org.hsqldb.persist

Class TextCache

java.lang.Object

org.hsqldb.persist.DataFileCache

org.hsqldb.persist.TextCache

public class TextCache
extends DataFileCache

Acts as a buffer manager for a single TEXT table and its Row data.

Handles read/write operations on the table's text format data file using a compatible pair of org.hsqldb.rowio input/output class instances. fredt - This used to write rows as soon as they are inserted but now this is subject to transaction management. A memory buffer contains the rows not yet committed. Refactored for version 2.2.6.

Since:

1.7.0

Field Summary

Fields inherited from class org.hsqldb.persist.DataFileCache

FLAG_190, FLAG_HX, FLAG_ISSAVED, FLAG_ISSHADOWED, FLAG_ROWINFO, maxDataFileSize, rowOut, spaceManager

Method Summary

Modifier and Type	Method and Description
void	add(CachedObject object)
void	addInit(CachedObject object)
void	close() Writes newly created rows to disk.
CachedObject	get(CachedObject object, PersistentStore store, boolean keep) cannot use isInMemory() for text cached object
CachedObject	get(long i, PersistentStore store, boolean keep)
java.lang.String	getHeader()
int	getLineNumber()
TextFileReader	getTextFileReader()
TextFileSettings	getTextFileSettings()
boolean	isIgnoreFirstLine()
void	open(boolean readonly) Opens a data source file.
void	release() Abandons changed rows and closes the .data file.
void	remove(CachedObject object) Used when a row is deleted as a result of some DML or DDL statement.
void	removePersistence(CachedObject row)
void	saveRow(CachedObject row) The row is always in uncommittedCache.
void	setHeader(java.lang.String header)
void	setHeaderInitialise(java.lang.String header)

Methods inherited from class org.hsqldb.persist.DataFileCache

adjustStoreCount, bytesCapacity, capacity, enlargeFileSpace, get, getAccessCount, getCachedObjectCount, getDataFileScale, getFileFreePos, getFileName, getFlags, getLostBlockSize, getShadowFile, getStorageSize, getTotalCachedBlockSize, hasRowInfo, isDataReadOnly, isFileModified, isFileOpen, isModified, release, releaseRange, reopen, replace, reset, saveRowOutput

Methods inherited from class java.lang.Object

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

Method Detail

open

public void open(boolean readonly)

Opens a data source file.

Overrides:

open in class DataFileCache

release

public void release()

Description copied from class: DataFileCache

Abandons changed rows and closes the .data file.

Overrides:

release in class DataFileCache

close

public void close()

Writes newly created rows to disk. In the current implentation, such rows have already been saved, so this method just removes a source file that has no rows.

Overrides:

close in class DataFileCache

remove

public void remove(CachedObject object)

Description copied from class: DataFileCache

Used when a row is deleted as a result of some DML or DDL statement. Removes the row from the cache data structures. Adds the file space for the row to the list of free positions.

Overrides:

remove in class DataFileCache

removePersistence

public void removePersistence(CachedObject row)

Overrides:

removePersistence in class DataFileCache

addInit

public void addInit(CachedObject object)

add

public void add(CachedObject object)

Overrides:

add in class DataFileCache

get

public CachedObject get(CachedObject object,
                        PersistentStore store,
                        boolean keep)

cannot use isInMemory() for text cached object

Overrides:

get in class DataFileCache

get

public CachedObject get(long i,
                        PersistentStore store,
                        boolean keep)

Overrides:

get in class DataFileCache

saveRow

public void saveRow(CachedObject row)

The row is always in uncommittedCache. Saves the row as normal and removes it

Overrides:

saveRow in class DataFileCache

getHeader

public java.lang.String getHeader()

setHeaderInitialise

public void setHeaderInitialise(java.lang.String header)

setHeader

public void setHeader(java.lang.String header)

getLineNumber

public int getLineNumber()

getTextFileSettings

public TextFileSettings getTextFileSettings()

isIgnoreFirstLine

public boolean isIgnoreFirstLine()

getTextFileReader

public TextFileReader getTextFileReader()