gecko-dev/grendel/storage/ParseBerkeleyFolderWithSumm...

157 строки
5.3 KiB
Java

/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1997 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Created: Jamie Zawinski <jwz@netscape.com>, 27 Sep 1997.
*/
package grendel.storage;
import calypso.util.Assert;
import calypso.util.ByteBuf;
import java.io.File;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.RandomAccessFile;
import java.io.IOException;
import java.io.FileNotFoundException;
class ParseBerkeleyFolderWithSummary extends ParseBerkeleyFolder {
synchronized void mapOverMessages(RandomAccessFile infile, BerkeleyFolder f)
throws IOException {
fFolder = f;
long file_date = f.fFile.lastModified();
long file_size = f.fFile.length();
total_message_count = 0; // super.recordOne() updates these.
undeleted_message_count = 0;
unread_message_count = 0;
deleted_message_bytes = 0;
long summarized_length = readSummaryFile(f);
if (summarized_length != file_size) {
mapOverMessages(infile, f, summarized_length);
if (summarized_length == 0)
System.err.println("summary file was missing or out of sync; " +
"marking folder \"" + f.getName() + "\" dirty.");
else
System.err.println("more messages in folder than summary file; " +
"marking folder \"" + f.getName() + "\" dirty.");
if (f.mailSummaryFile != null) {
// We actually read a summary file: since we also read some messages,
// update the dates in the summary file *now*, so that when this
// summary object is *later* used to rewrite the summary file (and
// include the new messages) the date/size that get written into the
// new summary file will correspond to the time we actually parsed
// the folder (as opposed to the time at which we wrote the summary.)
f.mailSummaryFile.setFolderDateAndSize(file_date, file_size);
// Also update the message counts, in case we parsed some more messages
// beyond what the summary file told us about.
f.mailSummaryFile.setFolderMessageCounts(total_message_count,
undeleted_message_count,
unread_message_count,
deleted_message_bytes);
}
f.setSummaryDirty(true);
}
// If something went wrong while parsing the summary file, it might want
// to tweak some of the messages that were actually parsed from the file,
// based on whatever attrocities it saw in the (broken or out of date)
// summary, before parsing failed for whatever reason.
if (f.mailSummaryFile != null)
f.mailSummaryFile.salvageMessages();
}
/** Reads opens the summary file, if any, associated with the folder,
and if it is in the proper format and otherwise up to date,
parses it (by calling MailSummaryFile.readSummaryFile().)
Stores a MailSummaryFile into the folder. Returns the number of
bytes which the summary file had summarized.
@see MailSummaryFileFactory
@see MailSummaryFile
@see MailSummaryFileCheddar
@see MailSummaryFileGrendel
*/
protected synchronized long readSummaryFile(BerkeleyFolder f) {
long result = 0;
InputStream sum = null;
f.mailSummaryFile = null;
try { // make sure sum is closed.
sum = openSummaryFile(f);
if (sum != null) {
try { // catch IOException
MailSummaryFile reader =
MailSummaryFileFactory.ParseFileHeader(f, sum);
if (reader != null) {
result = reader.readSummaryFile(sum);
f.mailSummaryFile = reader;
total_message_count = reader.totalMessageCount();
undeleted_message_count = reader.undeletedMessageCount();
unread_message_count = reader.unreadMessageCount();
deleted_message_bytes = reader.deletedMessageBytes();
}
} catch (IOException e) {
// System.err.println("exception while reading summary file: " + e);
}
}
} finally {
if (sum != null) {
try { sum.close(); }
catch (IOException e) { }
}
}
return result;
}
protected InputStream openSummaryFile(BerkeleyFolder folder) {
try {
File sum = folder.summaryFileName();
InputStream result = new BufferedInputStream(new FileInputStream(sum));
System.err.println("opened summary file " + sum);
return result;
} catch (SecurityException e) {
return null;
} catch (FileNotFoundException e) {
return null;
}
}
}