Class PackReverseIndex
java.lang.Object
org.eclipse.jgit.internal.storage.file.PackReverseIndex
Reverse index for forward pack index. Provides operations based on offset instead of object id. Such offset-based reverse lookups are performed in O(log n) time.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final long
The number of bytes per entry in the offsetIndex.private final PackIndex
Index we were created from, and that has our ObjectId data.private final int[]
Mapping from indices in offset order to indices in SHA-1 order.private final int[]
An index into the nth mapping, where the value is the position after the the last index that contains the values of the bucket. -
Constructor Summary
ConstructorsConstructorDescriptionPackReverseIndex
(PackIndex packIndex) Create reverse index from straight/forward pack index, by indexing all its entries. -
Method Summary
Modifier and TypeMethodDescriptionprivate int
binarySearch
(long offset) long
findNextOffset
(long offset, long maxOffset) Search for the next offset to the specified offset in this pack (reverse) index.findObject
(long offset) Search for object id with the specified start offset in this pack (reverse) index.(package private) ObjectId
findObjectByPosition
(int nthPosition) (package private) int
findPostion
(long offset)
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Field Details
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index
Index we were created from, and that has our ObjectId data. -
bucketSize
private final long bucketSizeThe number of bytes per entry in the offsetIndex. -
offsetIndex
private final int[] offsetIndexAn index into the nth mapping, where the value is the position after the the last index that contains the values of the bucket. For example given offset o (and bucket = o / bucketSize), the offset will be contained in the range nth[offsetIndex[bucket - 1]] inclusive to nth[offsetIndex[bucket]] exclusive. SeebinarySearch(long)
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nth
private final int[] nthMapping from indices in offset order to indices in SHA-1 order.
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Constructor Details
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PackReverseIndex
Create reverse index from straight/forward pack index, by indexing all its entries.- Parameters:
packIndex
- forward index - entries to (reverse) index.
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Method Details
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findObject
Search for object id with the specified start offset in this pack (reverse) index.- Parameters:
offset
- start offset of object to find.- Returns:
- object id for this offset, or null if no object was found.
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findNextOffset
Search for the next offset to the specified offset in this pack (reverse) index.- Parameters:
offset
- start offset of previous object (must be valid-existing offset).maxOffset
- maximum offset in a pack (returned when there is no next offset).- Returns:
- offset of the next object in a pack or maxOffset if provided offset was the last one.
- Throws:
CorruptObjectException
- when there is no object with the provided offset.
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findPostion
int findPostion(long offset) -
binarySearch
private int binarySearch(long offset) -
findObjectByPosition
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