com.google.gerrit.server.project.SetHead.java Source code

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Here is the source code for com.google.gerrit.server.project.SetHead.java

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// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.server.project;

import com.google.common.base.Strings;
import com.google.gerrit.extensions.events.HeadUpdatedListener;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.DefaultInput;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.project.SetHead.Input;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;

import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Map;

@Singleton
public class SetHead implements RestModifyView<ProjectResource, Input> {
    private static final Logger log = LoggerFactory.getLogger(SetHead.class);

    public static class Input {
        @DefaultInput
        public String ref;
    }

    private final GitRepositoryManager repoManager;
    private final Provider<IdentifiedUser> identifiedUser;
    private final DynamicSet<HeadUpdatedListener> headUpdatedListener;

    @Inject
    SetHead(GitRepositoryManager repoManager, Provider<IdentifiedUser> identifiedUser,
            DynamicSet<HeadUpdatedListener> headUpdatedListener) {
        this.repoManager = repoManager;
        this.identifiedUser = identifiedUser;
        this.headUpdatedListener = headUpdatedListener;
    }

    @Override
    public String apply(final ProjectResource rsrc, Input input) throws AuthException, ResourceNotFoundException,
            BadRequestException, UnprocessableEntityException, IOException {
        if (!rsrc.getControl().isOwner()) {
            throw new AuthException("restricted to project owner");
        }
        if (input == null || Strings.isNullOrEmpty(input.ref)) {
            throw new BadRequestException("ref required");
        }
        String ref = RefNames.fullName(input.ref);

        try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
            Map<String, Ref> cur = repo.getRefDatabase().exactRef(Constants.HEAD, ref);
            if (!cur.containsKey(ref)) {
                throw new UnprocessableEntityException(String.format("Ref Not Found: %s", ref));
            }

            final String oldHead = cur.get(Constants.HEAD).getTarget().getName();
            final String newHead = ref;
            if (!oldHead.equals(newHead)) {
                final RefUpdate u = repo.updateRef(Constants.HEAD, true);
                u.setRefLogIdent(identifiedUser.get().newRefLogIdent());
                RefUpdate.Result res = u.link(newHead);
                switch (res) {
                case NO_CHANGE:
                case RENAMED:
                case FORCED:
                case NEW:
                    break;
                default:
                    throw new IOException("Setting HEAD failed with " + res);
                }

                HeadUpdatedListener.Event event = new HeadUpdatedListener.Event() {
                    @Override
                    public String getProjectName() {
                        return rsrc.getNameKey().get();
                    }

                    @Override
                    public String getOldHeadName() {
                        return oldHead;
                    }

                    @Override
                    public String getNewHeadName() {
                        return newHead;
                    }
                };
                for (HeadUpdatedListener l : headUpdatedListener) {
                    try {
                        l.onHeadUpdated(event);
                    } catch (RuntimeException e) {
                        log.warn("Failure in HeadUpdatedListener", e);
                    }
                }
            }
            return ref;
        } catch (RepositoryNotFoundException e) {
            throw new ResourceNotFoundException(rsrc.getName());
        }
    }
}