org.eclipse.mylyn.internal.gerrit.ui.egit.GitFileRevisionUtils.java Source code

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Here is the source code for org.eclipse.mylyn.internal.gerrit.ui.egit.GitFileRevisionUtils.java

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/*******************************************************************************
 * Copyright (c) 2013, Ericsson AB and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Sebastien Dubois (Ericsson) - Adapted to use with Mylyn Reviews
 *******************************************************************************/

package org.eclipse.mylyn.internal.gerrit.ui.egit;

import java.io.InputStream;

import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.mylyn.internal.reviews.ui.compare.CompareUtil;
import org.eclipse.mylyn.reviews.core.model.IFileVersion;
import org.eclipse.team.core.history.IFileRevision;

/**
 * A collection of common utility functions used to resolve the Git File Revisions
 * 
 * @author Sebastien Dubois
 */
public class GitFileRevisionUtils {

    //Needed to identify this plug-in, since there is no activator for it.
    private static String PLUGIN_ID = "org.eclipse.mylyn.reviews.core"; //$NON-NLS-1$

    public static IFileRevision getFileRevision(final Repository repository, final IFileVersion reviewFileVersion) {
        IFileRevision gitFileRevision = null;

        if (reviewFileVersion != null && reviewFileVersion.getPath() != null) {
            //Get SHA-1 for the file revision to look for the correct file revision in the Git repository
            ObjectInserter inserter = repository.newObjectInserter();
            String id = inserter.idFor(Constants.OBJ_BLOB, CompareUtil.getContent(reviewFileVersion)).getName();
            inserter.release();
            if (id != null) {
                final ObjectId objId = ObjectId.fromString(id);
                if (objId != null) {
                    final IPath path = Path.fromPortableString(reviewFileVersion.getPath());
                    gitFileRevision = new org.eclipse.team.core.history.provider.FileRevision() {

                        public IFileRevision withAllProperties(IProgressMonitor monitor) throws CoreException {
                            return this;
                        }

                        public boolean isPropertyMissing() {
                            return false;
                        }

                        public IStorage getStorage(IProgressMonitor monitor) throws CoreException {
                            return getFileRevisionStorage(null, repository, path, objId);
                        }

                        public String getName() {
                            return path.lastSegment();
                        }
                    };
                }
            }
        }
        return gitFileRevision;
    }

    private static IStorage getFileRevisionStorage(final IProgressMonitor monitor, final Repository repository,
            final IPath path, final ObjectId objId) {

        return new IStorage() {
            @SuppressWarnings("rawtypes")
            public Object getAdapter(Class adapter) {
                return null;
            }

            public boolean isReadOnly() {
                return true;
            }

            public String getName() {
                return path.lastSegment();
            }

            public IPath getFullPath() {
                //Here we append the object Id to the path to distinguish it from the path of this file revision 
                //from the  workspace file.  This is  needed to get good AST resolution and navigability.
                return path.append(Path.fromPortableString(objId.getName()));
            }

            public InputStream getContents() throws CoreException {
                InputStream in = null;
                try {
                    in = getBlobContent(monitor, repository, objId);
                } catch (Exception e) {
                    throw new CoreException(new Status(IStatus.ERROR, PLUGIN_ID, e.getMessage()));
                }
                return in;
            }
        };
    }

    private static InputStream getBlobContent(final IProgressMonitor monitor, final Repository repository,
            final ObjectId objId) throws CoreException {
        InputStream resStream = null;
        try {
            resStream = repository.open(objId, Constants.OBJ_BLOB).openStream();
        } catch (Exception e) {
            throw new CoreException(new Status(IStatus.ERROR, PLUGIN_ID, e.getMessage()));
        }
        return resStream;
    }
}