FileMemData

This class contains the data of an in-memory random access file. Data compression using the LZF algorithm is supported as well.

Methods
boolean	canWrite() Check whether writing is allowed.
boolean	canWrite() Check whether writing is allowed. Returns: true if it is
void	compress(int page) Compress the data in a byte array.
void	compress(int page) Compress the data in a byte array. Parameters: page - which page to compress
int	getId()
int	getId()
long	getLastModified() Get the last modified time.
long	getLastModified() Get the last modified time. Returns: the time
String	getName() Get the file name
String	getName() Get the file name Returns: the name
byte[]	getPage(int page) Get the page if it exists.
byte[]	getPage(int page) Get the page if it exists. Parameters: page - the page id Returns: the byte array, or null
long	length() Get the file length.
long	length() Get the file length. Returns: the length
boolean	lockExclusive() Lock the file in exclusive mode if possible.
boolean	lockExclusive() Lock the file in exclusive mode if possible. Returns: if locking was successful
boolean	lockShared() Lock the file in shared mode if possible.
boolean	lockShared() Lock the file in shared mode if possible. Returns: if locking was successful
long	readWrite(long pos, byte[] b, int off, int len, boolean write) Read or write.
long	readWrite(long pos, byte[] b, int off, int len, boolean write) Read or write. Parameters: pos - the position b - the byte array off - the offset within the byte array len - the number of bytes write - true for writing Returns: the new position
void	setName(String name) Set the file name.
void	setName(String name) Set the file name. Parameters: name - the name
void	setPage(int page, byte[] oldData, byte[] newData, boolean force) Set the page data.
void	setPage(int page, byte[] oldData, byte[] newData, boolean force) Set the page data. Parameters: page - the page id oldData - the old data newData - the new data force - whether the data should be overwritten even if the old data doesn't match
boolean	setReadOnly() Set the read-only flag.
boolean	setReadOnly() Set the read-only flag. Returns: true
void	touch(boolean openReadOnly) Update the last modified time.
void	touch(boolean openReadOnly) throws IOException Update the last modified time. Parameters: openReadOnly - if the file was opened in read-only mode
void	truncate(long newLength) Truncate the file.
void	truncate(long newLength) Truncate the file. Parameters: newLength - the new length
void	unlock() Unlock the file.
void	unlock() Unlock the file.