org.eclipse.orion.server.git.BaseToBranchConverter.java Source code

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

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/*******************************************************************************
 * Copyright (c) 2011 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;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.runtime.*;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.RepositoryCache;
import org.eclipse.jgit.util.FS;
import org.eclipse.orion.internal.server.servlets.file.NewFileServlet;
import org.eclipse.orion.server.git.servlets.GitServlet;

public abstract class BaseToBranchConverter {

    public static final BaseToBranchConverter FILE = new BaseToBranchConverter() {
        @Override
        public IPath getFilePath(URI base) throws URISyntaxException {
            return new Path(base.getPath()).makeRelative();
        };
    };

    public static final BaseToBranchConverter REMOTE = new BaseToBranchConverter() {
        @Override
        public IPath getFilePath(URI base) throws URISyntaxException {
            return new Path(base.getPath()).removeFirstSegments(3).makeRelative();
        };
    };

    public static URI getBranchLocation(URI base, BaseToBranchConverter converter)
            throws IOException, URISyntaxException, CoreException {
        IPath filePath = converter.getFilePath(base);
        IPath clonePath = findClonePath(filePath);
        if (clonePath == null)
            return null;
        IPath p = new Path(GitServlet.GIT_URI).append(GitConstants.BRANCH_RESOURCE).append("file").append(clonePath)
                .addTrailingSeparator();
        return new URI(base.getScheme(), base.getUserInfo(), base.getHost(), base.getPort(), p.toString(),
                base.getQuery(), base.getFragment());
    }

    public abstract IPath getFilePath(URI base) throws URISyntaxException;

    private static IPath findClonePath(IPath filePath) throws CoreException {
        // /file/{projectId}[/{path}] -> /{projectId}[/{path}]
        IPath p = filePath.removeFirstSegments(1);
        while (p.segmentCount() > 0) {
            IFileStore fileStore = NewFileServlet.getFileStore(p);
            if (fileStore == null)
                return null;
            File file = fileStore.toLocalFile(EFS.NONE, null);
            if (RepositoryCache.FileKey.isGitRepository(new File(file, Constants.DOT_GIT), FS.DETECTED)) {
                return p;
            }
            p = p.removeLastSegments(1);
        }
        return null;
    }
}