private String toString(Token t) {
		if (t.getKind().hasPayload()) {
			return t.stringValue();
		}
		else {
			return new String(t.kind.getTokenChars());
		}
	}
Return the concatenation of the data of many tokens.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/dsl/StreamConfigParser.java