com.monitorjbl.xlsx.sst

Class FileBackedList<T>

java.lang.Object

com.monitorjbl.xlsx.sst.FileBackedList<T>

All Implemented Interfaces:

AutoCloseable

public class FileBackedList<T>
extends Object
implements AutoCloseable

File-backed list-like class. Allows addition of arbitrary numbers of array entries (serialized to JSON) in a binary packed file. Reading of entries is done with an NIO channel that seeks to the entry in the file.

File entry format:

• 4 bytes: length of entry
• length bytes: JSON string containing the entry data

Pointers to the offset of each entry are kept in a List<Long>. The values loaded from the the file are cached up to a maximum of cacheSize. Items are evicted from the cache with an LRU algorithm.

Constructor Summary

Constructors

Constructor and Description
FileBackedList(Class<T> type, File file, int cacheSize)

Method Summary

Modifier and Type	Method and Description
void	add(T obj)
void	close()
T	getAt(int index)

Methods inherited from class java.lang.Object

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

Constructor Detail

FileBackedList

public FileBackedList(Class<T> type,
                      File file,
                      int cacheSize)
               throws IOException

Throws:

IOException

Method Detail

add

public void add(T obj)

getAt

public T getAt(int index)

close

public void close()

Specified by:

close in interface AutoCloseable