org.eclipse.jgit.internal.storage.file

Class PackBitmapIndexRemapper

java.lang.Object

org.eclipse.jgit.internal.storage.file.PackBitmapIndex

org.eclipse.jgit.internal.storage.file.PackBitmapIndexRemapper

All Implemented Interfaces:

Iterable<PackBitmapIndexRemapper.Entry>

public class PackBitmapIndexRemapper
extends PackBitmapIndex
implements Iterable<PackBitmapIndexRemapper.Entry>

A PackBitmapIndex that remaps the bitmaps in the previous index to the positions in the new pack index. Note, unlike typical PackBitmapIndex implementations this implementation is not thread safe, as it is intended to be used with a PackBitmapIndexBuilder, which is also not thread safe.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	PackBitmapIndexRemapper.Entry An entry in the old PackBitmapIndex.

Field Summary

Fields inherited from class org.eclipse.jgit.internal.storage.file.PackBitmapIndex

FLAG_REUSE

Method Summary

Modifier and Type	Method and Description
int	findPosition(AnyObjectId objectId) Finds the position in the bitmap of the object.
com.googlecode.javaewah.EWAHCompressedBitmap	getBitmap(AnyObjectId objectId) Returns the previously constructed bitmap for the object.
int	getBitmapCount() Returns the number of bitmaps in this bitmap index.
ObjectId	getObject(int position) Get the object at the bitmap position.
int	getObjectCount() Obtain the total number of objects described by this index.
Iterator<PackBitmapIndexRemapper.Entry>	iterator()
static PackBitmapIndexRemapper	newPackBitmapIndex(BitmapIndex prevBitmapIndex, PackBitmapIndex newIndex) A PackBitmapIndex that maps the positions in the prevBitmapIndex to the ones in the newIndex.
com.googlecode.javaewah.EWAHCompressedBitmap	ofObjectType(com.googlecode.javaewah.EWAHCompressedBitmap bitmap, int type) Returns a bitmap containing positions for objects that have the given Git type.

Methods inherited from class org.eclipse.jgit.internal.storage.file.PackBitmapIndex

open, read

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

newPackBitmapIndex

public static PackBitmapIndexRemapper newPackBitmapIndex(BitmapIndex prevBitmapIndex,
                                                         PackBitmapIndex newIndex)

A PackBitmapIndex that maps the positions in the prevBitmapIndex to the ones in the newIndex.

Parameters:

prevBitmapIndex - the bitmap index with the old mapping.

newIndex - the bitmap index with the new mapping.

Returns:

a bitmap index that attempts to do the mapping between the two.

findPosition

public int findPosition(AnyObjectId objectId)

Finds the position in the bitmap of the object.

Specified by:

findPosition in class PackBitmapIndex

Parameters:

objectId - the id for which the bitmap position will be found.

Returns:

the bitmap id or -1 if the object was not found.

getObject

public ObjectId getObject(int position)
                   throws IllegalArgumentException

Get the object at the bitmap position.

Specified by:

getObject in class PackBitmapIndex

Parameters:

position - the id for which the object will be found.

Returns:

the ObjectId.

Throws:

IllegalArgumentException - when the item is not found.

getObjectCount

public int getObjectCount()

Obtain the total number of objects described by this index. getObjectCount() - 1 is the largest bit that will be set in a bitmap.

Specified by:

getObjectCount in class PackBitmapIndex

Returns:

number of objects in this index, and likewise in the associated pack that this index was generated from.

ofObjectType

public com.googlecode.javaewah.EWAHCompressedBitmap ofObjectType(com.googlecode.javaewah.EWAHCompressedBitmap bitmap,
                                                                 int type)

Returns a bitmap containing positions for objects that have the given Git type.

Specified by:

ofObjectType in class PackBitmapIndex

Parameters:

bitmap - the object bitmap.

type - the Git type.

Returns:

the object bitmap with only objects of the Git type.

iterator

public Iterator<PackBitmapIndexRemapper.Entry> iterator()

Specified by:

iterator in interface Iterable<PackBitmapIndexRemapper.Entry>

getBitmap

public com.googlecode.javaewah.EWAHCompressedBitmap getBitmap(AnyObjectId objectId)

Returns the previously constructed bitmap for the object.

Specified by:

getBitmap in class PackBitmapIndex

Parameters:

objectId - the id for which the bitmap will be found.

Returns:

the bitmap or null if the object was not found.

getBitmapCount

public int getBitmapCount()

Returns the number of bitmaps in this bitmap index.

Specified by:

getBitmapCount in class PackBitmapIndex

Returns:

the number of bitmaps in this bitmap index.