@Override
	public String toString() {
		StringBuilder s = new StringBuilder();
		s.append(tokenStream).append("\n");
		s.append("tokenStreamPointer=" + tokenStreamPointer).append("\n");
		return s.toString();
	}
Return the concatenation of the data of many tokens.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/dsl/StreamConfigParser.java