How to convert string to By type

Question

How to convert String to By type.

Following is my scenario: Keep object identification in Properties file in below manner

username=By.id(\"username\")
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Answer 1

You have to evaluate the entire expression within the context of existing code. You should framework such as JEXL or expressionoasis

Code below uses JEXL

// Create JexlEngine instance
JexlEngine jexl = new JexlEngine();
// Create Expression object for the string
Expression e = jexl.createExpression(prop.getProperty("username"));

// Create a context. You can pass reference to any object you want to use inside the expression
JexlContext jc = new MapContext();

// Now evaluate the expression, getting the result
driver.findElement((By)e.evaluate(jc));