/*

 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.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 java.util.Objects;

import javax.sound.midi.InvalidMidiDataException;

import javax.sound.midi.Soundbank;

import javax.sound.midi.spi.SoundbankReader;

import sun.reflect.misc.ReflectUtil;

/**

 * JarSoundbankReader is used to read soundbank object from jar files.

 *

 * @author Karl Helgason

 */

public final class JARSoundbankReader extends SoundbankReader {

    private static 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;

        try

        {

            BufferedReader r = new BufferedReader(new InputStreamReader(stream));

            String line = r.readLine();

            while (line != null) {

                if (!line.startsWith("#")) {

                    try {

                        Class<?> c = Class.forName(line.trim(), false, ucl);

                        if (Soundbank.class.isAssignableFrom(c)) {

                            Object o = ReflectUtil.newInstance(c);

                            soundbanks.add((Soundbank) o);

                        }

                    } catch (ClassNotFoundException ignored) {

                    } catch (InstantiationException ignored) {

                    } catch (IllegalAccessException ignored) {

                    }

                }

                line = r.readLine();

            }

        }

        finally

        {

            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 {

        Objects.requireNonNull(stream);

        return null;

    }

    public Soundbank getSoundbank(File file)

            throws InvalidMidiDataException, IOException {

        return getSoundbank(file.toURI().toURL());

    }

}