/*
 * Copyright 2007 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package com.sun.media.sound;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.Soundbank;
import javax.sound.midi.spi.SoundbankReader;

/**
 * JarSoundbankReader is used to read sounbank object from jar files.
 *
 * @author Karl Helgason
 */
public class JARSoundbankReader extends SoundbankReader {

    public boolean isZIP(URL url) {
        boolean ok = false;
        try {
            InputStream stream = url.openStream();
            try {
                byte[] buff = new byte[4];
                ok = stream.read(buff) == 4;
                if (ok) {
                    ok =  (buff[0] == 0x50
                        && buff[1] == 0x4b
                        && buff[2] == 0x03
                        && buff[3] == 0x04);
                }
            } finally {
                stream.close();
            }
        } catch (IOException e) {
        }
        return ok;
    }

    public Soundbank getSoundbank(URL url)
            throws InvalidMidiDataException, IOException {
        if (!isZIP(url))
            return null;
        ArrayList<Soundbank> soundbanks = new ArrayList<Soundbank>();
        URLClassLoader ucl = URLClassLoader.newInstance(new URL[]{url});
        InputStream stream = ucl.getResourceAsStream(
                "META-INF/services/javax.sound.midi.Soundbank");
        if (stream == null)
            return null;
        BufferedReader r = new BufferedReader(new InputStreamReader(stream));
        String line = r.readLine();
        while (line != null) {
            if (!line.startsWith("#")) {
                try {
                    Class c = Class.forName(line.trim(), true, ucl);
                    Object o = c.newInstance();
                    if (o instanceof Soundbank) {
                        soundbanks.add((Soundbank) o);
                    }
                } catch (Exception e) {
                    //e.printStackTrace();
                }
            }
            line = r.readLine();
        }
        stream.close();
        if (soundbanks.size() == 0)
            return null;
        if (soundbanks.size() == 1)
            return soundbanks.get(0);
        SimpleSoundbank sbk = new SimpleSoundbank();
        for (Soundbank soundbank : soundbanks)
            sbk.addAllInstruments(soundbank);
        return sbk;
    }

    public Soundbank getSoundbank(InputStream stream)
            throws InvalidMidiDataException, IOException {
        return null;
    }

    public Soundbank getSoundbank(File file)
            throws InvalidMidiDataException, IOException {
        return getSoundbank(file.toURI().toURL());
    }
}