Package org.eclipse.mat.parser.index

Class IndexReader.IntIndexReader

java.lang.Object

org.eclipse.mat.parser.index.IndexReader.IntIndexReader

All Implemented Interfaces:

IIndexReader, IIndexReader.IOne2OneIndex

Enclosing class:

IndexReader

public static class IndexReader.IntIndexReader
extends Object
implements IIndexReader.IOne2OneIndex

An int to int index reader. Disk file structure:

 Page 0: ArrayIntCompressed
 Page 1: ArrayIntCompressed
 ...
 Page n: ArrayIntCompressed
 page 0 start in file (8)
 page 1 start in file (8)
 ...
 page n start in file (8)
 page n+1 start in file (8) (i.e. location of 'page 0 start in file' field)
 page size (4)
 total size (4)
 

Experimental for version 1.2: The disk format has been enhanced to allow more than 2^31 entries by using the page n+1 start pointer to find the start of the page offsets, and so the number of pages, and the size field is then negative and used to measure the number of entries on the last page (from 1 to page size). This is experimental and index files with 2^31 entries or more are not compatible with 1.1 or earlier and might not be compatible with 1.3 or later.

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.mat.parser.index.IIndexReader

IIndexReader.IOne2LongIndex, IIndexReader.IOne2ManyIndex, IIndexReader.IOne2ManyObjectsIndex, IIndexReader.IOne2OneIndex, IIndexReader.IOne2SizeIndex

Field Summary

Fields

Modifier and Type	Field	Description
SimpleBufferedRandomAccessInputStream	in	For use reading the actual index file
Object	LOCK	The lock to protect the read from concurrent access

Constructor Summary

Constructors

Constructor	Description
IntIndexReader(File indexFile)
IntIndexReader(File indexFile, org.eclipse.mat.parser.index.IndexWriter.Pages<SoftReference<ArrayIntCompressed>> pages, int size, int pageSize, long[] pageStart)
IntIndexReader(SimpleBufferedRandomAccessInputStream in, long start, long length)

Method Summary

Modifier and Type	Method	Description
void	close()	Close the backing file.
void	delete()	Delete the backing file.
int	get(int index)
int[]	getAll(int[] index)
int[]	getNext(int index, int length)
IteratorInt	iterator()
void	set(int index, int value)
int	size()
void	unload()	Clear the caches.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.mat.parser.index.IIndexReader

size

Methods inherited from interface org.eclipse.mat.parser.index.IIndexReader.IOne2OneIndex

get, getAll, getNext

Field Details

LOCK

public Object LOCK

The lock to protect the read from concurrent access

in

public SimpleBufferedRandomAccessInputStream in

For use reading the actual index file

Constructor Details

IntIndexReader

public IntIndexReader(File indexFile,
 org.eclipse.mat.parser.index.IndexWriter.Pages<SoftReference<ArrayIntCompressed>> pages,
 int size,
 int pageSize,
 long[] pageStart)

IntIndexReader

public IntIndexReader(File indexFile)
               throws IOException

Throws:

IOException

IntIndexReader

public IntIndexReader(SimpleBufferedRandomAccessInputStream in,
 long start,
 long length)
               throws IOException

Throws:

IOException

Method Details

unload

public void unload()

Description copied from interface: IIndexReader

Clear the caches. Used when the indexes are not current in use and the memory needs to be reclaimed such as when building the dominator tree.

Specified by:

unload in interface IIndexReader

close

public void close()

Description copied from interface: IIndexReader

Close the backing file.

Specified by:

close in interface IIndexReader

delete

public void delete()

Description copied from interface: IIndexReader

Delete the backing file.

Specified by:

delete in interface IIndexReader

get

public int get(int index)

getNext

public int[] getNext(int index,
 int length)

getAll

public int[] getAll(int[] index)

set

public void set(int index,
 int value)

size

public int size()

iterator

public IteratorInt iterator()