org.eclipse.jgit.internal.storage.dfs

Class DfsCachedPack

java.lang.Object

org.eclipse.jgit.internal.storage.pack.CachedPack

org.eclipse.jgit.internal.storage.dfs.DfsCachedPack

public class DfsCachedPack
extends CachedPack

A DfsPackFile available for reuse as-is.

Method Summary

Modifier and Type	Method and Description
long	getDeltaCount() Get the number of delta objects stored in this pack.
long	getObjectCount() Get the number of objects in this pack.
DfsPackDescription	getPackDescription() Get the description of the pack.
boolean	hasObject(ObjectToPack obj, StoredObjectRepresentation rep) Determine if this pack contains the object representation given.

Methods inherited from class java.lang.Object

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

Method Detail

getPackDescription

public DfsPackDescription getPackDescription()

Get the description of the pack.

Returns:

the description of the pack.

getObjectCount

public long getObjectCount()
                    throws IOException

Get the number of objects in this pack.

Specified by:

getObjectCount in class CachedPack

Returns:

the total object count for the pack.

Throws:

IOException - if the object count cannot be read.

getDeltaCount

public long getDeltaCount()
                   throws IOException

Get the number of delta objects stored in this pack.

This is an optional method, not every cached pack storage system knows the precise number of deltas stored within the pack. This number must be smaller than CachedPack.getObjectCount() as deltas are not supposed to span across pack files.

This method must be fast, if the only way to determine delta counts is to scan the pack file's contents one object at a time, implementors should return 0 and avoid the high cost of the scan.

Overrides:

getDeltaCount in class CachedPack

Returns:

the number of deltas; 0 if the number is not known or there are no deltas.

Throws:

IOException - if the delta count cannot be read.

hasObject

public boolean hasObject(ObjectToPack obj,
                         StoredObjectRepresentation rep)

Determine if this pack contains the object representation given.

PackWriter uses this method during the finding sources phase to prune away any objects from the leading thin-pack that already appear within this pack and should not be sent twice.

Implementors are strongly encouraged to rely on looking at rep only and using its internal state to decide if this object is within this pack. Implementors should ensure a representation from this cached pack is tested as part of ObjectReuseAsIs.selectObjectRepresentation(PackWriter, org.eclipse.jgit.lib.ProgressMonitor, Iterable) , ensuring this method would eventually return true if the object would be included by this cached pack.

Specified by:

hasObject in class CachedPack

Parameters:

obj - the object being packed. Can be used as an ObjectId.

rep - representation from the ObjectReuseAsIs instance that originally supplied this CachedPack.

Returns:

true if this pack contains this object.