StringToken.java

/*
  * This file is part of WhereYouGo.
  *
  * WhereYouGo is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * WhereYouGo is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with WhereYouGo.  If not, see <http://www.gnu.org/licenses/>.
  *
  * Copyright (C) 2012 Menion <whereyougo@asamm.cz>
  */ 

package menion.android.whereyougo.utils;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.NoSuchElementException;

public class StringToken implements Enumeration<Object> {

    private String string;

    private String delimiters;

    private int position;

    public static ArrayList<String> parse(String data, String delimiters, ArrayList<String> tokens) {
    	// replace delimiters in token to receive correct item count
    	data = data.replace(delimiters, " " + delimiters);
    	StringToken token = new StringToken(data, delimiters);
    	while (token.hasMoreTokens()) {
    		tokens.add(token.nextToken().trim());
    	}
    	return tokens;
    }
    
    public static ArrayList<String> parse(String data, String delimiters) {
    	return parse(data, delimiters, new ArrayList<String>());
    }
    
    /**
     * Constructs a new {@code StringTokenizer} for the parameter string using
     * the specified delimiters. The {@code returnDelimiters} flag is set to
     * {@code false}. If {@code delimiters} is {@code null}, this constructor
     * doesn't throw an {@code Exception}, but later calls to some methods might
     * throw a {@code NullPointerException}.
     *
     * @param string
     *            the string to be tokenized.
     * @param delimiters
     *            the delimiters to use.
     */
    public StringToken(String string, String delimiters) {
        if (string != null) {
            this.string = string;
            this.delimiters = delimiters;
            this.position = 0;
        } else
            throw new NullPointerException();
    }


    /**
     * Returns the number of unprocessed tokens remaining in the string.
     *
     * @return number of tokens that can be retreived before an {@code
     *         Exception} will result from a call to {@code nextToken()}.
     */
    public int countTokens() {
        int count = 0;
        boolean inToken = false;
        for (int i = position, length = string.length(); i < length; i++) {
            if (delimiters.indexOf(string.charAt(i), 0) >= 0) {
                if (inToken) {
                    count++;
                    inToken = false;
                }
            } else {
                inToken = true;
            }
        }
        if (inToken)
            count++;
        return count;
    }

    /**
     * Returns {@code true} if unprocessed tokens remain.
     *
     * @return {@code true} if unprocessed tokens remain.
     */
    public boolean hasMoreTokens() {
        if (delimiters == null) {
            throw new NullPointerException();
        }
        int length = string.length();
        if (position < length) {
            for (int i = position; i < length; i++)
                if (delimiters.indexOf(string.charAt(i), 0) == -1)
                    return true;
        }
        return false;
    }

    /**
     * Returns the next token in the string as an {@code Object}. This method is
     * implemented in order to satisfy the {@code Enumeration} interface.
     *
     * @return next token in the string as an {@code Object}
     * @throws NoSuchElementException
     *                if no tokens remain.
     */
    public Object nextElement() {
        return nextToken();
    }

    /**
     * Returns the next token in the string as a {@code String}.
     *
     * @return next token in the string as a {@code String}.
     * @throws NoSuchElementException
     *                if no tokens remain.
     */
    public String nextToken() {
        if (delimiters == null) {
            throw new NullPointerException();
        }
        int i = position;
        int length = string.length();

        if (i < length) {
            while (i < length && delimiters.indexOf(string.charAt(i), 0) >= 0)
                i++;
            position = i;
            if (i < length) {
                for (position++; position < length; position++)
                    if (delimiters.indexOf(string.charAt(position), 0) >= 0)
                        return string.substring(i, position);
                return string.substring(i);
            }
        }
        throw new NoSuchElementException();
    }

	@Override
	public boolean hasMoreElements() {
		return hasMoreTokens();
	}
}