ListUtils.java

/*-
 * Copyright © 2010 Diamond Light Source Ltd.
 *
 * This file is part of GDA.
 *
 * GDA is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License version 3 as published by the Free
 * Software Foundation.
 *
 * GDA 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 GDA. If not, see <http://www.gnu.org/licenses/>.
 */

package uk.ac.gda.util.list;

import java.util.ArrayList;
import java.util.List;

public class ListUtils {

	/**
	 *
	 * @param value
	 * @return v
	 */
	public static String getString(final List<String> value) {
		if (value == null)   return null;
		if (value.isEmpty()) return null;
		final String line = value.toString();
		return line.substring(1,line.length()-1);
	}

	/**
	 *
	 * @param value
	 * @return v
	 */
	public static List<String> getList(final String value) {
		if (value == null)           return null;
		if ("".equals(value.trim())) return null;
		final String[]    vals = value.split(",");
		final List<String> ret = new ArrayList<String>(vals.length);
		for (int i = 0; i < vals.length; i++) ret.add(vals[i].trim());
		return ret;
	}

	public static void main(String[] args) {
		String test = "one,two,three";
		List<String> v = getList(test);
		System.out.println(v);

		test = " ";
		v = getList(test);
		System.out.println(v);

		test = null;
		v = getList(test);
		System.out.println(v);

		test = ",";
		v = getList(test);
		System.out.println(v);

		test = ",,";
		v = getList(test);
		System.out.println(v);

		test = ",,)";
		v = getList(test);
		System.out.println(v);

	}
}