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/*
* Copyright (C) 2012, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.file;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectIdOwnerMap;
import com.googlecode.javaewah.EWAHCompressedBitmap;
/**
* Base implementation of the PackBitmapIndex.
*/
abstract class BasePackBitmapIndex implements PackBitmapIndex {
private final ObjectIdOwnerMap<StoredBitmap> bitmaps;
BasePackBitmapIndex(ObjectIdOwnerMap<StoredBitmap> bitmaps) {
this.bitmaps = bitmaps;
}
@Override
public EWAHCompressedBitmap getBitmap(AnyObjectId objectId) {
StoredBitmap sb = bitmaps.get(objectId);
return sb != null ? sb.getBitmap() : null;
}
ObjectIdOwnerMap<StoredBitmap> getBitmaps() {
return bitmaps;
}
@Override
public int getBaseBitmapCount() {
int bases = 0;
for (StoredBitmap sb : getBitmaps()) {
if (sb.isBase()) {
bases += 1;
}
}
return bases;
}
@Override
public long getBaseBitmapSizeInBytes() {
long baseSize = 0;
for (StoredBitmap sb : getBitmaps()) {
if (sb.isBase()) {
baseSize += sb.getCurrentSizeInBytes();
}
}
return baseSize;
}
@Override
public int getXorBitmapCount() {
int xored = 0;
for (StoredBitmap sb : getBitmaps()) {
if (!sb.isBase()) {
xored += 1;
}
}
return xored;
}
@Override
public long getXorBitmapSizeInBytes() {
long xorSize = 0;
for (StoredBitmap sb : getBitmaps()) {
if (!sb.isBase()) {
xorSize += sb.getCurrentSizeInBytes();
}
}
return xorSize;
}
/**
* Data representation of the bitmap entry restored from a pack index. The
* commit of the bitmap is the map key.
*/
static final class StoredBitmap extends ObjectIdOwnerMap.Entry {
private volatile Object bitmapContainer;
private final int flags;
StoredBitmap(AnyObjectId objectId, EWAHCompressedBitmap bitmap,
StoredBitmap xorBitmap, int flags) {
super(objectId);
this.bitmapContainer = xorBitmap == null
? bitmap
: new XorCompressedBitmap(bitmap, xorBitmap);
this.flags = flags;
}
/**
* Computes and returns the full bitmap.
*
* @return the full bitmap
*/
EWAHCompressedBitmap getBitmap() {
EWAHCompressedBitmap bitmap = getBitmapWithoutCaching();
// Cache the result.
bitmapContainer = bitmap;
return bitmap;
}
/**
* Compute and return the full bitmap, do NOT cache the expanded bitmap,
* which saves memory and should only be used during bitmap creation in
* garbage collection.
*
* @return the full bitmap
*/
EWAHCompressedBitmap getBitmapWithoutCaching() {
// Fast path to immediately return the expanded result.
Object r = bitmapContainer;
if (r instanceof EWAHCompressedBitmap) {
return (EWAHCompressedBitmap) r;
}
// Expand the bitmap but not cache the result.
XorCompressedBitmap xb = (XorCompressedBitmap) r;
EWAHCompressedBitmap out = xb.bitmap;
for (;;) {
r = xb.xorBitmap.bitmapContainer;
if (r instanceof EWAHCompressedBitmap) {
out = out.xor((EWAHCompressedBitmap) r);
out.trim();
return out;
}
xb = (XorCompressedBitmap) r;
out = out.xor(xb.bitmap);
}
}
/**
* Get flags
*
* @return the flags associated with the bitmap
*/
int getFlags() {
return flags;
}
/**
* This bitmap is (currently) a base or a XOR mask
*
* @return true if this bitmap is a base (a ready map).
*/
boolean isBase() {
return bitmapContainer instanceof EWAHCompressedBitmap;
}
/**
* Size in bytes of this bitmap in its current representation
*
* If this is a XOR'ed bitmap, size is different before/after
* {@link #getBitmap()}. Before is the byte size of the xor mask,
* afterwards is the size of the "ready" bitmap
*
* @return size in bytes of the bitmap in its current representation
*/
long getCurrentSizeInBytes() {
Object r = bitmapContainer;
if (r instanceof EWAHCompressedBitmap) {
return ((EWAHCompressedBitmap) r).sizeInBytes();
}
XorCompressedBitmap xor = ((XorCompressedBitmap) r);
return xor.bitmap.sizeInBytes();
}
}
private static final class XorCompressedBitmap {
final EWAHCompressedBitmap bitmap;
final StoredBitmap xorBitmap;
XorCompressedBitmap(EWAHCompressedBitmap b, StoredBitmap xb) {
bitmap = b;
xorBitmap = xb;
}
}
}
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