Package net.ontopia.infoset.content

Class FileContentStore

java.lang.Object

net.ontopia.infoset.content.FileContentStore

All Implemented Interfaces:

ContentStoreIF

public class FileContentStore
extends Object
implements ContentStoreIF

INTERNAL: A content store implementation based on the file system. It uses a two-level structure where inside the root directory is a set of directories, each of which contains a fixed number of files (N). A key is mapped to a file name (key modulo N) and a directory name (key divided by N). The next free key is stored in a file in the top directory, and keys are allocated in blocks.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	FILES_PER_DIRECTORY
static final int	KEY_BLOCK_SIZE
static final int	MAX_SPINS
static final int	SPIN_TIMEOUT

Constructor Summary

Constructors

Constructor	Description
FileContentStore(File store_root)

Method Summary

Modifier and Type	Method	Description
int	add(InputStream data, int length)	INTERNAL: Creates an entry for the specified data value.
int	add(ContentInputStream data)	INTERNAL: Creates an entry for the specified data value.
void	close()	INTERNAL: Closes the content store.
boolean	containsKey(int key)	INTERNAL: Returns true if the content store contains an entry with the specified key.
ContentInputStream	get(int key)	INTERNAL: Gets the data value associated with the specified key.
boolean	remove(int key)	INTERNAL: Removes the entry associated with the key.

Methods inherited from class java.lang.Object

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

Field Details

FILES_PER_DIRECTORY

public static final int FILES_PER_DIRECTORY

See Also:

• Constant Field Values

KEY_BLOCK_SIZE

public static final int KEY_BLOCK_SIZE

See Also:

• Constant Field Values

MAX_SPINS

public static final int MAX_SPINS

See Also:

• Constant Field Values

SPIN_TIMEOUT

public static final int SPIN_TIMEOUT

See Also:

• Constant Field Values

Constructor Details

FileContentStore

public FileContentStore(File store_root)
                 throws ContentStoreException

Throws:

ContentStoreException

Method Details

containsKey

public boolean containsKey(int key)
                    throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Returns true if the content store contains an entry with the specified key.

Specified by:

containsKey in interface ContentStoreIF

Throws:

ContentStoreException

get

public ContentInputStream get(int key)
                       throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Gets the data value associated with the specified key.

Specified by:

get in interface ContentStoreIF

Throws:

ContentStoreException

add

public int add(ContentInputStream data)
        throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Creates an entry for the specified data value.

Specified by:

add in interface ContentStoreIF

Throws:

ContentStoreException

add

public int add(InputStream data,
 int length)
        throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Creates an entry for the specified data value.

Specified by:

add in interface ContentStoreIF

Throws:

ContentStoreException

remove

public boolean remove(int key)
               throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Removes the entry associated with the key. If the key is not present the call has no effect.

Specified by:

remove in interface ContentStoreIF

Returns:

true if the key was present; false otherwise

Throws:

ContentStoreException

close

public void close()
           throws ContentStoreException

Description copied from interface: ContentStoreIF

INTERNAL: Closes the content store. This allows all internal resources to be released.

Specified by:

close in interface ContentStoreIF

Throws:

ContentStoreException