/*

 * Copyright (c) 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

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 */

package jdk.tools.jlink.internal.plugins;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.util.Arrays;

import java.util.Map;

import java.util.function.Predicate;

import java.util.zip.Deflater;

import jdk.tools.jlink.internal.ResourcePoolManager;

import jdk.tools.jlink.internal.ResourcePoolManager.ResourcePoolImpl;

import jdk.tools.jlink.plugin.ResourcePool;

import jdk.tools.jlink.plugin.ResourcePoolBuilder;

import jdk.tools.jlink.plugin.ResourcePoolEntry;

import jdk.tools.jlink.plugin.Plugin;

/**

 *

 * ZIP Compression plugin

 */

public final class ZipPlugin implements Plugin {

    public static final String NAME = "zip";

    private Predicate<String> predicate;

    public ZipPlugin() {

    }

    ZipPlugin(String[] patterns) {

        this(ResourceFilter.includeFilter(Arrays.asList(patterns)));

    }

    ZipPlugin(Predicate<String> predicate) {

        this.predicate = predicate;

    }

    @Override

    public String getName() {

        return NAME;

    }

    @Override

    public Category getType() {

        return Category.COMPRESSOR;

    }

    @Override

    public String getDescription() {

        return PluginsResourceBundle.getDescription(NAME);

    }

    @Override

    public boolean hasArguments() {

        return false;

    }

    @Override

    public String getArgumentsDescription() {

        return PluginsResourceBundle.getArgument(NAME);

    }

    @Override

    public void configure(Map<String, String> config) {

        predicate = ResourceFilter.includeFilter(config.get(NAME));

    }

    static byte[] compress(byte[] bytesIn) {

        Deflater deflater = new Deflater();

        deflater.setInput(bytesIn);

        ByteArrayOutputStream stream = new ByteArrayOutputStream(bytesIn.length);

        byte[] buffer = new byte[1024];

        deflater.finish();

        while (!deflater.finished()) {

            int count = deflater.deflate(buffer);

            stream.write(buffer, 0, count);

        }

        try {

            stream.close();

        } catch (IOException ex) {

            return bytesIn;

        }

        byte[] bytesOut = stream.toByteArray();

        deflater.end();

        return bytesOut;

    }

    @Override

    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {

        in.transformAndCopy((resource) -> {

            ResourcePoolEntry res = resource;

            if (resource.type().equals(ResourcePoolEntry.Type.CLASS_OR_RESOURCE)

                    && predicate.test(resource.path())) {

                byte[] compressed;

                compressed = compress(resource.contentBytes());

                res = ResourcePoolManager.newCompressedResource(resource,

                        ByteBuffer.wrap(compressed), getName(), null,

                        ((ResourcePoolImpl)in).getStringTable(), in.byteOrder());

            }

            return res;

        }, out);

        return out.build();

    }

}