Validating xml using java

30-Dec-2019 05:41 by 2 Comments

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Before going into the details on how to generate source code using Annotation Processors, there is a couple of concepts that we would like to present, as we will be referring to them in the following slides: models and meta-models.One of the pillars of MDE is the construction of abstractions.

validating xml using java-76

Now, in part 3, we are going to show how an Annotation Processor can be used to generate source code. Fortunately, in the last years Model-Driven Engineering (1) (MDE, sometimes referred also as Model-Driven Development or Model-Driven Architecture) has helped to evolve a practice that was more art than science – task for ninja coders – into a mature methodology strongly based on proven processes and tools.We model the software system that we intent to build at different levels of detail and with different approaches.When one level of abstraction is modeled, we can start to model the next one and the next, ending with a complete, deployable product.CLASS) { Type Element class Element = (Type Element) e; Package Element package Element = (Package Element) class Enclosing Element(); Java File Object jfo = processing Filer().create Source File( class Qualified Name() "Bean Info"); Buffered Writer bw = new Buffered Writer(Writer()); bw.append("package "); bw.append(package Qualified Name()); bw.append(";"); Line(); Line(); // rest of generated class contents The previous example is simple, interesting, but a mess!We are mixing the logic of getting the information we need from annotations (the model) with the logic that writes the generated file (the view).The following example shows how to create a Java source file inside an Annotation Processor.

The generated class name will be the same as the annotated class name plus the string “Bean Info”, as if we were generating a Bean information class: if (Kind() == Element Kind.This post is the third and final part in my series about Code Generation using Annotation Processors in the Java language.In part 1 (read it here) we introduced what Annotations are in the Java language and some of their common uses.Annotation Types will act as meta-models, while a set of Annotations in a given piece of code will act as a model.We can leverage this model to generate configuration files or to write new source files that are derived from one existing.Let’s create a file named and place it under the src/main/resources of the Maven processor artifact. Simple Bean Info All this information (the model) will be extracted from annotations found in the source class and stored in Java Beans to be passed to Velocity.