jgit/org.eclipse.jgit/src/org/eclipse/jgit/notes/InMemoryNoteBucket.java

/*
 * Copyright (C) 2010, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.notes;

/** A note bucket that has been loaded into the process. */
abstract class InMemoryNoteBucket extends NoteBucket {
	/**
	 * Number of leading digits that leads to this bucket in the note path.
	 *
	 * This is counted in terms of hex digits, not raw bytes. Each bucket level
	 * is typically 2 higher than its parent, placing about 256 items in each
	 * level of the tree.
	 */
	final int prefixLen;

	/**
	 * Chain of non-note tree entries found at this path in the tree.
	 *
	 * During parsing of a note tree into the in-memory representation,
	 * {@link NoteParser} keeps track of all non-note tree entries and stores
	 * them here as a sorted linked list. That list can be merged back with the
	 * note data that is held by the subclass, allowing the tree to be
	 * recreated.
	 */
	NonNoteEntry nonNotes;

	InMemoryNoteBucket(int prefixLen) {
		this.prefixLen = prefixLen;
	}

	abstract InMemoryNoteBucket append(Note note);
}