Subversion Repositories mkgmap

/*
 * Copyright (C) 2007 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;

import java.nio.charset.Charset;

import uk.me.parabola.log.Logger;

/**
 * Useful routines for the other encoders.
 * Provides some default behaviour when a conversion is not possible for
 * example.
 *
 * @author Steve Ratcliffe
 */
public class BaseEncoder {
        private static final Logger log = Logger.getLogger(BaseEncoder.class);

        public static final EncodedText NO_TEXT = new EncodedText(null, 0, null);

        private boolean charsetSupported = true;

        // Whether to uppercase the labels or not.  Default is true because many
        // GPS devices do not display labels in lower case.
        private boolean upperCase;

        protected boolean isCharsetSupported() {
                return charsetSupported;
        }

        protected void prepareForCharacterSet(String name) {
                if (Charset.isSupported(name)) {
                        charsetSupported = true;
                } else {
                        charsetSupported = false;
                        log.warn("requested character set not found " + name);
                }
        }

        protected EncodedText simpleEncode(String text) {
                if (text == null)
                        return NO_TEXT;
               
                char[] in = text.toCharArray();
                byte[] out = new byte[in.length + 1];

                int off = 0;
                for (char c : in)
                        out[off++] = (byte) (c & 0xff);

                return new EncodedText(out, out.length, in);
        }

        public boolean isUpperCase() {
                return upperCase;
        }

        public void setUpperCase(boolean upperCase) {
                this.upperCase = upperCase;
        }
}