org.deegree.io.rtree
Class MemoryPageFile

java.lang.Object
  org.deegree.io.rtree.PageFile
      org.deegree.io.rtree.MemoryPageFile

All Implemented Interfaces:

Serializable

 class MemoryPageFile
extends PageFile
implements Serializable

A memory based implementation of a PageFile.
Implemented as a Hashtable with keys representing the page file numbers of the saved nodes.

Author:

Wolfgang Baer - WBaer@gmx.de

Field Summary

Fields inherited from class org.deegree.io.rtree.PageFile

capacity, dimension, minimum

Constructor Summary

protected

MemoryPageFile() Constructor

Method Summary

protected void	close() Closes the pagefile.
protected Node	deleteNode(int pageNumber) Marks the node at given page number as deleted.
protected Node	readNode(int pageFile) Reads a node from the PageFile for given index
protected int	writeNode(Node node) Writes a node into the PageFile Method tests if node has already a PageNumber, otherwise a new page number is assigned and returned.

Methods inherited from class org.deegree.io.rtree.PageFile

getCapacity, getDimension, getMinimum, initialize

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryPageFile

protected MemoryPageFile()

Constructor

Method Detail

readNode

protected Node readNode(int pageFile)
                 throws PageFileException

Description copied from class: PageFile

Reads a node from the PageFile for given index

Specified by:

readNode in class PageFile

Parameters:

pageFile - - index of page file number where node is saved

Returns:

Node

Throws:

PageFileException

See Also:

PageFile.readNode(int)

writeNode

protected int writeNode(Node node)
                 throws PageFileException

Description copied from class: PageFile

Writes a node into the PageFile Method tests if node has already a PageNumber, otherwise a new page number is assigned and returned.

Specified by:

writeNode in class PageFile

Parameters:

node - - Node to write

Returns:

int - page number

Throws:

PageFileException

See Also:

PageFile.writeNode(Node)

deleteNode

protected Node deleteNode(int pageNumber)

Description copied from class: PageFile

Marks the node at given page number as deleted.

Specified by:

deleteNode in class PageFile

Parameters:

pageNumber - - page number

Returns:

Node - deleted node

See Also:

PageFile.deleteNode(int)

close

protected void close()
              throws PageFileException

Description copied from class: PageFile

Closes the pagefile.

Specified by:

close in class PageFile

Throws:

PageFileException

See Also:

PageFile.close()