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 * All rights reserved.
 *
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 * 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
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package org.hsqldb.lib.tar;

import java.io.File;
import java.io.IOException;

public class DbBackupMain {

Command line invocation to create, examine, or extract HSQLDB database
backup tar archives.

This class stores tar entries as relative files without specifying
parent directories, in what is commonly referred to as tar bomb
format.
The set of files is small, with known extensions, and the potential
inconvenience of messing up the user's current directory is more than
compensated by making it easier for the user to restore to a new
database URL location at a peer level to the original.

Automatically calculates buffer sizes based on the largest component
file (for "save" mode) or tar file size (for other modes).

Run

    java -cp path/to/hsqldb.jar org.hsqldb.lib.tar.DbBackupMain
 for syntax help.
Params:
sa – The arguments
Throws:
IOException – on read-write error
TarMalformatException – on tar file problems/**
 * Command line invocation to create, examine, or extract HSQLDB database
 * backup tar archives.
 * <P>
 * This class stores tar entries as relative files without specifying
 * parent directories, in what is commonly referred to as <I>tar bomb</I>
 * format.
 * The set of files is small, with known extensions, and the potential
 * inconvenience of messing up the user's current directory is more than
 * compensated by making it easier for the user to restore to a new
 * database URL location at a peer level to the original.
 * <P>
 * Automatically calculates buffer sizes based on the largest component
 * file (for "save" mode) or tar file size (for other modes).
 * <P>
 * Run<PRE><CODE>
 *     java -cp path/to/hsqldb.jar org.hsqldb.lib.tar.DbBackupMain
 * </CODE></PRE> for syntax help.
 *
 * @param sa The arguments
 * @throws IOException on read-write error
 * @throws TarMalformatException on tar file problems
 *
 */
    public static void main(String[] sa)
    throws IOException, TarMalformatException {

        try {
            if (sa.length < 1) {
                System.out.println(
                    RB.DbBackup_syntax.getString(DbBackup.class.getName()));
                System.out.println();
                System.out.println(RB.listing_format.getString());
                System.exit(0);
            }

            if (sa[0].equals("--save")) {
                boolean overWrite = sa.length > 1
                                    && sa[1].equals("--overwrite");

                if (sa.length != (overWrite ? 4
                                            : 3)) {
                    throw new IllegalArgumentException();
                }

                DbBackup backup = new DbBackup(new File(sa[sa.length - 2]),
                                               sa[sa.length - 1]);

                backup.setOverWrite(overWrite);
                backup.write();
            } else if (sa[0].equals("--list")) {
                if (sa.length < 2) {
                    throw new IllegalArgumentException();
                }

                String[] patternStrings = null;

                if (sa.length > 2) {
                    patternStrings = new String[sa.length - 2];

                    for (int i = 2; i < sa.length; i++) {
                        patternStrings[i - 2] = sa[i];
                    }
                }

                new TarReader(new File(sa[1]), TarReader
                    .LIST_MODE, patternStrings, Integer.valueOf(DbBackup
                        .generateBufferBlockValue(new File(sa[1]))), null)
                            .read();
            } else if (sa[0].equals("--extract")) {
                boolean overWrite = sa.length > 1
                                    && sa[1].equals("--overwrite");
                int firstPatInd = overWrite ? 4
                                            : 3;

                if (sa.length < firstPatInd) {
                    throw new IllegalArgumentException();
                }

                String[] patternStrings = null;

                if (sa.length > firstPatInd) {
                    patternStrings = new String[sa.length - firstPatInd];

                    for (int i = firstPatInd; i < sa.length; i++) {
                        patternStrings[i - firstPatInd] = sa[i];
                    }
                }

                File tarFile       = new File(sa[overWrite ? 2
                                                           : 1]);
                int  tarReaderMode = overWrite ? TarReader.OVERWRITE_MODE
                                               : TarReader.EXTRACT_MODE;

                new TarReader(
                    tarFile, tarReaderMode, patternStrings,
                    Integer.valueOf(DbBackup.generateBufferBlockValue(tarFile)),
                    new File(sa[firstPatInd - 1])).read();
            } else {
                throw new IllegalArgumentException();
            }
        } catch (IllegalArgumentException iae) {
            System.out.println(
                RB.DbBackup_syntaxerr.getString(DbBackup.class.getName()));
            System.exit(2);
        }
    }
}