net.sf.mybatchfwk.history
Class KeysFileIndexer

java.lang.Object
  net.sf.mybatchfwk.history.KeysFileIndexer

public class KeysFileIndexer
extends java.lang.Object

The KeysFileIndexer classe is used in order to index keys contained into a file (one line = one key).
This indexer (based on the HashMap class) store into the memory only the hash key and the line number of each key (so it can be used to work with a large number of keys).

Author:

Jérôme Bertèche (cyberteche@users.sourceforge.net)

Constructor Summary

KeysFileIndexer(java.io.File keysFile, java.lang.String mode)
Constructs an empty KeysFileIndexer with the default initial capacity (16) and the default load factor (0.75).

Method Summary

void	addKey(java.lang.String key) Add a new key to the end of the file
protected void	buildIndex() Index the keys of the file
void	closeReader() Close the keys reader
boolean	containsKey(java.lang.String key) Returns true if this map contains a mapping for the specified key.
boolean	isEmpty() Returns true if this map contains no key-value mappings.
protected void	putKey(long pointer, java.lang.String key) Add a new entry from the given key
int	size() Returns the number of key-value mappings in this map.

Methods inherited from class java.lang.Object

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

Constructor Detail

KeysFileIndexer

public KeysFileIndexer(java.io.File keysFile,
                       java.lang.String mode)
                throws java.io.IOException

Constructs an empty KeysFileIndexer with the default initial capacity (16) and the default load factor (0.75).

Throws:

java.io.IOException

Method Detail

buildIndex

protected void buildIndex()
                   throws java.io.IOException

Index the keys of the file

Throws:

java.io.IOException

closeReader

public void closeReader()
                 throws java.io.IOException

Close the keys reader

Throws:

java.io.IOException

size

public int size()

Returns the number of key-value mappings in this map.

Returns:

the number of key-value mappings in this map.

isEmpty

public boolean isEmpty()

Returns true if this map contains no key-value mappings.

Returns:

true if this map contains no key-value mappings.

addKey

public void addKey(java.lang.String key)
            throws java.io.IOException

Add a new key to the end of the file

Parameters:

key -

Throws:

java.io.IOException

putKey

protected void putKey(long pointer,
                      java.lang.String key)

Add a new entry from the given key

Parameters:

pointer -

key -

containsKey

public boolean containsKey(java.lang.String key)
                    throws java.io.IOException

Returns true if this map contains a mapping for the specified key.

Parameters:

key - The key whose presence in this map is to be tested

Returns:

true if this map contains a mapping for the specified key.

Throws:

java.io.IOException