package strings;

import java.util.StringTokenizer;

/** Show using a StringTokenizer including getting the delimiters back */
public class StrTokDemo4 {
	public final static int MAXFIELDS = 5;
	public final static String DELIM = "|";

	/** Processes one String, returns it as an array of Strings */
	public static String[] process(String line) {
		String[] results = new String[MAXFIELDS];

		// Unless you ask StringTokenizer to give you the tokens,
		// it silently discards multiple null tokens.
		StringTokenizer st = new StringTokenizer(line, DELIM, true);

		int i = 0;
		// stuff each token into the current slot in the array.
		while (st.hasMoreTokens()) {
			String s = st.nextToken();
			if (s.equals(DELIM)) {
				if (i++>=MAXFIELDS)
					// This is messy: See StrTokDemo4b which uses 
					// a List to allow any number of fields.
					throw new IllegalArgumentException("Input line " +
						line + " has too many fields");
				continue;
			}
			results[i] = s;
		}
		return results;
	}

	public static void printResults(String input, String[] outputs) {
		System.out.println("Input: " + input);
		for (int i=0; i<outputs.length; i++)
			System.out.println("Output " + i + " was: " + outputs[i]);
	}

	public static void main(String[] a) {
		printResults("A|B|C|D", process("A|B|C|D"));
		printResults("A||C|D", process("A||C|D"));
		printResults("A|||D|E", process("A|||D|E"));
	}
}