Package com.mckoi.database

Class IndexStore.MappedListBlock

java.lang.Object

com.mckoi.util.IntegerListBlockInterface

com.mckoi.util.BlockIntegerList.IntArrayListBlock

com.mckoi.database.IndexStore.MappedListBlock

Enclosing class:

IndexStore

private final class IndexStore.MappedListBlock
extends BlockIntegerList.IntArrayListBlock

An IntegerListBlockInterface implementation that maps a block of a list to an underlying file system representation.

Field Summary

Fields

Modifier and Type	Field	Description
private int	first_entry	The first entry in the block.
private int	index_sector	The sector in the index file that this block can be found.
private int	last_entry	The last entry in the block.
private java.lang.Object	lock	Lock object.
private boolean	mutable_block	Set to true if the loaded block is mutable.

Fields inherited from class com.mckoi.util.BlockIntegerList.IntArrayListBlock

array, count

Fields inherited from class com.mckoi.util.IntegerListBlockInterface

next, previous

Constructor Summary

Constructors

Constructor	Description
MappedListBlock(int block_size_in)	Creates an empty block.
MappedListBlock(int first_int, int last_int, int mapped_sector, int size)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	bottomInt()	Overwritten from IntArrayListBlock, returns the first entry of the block.
int[]	getArray(boolean immutable)	Overwritten from IntArrayListBlock, this returns the int[] array that contains the contents of the block.
int	getArrayLength()	Overwritten from IntArrayListBlock, returns the capacity of the block.
int	getIndexSector()	Returns the sector in the file of this block.
private void	prepareMutate(boolean immutable)	Makes the block mutable if it is immutable.
int	topInt()	Overwritten from IntArrayListBlock, returns the last entry of the block.
int	writeToStore()	Writes this block to a new sector in the index file and updates the information in this object accordingly.

Methods inherited from class com.mckoi.util.BlockIntegerList.IntArrayListBlock

addInt, binarySearch, canContain, clear, copyTo, copyTo, insertIntAt, intAt, isEmpty, isFull, iterativeSearch, iterativeSearch, moveTo, removeIntAt, searchFirst, searchFirst, searchLast, searchLast, setIntAt, size, toString

Methods inherited from class com.mckoi.util.IntegerListBlockInterface

hasChanged

Methods inherited from class java.lang.Object

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

Field Detail

first_entry

private int first_entry

The first entry in the block.

last_entry

private int last_entry

The last entry in the block.

index_sector

private int index_sector

The sector in the index file that this block can be found.

lock

private java.lang.Object lock

Lock object.

mutable_block

private boolean mutable_block

Set to true if the loaded block is mutable.

Constructor Detail

MappedListBlock

public MappedListBlock(int first_int,
                       int last_int,
                       int mapped_sector,
                       int size)

Constructor.

MappedListBlock

public MappedListBlock(int block_size_in)

Creates an empty block.

Method Detail

getIndexSector

public int getIndexSector()

Returns the sector in the file of this block.

writeToStore

public int writeToStore()
                 throws java.io.IOException

Writes this block to a new sector in the index file and updates the information in this object accordingly.

Returns the sector the block was written to.

Throws:

java.io.IOException

getArray

public int[] getArray(boolean immutable)

Overwritten from IntArrayListBlock, this returns the int[] array that contains the contents of the block. In this implementation, we determine if the array has been read from the index file. If it hasn't we read it in, otherwise we use the version in memory.

Overrides:

getArray in class BlockIntegerList.IntArrayListBlock

getArrayLength

public int getArrayLength()

Overwritten from IntArrayListBlock, returns the capacity of the block.

Overrides:

getArrayLength in class BlockIntegerList.IntArrayListBlock

prepareMutate

private void prepareMutate(boolean immutable)

Makes the block mutable if it is immutable. We must be synchronized on 'lock' before this method is called.

topInt

public int topInt()

Overwritten from IntArrayListBlock, returns the last entry of the block.

Overrides:

topInt in class BlockIntegerList.IntArrayListBlock

bottomInt

public int bottomInt()

Overwritten from IntArrayListBlock, returns the first entry of the block.

Overrides:

bottomInt in class BlockIntegerList.IntArrayListBlock