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/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.util.serialize;

import java.io.*;

/**
 * Telenor FoU 2004
 * 
 * User: t537929
 * 
 * 
 */
public class StringHelper {
	public static byte[] persist(String str) throws IOException {
		ByteArrayOutputStream bout = new ByteArrayOutputStream();
		DataOutputStream dout = new DataOutputStream(bout);

		persist(str, dout);

		return bout.toByteArray();
	}

	public static void persist(String str, DataOutputStream dout) throws IOException {

		if (str == null) {
			dout.writeBoolean(false);
		} else {
			dout.writeBoolean(true);
			dout.writeUTF(str);
		}

		dout.flush();
	}

	public static String resurrect(DataInputStream din) throws IOException {
		if (din.readBoolean()) {
			// The String is not null
			return din.readUTF();
		} else {
			return null;
		}
	}

	public static String resurrect(byte[] data) throws IOException {
		DataInputStream din = new DataInputStream(new ByteArrayInputStream(data));

		if (din.readBoolean()) {
			// The String is not null
			return din.readUTF();
		} else {
			return null;
		}
	}
}