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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.zip;

import de.schlichtherle.truezip.util.JSE7;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;
import static java.util.zip.Deflater.DEFAULT_COMPRESSION;
import java.util.zip.DeflaterOutputStream;

/**
 * A deflater output stream which uses a custom {@link Deflater} and provides
 * access to it.
 * 
 * @author  Christian Schlichtherle
 */
final class ZipDeflaterOutputStream extends DeflaterOutputStream {

    private static final DeflaterFactory factory = JSE7.AVAILABLE
                        ? new DeflaterFactory()        // JDK 7 is OK
                        : new Jdk6DeflaterFactory();   // JDK 6 needs fixing

    ZipDeflaterOutputStream(OutputStream out, int level, int size) {
        super(out, factory.newDeflater(), size);
        def.setLevel(level);
    }

    Deflater getDeflater() {
        return def;
    }

    @Override
    public void close() throws IOException {
        assert false : "This method should never get called by the current implementation.";
        def.end();
        super.close();
    }

    /** A factory for {@link Deflater} objects. */
    private static class DeflaterFactory {
        protected Deflater newDeflater() {
            return new Deflater(DEFAULT_COMPRESSION, true);
        }
    }

    /** A factory for {@link Jdk6Deflater} objects. */
    private static final class Jdk6DeflaterFactory extends DeflaterFactory {
        @Override
        protected Deflater newDeflater() {
            return new Jdk6Deflater(DEFAULT_COMPRESSION, true);
        }
    }
}