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

Question

I want to read String from a database and replace the placeholder by translating it to 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 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 documents here: http://docs.groovy-lang.org/latest/html/documentation/template-engines.html#_introduction

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

Answer 2

You must use a double-quoted string literal if you want to use placeholders.

The following should work:

 String name = 'world' String stringFromDatabase = "Hello ${name}!" //use double quotes assert 'Hello world!' == stringFromDatabase 

See the official Groovy String documentation for other ways you can do this.