Package com.healthmarketscience.jackcess.crypt.impl

Class DbFileRewriter

java.lang.Object

com.healthmarketscience.jackcess.crypt.impl.DbFileRewriter

public class DbFileRewriter
extends Object

Runs a whole file rewrite of a database, and holds the page level file work the rewrites share. Adding or removing encryption touches every page and cannot be undone half way, so the work always builds a separate file and the original is replaced only once that file is complete. An interrupted rewrite leaves the original as it was.

Author:

James Ahlborn

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	DbFileRewriter.Rewrite	The work one rewrite performs, reading the source database and writing the destination.

Method Summary

Modifier and Type	Method	Description
static void	rewriteInPlace(Path dbFile, DbFileRewriter.Rewrite op)	Rewrites the given database in place, replacing it with the result.
static void	rewriteTo(Path srcFile, Path dstFile, DbFileRewriter.Rewrite op)	Rewrites the given database into the given destination, which must not be the source and is overwritten if it exists.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

rewriteTo

public static void rewriteTo(Path srcFile,
                             Path dstFile,
                             DbFileRewriter.Rewrite op)
                      throws IOException

Rewrites the given database into the given destination, which must not be the source and is overwritten if it exists.

Throws:

IOException

rewriteInPlace

public static void rewriteInPlace(Path dbFile,
                                  DbFileRewriter.Rewrite op)
                           throws IOException

Rewrites the given database in place, replacing it with the result.

The replacement gives the database a new identity on disk, so any hard link to it keeps the contents the rewrite started with, and an open handle on it keeps reading the old file. The database must not be in use.

Throws:

IOException