org.netbeans.mdr.persistence.btreeimpl.btreestorage

Class FileHeader

java.lang.Object

org.netbeans.mdr.persistence.btreeimpl.btreestorage.FileHeader

public class FileHeader
extends java.lang.Object

Files stored in the FileCache must start with this header; it contains information used by the logging system. The client of the cache should assume that the first 64 bytes of the file are reserved (64 to allow for growth). All files stored in the cache are committed together, and should always have identical file headers.

Field Summary

Fields

Modifier and Type	Field and Description
static int	HEADER_SIZE The size of the header

Method Summary

Methods

Modifier and Type	Method and Description
void	addFiles(java.lang.String[] names, int size, boolean replace) Create new files with a given header
static FileHeader	createFiles(java.lang.String[] names, int size, boolean replace) Create a set of files with a common header
boolean	equals(java.lang.Object o) test for equality with another FileHeader

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HEADER_SIZE

public static final int HEADER_SIZE

The size of the header

See Also:

Constant Field Values

Method Detail

addFiles

public void addFiles(java.lang.String[] names,
            int size,
            boolean replace)
              throws StorageException

Create new files with a given header

Parameters:

names - the names of the files

size - if greater than 0, the size to make the files

replace - if true, replace existing files. if false, throw an exception if any of the files exists

Throws:

StorageException - I/O error creating the files or "replace" was false, and a file already exists

createFiles

public static FileHeader createFiles(java.lang.String[] names,
                     int size,
                     boolean replace)
                              throws StorageException

Create a set of files with a common header

Parameters:

names - the names of the files

size - if greater than 0, the size to make the files

replace - if true, replace existing files. if false, throw an exception if any of the files exists

Returns:

the header used to create the files

Throws:

StorageException - I/O error creating the files or "replace" was false, and a file already exists

equals

public boolean equals(java.lang.Object o)

test for equality with another FileHeader

Overrides:

equals in class java.lang.Object

Parameters:

equals - compare for equality with this