org.eclipse.jgit/src/org/eclipse/jgit/api/LogCommand.java - jgit - Git at Google

 /*
  * Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.com> 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.api;

 import java.io.IOException;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.List;

 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.api.errors.NoHeadException;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.revwalk.filter.AndRevFilter;
 import org.eclipse.jgit.revwalk.filter.MaxCountRevFilter;
 import org.eclipse.jgit.revwalk.filter.RevFilter;
 import org.eclipse.jgit.revwalk.filter.SkipRevFilter;
 import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
 import org.eclipse.jgit.treewalk.filter.PathFilter;
 import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
 import org.eclipse.jgit.treewalk.filter.TreeFilter;

 /**
  * A class used to execute a {@code Log} command. It has setters for all
  * supported options and arguments of this command and a {@link #call()} method
  * to finally execute the command. Each instance of this class should only be
  * used for one invocation of the command (means: one call to {@link #call()})
  * <p>
  * Examples (<code>git</code> is a {@link org.eclipse.jgit.api.Git} instance):
  * <p>
  * Get newest 10 commits, starting from the current branch:
  *
  * <pre>
  * ObjectId head = repository.resolve(Constants.HEAD);
  *
  * Iterable&lt;RevCommit&gt; commits = git.log().add(head).setMaxCount(10).call();
  * </pre>
  * <p>
  *
  * Get commits only for a specific file:
  *
  * <pre>
  * git.log().add(head).addPath(&quot;dir/filename.txt&quot;).call();
  * </pre>
  *
  * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-log.html"
  *      >Git documentation about Log</a>
  */
 public class LogCommand extends GitCommand<Iterable<RevCommit>> {
 	private RevWalk walk;

 	private boolean startSpecified = false;

 	private RevFilter revFilter;

 	private final List<PathFilter> pathFilters = new ArrayList<>();
 	private final List<TreeFilter> excludeTreeFilters = new ArrayList<>();

 	private int maxCount = -1;

 	private int skip = -1;

 	/**
 	 * Constructor for LogCommand.
 	 *
 	 * @param repo
 	 *            the {@link org.eclipse.jgit.lib.Repository}
 	 */
 	protected LogCommand(Repository repo) {
 		super(repo);
 		walk = new RevWalk(repo);
 	}

 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 * Executes the {@code Log} command with all the options and parameters
 	 * collected by the setter methods (e.g. {@link #add(AnyObjectId)},
 	 * {@link #not(AnyObjectId)}, ..) of this class. Each instance of this class
 	 * should only be used for one invocation of the command. Don't call this
 	 * method twice on an instance.
 	 */
 	@Override
 	public Iterable<RevCommit> call() throws GitAPIException, NoHeadException {
 		checkCallable();
 		List<TreeFilter> filters = new ArrayList<>();
 		if (!pathFilters.isEmpty()) {
 			filters.add(AndTreeFilter.create(PathFilterGroup.create(pathFilters), TreeFilter.ANY_DIFF));
 		}
 		if (!excludeTreeFilters.isEmpty()) {
 			for (TreeFilter f : excludeTreeFilters) {
 				filters.add(AndTreeFilter.create(f, TreeFilter.ANY_DIFF));
 			}
 		}
 		if (!filters.isEmpty()) {
 			if (filters.size() == 1) {
 				filters.add(TreeFilter.ANY_DIFF);
 			}
 			walk.setTreeFilter(AndTreeFilter.create(filters));

 		}
 		if (skip > -1 && maxCount > -1)
 			walk.setRevFilter(AndRevFilter.create(SkipRevFilter.create(skip),
 					MaxCountRevFilter.create(maxCount)));
 		else if (skip > -1)
 			walk.setRevFilter(SkipRevFilter.create(skip));
 		else if (maxCount > -1)
 			walk.setRevFilter(MaxCountRevFilter.create(maxCount));
 		if (!startSpecified) {
 			try {
 				ObjectId headId = repo.resolve(Constants.HEAD);
 				if (headId == null)
 					throw new NoHeadException(
 							JGitText.get().noHEADExistsAndNoExplicitStartingRevisionWasSpecified);
 				add(headId);
 			} catch (IOException e) {
 				// all exceptions thrown by add() shouldn't occur and represent
 				// severe low-level exception which are therefore wrapped
 				throw new JGitInternalException(
 						JGitText.get().anExceptionOccurredWhileTryingToAddTheIdOfHEAD,
 						e);
 			}
 		}

 		if (this.revFilter != null) {
 			walk.setRevFilter(this.revFilter);
 		}

 		setCallable(false);
 		return walk;
 	}

 	/**
 	 * Mark a commit to start graph traversal from.
 	 *
 	 * @see RevWalk#markStart(RevCommit)
 	 * @param start
 	 *            the id of the commit to start from
 	 * @return {@code this}
 	 * @throws org.eclipse.jgit.errors.MissingObjectException
 	 *             the commit supplied is not available from the object
 	 *             database. This usually indicates the supplied commit is
 	 *             invalid, but the reference was constructed during an earlier
 	 *             invocation to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
 	 *             the object was not parsed yet and it was discovered during
 	 *             parsing that it is not actually a commit. This usually
 	 *             indicates the caller supplied a non-commit SHA-1 to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws JGitInternalException
 	 *             a low-level exception of JGit has occurred. The original
 	 *             exception can be retrieved by calling
 	 *             {@link java.lang.Exception#getCause()}. Expect only
 	 *             {@code IOException's} to be wrapped. Subclasses of
 	 *             {@link java.io.IOException} (e.g.
 	 *             {@link org.eclipse.jgit.errors.MissingObjectException}) are
 	 *             typically not wrapped here but thrown as original exception
 	 */
 	public LogCommand add(AnyObjectId start) throws MissingObjectException,
 			IncorrectObjectTypeException {
 		return add(true, start);
 	}

 	/**
 	 * Same as {@code --not start}, or {@code ^start}
 	 *
 	 * @param start
 	 *            a {@link org.eclipse.jgit.lib.AnyObjectId}
 	 * @return {@code this}
 	 * @throws org.eclipse.jgit.errors.MissingObjectException
 	 *             the commit supplied is not available from the object
 	 *             database. This usually indicates the supplied commit is
 	 *             invalid, but the reference was constructed during an earlier
 	 *             invocation to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
 	 *             the object was not parsed yet and it was discovered during
 	 *             parsing that it is not actually a commit. This usually
 	 *             indicates the caller supplied a non-commit SHA-1 to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws JGitInternalException
 	 *             a low-level exception of JGit has occurred. The original
 	 *             exception can be retrieved by calling
 	 *             {@link java.lang.Exception#getCause()}. Expect only
 	 *             {@code IOException's} to be wrapped. Subclasses of
 	 *             {@link java.io.IOException} (e.g.
 	 *             {@link org.eclipse.jgit.errors.MissingObjectException}) are
 	 *             typically not wrapped here but thrown as original exception
 	 */
 	public LogCommand not(AnyObjectId start) throws MissingObjectException,
 			IncorrectObjectTypeException {
 		return add(false, start);
 	}

 	/**
 	 * Adds the range {@code since..until}
 	 *
 	 * @param since
 	 *            a {@link org.eclipse.jgit.lib.AnyObjectId} object.
 	 * @param until
 	 *            a {@link org.eclipse.jgit.lib.AnyObjectId} object.
 	 * @return {@code this}
 	 * @throws org.eclipse.jgit.errors.MissingObjectException
 	 *             the commit supplied is not available from the object
 	 *             database. This usually indicates the supplied commit is
 	 *             invalid, but the reference was constructed during an earlier
 	 *             invocation to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
 	 *             the object was not parsed yet and it was discovered during
 	 *             parsing that it is not actually a commit. This usually
 	 *             indicates the caller supplied a non-commit SHA-1 to
 	 *             {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
 	 * @throws JGitInternalException
 	 *             a low-level exception of JGit has occurred. The original
 	 *             exception can be retrieved by calling
 	 *             {@link java.lang.Exception#getCause()}. Expect only
 	 *             {@code IOException's} to be wrapped. Subclasses of
 	 *             {@link java.io.IOException} (e.g.
 	 *             {@link org.eclipse.jgit.errors.MissingObjectException}) are
 	 *             typically not wrapped here but thrown as original exception
 	 */
 	public LogCommand addRange(AnyObjectId since, AnyObjectId until)
 			throws MissingObjectException, IncorrectObjectTypeException {
 		return not(since).add(until);
 	}

 	/**
 	 * Add all refs as commits to start the graph traversal from.
 	 *
 	 * @see #add(AnyObjectId)
 	 * @return {@code this}
 	 * @throws java.io.IOException
 	 *             the references could not be accessed
 	 */
 	public LogCommand all() throws IOException {
 		for (Ref ref : getRepository().getRefDatabase().getRefs()) {
 			if(!ref.isPeeled())
 				ref = getRepository().getRefDatabase().peel(ref);

 			ObjectId objectId = ref.getPeeledObjectId();
 			if (objectId == null)
 				objectId = ref.getObjectId();
 			RevCommit commit = null;
 			try {
 				commit = walk.parseCommit(objectId);
 			} catch (MissingObjectException | IncorrectObjectTypeException e) {
 				// ignore as traversal starting point:
 				// - the ref points to an object that does not exist
 				// - the ref points to an object that is not a commit (e.g. a
 				// tree or a blob)
 			}
 			if (commit != null)
 				add(commit);
 		}
 		return this;
 	}

 	/**
 	 * Show only commits that affect any of the specified paths. The path must
 	 * either name a file or a directory exactly and use <code>/</code> (slash)
 	 * as separator. Note that regex expressions or wildcards are not supported.
 	 *
 	 * @param path
 	 *            a repository-relative path (with <code>/</code> as separator)
 	 * @return {@code this}
 	 */
 	public LogCommand addPath(String path) {
 		checkCallable();
 		pathFilters.add(PathFilter.create(path));
 		return this;
 	}

 	/**
 	 * Show all commits that are not within any of the specified paths. The path
 	 * must either name a file or a directory exactly and use <code>/</code>
 	 * (slash) as separator. Note that regular expressions or wildcards are not
 	 * yet supported. If a path is both added and excluded from the search, then
 	 * the exclusion wins.
 	 *
 	 * @param path
 	 *            a repository-relative path (with <code>/</code> as separator)
 	 * @return {@code this}
 	 * @since 5.6
 	 */
 	public LogCommand excludePath(String path) {
 		checkCallable();
 		excludeTreeFilters.add(PathFilter.create(path).negate());
 		return this;
 	}

 	/**
 	 * Skip the number of commits before starting to show the commit output.
 	 *
 	 * @param skip
 	 *            the number of commits to skip
 	 * @return {@code this}
 	 */
 	public LogCommand setSkip(int skip) {
 		checkCallable();
 		this.skip = skip;
 		return this;
 	}

 	/**
 	 * Limit the number of commits to output.
 	 *
 	 * @param maxCount
 	 *            the limit
 	 * @return {@code this}
 	 */
 	public LogCommand setMaxCount(int maxCount) {
 		checkCallable();
 		this.maxCount = maxCount;
 		return this;
 	}

 	private LogCommand add(boolean include, AnyObjectId start)
 			throws MissingObjectException, IncorrectObjectTypeException,
 			JGitInternalException {
 		checkCallable();
 		try {
 			if (include) {
 				walk.markStart(walk.lookupCommit(start));
 				startSpecified = true;
 			} else
 				walk.markUninteresting(walk.lookupCommit(start));
 			return this;
 		} catch (MissingObjectException | IncorrectObjectTypeException e) {
 			throw e;
 		} catch (IOException e) {
 			throw new JGitInternalException(MessageFormat.format(
 					JGitText.get().exceptionOccurredDuringAddingOfOptionToALogCommand
 					, start), e);
 		}
 	}


 	/**
 	 * Set a filter for the <code>LogCommand</code>.
 	 *
 	 * @param aFilter
 	 *            the filter that this instance of <code>LogCommand</code>
 	 *            should use
 	 * @return {@code this}
 	 * @since 4.4
 	 */
 	public LogCommand setRevFilter(RevFilter aFilter) {
 		checkCallable();
 		this.revFilter = aFilter;
 		return this;
 	}
 }
	/*
	* Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.com> 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.api;

	import java.io.IOException;
	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.List;

	import org.eclipse.jgit.api.errors.GitAPIException;
	import org.eclipse.jgit.api.errors.JGitInternalException;
	import org.eclipse.jgit.api.errors.NoHeadException;
	import org.eclipse.jgit.errors.IncorrectObjectTypeException;
	import org.eclipse.jgit.errors.MissingObjectException;
	import org.eclipse.jgit.internal.JGitText;
	import org.eclipse.jgit.lib.AnyObjectId;
	import org.eclipse.jgit.lib.Constants;
	import org.eclipse.jgit.lib.ObjectId;
	import org.eclipse.jgit.lib.Ref;
	import org.eclipse.jgit.lib.Repository;
	import org.eclipse.jgit.revwalk.RevCommit;
	import org.eclipse.jgit.revwalk.RevWalk;
	import org.eclipse.jgit.revwalk.filter.AndRevFilter;
	import org.eclipse.jgit.revwalk.filter.MaxCountRevFilter;
	import org.eclipse.jgit.revwalk.filter.RevFilter;
	import org.eclipse.jgit.revwalk.filter.SkipRevFilter;
	import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
	import org.eclipse.jgit.treewalk.filter.PathFilter;
	import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
	import org.eclipse.jgit.treewalk.filter.TreeFilter;

	/**
	* A class used to execute a {@code Log} command. It has setters for all
	* supported options and arguments of this command and a {@link #call()} method
	* to finally execute the command. Each instance of this class should only be
	* used for one invocation of the command (means: one call to {@link #call()})
	* <p>
	* Examples (<code>git</code> is a {@link org.eclipse.jgit.api.Git} instance):
	* <p>
	* Get newest 10 commits, starting from the current branch:
	*
	* <pre>
	* ObjectId head = repository.resolve(Constants.HEAD);
	*
	* Iterable<RevCommit> commits = git.log().add(head).setMaxCount(10).call();
	* </pre>
	* <p>
	*
	* Get commits only for a specific file:
	*
	* <pre>
	* git.log().add(head).addPath("dir/filename.txt").call();
	* </pre>
	*
	* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-log.html"
	* >Git documentation about Log</a>
	*/
	public class LogCommand extends GitCommand<Iterable<RevCommit>> {
	private RevWalk walk;

	private boolean startSpecified = false;

	private RevFilter revFilter;

	private final List<PathFilter> pathFilters = new ArrayList<>();
	private final List<TreeFilter> excludeTreeFilters = new ArrayList<>();

	private int maxCount = -1;

	private int skip = -1;

	/**
	* Constructor for LogCommand.
	*
	* @param repo
	* the {@link org.eclipse.jgit.lib.Repository}
	*/
	protected LogCommand(Repository repo) {
	super(repo);
	walk = new RevWalk(repo);
	}

	/**
	* {@inheritDoc}
	* <p>
	* Executes the {@code Log} command with all the options and parameters
	* collected by the setter methods (e.g. {@link #add(AnyObjectId)},
	* {@link #not(AnyObjectId)}, ..) of this class. Each instance of this class
	* should only be used for one invocation of the command. Don't call this
	* method twice on an instance.
	*/
	@Override
	public Iterable<RevCommit> call() throws GitAPIException, NoHeadException {
	checkCallable();
	List<TreeFilter> filters = new ArrayList<>();
	if (!pathFilters.isEmpty()) {
	filters.add(AndTreeFilter.create(PathFilterGroup.create(pathFilters), TreeFilter.ANY_DIFF));
	}
	if (!excludeTreeFilters.isEmpty()) {
	for (TreeFilter f : excludeTreeFilters) {
	filters.add(AndTreeFilter.create(f, TreeFilter.ANY_DIFF));
	}
	}
	if (!filters.isEmpty()) {
	if (filters.size() == 1) {
	filters.add(TreeFilter.ANY_DIFF);
	}
	walk.setTreeFilter(AndTreeFilter.create(filters));

	}
	if (skip > -1 && maxCount > -1)
	walk.setRevFilter(AndRevFilter.create(SkipRevFilter.create(skip),
	MaxCountRevFilter.create(maxCount)));
	else if (skip > -1)
	walk.setRevFilter(SkipRevFilter.create(skip));
	else if (maxCount > -1)
	walk.setRevFilter(MaxCountRevFilter.create(maxCount));
	if (!startSpecified) {
	try {
	ObjectId headId = repo.resolve(Constants.HEAD);
	if (headId == null)
	throw new NoHeadException(
	JGitText.get().noHEADExistsAndNoExplicitStartingRevisionWasSpecified);
	add(headId);
	} catch (IOException e) {
	// all exceptions thrown by add() shouldn't occur and represent
	// severe low-level exception which are therefore wrapped
	throw new JGitInternalException(
	JGitText.get().anExceptionOccurredWhileTryingToAddTheIdOfHEAD,
	e);
	}
	}

	if (this.revFilter != null) {
	walk.setRevFilter(this.revFilter);
	}

	setCallable(false);
	return walk;
	}

	/**
	* Mark a commit to start graph traversal from.
	*
	* @see RevWalk#markStart(RevCommit)
	* @param start
	* the id of the commit to start from
	* @return {@code this}
	* @throws org.eclipse.jgit.errors.MissingObjectException
	* the commit supplied is not available from the object
	* database. This usually indicates the supplied commit is
	* invalid, but the reference was constructed during an earlier
	* invocation to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
	* the object was not parsed yet and it was discovered during
	* parsing that it is not actually a commit. This usually
	* indicates the caller supplied a non-commit SHA-1 to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws JGitInternalException
	* a low-level exception of JGit has occurred. The original
	* exception can be retrieved by calling
	* {@link java.lang.Exception#getCause()}. Expect only
	* {@code IOException's} to be wrapped. Subclasses of
	* {@link java.io.IOException} (e.g.
	* {@link org.eclipse.jgit.errors.MissingObjectException}) are
	* typically not wrapped here but thrown as original exception
	*/
	public LogCommand add(AnyObjectId start) throws MissingObjectException,
	IncorrectObjectTypeException {
	return add(true, start);
	}

	/**
	* Same as {@code --not start}, or {@code ^start}
	*
	* @param start
	* a {@link org.eclipse.jgit.lib.AnyObjectId}
	* @return {@code this}
	* @throws org.eclipse.jgit.errors.MissingObjectException
	* the commit supplied is not available from the object
	* database. This usually indicates the supplied commit is
	* invalid, but the reference was constructed during an earlier
	* invocation to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
	* the object was not parsed yet and it was discovered during
	* parsing that it is not actually a commit. This usually
	* indicates the caller supplied a non-commit SHA-1 to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws JGitInternalException
	* a low-level exception of JGit has occurred. The original
	* exception can be retrieved by calling
	* {@link java.lang.Exception#getCause()}. Expect only
	* {@code IOException's} to be wrapped. Subclasses of
	* {@link java.io.IOException} (e.g.
	* {@link org.eclipse.jgit.errors.MissingObjectException}) are
	* typically not wrapped here but thrown as original exception
	*/
	public LogCommand not(AnyObjectId start) throws MissingObjectException,
	IncorrectObjectTypeException {
	return add(false, start);
	}

	/**
	* Adds the range {@code since..until}
	*
	* @param since
	* a {@link org.eclipse.jgit.lib.AnyObjectId} object.
	* @param until
	* a {@link org.eclipse.jgit.lib.AnyObjectId} object.
	* @return {@code this}
	* @throws org.eclipse.jgit.errors.MissingObjectException
	* the commit supplied is not available from the object
	* database. This usually indicates the supplied commit is
	* invalid, but the reference was constructed during an earlier
	* invocation to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
	* the object was not parsed yet and it was discovered during
	* parsing that it is not actually a commit. This usually
	* indicates the caller supplied a non-commit SHA-1 to
	* {@link org.eclipse.jgit.revwalk.RevWalk#lookupCommit(AnyObjectId)}.
	* @throws JGitInternalException
	* a low-level exception of JGit has occurred. The original
	* exception can be retrieved by calling
	* {@link java.lang.Exception#getCause()}. Expect only
	* {@code IOException's} to be wrapped. Subclasses of
	* {@link java.io.IOException} (e.g.
	* {@link org.eclipse.jgit.errors.MissingObjectException}) are
	* typically not wrapped here but thrown as original exception
	*/
	public LogCommand addRange(AnyObjectId since, AnyObjectId until)
	throws MissingObjectException, IncorrectObjectTypeException {
	return not(since).add(until);
	}

	/**
	* Add all refs as commits to start the graph traversal from.
	*
	* @see #add(AnyObjectId)
	* @return {@code this}
	* @throws java.io.IOException
	* the references could not be accessed
	*/
	public LogCommand all() throws IOException {
	for (Ref ref : getRepository().getRefDatabase().getRefs()) {
	if(!ref.isPeeled())
	ref = getRepository().getRefDatabase().peel(ref);

	ObjectId objectId = ref.getPeeledObjectId();
	if (objectId == null)
	objectId = ref.getObjectId();
	RevCommit commit = null;
	try {
	commit = walk.parseCommit(objectId);
	} catch (MissingObjectException \| IncorrectObjectTypeException e) {
	// ignore as traversal starting point:
	// - the ref points to an object that does not exist
	// - the ref points to an object that is not a commit (e.g. a
	// tree or a blob)
	}
	if (commit != null)
	add(commit);
	}
	return this;
	}

	/**
	* Show only commits that affect any of the specified paths. The path must
	* either name a file or a directory exactly and use <code>/</code> (slash)
	* as separator. Note that regex expressions or wildcards are not supported.
	*
	* @param path
	* a repository-relative path (with <code>/</code> as separator)
	* @return {@code this}
	*/
	public LogCommand addPath(String path) {
	checkCallable();
	pathFilters.add(PathFilter.create(path));
	return this;
	}

	/**
	* Show all commits that are not within any of the specified paths. The path
	* must either name a file or a directory exactly and use <code>/</code>
	* (slash) as separator. Note that regular expressions or wildcards are not
	* yet supported. If a path is both added and excluded from the search, then
	* the exclusion wins.
	*
	* @param path
	* a repository-relative path (with <code>/</code> as separator)
	* @return {@code this}
	* @since 5.6
	*/
	public LogCommand excludePath(String path) {
	checkCallable();
	excludeTreeFilters.add(PathFilter.create(path).negate());
	return this;
	}

	/**
	* Skip the number of commits before starting to show the commit output.
	*
	* @param skip
	* the number of commits to skip
	* @return {@code this}
	*/
	public LogCommand setSkip(int skip) {
	checkCallable();
	this.skip = skip;
	return this;
	}

	/**
	* Limit the number of commits to output.
	*
	* @param maxCount
	* the limit
	* @return {@code this}
	*/
	public LogCommand setMaxCount(int maxCount) {
	checkCallable();
	this.maxCount = maxCount;
	return this;
	}

	private LogCommand add(boolean include, AnyObjectId start)
	throws MissingObjectException, IncorrectObjectTypeException,
	JGitInternalException {
	checkCallable();
	try {
	if (include) {
	walk.markStart(walk.lookupCommit(start));
	startSpecified = true;
	} else
	walk.markUninteresting(walk.lookupCommit(start));
	return this;
	} catch (MissingObjectException \| IncorrectObjectTypeException e) {
	throw e;
	} catch (IOException e) {
	throw new JGitInternalException(MessageFormat.format(
	JGitText.get().exceptionOccurredDuringAddingOfOptionToALogCommand
	, start), e);
	}
	}


	/**
	* Set a filter for the <code>LogCommand</code>.
	*
	* @param aFilter
	* the filter that this instance of <code>LogCommand</code>
	* should use
	* @return {@code this}
	* @since 4.4
	*/
	public LogCommand setRevFilter(RevFilter aFilter) {
	checkCallable();
	this.revFilter = aFilter;
	return this;
	}
	}