org.eclipse.jgit.internal.storage.dfs.DfsRepository.java Source code

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Here is the source code for org.eclipse.jgit.internal.storage.dfs.DfsRepository.java

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/*
 * Copyright (C) 2011, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.internal.storage.dfs;

import java.io.IOException;
import java.io.InputStream;
import java.text.MessageFormat;
import java.util.Collections;

import org.eclipse.jgit.attributes.AttributesNode;
import org.eclipse.jgit.attributes.AttributesNodeProvider;
import org.eclipse.jgit.attributes.AttributesRule;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.ReflogReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;

/**
 * A Git repository on a DFS.
 */
public abstract class DfsRepository extends Repository {
    private final DfsConfig config;

    private final DfsRepositoryDescription description;

    /**
     * Initialize a DFS repository.
     *
     * @param builder
     *            description of the repository.
     */
    protected DfsRepository(DfsRepositoryBuilder builder) {
        super(builder);
        this.config = new DfsConfig();
        this.description = builder.getRepositoryDescription();
    }

    /** {@inheritDoc} */
    @Override
    public abstract DfsObjDatabase getObjectDatabase();

    /**
     * Get the description of this repository.
     *
     * @return the description of this repository.
     */
    public DfsRepositoryDescription getDescription() {
        return description;
    }

    /**
     * Check if the repository already exists.
     *
     * @return true if the repository exists; false if it is new.
     * @throws java.io.IOException
     *             the repository cannot be checked.
     */
    public boolean exists() throws IOException {
        if (getRefDatabase() instanceof DfsRefDatabase) {
            return ((DfsRefDatabase) getRefDatabase()).exists();
        }
        return true;
    }

    /** {@inheritDoc} */
    @Override
    public void create(boolean bare) throws IOException {
        if (exists())
            throw new IOException(MessageFormat.format(JGitText.get().repositoryAlreadyExists, "")); //$NON-NLS-1$

        String master = Constants.R_HEADS + Constants.MASTER;
        RefUpdate.Result result = updateRef(Constants.HEAD, true).link(master);
        if (result != RefUpdate.Result.NEW)
            throw new IOException(result.name());
    }

    /** {@inheritDoc} */
    @Override
    public StoredConfig getConfig() {
        return config;
    }

    /** {@inheritDoc} */
    @Override
    public String getIdentifier() {
        return getDescription().getRepositoryName();
    }

    /** {@inheritDoc} */
    @Override
    public void scanForRepoChanges() throws IOException {
        getRefDatabase().refresh();
        getObjectDatabase().clearCache();
    }

    /** {@inheritDoc} */
    @Override
    public void notifyIndexChanged(boolean internal) {
        // Do not send notifications.
        // There is no index, as there is no working tree.
    }

    /** {@inheritDoc} */
    @Override
    public ReflogReader getReflogReader(String refName) throws IOException {
        throw new UnsupportedOperationException();
    }

    /** {@inheritDoc} */
    @Override
    public AttributesNodeProvider createAttributesNodeProvider() {
        // TODO Check if the implementation used in FileRepository can be used
        // for this kind of repository
        return new EmptyAttributesNodeProvider();
    }

    private static class EmptyAttributesNodeProvider implements AttributesNodeProvider {
        private EmptyAttributesNode emptyAttributesNode = new EmptyAttributesNode();

        @Override
        public AttributesNode getInfoAttributesNode() throws IOException {
            return emptyAttributesNode;
        }

        @Override
        public AttributesNode getGlobalAttributesNode() throws IOException {
            return emptyAttributesNode;
        }

        private static class EmptyAttributesNode extends AttributesNode {

            public EmptyAttributesNode() {
                super(Collections.<AttributesRule>emptyList());
            }

            @Override
            public void parse(InputStream in) throws IOException {
                // Do nothing
            }
        }
    }
}