http://www.eclipse.org/jgit//org.eclipse.jgit: Repository access and algorithms (Eclipse JGit Project)
  • Eclipse Distribution License (New BSD License)
  • Andrey Loskutov
  • Christian Halstrick
  • Dave Borowitz
  • David Pursehouse
  • Gunnar Wagenknecht
  • Jonathan Nieder
  • Jonathan Tan
  • Matthias Sohn
  • Sasa Zivkov
  • Terry Parker
  • Thomas Wolf 
/*
 * Copyright (C) 2008-2009, Google Inc.
 * Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
 * 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 static java.nio.charset.StandardCharsets.UTF_8;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.UnsupportedCharsetException;

import org.eclipse.jgit.errors.CorruptObjectException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.util.MutableInteger;
import org.eclipse.jgit.util.RawParseUtils;
import org.eclipse.jgit.util.StringUtils;


An annotated tag.

/**
 * An annotated tag.
 */
public class RevTag extends RevObject {
	
Parse an annotated tag from its canonical format. This method constructs a temporary revision pool, parses the tag as supplied, and returns it to the caller. Since the tag was built inside of a private revision pool its object pointer will be initialized, but will not have its headers loaded. Applications are discouraged from using this API. Callers usually need more than one object. Use RevWalk.parseTag(AnyObjectId) to obtain a RevTag from an existing repository. 
Params:
  • raw – 
           the canonical formatted tag to be parsed.
Throws:
Returns:the parsed tag, in an isolated revision pool that is not
        available to the caller.
/**
	 * Parse an annotated tag from its canonical format.
	 *
	 * This method constructs a temporary revision pool, parses the tag as
	 * supplied, and returns it to the caller. Since the tag was built inside of
	 * a private revision pool its object pointer will be initialized, but will
	 * not have its headers loaded.
	 *
	 * Applications are discouraged from using this API. Callers usually need
	 * more than one object. Use
	 * {@link org.eclipse.jgit.revwalk.RevWalk#parseTag(AnyObjectId)} to obtain
	 * a RevTag from an existing repository.
	 *
	 * @param raw
	 *            the canonical formatted tag to be parsed.
	 * @return the parsed tag, in an isolated revision pool that is not
	 *         available to the caller.
	 * @throws org.eclipse.jgit.errors.CorruptObjectException
	 *             the tag contains a malformed header that cannot be handled.
	 */
	public static RevTag parse(byte[] raw) throws CorruptObjectException {
		return parse(new RevWalk((ObjectReader) null), raw);
	}

	
Parse an annotated tag from its canonical format.


This method inserts the tag directly into the caller supplied revision
pool, making it appear as though the tag exists in the repository, even
if it doesn't. The repository under the pool is not affected.

 The body of the tag (message, tagger, signature) is always retained in the returned RevTag, even if the supplied RevWalk has been configured with setRetainBody(false). 
Params:
  • rw – 
           the revision pool to allocate the tag within. The tag's object
           pointer will be obtained from this pool.
  • raw –  the canonical formatted tag to be parsed. This buffer will be retained by the returned RevTag and must not be modified by the caller.
Throws:
Returns:the parsed tag, in an isolated revision pool that is not
        available to the caller.
/**
	 * Parse an annotated tag from its canonical format.
	 * <p>
	 * This method inserts the tag directly into the caller supplied revision
	 * pool, making it appear as though the tag exists in the repository, even
	 * if it doesn't. The repository under the pool is not affected.
	 * <p>
	 * The body of the tag (message, tagger, signature) is always retained in
	 * the returned {@code RevTag}, even if the supplied {@code RevWalk} has
	 * been configured with {@code setRetainBody(false)}.
	 *
	 * @param rw
	 *            the revision pool to allocate the tag within. The tag's object
	 *            pointer will be obtained from this pool.
	 * @param raw
	 *            the canonical formatted tag to be parsed. This buffer will be
	 *            retained by the returned {@code RevTag} and must not be
	 *            modified by the caller.
	 * @return the parsed tag, in an isolated revision pool that is not
	 *         available to the caller.
	 * @throws org.eclipse.jgit.errors.CorruptObjectException
	 *             the tag contains a malformed header that cannot be handled.
	 */
	public static RevTag parse(RevWalk rw, byte[] raw)
			throws CorruptObjectException {
		try (ObjectInserter.Formatter fmt = new ObjectInserter.Formatter()) {
			RevTag r = rw.lookupTag(fmt.idFor(Constants.OBJ_TAG, raw));
			r.parseCanonical(rw, raw);
			r.buffer = raw;
			return r;
		}
	}

	private RevObject object;

	private byte[] buffer;

	private String tagName;

	
Create a new tag reference.

Params:
  • id – 
           object name for the tag.
/**
	 * Create a new tag reference.
	 *
	 * @param id
	 *            object name for the tag.
	 */
	protected RevTag(AnyObjectId id) {
		super(id);
	}

	@Override
	void parseHeaders(RevWalk walk) throws MissingObjectException,
			IncorrectObjectTypeException, IOException {
		parseCanonical(walk, walk.getCachedBytes(this));
	}

	@Override
	void parseBody(RevWalk walk) throws MissingObjectException,
			IncorrectObjectTypeException, IOException {
		if (buffer == null) {
			buffer = walk.getCachedBytes(this);
			if ((flags & PARSED) == 0)
				parseCanonical(walk, buffer);
		}
	}

	void parseCanonical(RevWalk walk, byte[] rawTag)
			throws CorruptObjectException {
		final MutableInteger pos = new MutableInteger();
		final int oType;

		pos.value = 53; // "object $sha1\ntype "
		oType = Constants.decodeTypeString(this, rawTag, (byte) '\n', pos);
		walk.idBuffer.fromString(rawTag, 7);
		object = walk.lookupAny(walk.idBuffer, oType);

		int p = pos.value += 4; // "tag "
		final int nameEnd = RawParseUtils.nextLF(rawTag, p) - 1;
		tagName = RawParseUtils.decode(UTF_8, rawTag, p, nameEnd);

		if (walk.isRetainBody())
			buffer = rawTag;
		flags |= PARSED;
	}

	
{@inheritDoc} 
/** {@inheritDoc} */
	@Override
	public final int getType() {
		return Constants.OBJ_TAG;
	}

	
Parse the tagger identity from the raw buffer.


This method parses and returns the content of the tagger line, after
taking the tag's character set into account and decoding the tagger
name and email address. This method is fairly expensive and produces a
new PersonIdent instance on each invocation. Callers should invoke this
method only if they are certain they will be outputting the result, and
should cache the return value for as long as necessary to use all
information from it.

Returns:identity of the tagger (name, email) and the time the tag
        was made by the tagger; null if no tagger line was found.
/**
	 * Parse the tagger identity from the raw buffer.
	 * <p>
	 * This method parses and returns the content of the tagger line, after
	 * taking the tag's character set into account and decoding the tagger
	 * name and email address. This method is fairly expensive and produces a
	 * new PersonIdent instance on each invocation. Callers should invoke this
	 * method only if they are certain they will be outputting the result, and
	 * should cache the return value for as long as necessary to use all
	 * information from it.
	 *
	 * @return identity of the tagger (name, email) and the time the tag
	 *         was made by the tagger; null if no tagger line was found.
	 */
	public final PersonIdent getTaggerIdent() {
		final byte[] raw = buffer;
		final int nameB = RawParseUtils.tagger(raw, 0);
		if (nameB < 0)
			return null;
		return RawParseUtils.parsePersonIdent(raw, nameB);
	}

	
Parse the complete tag message and decode it to a string.


This method parses and returns the message portion of the tag buffer,
after taking the tag's character set into account and decoding the buffer
using that character set. This method is a fairly expensive operation and
produces a new string on each invocation.

Returns:decoded tag message as a string. Never null.
/**
	 * Parse the complete tag message and decode it to a string.
	 * <p>
	 * This method parses and returns the message portion of the tag buffer,
	 * after taking the tag's character set into account and decoding the buffer
	 * using that character set. This method is a fairly expensive operation and
	 * produces a new string on each invocation.
	 *
	 * @return decoded tag message as a string. Never null.
	 */
	public final String getFullMessage() {
		byte[] raw = buffer;
		int msgB = RawParseUtils.tagMessage(raw, 0);
		if (msgB < 0) {
			return ""; //$NON-NLS-1$
		}
		return RawParseUtils.decode(guessEncoding(), raw, msgB, raw.length);
	}

	
Parse the tag message and return the first "line" of it.


The first line is everything up to the first pair of LFs. This is the
"oneline" format, suitable for output in a single line display.


This method parses and returns the message portion of the tag buffer,
after taking the tag's character set into account and decoding the buffer
using that character set. This method is a fairly expensive operation and
produces a new string on each invocation.

Returns:decoded tag message as a string. Never null. The returned string
        does not contain any LFs, even if the first paragraph spanned
        multiple lines. Embedded LFs are converted to spaces.
/**
	 * Parse the tag message and return the first "line" of it.
	 * <p>
	 * The first line is everything up to the first pair of LFs. This is the
	 * "oneline" format, suitable for output in a single line display.
	 * <p>
	 * This method parses and returns the message portion of the tag buffer,
	 * after taking the tag's character set into account and decoding the buffer
	 * using that character set. This method is a fairly expensive operation and
	 * produces a new string on each invocation.
	 *
	 * @return decoded tag message as a string. Never null. The returned string
	 *         does not contain any LFs, even if the first paragraph spanned
	 *         multiple lines. Embedded LFs are converted to spaces.
	 */
	public final String getShortMessage() {
		byte[] raw = buffer;
		int msgB = RawParseUtils.tagMessage(raw, 0);
		if (msgB < 0) {
			return ""; //$NON-NLS-1$
		}

		int msgE = RawParseUtils.endOfParagraph(raw, msgB);
		String str = RawParseUtils.decode(guessEncoding(), raw, msgB, msgE);
		if (RevCommit.hasLF(raw, msgB, msgE)) {
			str = StringUtils.replaceLineBreaksWithSpace(str);
		}
		return str;
	}

	private Charset guessEncoding() {
		try {
			return RawParseUtils.parseEncoding(buffer);
		} catch (IllegalCharsetNameException | UnsupportedCharsetException e) {
			return UTF_8;
		}
	}

	
Get a reference to the object this tag was placed on.

 Note that the returned object has only been looked up (see RevWalk.lookupAny(AnyObjectId, int). To access the contents it needs to be parsed, see RevWalk.parseHeaders(RevObject) and RevWalk.parseBody(RevObject). 
 As an alternative, use RevWalk.peel(RevObject) and pass this RevTag to peel it until the first non-tag object. 
Returns:object this tag refers to (only looked up, not parsed)
/**
	 * Get a reference to the object this tag was placed on.
	 * <p>
	 * Note that the returned object has only been looked up (see
	 * {@link org.eclipse.jgit.revwalk.RevWalk#lookupAny(AnyObjectId, int)}. To
	 * access the contents it needs to be parsed, see
	 * {@link org.eclipse.jgit.revwalk.RevWalk#parseHeaders(RevObject)} and
	 * {@link org.eclipse.jgit.revwalk.RevWalk#parseBody(RevObject)}.
	 * <p>
	 * As an alternative, use
	 * {@link org.eclipse.jgit.revwalk.RevWalk#peel(RevObject)} and pass this
	 * {@link org.eclipse.jgit.revwalk.RevTag} to peel it until the first
	 * non-tag object.
	 *
	 * @return object this tag refers to (only looked up, not parsed)
	 */
	public final RevObject getObject() {
		return object;
	}

	
Get the name of this tag, from the tag header.

Returns:name of the tag, according to the tag header.
/**
	 * Get the name of this tag, from the tag header.
	 *
	 * @return name of the tag, according to the tag header.
	 */
	public final String getTagName() {
		return tagName;
	}

	
Discard the message buffer to reduce memory usage.

 After discarding the memory usage of the RevTag is reduced to only the getObject() pointer and getTagName(). Accessing other properties such as getTaggerIdent() or either message function requires reloading the buffer by invoking RevWalk.parseBody(RevObject). 
Since:4.0
/**
	 * Discard the message buffer to reduce memory usage.
	 * <p>
	 * After discarding the memory usage of the {@code RevTag} is reduced to
	 * only the {@link #getObject()} pointer and {@link #getTagName()}.
	 * Accessing other properties such as {@link #getTaggerIdent()} or either
	 * message function requires reloading the buffer by invoking
	 * {@link org.eclipse.jgit.revwalk.RevWalk#parseBody(RevObject)}.
	 *
	 * @since 4.0
	 */
	public final void disposeBody() {
		buffer = null;
	}
}