Improve OutNodeVariableVisitor

/** Visitor that obtains a set of variables that may have been redefined in

 *  an expression passed as parameter to a call. */

public class OutNodeVariableVisitor extends VoidVisitorAdapter<Set<NameExpr>> {

public class OutNodeVariableVisitor extends VoidVisitorAdapter<Set<Expression>> {

    @Override

    public void visit(ArrayAccessExpr n, Set<NameExpr> variables) {

    public void visit(ArrayAccessExpr n, Set<Expression> variables) {

        n.getName().accept(this, variables);

    }

    @Override

    public void visit(CastExpr n, Set<NameExpr> variables) {

    public void visit(CastExpr n, Set<Expression> variables) {

        n.getExpression().accept(this, variables);

    }

    @Override

    public void visit(ConditionalExpr n, Set<NameExpr> variables) {

    public void visit(ConditionalExpr n, Set<Expression> variables) {

        n.getThenExpr().accept(this, variables);

        n.getElseExpr().accept(this, variables);

    }

    @Override

    public void visit(EnclosedExpr n, Set<NameExpr> variables) {

    public void visit(EnclosedExpr n, Set<Expression> variables) {

        n.getInner().accept(this, variables);

    }

    @Override

    public void visit(ExpressionStmt n, Set<NameExpr> variables) {

    public void visit(ExpressionStmt n, Set<Expression> variables) {

        n.getExpression().accept(this, variables);

    }

    @Override

    public void visit(FieldAccessExpr n, Set<NameExpr> variables) {

    public void visit(FieldAccessExpr n, Set<Expression> variables) {

        n.getScope().accept(this, variables);

    }

    @Override

    public void visit(NameExpr n, Set<NameExpr> variables) {

    public void visit(ThisExpr n, Set<Expression> variables) {

        variables.add(n);

    }

    @Override

    public void visit(UnaryExpr n, Set<NameExpr> variables) {

        switch (n.getOperator()) {

            case POSTFIX_DECREMENT:

            case POSTFIX_INCREMENT:

            case PREFIX_DECREMENT:

            case PREFIX_INCREMENT:

                n.getExpression().accept(this, variables);

        }

    public void visit(NameExpr n, Set<Expression> variables) {

        variables.add(n);

    }

    // Expressions that stop the visit: no object can be outputted, modified inside the call and returned so that

    // we may access its value.

    @Override

    public void visit(UnaryExpr n, Set<Expression> variables) {}

    @Override

    public void visit(ArrayCreationExpr n, Set<Expression> arg) {}

    @Override

    public void visit(ArrayInitializerExpr n, Set<Expression> arg) {}

    @Override

    public void visit(BinaryExpr n, Set<Expression> arg) {}

    @Override

    public void visit(ClassExpr n, Set<Expression> arg) {}

    @Override

    public void visit(InstanceOfExpr n, Set<Expression> arg) {}

    @Override

    public void visit(MethodCallExpr n, Set<Expression> arg) {}

    @Override

    public void visit(ObjectCreationExpr n, Set<Expression> arg) {}

    @Override

    public void visit(LambdaExpr n, Set<Expression> arg) {}

    @Override

    public void visit(MethodReferenceExpr n, Set<Expression> arg) {}

}