question: ParseNode parseExpr ( Entry inEntry ) throws ConfigurationException , IOException { List nodes = new ArrayList ( ) ; for ( ; ; ) { nodes . add ( parseSubExpr ( inEntry ) ) ; if ( st . nextToken ( ) != '+' ) { st . pushBack ( ) ; break ; } } if ( nodes . size ( ) == 1 ) { return ( ParseNode ) nodes . get ( 0 ) ; } else { return new StringConcatenation ( ( ParseNode [ ] ) nodes . toArray ( new ParseNode [ nodes . size ( ) ] ) , st . lineno ( ) ) ; } }
target:  Parses a string concatenation