UnknownHohmException.java

/*
 *  titl - Tools for iTunes Libraries
 *  Copyright (C) 2008-2011 Joseph Walton
 *
 *  This program 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 <http://www.gnu.org/licenses/>.
 */

package org.kafsemo.titl;

/**
 * An unknown hohm type was encountered. This exception includes
 * the contents to give a clue to the data.
 */
public class UnknownHohmException extends ItlException
{
    private final int hohmType;
    private final byte[] contents;

    public UnknownHohmException(int hohmType, byte[] contents)
    {
        super(null);
        this.hohmType = hohmType;
        this.contents = contents;
    }

    @Override
    public String getMessage()
    {
        StringBuilder sb = new StringBuilder();
        sb.append("Unknown type: ");
        sb.append(hohmType);
        sb.append(String.format(" (0x%X)", hohmType));

        int len = Math.min(contents.length, 64);

        /* Hex */
        sb.append('\n');
        sb.append("Hex:");
        for(int i = 0; i < len; i++) {
            sb.append(' ');
            sb.append(String.format("0x%02X", contents[i] & 0xFF));
        }
        
        if (len < contents.length) {
            sb.append(" ...");
        }
        
        len = Math.min(contents.length, 96);
        
        /* ASCII */
        sb.append('\n');
        sb.append("ASCII: ");
        for (int i = 0; i < len; i++) {
            /* Only show printable ASCII characters */
            int c = contents[i] & 0xFF;
            if ((c >= 0x20) && (c <= 0x7E)) {
                sb.append((char) c);
            } else {
                sb.append('.');
            }
        }

        if (len < contents.length) {
            sb.append(" ...");
        }

        return sb.toString();
    }
}