PackedObjectInfo.java

/*
 * Copyright (C) 2008-2009, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> 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.transport;

import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectIdOwnerMap;

/**
 * Description of an object stored in a pack file, including offset.
 * <p>
 * When objects are stored in packs Git needs the ObjectId and the offset
 * (starting position of the object data) to perform random-access reads of
 * objects from the pack. This extension of ObjectId includes the offset.
 */
public class PackedObjectInfo extends ObjectIdOwnerMap.Entry {
    private long offset;

    private int crc;

    private int type = Constants.OBJ_BAD;

    private long sizeBeforeInflating;

    PackedObjectInfo(final long headerOffset, final int packedCRC,
            final AnyObjectId id) {
        super(id);
        offset = headerOffset;
        crc = packedCRC;
    }

    /**
     * Create a new structure to remember information about an object.
     *
     * @param id
     *            the identity of the object the new instance tracks.
     */
    public PackedObjectInfo(AnyObjectId id) {
        super(id);
    }

    /**
     * Get offset in pack when object has been already written
     *
     * @return offset in pack when object has been already written, or 0 if it
     *         has not been written yet
     */
    public long getOffset() {
        return offset;
    }

    /**
     * Set the offset in pack when object has been written to.
     *
     * @param offset
     *            offset where written object starts
     */
    public void setOffset(long offset) {
        this.offset = offset;
    }

    /**
     * Get the 32 bit CRC checksum for the packed data.
     *
     * @return the 32 bit CRC checksum for the packed data.
     */
    public int getCRC() {
        return crc;
    }

    /**
     * Record the 32 bit CRC checksum for the packed data.
     *
     * @param crc
     *            checksum of all packed data (including object type code,
     *            inflated length and delta base reference) as computed by
     *            {@link java.util.zip.CRC32}.
     */
    public void setCRC(int crc) {
        this.crc = crc;
    }

    /**
     * Get the object type.
     *
     * @return the object type. The default type is OBJ_BAD, which is considered
     *         as unknown or invalid type.
     * @since 4.9
     */
    public int getType() {
        return type;
    }

    /**
     * Record the object type if applicable.
     *
     * @param type
     *            the object type.
     * @since 4.9
     */
    public void setType(int type) {
        this.type = type;
    }

    void setSize(long sizeBeforeInflating) {
        this.sizeBeforeInflating = sizeBeforeInflating;
    }

    long getSize() {
        return sizeBeforeInflating;
    }
}