When using ASTParser, we often need to find type of variable in the code. This information is contains in the binding. The following code shows how to write a stand alone ASTParser to parse Java file and get the type information of variables in the code. The target code to parse: package test; import … Read more
If you use eclipse, you probably format your code by pressing Ctrl+Shift+F or right clicking Source -> Format very often. This function is also provide in JDT, so you can also format your Java code in Java code.
Finding the correct JDT API for doing this job, however, is not straight-forward. In the following code, you will see one of the classes being used is actually an internal class.
You may try to use Eclipse JDT ASTParser to parse Java source files, but cannot get the list of internal comments in the .java file. There is a method called getCommentList from the CompilationUnit class. But if you use it, you find that it returns a list of empty comments. How to get internal comments … Read more
When using Eclipse ASTParser, if you want to get all methods and fields of the outer class and ignore the embedded inner class(es), you may try to visit all methods and fields and try to differentiate outer class and inter class.
Each class is a TypeDeclaration in AST, and Inner class is another TypeDeclaration inside the TypeDeclaration in the AST. The key question is: how to know if stuff is in a root TypeDeclaration or a inner TypeDeclaration?
When using visitor pattern to visit a FieldDeclaration node, you may want to get the variable name the node contains. It is natural to think about a method called “getName()”, but this method does not exist in FieldDeclaration class.
As you may know Eclipse JDT is a very nice tool for static analysis of Java code, a lot of research projects use Eclipse JDT. It would be more interesting, if we can see some commercial software that use JDT. Such a project can be served as a start point for learning, and as a … Read more
Let’s take a look how to parse a sequence of Java statement by using ASTParser from Eclipse JDT. By saying a sequence of a statement, I mean lines of code that are from a method like the following: int i = 9; int j = i+1;int i = 9; int j = i+1; Here is … Read more
This code example is for showing how to insert a blank line to Java source code by using eclipse JDT. The approach is similar with adding a statement or comment to source code, especially adding a comment. It will insert a blank line before the first statement in the following code: public class test { … Read more
This code example is for counting total number of methods in projects under Eclipse work space. We can use Eclipse JDT – Java Model to do this. Counting total number of method in a certain java project is a very simple task. The following code works under Eclipse Plug-in project only. If you don’t know … Read more
This code example belongs to the Eclipse JDT tutorial series. If you want to get all class names, method names and field names from a Java jar file, you can use the code below to get them. This code example is for getting information(e.g. field in a class, method name, method return type, etc.) from … Read more
This belongs to Eclipse JDT Tutorial Series. This code example is for inserting a statement to existing Java source code by using eclipse JDT. It works inside of a Plug-in. For simplicity purpose, the following code simple add a method invocation statement called “add” to the first line of a method. public class Main { … Read more
This code example belongs to the Eclipse JDT tutorial series. The goal of this code example is add a comment to the following code. public class Main { public static void main(String[] args) { int i = 1; System.out.println(i); } public static void add() { int i = 1; System.out.println(i); } }public class Main { … Read more
When using JDT, you may want to find all references of a given method and then do something with the references. This can be done by using method JDTSearchProvider.searchMethodReference(). The following is sample code: // First of all, get all the type declaration of the class. IType [] typeDeclarationList = unit.getTypes(); for (IType typeDeclaration … Read more
You may wonder what a Java class looks like as an Abstract Syntax Tree(AST). We can view AST of any Java class by using Eclipse ASTView. The AST can be easily showed in a separate view under eclipse IDE. For the following simple java class, the ASTView shows the complete AST. public class Test { … Read more
In previous post, I have shown how to use Java Model to create a new project, access an existing project, and dynamically import/load an existing project directory into workspace. The real question is if we want to parse a large number of projects(e.g. 1000) and those projects do not have .project file under it’s directory. … Read more