question: protected Node stringConversion ( Node node ) { TypeElement stringElement = elements . getTypeElement ( "java.lang.String" ) ; if ( ! TypesUtils . isString ( node . getType ( ) ) ) { Node converted = new StringConversionNode ( node . getTree ( ) , node , stringElement . asType ( ) ) ; addToConvertedLookupMap ( converted ) ; insertNodeAfter ( converted , node ) ; return converted ; } else { return node ; } }
target:  Convert the input node to String type, if it isn't already.