Question

I have to find all the methods in a class that use a particular member variable. (like “References” in eclipse but I want to implement using code…)I use AST visitor pattern that visits FieldDeclaration to get the name and type of all the member variables. I also use visitor pattern that visits MethodDeclaration nodes to get the content of each method using getBody(). Now I have the field variable name, type and member method details. I thought I can use a string search on the content of each member method but for a variable name “a”, search may return true for keywords like “class” and others too!!! Is there a way to find the usage of a particular variable corresponding to a fieldDeclaration?? (like Binding or something??) If so, what is the AST Node or Class?

Here’s the code I used…

 SimpleNameVisitor simpleNameVisitor=new SimpleNameVisitor();
 //SimpleNameVisitor is the visitor pattern for SimpleName
 simpleNameVisitor.process(mthd.getMethodBlock());
 //mthd is the object that stores method details
 for(SimpleName simpName:simpleNameVisitor.getIdentifiers()){
    if(varName.contentEquals(simpName.getFullyQualifiedName())){
        //varName is the field variable name
        System.out.println("MethodName: "+mthd.getName());
        return;
    }
  }

Here’s the code that solved the problem(suggested by wjans;changed equals to contentEquals)

VariableDeclarationFragment fragment = ... ;
IBinding binding = fragment.getName().resolveBinding();


public boolean visitNode(SimpleName simpleName) throws Exception {
if (binding.toString().contentEquals(simpleName.resolveBinding().toString()) {
    ....
}

}

Answer 1

You can do something like this:

Keep a reference to the binding of your FieldDeclaration,

VariableDeclarationFragment fragment = ... ;
IBinding binding = fragment.getName().resolveBinding();

and use this to compare it with the bindings when visiting SimpleName’s inside your MethodDeclaration

public boolean visitNode(SimpleName simpleName) throws Exception {
    if (binding.equals(simpleName.resolveBinding()) {
        ....
    }
}