org.eclipse.orion.server.git.servlets.GitBlameHandlerV1.java Source code

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Here is the source code for org.eclipse.orion.server.git.servlets.GitBlameHandlerV1.java

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/*******************************************************************************
 * Copyright (c) 2013, 2014 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.orion.server.git.servlets;

import java.io.IOException;
import java.net.URI;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.jgit.api.BlameCommand;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.blame.BlameResult;
import org.eclipse.jgit.diff.RawTextComparator;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.orion.internal.server.servlets.ServletResourceHandler;
import org.eclipse.orion.server.core.ServerStatus;
import org.eclipse.orion.server.git.BaseToCloneConverter;
import org.eclipse.orion.server.git.objects.Blame;
import org.eclipse.orion.server.servlets.JsonURIUnqualificationStrategy;
import org.eclipse.orion.server.servlets.OrionServlet;
import org.eclipse.osgi.util.NLS;

public class GitBlameHandlerV1 extends AbstractGitHandler {

    GitBlameHandlerV1(ServletResourceHandler<IStatus> statusHandler) {
        super(statusHandler);
    }

    @Override
    protected boolean handleGet(RequestInfo requestInfo) throws ServletException {
        HttpServletRequest request = requestInfo.request;
        HttpServletResponse response = requestInfo.response;

        try {

            URI cloneLocation = BaseToCloneConverter.getCloneLocation(getURI(request), BaseToCloneConverter.BLAME);

            Path Filepath = new Path(requestInfo.filePath.toString());
            if (Filepath.hasTrailingSeparator()) {
                String msg = NLS.bind("Cannot get blame Information on a folder: {0}",
                        requestInfo.filePath.toString());
                return statusHandler.handleRequest(request, response,
                        new ServerStatus(IStatus.ERROR, HttpServletResponse.SC_BAD_REQUEST, msg, null));
            }

            Blame blame = new Blame(cloneLocation, requestInfo.db);

            String gitSegment = requestInfo.gitSegment;
            if (!gitSegment.equalsIgnoreCase("HEAD") && !gitSegment.equalsIgnoreCase("master")) {
                ObjectId id = ObjectId.fromString(requestInfo.gitSegment);
                blame.setStartCommit(id);
            }

            String path = requestInfo.relativePath;
            blame.setFilePath(path);
            blame.setBlameLocation(getURI(request));
            doBlame(blame, requestInfo.db);
            OrionServlet.writeJSONResponse(request, response, blame.toJSON(),
                    JsonURIUnqualificationStrategy.ALL_NO_GIT);
            return true;
        } catch (Exception e) {
            return statusHandler.handleRequest(request, response, new ServerStatus(IStatus.ERROR,
                    HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Error generating blame response", e));
        }
    }

    public void doBlame(Blame blame, Repository db) throws GitAPIException, IOException {

        String filePath = blame.getFilePath();

        if (db != null && filePath != null) {

            BlameCommand blameCommand = new BlameCommand(db);
            blameCommand.setFilePath(filePath);
            blameCommand.setFollowFileRenames(true);
            blameCommand.setTextComparator(RawTextComparator.WS_IGNORE_ALL);

            if (blame.getStartCommit() != null) {
                blameCommand.setStartCommit(blame.getStartCommit());
            }
            BlameResult result;

            try {
                result = blameCommand.call();
            } catch (Exception e1) {
                return;
            }
            if (result != null) {
                blame.clearLines();
                RevCommit commit;
                RevCommit prevCommit = null;
                String path;
                String prevPath = null;
                for (int i = 0; i < result.getResultContents().size(); i++) {
                    try {
                        commit = result.getSourceCommit(i);
                        prevCommit = commit;
                    } catch (NullPointerException e) {
                        commit = prevCommit;
                    }

                    if (!blame.commitExists(commit)) {
                        if (commit != null) {
                            blame.addCommit(commit);
                        }
                    }

                    try {
                        path = commit.getId().getName();
                        prevPath = path;
                    } catch (NullPointerException e) {
                        path = prevPath;
                    }
                    blame.addLine(path);
                }
            }
        }
    }

}