co.turnus.versioning.impl.GitVersioner.java Source code

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Here is the source code for co.turnus.versioning.impl.GitVersioner.java

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/* 
 * TURNUS, the co-exploration framework
 * 
 * Copyright (C) 2014 EPFL SCI STI MM
 *
 * This file is part of TURNUS.
 *
 * TURNUS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * TURNUS is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with TURNUS.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Additional permission under GNU GPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or combining it
 * with Eclipse (or a modified version of Eclipse or an Eclipse plugin or 
 * an Eclipse library), containing parts covered by the terms of the 
 * Eclipse Public License (EPL), the licensors of this Program grant you 
 * additional permission to convey the resulting work.  Corresponding Source 
 * for a non-source form of such a combination shall include the source code 
 * for the parts of Eclipse libraries used as well as that of the  covered work.
 * 
 */
package co.turnus.versioning.impl;

import java.io.File;
import java.util.Date;

import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.FileRepositoryBuilder;

import co.turnus.versioning.Version;
import co.turnus.versioning.Versioner;
import co.turnus.versioning.VersioningFactory;

public class GitVersioner implements Versioner {

    public static final String NAME = "Git Versioner";

    private Date getLastModifiedDate(File file, Repository repo, ObjectId revId) {
        if (file.exists()) {
            return new Date(file.lastModified());
        } else {
            try {
                RevWalk walk = new RevWalk(repo);
                RevCommit commit = walk.parseCommit(revId);
                return commit.getAuthorIdent().getWhen();
            } catch (Exception e) {
            }
        }
        return new Date();
    }

    @Override
    public String getName() {
        return NAME;
    }

    private String getRevision(ObjectId revision) {
        String rev = revision.getName();
        return rev != null ? rev : "";
    }

    @Override
    public Version getVersion(File file) {
        if (file == null) {
            return new SimpleFileVersioner().getVersion(file);
        }

        Repository repo = searchNearestRepository(file);
        if (repo != null) {
            try {
                ObjectId revId = repo.resolve(Constants.HEAD);
                Date mdofifDate = getLastModifiedDate(file, repo, revId);
                String revision = getRevision(revId);

                Version v = VersioningFactory.eINSTANCE.createVersion();
                v.setVersioningDate(new Date());
                v.setLastModificationDate(mdofifDate);
                v.setAttribute("versioner", NAME);
                v.setId(revision);
                return v;

            } catch (Exception e) {
            }
        }

        return new SimpleFileVersioner().getVersion(file);
    }

    private Repository searchNearestRepository(File file) {
        if (file == null) {
            return null;
        } else if (file.exists()) {
            try {
                Repository repo = new FileRepositoryBuilder().findGitDir(file.getCanonicalFile()).build();
                ObjectId revision = repo.resolve(Constants.HEAD);
                if (revision != null) {
                    return repo;
                }
            } catch (Exception e) {
            }
        }
        return searchNearestRepository(file.getParentFile());
    }

}