/*
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
 * 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.revwalk;

import java.text.MessageFormat;

import org.eclipse.jgit.internal.JGitText;

Application level mark bit for RevObjects. 
 To create a flag use RevWalk.newFlag(String). /**
 * Application level mark bit for {@link org.eclipse.jgit.revwalk.RevObject}s.
 * <p>
 * To create a flag use
 * {@link org.eclipse.jgit.revwalk.RevWalk#newFlag(String)}.
 */
public class RevFlag {
	
Uninteresting by RevWalk.markUninteresting(RevCommit). 
 We flag commits as uninteresting if the caller does not want commits reachable from a commit to RevWalk.markUninteresting(RevCommit). This flag is always carried into the commit's parents and is a key part of the "rev-list B --not A" feature; A is marked UNINTERESTING. 

This is a static flag. Its RevWalk is not available.
/**
	 * Uninteresting by {@link RevWalk#markUninteresting(RevCommit)}.
	 * <p>
	 * We flag commits as uninteresting if the caller does not want commits
	 * reachable from a commit to {@link RevWalk#markUninteresting(RevCommit)}.
	 * This flag is always carried into the commit's parents and is a key part
	 * of the "rev-list B --not A" feature; A is marked UNINTERESTING.
	 * <p>
	 * This is a static flag. Its RevWalk is not available.
	 */
	public static final RevFlag UNINTERESTING = new StaticRevFlag(
			"UNINTERESTING", RevWalk.UNINTERESTING); //$NON-NLS-1$

	
Set on RevCommit instances added to RevWalk.pending queue. 

We use this flag to avoid adding the same commit instance twice to our
queue, especially if we reached it by more than one path.

This is a static flag. Its RevWalk is not available.
Since:
3.0/**
	 * Set on RevCommit instances added to {@link RevWalk#pending} queue.
	 * <p>
	 * We use this flag to avoid adding the same commit instance twice to our
	 * queue, especially if we reached it by more than one path.
	 * <p>
	 * This is a static flag. Its RevWalk is not available.
	 *
	 * @since 3.0
	 */
	public static final RevFlag SEEN = new StaticRevFlag("SEEN", RevWalk.SEEN); //$NON-NLS-1$

	final RevWalk walker;

	final String name;

	final int mask;

	RevFlag(RevWalk w, String n, int m) {
		walker = w;
		name = n;
		mask = m;
	}

	
Get the revision walk instance this flag was created from.
Returns:
the walker this flag was allocated out of, and belongs to./**
	 * Get the revision walk instance this flag was created from.
	 *
	 * @return the walker this flag was allocated out of, and belongs to.
	 */
	public RevWalk getRevWalk() {
		return walker;
	}

	
{@inheritDoc} /** {@inheritDoc} */
	@Override
	public String toString() {
		return name;
	}

	static class StaticRevFlag extends RevFlag {
		StaticRevFlag(String n, int m) {
			super(null, n, m);
		}

		@Override
		public RevWalk getRevWalk() {
			throw new UnsupportedOperationException(MessageFormat.format(
					JGitText.get().isAStaticFlagAndHasNorevWalkInstance, toString()));
		}
	}
}