How to get all visible variables for a certain method in JDT

Question

I want to develop an Eclipse plug-in which get all visible variables for a specific method. For example:

public class testVariable {  
    String test1;  
    Object test2;
        void method_test1(){
            int test3,test4;
        }
        void method_test2(){
            int test5,test6;
            //get variable here!!!!
        }
}

I just want to get visible variable is: test1, test2,test5,test6 in method method_test2. What can I do?

Answer 1

Actually, JDT can be used outside of a plug-in, i.e., it can be used in a stand-alone Java application.

The following code can return the variables you want:

public static void parse(char[] str) {
ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setSource(str);
parser.setKind(ASTParser.K_COMPILATION_UNIT);

final CompilationUnit cu = (CompilationUnit) parser.createAST(null);
cu.accept(new ASTVisitor() {

    public boolean visit(VariableDeclarationFragment var) {

        System.out.println("variable: " + var.getName());

        return false;
    }

    public boolean visit(MethodDeclaration md) {

        if (md.getName().toString().equals("method_test2")) {
            md.accept(new ASTVisitor() {
                public boolean visit(VariableDeclarationFragment fd) {
                    System.out.println("in method: " + fd);
                    return false;
                }
            });
        }
        return false;
    }
});

}

The output is:

variable: test1
variable: test2
in method: test5
in method: test6

Check out more examples at JDT tutorials.