Java tutorial
/* * Copyright (C) 2008-2010, 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.jboss.forge.git; import java.io.File; import java.io.IOException; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import org.eclipse.jgit.dircache.DirCache; import org.eclipse.jgit.dircache.DirCacheCheckout; import org.eclipse.jgit.errors.IncorrectObjectTypeException; import org.eclipse.jgit.errors.MissingObjectException; import org.eclipse.jgit.errors.NotSupportedException; import org.eclipse.jgit.errors.TransportException; import org.eclipse.jgit.lib.Constants; import org.eclipse.jgit.lib.Ref; import org.eclipse.jgit.lib.RefComparator; import org.eclipse.jgit.lib.RefUpdate; import org.eclipse.jgit.lib.TextProgressMonitor; import org.eclipse.jgit.pgm.CLIText; import org.eclipse.jgit.pgm.Die; import org.eclipse.jgit.revwalk.RevCommit; import org.eclipse.jgit.revwalk.RevWalk; import org.eclipse.jgit.storage.file.FileBasedConfig; import org.eclipse.jgit.storage.file.FileRepository; import org.eclipse.jgit.transport.FetchResult; import org.eclipse.jgit.transport.RefSpec; import org.eclipse.jgit.transport.RemoteConfig; import org.eclipse.jgit.transport.TagOpt; import org.eclipse.jgit.transport.Transport; import org.eclipse.jgit.transport.URIish; /** * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a> * */ public class Clone { private final String remoteName = Constants.DEFAULT_REMOTE_NAME; private FileRepository db; public void run(File projectDir, String sourceUri) throws IOException { try { final URIish uri = new URIish(sourceUri); File gitdir = new File(projectDir, Constants.DOT_GIT); db = new FileRepository(gitdir); db.create(); final FileBasedConfig dstcfg = db.getConfig(); dstcfg.setBoolean("core", null, "bare", false); dstcfg.save(); saveRemote(uri); final FetchResult r = runFetch(); final Ref branch = guessHEAD(r); doCheckout(branch); } catch (URISyntaxException e) { throw new IllegalArgumentException("Failed to parse remote repository URI", e); } } private void saveRemote(final URIish uri) throws URISyntaxException, IOException { final FileBasedConfig dstcfg = db.getConfig(); final RemoteConfig rc = new RemoteConfig(dstcfg, remoteName); rc.addURI(uri); rc.addFetchRefSpec(new RefSpec().setForceUpdate(true).setSourceDestination(Constants.R_HEADS + "*", Constants.R_REMOTES + remoteName + "/*")); rc.update(dstcfg); dstcfg.save(); } private FetchResult runFetch() throws NotSupportedException, URISyntaxException, TransportException { final Transport tn = Transport.open(db, remoteName); final FetchResult r; try { tn.setTagOpt(TagOpt.FETCH_TAGS); r = tn.fetch(new TextProgressMonitor(), null); } finally { tn.close(); } return r; } private Ref guessHEAD(final FetchResult result) { final Ref idHEAD = result.getAdvertisedRef(Constants.HEAD); final List<Ref> availableRefs = new ArrayList<Ref>(); Ref head = null; for (final Ref r : result.getAdvertisedRefs()) { final String n = r.getName(); if (!n.startsWith(Constants.R_HEADS)) continue; availableRefs.add(r); if (idHEAD == null || head != null) continue; if (r.getObjectId().equals(idHEAD.getObjectId())) head = r; } Collections.sort(availableRefs, RefComparator.INSTANCE); if (idHEAD != null && head == null) head = idHEAD; return head; } private void doCheckout(final Ref branch) throws IOException { if (branch == null) throw new Die(CLIText.get().cannotChekoutNoHeadsAdvertisedByRemote); if (!Constants.HEAD.equals(branch.getName())) { RefUpdate u = db.updateRef(Constants.HEAD); u.disableRefLog(); u.link(branch.getName()); } final RevCommit commit = parseCommit(branch); final RefUpdate u = db.updateRef(Constants.HEAD); u.setNewObjectId(commit); u.forceUpdate(); DirCache dc = db.lockDirCache(); DirCacheCheckout co = new DirCacheCheckout(db, dc, commit.getTree()); co.checkout(); } private RevCommit parseCommit(final Ref branch) throws MissingObjectException, IncorrectObjectTypeException, IOException { final RevWalk rw = new RevWalk(db); final RevCommit commit; try { commit = rw.parseCommit(branch.getObjectId()); } finally { rw.release(); } return commit; } }