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HSQLDB example source code file (ZipUnzipFile.java)

This example HSQLDB source code file (ZipUnzipFile.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

copy_block_size, copy_block_size, deflateroutputstream, fileaccess, fileoutputstream, inflaterinputstream, inputstream, io, ioexception, ioexception, outputstream, string, string, throwable, throwable, zip

The HSQLDB ZipUnzipFile.java source code

/*
 * For work developed by the HSQL Development Group:
 *
 * Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *
 * For work originally developed by the Hypersonic SQL Group:
 *
 * Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 */


package org.hsqldb.lib;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

// oj@openoffice.org - patch 1.8.0 - use FileAccess

/**
 *
 * New Class based on original Hypersonic code.
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.2
 * @since Hypersonic SQL
 */
public class ZipUnzipFile {

    private static final int COPY_BLOCK_SIZE = 1 << 16;

    public static void compressFile(String infilename, String outfilename,
                                    FileAccess storage) throws IOException {

        InputStream          in        = null;
        DeflaterOutputStream f         = null;
        OutputStream         outstream = null;
        boolean              completed = false;

        // if there is no file
        if (!storage.isStreamElement(infilename)) {
            return;
        }

        try {
            byte[] b = new byte[COPY_BLOCK_SIZE];

            in        = storage.openInputStreamElement(infilename);
            outstream = storage.openOutputStreamElement(outfilename);
            f = new DeflaterOutputStream(outstream,
                                         new Deflater(Deflater.BEST_SPEED),
                                         COPY_BLOCK_SIZE);

            while (true) {
                int l = in.read(b, 0, COPY_BLOCK_SIZE);

                if (l == -1) {
                    break;
                }

                f.write(b, 0, l);
            }

            completed = true;
        } catch (Throwable e) {
            throw FileUtil.toIOException(e);
        } finally {
            try {
                if (in != null) {
                    in.close();
                }

                if (f != null) {
                    f.finish();    // reported to be missing from close() in some JRE libs

                    if (outstream instanceof FileOutputStream) {
                        storage.getFileSync(outstream).sync();
                    }

                    f.close();
                }

                if (!completed && storage.isStreamElement(outfilename)) {
                    storage.removeElement(outfilename);
                }
            } catch (Throwable e) {
                throw FileUtil.toIOException(e);
            }
        }
    }

    public static void decompressFile(String infilename, String outfilename,
                                      FileAccess storage) throws IOException {

        InflaterInputStream f         = null;
        OutputStream        outstream = null;
        boolean             completed = false;

        try {
            if (!storage.isStreamElement(infilename)) {
                return;
            }

            storage.removeElement(outfilename);

            f = new InflaterInputStream(
                storage.openInputStreamElement(infilename), new Inflater());
            outstream = storage.openOutputStreamElement(outfilename);

            byte[] b = new byte[COPY_BLOCK_SIZE];

            while (true) {
                int l = f.read(b, 0, COPY_BLOCK_SIZE);

                if (l == -1) {
                    break;
                }

                outstream.write(b, 0, l);
            }

            completed = true;
        } catch (Throwable e) {
            throw FileUtil.toIOException(e);
        } finally {
            try {
                if (f != null) {
                    f.close();
                }

                if (outstream != null) {
                    outstream.flush();

                    if (outstream instanceof FileOutputStream) {
                        storage.getFileSync(outstream).sync();
                    }

                    outstream.close();
                }

                if (!completed && storage.isStreamElement(outfilename)) {
                    storage.removeElement(outfilename);
                }
            } catch (Throwable e) {
                throw FileUtil.toIOException(e);
            }
        }
    }
}

Other HSQLDB examples (source code examples)

Here is a short list of links related to this HSQLDB ZipUnzipFile.java source code file:

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