Subversion Repositories mkgmap

/*
 * Copyright (C) 2007,2014 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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 General Public License for more details.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 14-Jan-2007
 */
package uk.me.parabola.imgfmt.app.labelenc;

/**
 * Holds the bytes and length of an encoded character string used in a label.
 * The length of the byte array may be longer than the part that is actually
 * used, so the length property should always be used.
 *
 * Class is immutable.
 *
 * @author Steve Ratcliffe
 */
public class EncodedText {
        private final int hashCode;
        private final byte[] ctext;
        private final int length;
        private final char[] chars;

        public EncodedText(byte[] buf, int len, char[] chars) {
                this.ctext = buf;
                this.length = len;
                this.chars = chars;

                assert chars == null || chars.length == 0 || chars[chars.length - 1] != 0 : "found trailing 0 in chars";
                int hc = 0;
                for (int i = 0; i < length; i++)
                        hc = 31*hc + ctext[i];
                hashCode = hc;
        }

        public byte[] getCtext() {
                return ctext;
        }

        public int getLength() {
                return length;
        }

        public char[] getChars() {
                return chars;
        }

        public boolean equals(Object o) {
                if (this == o) return true;
                if (o == null || getClass() != o.getClass()) return false;

                EncodedText that = (EncodedText) o;

                if (length != that.length) return false;
                for (int i = 0; i < length; i++)
                        if (ctext[i] != that.ctext[i])
                                return false;

                return true;
        }

        public int hashCode() {
                return hashCode;
        }
}