the boilerplate you have to write. With Mapper, mapping is a breeze. The maing advantage of Mapper is that you don't need to write multiple initializers to support mapping from different formats (if you've done it before - you know what I mean), thus eliminating the boilerplate and leaving only the core logic you need. With Mapper your code is safe and expressive. And while reducing boilerplate, Mapper is also amazingly fast. It doesn't use reflection, and generics allows the compiler to optimize code in the most effective way. Mapper itself is just a core mapping logic without any implementations. To actually use Mapper, you also have to import one of Mapper-conforming libraries. You can find a current list of them here. If you want to support Mapper for your data types, checkout Adopting Mapper short guide. Mapper is deeply inspired by Lyft's Mapper. You can learn more about the concept behind their idea in this talk.
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QUESTION
While deleting and adding works fine, when I update the Parent collection of child entities, the foreign keys on child records are simply set to null. I'd like them to be completely removed from the database.
So I've been trying Cascade.All
, Cascade.DeleteOrphans
, Cascade.All.Include(Cascade.DeleteOrphans)
and nothing seems to work.
If I set Inverse to true on the parent but it causes the child records to not get updated at all.
Here's my code:
Parent class mapping ...ANSWER
Answered 2021-Jun-14 at 15:43Changing Update() to Merge() worked for me.
QUESTION
Im trying to make a generic instance mapper from an SQLite DB to my project logic layer.
Each entry in the mapper is an instance of some class "DAL< name >" for example DALProduct
all in the same package that extends class DALObject
with the following structure:
ANSWER
Answered 2021-Apr-27 at 00:36This would be a perfect instance of when to use an annotation. You could define the annotation before the declaration of each class, indicating that the class has some meta-data about 'DALObjects'. Then you could use Reflections or some similar library to easily find all Class objects with this annotation.
For example;
QUESTION
Now I am using ObjectMapper to convert a Map to POJO in java, this is my code:
...ANSWER
Answered 2021-Jun-13 at 09:02Looking at the analysisInfo
map, the field names do not match the instance variable name in your POJO. For instance, the field name is fullPullChannelCount
whereas your map has fullpullchannelcount
.
Use @JsonProperty
to map the property name in the map to the variable in the POJO.
QUESTION
I am using a 3.5: TFT LCD display with an Arduino Uno and the library from the manufacturer, the KeDei TFT library. The library came with a bitmap font table that is huge for the small amount of memory of an Arduino Uno so I've been looking for alternatives.
What I am running into is that there doesn't seem to be a standard representation and some of the bitmap font tables I've found work fine and others display as strange doodles and marks or they display upside down or they display with letters flipped. After writing a simple application to display some of the characters, I finally realized that different bitmaps use different character orientations.
My questionWhat are the rules or standards or expected representations for the bit data for bitmap fonts? Why do there seem to be several different text character orientations used with bitmap fonts?
Thoughts about the questionAre these due to different target devices such as a Windows display driver or a Linux display driver versus a bare metal Arduino TFT LCD display driver?
What is the criteria used to determine a particular bitmap font representation as a series of unsigned char values? Are different types of raster devices such as a TFT LCD display and its controller have a different sequence of bits when drawing on the display surface by setting pixel colors?
What other possible bitmap font representations requiring a transformation which my version of the library currently doesn't offer, are there?
Is there some method other than the approach I'm using to determine what transformation is needed? I currently plug the bitmap font table into a test program and print out a set of characters to see how it looks and then fine tune the transformation by testing with the Arduino and the TFT LCD screen.
My experience thus farThe KeDei TFT library came with an a bitmap font table that was defined as
...ANSWER
Answered 2021-Jun-12 at 16:19Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:
- the memory architecture of the target computer,
- the architecture and communication pathways to the display controller,
- character glyph height and width in pixels and
- the amount of memory for bitmap storage and what measures are taken to make that as small as possible.
A brief overview of bitmap fonts
A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.
Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.
A brief history of using bitmap fonts
The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.
Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.
With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.
In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.
Representation of bitmap fonts in source code
There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format
The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.
Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.
As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.
However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:
Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:
QUESTION
My project uses MapStruct successfully when it does not include Flux or Flow streams. When I try to generate a mapper with a Flow or Flux, I receive an error: "error: The return type Flow is an abstract class or interface." Since Flow and Flux are interfaces, is there a way to still use MapStruct or do I have to roll my own mapper in this use-case?
Thank you for your comments and time
...ANSWER
Answered 2021-Jun-12 at 07:19I don't know from what you want to create the Kotlin Flow or Reactor Flux. If it is from other Flow or Flux then you will have to do that partially manual
e.g.
QUESTION
Shortly, I'd like to move this code inside a mapstruct mapper:
...ANSWER
Answered 2021-Jun-12 at 07:10With MapStruct you can define mapping between different iterable. However, you can map from a nested listed into a top level list in a method (You can if it is wrapped though).
In any case for this I would suggest doing the following:
QUESTION
I installed a Kubernetes cluster of three nodes, the control node looked ok, when I tried to join the other two nodes the status for both of is: Not Ready
On control node:
...ANSWER
Answered 2021-Jun-11 at 20:41After seeing whole log line entry
QUESTION
I'm working on a Golang Micro-service which uses Java based Cucumber tests for BDDs.
There is a date variable inside the schema and it is defined as:
...ANSWER
Answered 2021-Jun-11 at 11:49The Go code you provided will not impact the way how the Time
instance will be serialized as you are parsing it back into Time
after serializing it to a string
.
If you have control over how your date fields are serialized, you can apply the following format that should be aligned with what you provided to Jackson's ObjectMapper
:
QUESTION
I am trying to serialize a message (then deserialize it) and I do not want any of the headers json__TypeId__ or json_resolvableType to contain the canonical name of the class. This is because I am sending the message over the network and I consider including the canonical name in the header a security concern.
Here is just the relevant parts of the code that I am using:
...ANSWER
Answered 2021-Jun-11 at 14:01You can create a new message from transformed and remove headers you don't need
QUESTION
I had used the below command in GCP Shell terminal to create a project wordcount
...ANSWER
Answered 2021-Jun-10 at 21:48I'd suggest finding an archetype for creating MapReduce applications, otherwise, you need to add hadoop-client
as a dependency in your pom.xml
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