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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.lib;
import java.util.Iterator;
import org.eclipse.jgit.internal.storage.file.PackBitmapIndex;
import com.googlecode.javaewah.EWAHCompressedBitmap;
/**
* A compressed bitmap representation of the entire object graph.
*
* @since 3.0
*/
public interface BitmapIndex {
/**
* Get the bitmap for the id. The returned bitmap is immutable and the
* bitwise operations return the result of the operation in a new Bitmap.
*
* @param objectId
* the object ID
* @return the Bitmap for the objectId or null, if one does not exist.
*/
Bitmap getBitmap(AnyObjectId objectId);
/**
* Create a new {@code BitmapBuilder} based on the values in the index.
*
* @return a new {@code BitmapBuilder} based on the values in the index.
*/
BitmapBuilder newBitmapBuilder();
/**
* A bitmap representation of ObjectIds that can be iterated to return the
* underlying {@code ObjectId}s or operated on with other {@code Bitmap}s.
*/
public interface Bitmap extends Iterable<BitmapObject> {
/**
* Bitwise-OR the current bitmap with the value from the other
* bitmap.
*
* @param other
* the other bitmap
* @return a bitmap that is the bitwise-OR.
*/
Bitmap or(Bitmap other);
/**
* Bitwise-AND-NOT the current bitmap with the value from the other
* bitmap.
*
* @param other
* the other bitmap
* @return a bitmap that is the bitwise-AND-NOT.
*/
Bitmap andNot(Bitmap other);
/**
* Bitwise-XOR the current bitmap with the value from the other
* bitmap.
*
* @param other
* the other bitmap
* @return a bitmap that is the bitwise-XOR.
*/
Bitmap xor(Bitmap other);
/**
* Returns an iterator over a set of elements of type BitmapObject. The
* BitmapObject instance is reused across calls to
* {@link Iterator#next()} for performance reasons.
*
* @return an Iterator.
*/
@Override
Iterator<BitmapObject> iterator();
/**
* Returns the corresponding raw compressed EWAH bitmap of the bitmap.
*
* @return the corresponding {@code EWAHCompressedBitmap}
* @since 5.8
*/
EWAHCompressedBitmap retrieveCompressed();
}
/**
* A builder for a bitmap. The bitwise operations update the builder and
* return a reference to the current builder.
*/
public interface BitmapBuilder extends Bitmap {
/**
* Whether the bitmap has the id set.
*
* @param objectId
* the object ID
* @return whether the bitmap currently contains the object ID
*/
boolean contains(AnyObjectId objectId);
/**
* Adds the id to the bitmap.
*
* @param objectId
* the object ID
* @param type
* the Git object type. See {@link Constants}.
* @return the current builder.
* @since 4.2
*/
BitmapBuilder addObject(AnyObjectId objectId, int type);
/**
* Remove the id from the bitmap.
*
* @param objectId
* the object ID
*/
void remove(AnyObjectId objectId);
/**
* Bitwise-OR the current bitmap with the value from the other bitmap.
*
* @param other
* the other bitmap
* @return the current builder.
*/
@Override
BitmapBuilder or(Bitmap other);
/**
* Bitwise-AND-NOT the current bitmap with the value from the other
* bitmap.
*
* @param other
* the other bitmap
* @return the current builder.
*/
@Override
BitmapBuilder andNot(Bitmap other);
/**
* Bitwise-XOR the current bitmap with the value from the other bitmap.
*
* @param other
* the other bitmap
* @return the current builder.
*/
@Override
BitmapBuilder xor(Bitmap other);
/**
* Build the bitmap
*
* @return the fully built immutable bitmap
*/
Bitmap build();
/**
* Determines if the entire bitmap index is contained in the bitmap. If
* it is, the matching bits are removed from the bitmap and true is
* returned. If the bitmap index is null, false is returned.
*
* @param bitmapIndex
* the bitmap index to check if it is completely contained
* inside of the current bitmap.
* @return {@code true} if the bitmap index was a complete match.
*/
boolean removeAllOrNone(PackBitmapIndex bitmapIndex);
/**
* Get number of elements in the bitmap
*
* @return the number of elements in the bitmap.
*/
int cardinality();
/**
* Get the BitmapIndex for this BitmapBuilder.
*
* @return the BitmapIndex for this BitmapBuilder
*
* @since 4.2
*/
BitmapIndex getBitmapIndex();
}
}
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