Change method level String variables with JavaParser

Question

I want to use JavaParser in order to change all String variable values in a Java source code from any value to "".

I can change the value of the global variables, but I cannot manage to change the value of the method level variables.

Looking around, I got help from this and this answers and now I can get the value of every line of code in each method, like so:

static void removeStrings(CompilationUnit cu) {
        for (TypeDeclaration typeDec : cu.getTypes()) {
            List<BodyDeclaration> members = typeDec.getMembers();
            if (members != null) {
                for (BodyDeclaration member : members) {
                    if (member.isMethodDeclaration()) {                                                  // If it is a method variable
                        MethodDeclaration method = (MethodDeclaration) member;
                        Optional<BlockStmt> block = method.getBody();
                        NodeList<Statement> statements = block.get().getStatements();

                        for (Statement tmp : statements) {
                            // How do I change the values here?
                        }

                    }
                }
            }
        }
    }

Now, how do I change the values of tmp if it is a String declaration?

Andreas · Accepted Answer · 2018-05-10 18:26:50Z

3

Do you mean like this?

static void removeStrings(CompilationUnit cu) {
    cu.walk(StringLiteralExpr.class, e -> e.setString(""));
}

Test

CompilationUnit code = JavaParser.parse(
        "class Test {\n" +
            "private static final String CONST = \"This is a constant\";\n" +
            "public static void main(String[] args) {\n" +
                "System.out.println(\"Hello: \" + CONST);" +
            "}\n" +
        "}"
);
System.out.println("BEFORE:");
System.out.println(code);

removeStrings(code);

System.out.println("AFTER:");
System.out.println(code);

Output

BEFORE:
class Test {

    private static final String CONST = "This is a constant";

    public static void main(String[] args) {
        System.out.println("Hello: " + CONST);
    }
}

AFTER:
class Test {

    private static final String CONST = "";

    public static void main(String[] args) {
        System.out.println("" + CONST);
    }
}

answered May 10, 2018 at 18:26

Andreas

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1 Comment

undisp Over a year ago

You solved two problems (the String declarations and print's) with one line of code. I see I was complication too much. Thank you very much! Perfect solution for my problem!

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