How to convert String to GString and replace placeholder in Groovy?

Question

I want to read a String from database and replace the placeholder by converting it to a GString. Can I do this with Eval? Any other ideas?

String stringFromDatabase = 'Hello ${name}!'
String name = 'world'

assert 'Hello world!'== TODO

Answer 1

You can use the Template framework in Groovy, so doing this solves your problem:

String stringFromDatabase = 'Hello ${name}!'
String name = 'world'

def engine = new groovy.text.SimpleTemplateEngine()
assert 'Hello world!'== engine.createTemplate(stringFromDatabase).make([name:name]).toString()

You can find the docs here: http://docs.groovy-lang.org/latest/html/documentation/template-engines.html#_introduction

The GString class is abstract, and the GStringImpl implementation of the abstract class works on the arrays of strings, that it gets from the parsing phase along with values.

Answer 2

I solved this with Eval:

String stringFromDatabase = 'Hello ${name}!'
String name = 'world'

assert 'Hello world!' == Eval.me('name', name, '"' + stringFromDatabase + '"')