/**
 * JEBML - Java library to read/write EBML/Matroska elements.
 * Copyright (C) 2004 Jory Stone <jebml@jory.info>
 * Based on Javatroska (C) 2002 John Cannon <spyder@matroska.org>
 * 
 * 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.jcodec.containers.mkv.ebml;


/**
 * Baisc class for handling an EBML string data type. This class encapsulates
 * both UTF and ASCII string types and can use any string type supported by the
 * Java platform.
 * 
 * @author John Cannon
 */
public class StringElement extends BinaryElement {

    private String charset = "UTF-8";

    /** Creates a new instance of StringElement */
    public StringElement(byte[] typeID) {
        super(typeID);
    }

    public StringElement(byte[] typeID, String encoding) {
        super(typeID);
        charset = encoding;
    }

    private boolean checkForCharsetHack() {
        // Check if we are trying to read UTF-8, if so lets try UTF8.
        // Microsofts Java supports "UTF8" but not "UTF-8"
        if (charset.compareTo("UTF-8") == 0) {
            charset = "UTF8";
            // Let's try again
            return true;
        } else if (charset.compareTo("US-ASCII") == 0) {
            // This is the same story as UTF-8,
            // If Microsoft is going to hijack Java they should at least support
            // the orignal :>
            charset = "ASCII";
            // Let's try again
            return true;
        }
        return false;
    }

    public String get() {
        try {
            if (data == null)
                throw new java.lang.IllegalStateException("Call readData() before trying to extract the string value.");

            
            return new String(data.array(), charset);
        } catch (java.io.UnsupportedEncodingException ex) {
            if (checkForCharsetHack()) {
                return get();
            }
            ex.printStackTrace();
            return "";
        }
    }

    public void set(String value) {
        try {
            setData(value.getBytes(charset));
        } catch (java.io.UnsupportedEncodingException ex) {
            if (checkForCharsetHack()) {
                set(value);
                return;
            }
            ex.printStackTrace();
        }
    }

    public String getEncoding() {
        return charset;
    }

}