001package org.apache.maven.scm.provider.git.jgit.command.branch;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 * http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import org.apache.maven.scm.ScmException;
023import org.apache.maven.scm.ScmFile;
024import org.apache.maven.scm.ScmFileSet;
025import org.apache.maven.scm.ScmFileStatus;
026import org.apache.maven.scm.ScmResult;
027import org.apache.maven.scm.command.branch.AbstractBranchCommand;
028import org.apache.maven.scm.command.branch.BranchScmResult;
029import org.apache.maven.scm.provider.ScmProviderRepository;
030import org.apache.maven.scm.provider.git.command.GitCommand;
031import org.apache.maven.scm.provider.git.jgit.command.JGitUtils;
032import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
033import org.codehaus.plexus.util.StringUtils;
034import org.eclipse.jgit.api.Git;
035import org.eclipse.jgit.api.errors.GitAPIException;
036import org.eclipse.jgit.lib.Constants;
037import org.eclipse.jgit.lib.Ref;
038import org.eclipse.jgit.lib.Repository;
039import org.eclipse.jgit.revwalk.RevCommit;
040import org.eclipse.jgit.revwalk.RevWalk;
041import org.eclipse.jgit.transport.RefSpec;
042import org.eclipse.jgit.treewalk.TreeWalk;
043
044import java.util.ArrayList;
045import java.util.HashSet;
046import java.util.Iterator;
047import java.util.List;
048import java.util.Set;
049
050/**
051 * @author Dominik Bartholdi (imod)
052 * @since 1.9
053 */
054public class JGitBranchCommand
055    extends AbstractBranchCommand
056    implements GitCommand
057{
058
059    /**
060     * {@inheritDoc}
061     */
062    @Override
063    protected ScmResult executeBranchCommand( ScmProviderRepository repo, ScmFileSet fileSet, String branch,
064                                              String message )
065        throws ScmException
066    {
067        if ( branch == null || StringUtils.isEmpty( branch.trim() ) )
068        {
069            throw new ScmException( "branch name must be specified" );
070        }
071
072        if ( !fileSet.getFileList().isEmpty() )
073        {
074            throw new ScmException( "This provider doesn't support branching subsets of a directory" );
075        }
076
077        Git git = null;
078        try
079        {
080            git = JGitUtils.openRepo( fileSet.getBasedir() );
081            Ref branchResult = git.branchCreate().setName( branch ).call();
082            getLogger().info( "created [" + branchResult.getName() + "]" );
083
084            if ( getLogger().isDebugEnabled() )
085            {
086                for ( String branchName : getShortLocalBranchNames( git ) )
087                {
088                    getLogger().debug( "local branch available: " + branchName );
089                }
090            }
091
092            if ( repo.isPushChanges() )
093            {
094                getLogger().info( "push branch [" + branch + "] to remote..." );
095                JGitUtils.push( getLogger(), git, (GitScmProviderRepository) repo, new RefSpec( Constants.R_HEADS
096                    + branch ) );
097            }
098
099            // search for the tagged files
100            final RevWalk revWalk = new RevWalk( git.getRepository() );
101            RevCommit commit = revWalk.parseCommit( branchResult.getObjectId() );
102            revWalk.release();
103
104            final TreeWalk walk = new TreeWalk( git.getRepository() );
105            walk.reset(); // drop the first empty tree, which we do not need here
106            walk.setRecursive( true );
107            walk.addTree( commit.getTree() );
108
109            List<ScmFile> files = new ArrayList<ScmFile>();
110            while ( walk.next() )
111            {
112                files.add( new ScmFile( walk.getPathString(), ScmFileStatus.CHECKED_OUT ) );
113            }
114            walk.release();
115
116            return new BranchScmResult( "JGit branch", files );
117
118        }
119        catch ( Exception e )
120        {
121            throw new ScmException( "JGit branch failed!", e );
122        }
123        finally
124        {
125            JGitUtils.closeRepo( git );
126        }
127    }
128
129    /**
130     * gets a set of names of the available branches in the given repo
131     * 
132     * @param git the repo to list the branches for
133     * @return set of short branch names
134     * @throws GitAPIException
135     */
136    public static Set<String> getShortLocalBranchNames( Git git )
137        throws GitAPIException
138    {
139        Set<String> branches = new HashSet<String>();
140        Iterator<Ref> iter = git.branchList().call().iterator();
141        while ( iter.hasNext() )
142        {
143            branches.add( Repository.shortenRefName( iter.next().getName() ) );
144        }
145        return branches;
146    }
147}