edu.nyu.jet.util

Class Cdb

java.lang.Object

edu.nyu.jet.util.Cdb

public final class Cdb
extends Object

Constant database implementation.

Author:

Akira ODA

See Also:

http://cr.yp.to/cdb.html

Constructor Summary

Constructors

Constructor and Description
Cdb(File file) Constructs constant database reader.
Cdb(String filename) Consructs constant database reader.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() close all resource which is held by this object.
byte[]	find(byte[] key) Returns value to be associated with the specified key.
byte[]	find(byte[] key, int offset, int len) Returns value to be associated with the specified key.
byte[]	findNext(byte[] key) Returns next entry to be associated with the specified key.
byte[]	findNext(byte[] key, int offset, int len) Returns next entry to be associated with the specified key.
void	findstart() Notifies starting of database lookup.

Methods inherited from class java.lang.Object

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

Constructor Detail

Cdb

public Cdb(File file)
    throws IOException

Constructs constant database reader.

Parameters:

file - the file object

Throws:

IOException - if an I/O error occurs

Cdb

public Cdb(String filename)
    throws IOException

Consructs constant database reader.

Parameters:

filename - filename of databse file

Throws:

IOException - if an I/O error occurs.

Method Detail

close

public void close()

close all resource which is held by this object.

findstart

public void findstart()

Notifies starting of database lookup.

findNext

public byte[] findNext(byte[] key,
              int offset,
              int len)

Returns next entry to be associated with the specified key.

Parameters:

key - key which the specified value to be associated

offset - offset of key

len - length of length

Returns:

next entry to be associated with the specified key or null if next entry is missing.

findNext

public byte[] findNext(byte[] key)

Returns next entry to be associated with the specified key.

Parameters:

key - key which the specified value to be associated

Returns:

next entry to be associated with the specified key or null if next entry is missing.

find

public byte[] find(byte[] key,
          int offset,
          int len)

Returns value to be associated with the specified key.

Parameters:

key - key which the specified value to be associated

offset - offset of key

len - length of key

Returns:

value to be associated with the speicified key or null if database does not contain the specified key.

find

public byte[] find(byte[] key)

Returns value to be associated with the specified key.

Parameters:

key - key which the specified value to be associated

Returns:

value to be associated with the speicified key or null if database does not contain the specified key.