archivefileconstants.java

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/* $Id: ArchiveFileConstants.java 4620 2006-09-12 19:41:23Z stack-sf $
 *
 * Created on August 16th, 2006.
 *
 * Copyright (C) 2006 Internet Archive.
 *
 * This file is part of the Heritrix web crawler (crawler.archive.org).
 *
 * Heritrix is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * any later version.
 *
 * Heritrix 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 Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with Heritrix; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.archive.io;

/**
 * Constants used by Archive files and in Archive file processing.
 * @author stack
 * @version $Date: 2006-09-12 19:41:23 +0000 (Tue, 12 Sep 2006) $ $Revision: 4620 $
 */
public interface ArchiveFileConstants {
    /**
     * Suffix given to files currently in use.
     */
    public static final String OCCUPIED_SUFFIX = ".open";
    
    /**
     * Suffix appended to 'broken' files.
     */
    public static final String INVALID_SUFFIX = ".invalid";
    
    /**
     * Compressed file extention.
     */
    public static final String COMPRESSED_FILE_EXTENSION = "gz";
    
    /**
     * Dot plus compressed file extention.
     */
    public static final String DOT_COMPRESSED_FILE_EXTENSION = "." +
        COMPRESSED_FILE_EXTENSION;
    
    /**
     * Key for the Archive File version field.
     */
    public static final String VERSION_FIELD_KEY = "version";
    
    /**
     * Key for the Archive File length field.
     */
    public static final String LENGTH_FIELD_KEY = "length";
    
    /**
     * Key for the Archive File type field.
     */
    public static final String TYPE_FIELD_KEY = "type";
    
    /**
     * Key for the Archive File URL field.
     */
    public static final String URL_FIELD_KEY = "subject-uri";
    
    /**
     * Key for the Archive File Creation Date field.
     */
    public static final String DATE_FIELD_KEY = "creation-date";

    /**
     * Key for the Archive File mimetype field.
     */
    public static final String MIMETYPE_FIELD_KEY = "content-type";
    
    /**
     * Key for the Archive File record field.
     */
    public static final String RECORD_IDENTIFIER_FIELD_KEY =
    	"record-identifier";
    
    /**
     * Key for the Archive Record absolute offset into Archive file.
     */
    public static final String ABSOLUTE_OFFSET_KEY = "absolute-offset";
    
    public static final String READER_IDENTIFIER_FIELD_KEY =
    	"reader-identifier";
    
    /**
     * Size used to preallocate stringbuffer used outputting a cdx line.
     * The numbers below are guesses at sizes of each of the cdx fields.
     * The ones in the below are spaces. Here is the legend used outputting
     * the cdx line: CDX b e a m s c V n g.  Consult cdx documentation on
     * meaning of each of these fields.
     */
    public static final int CDX_LINE_BUFFER_SIZE = 14 + 1 + 15 + 1 + 1024 +
        1 + 24 + 1 + + 3 + 1 + 32 + 1 + 20 + 1 + 20 + 1 + 64;
    
    public static final String DEFAULT_DIGEST_METHOD = "SHA-1";
    
    public static final char SINGLE_SPACE = ' ';
    
    public static final String CRLF = "\r\n";
    
    public static final String CDX = "cdx";
    public static final String DUMP = "dump";
    public static final String GZIP_DUMP = "gzipdump";
    public static final String HEADER = "header";
    public static final String NOHEAD = "nohead";
    public static final String CDX_FILE = "cdxfile";
}