Package org.eclipse.jgit.internal.storage.dfs

Class DfsCachedPack

  • public class DfsCachedPack
extends CachedPack
    A DfsPackFile available for reuse as-is.

    • Method Detail

      • getPackFile

        public DfsPackFile getPackFile()
        Returns:
        the pack passed to the constructor

      • 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.