com.google.gerrit.httpd.rpc.changedetail.IncludedInDetailFactory.java Source code

Introduction

Here is the source code for com.google.gerrit.httpd.rpc.changedetail.IncludedInDetailFactory.java

Source

// Copyright (C) 2010 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.httpd.rpc.changedetail;

import com.google.gerrit.common.data.IncludedInDetail;
import com.google.gerrit.common.errors.InvalidRevisionException;
import com.google.gerrit.httpd.rpc.Handler;
import com.google.gerrit.reviewdb.Change;
import com.google.gerrit.reviewdb.PatchSet;
import com.google.gerrit.reviewdb.ReviewDb;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.project.ChangeControl;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gwtorm.client.OrmException;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;

import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/** Creates a {@link IncludedInDetail} of a {@link Change}. */
class IncludedInDetailFactory extends Handler<IncludedInDetail> {
    private static final Logger log = LoggerFactory.getLogger(IncludedInDetailFactory.class);

    interface Factory {
        IncludedInDetailFactory create(Change.Id id);
    }

    private final ReviewDb db;
    private final ChangeControl.Factory changeControlFactory;
    private final GitRepositoryManager repoManager;
    private final Change.Id changeId;

    private IncludedInDetail detail;
    private ChangeControl control;

    @Inject
    IncludedInDetailFactory(final ReviewDb db, final ChangeControl.Factory changeControlFactory,
            final GitRepositoryManager repoManager, @Assisted final Change.Id changeId) {
        this.changeControlFactory = changeControlFactory;
        this.repoManager = repoManager;
        this.changeId = changeId;
        this.db = db;
    }

    @Override
    public IncludedInDetail call()
            throws OrmException, NoSuchChangeException, IOException, InvalidRevisionException {
        control = changeControlFactory.validateFor(changeId);

        final PatchSet patch = db.patchSets().get(control.getChange().currentPatchSetId());
        final Repository repo = repoManager.openRepository(control.getProject().getNameKey());
        try {
            final RevWalk rw = new RevWalk(repo);
            try {
                rw.setRetainBody(false);

                final RevCommit rev;
                try {
                    rev = rw.parseCommit(ObjectId.fromString(patch.getRevision().get()));
                } catch (IncorrectObjectTypeException err) {
                    throw new InvalidRevisionException();
                } catch (MissingObjectException err) {
                    throw new InvalidRevisionException();
                }

                detail = new IncludedInDetail();
                detail.setBranches(includedIn(repo, rw, rev, Constants.R_HEADS));
                detail.setTags(includedIn(repo, rw, rev, Constants.R_TAGS));

                return detail;
            } finally {
                rw.release();
            }
        } finally {
            repo.close();
        }
    }

    private List<String> includedIn(final Repository repo, final RevWalk rw, final RevCommit rev,
            final String namespace) throws IOException, MissingObjectException, IncorrectObjectTypeException {
        final List<String> result = new ArrayList<String>();
        for (final Ref ref : repo.getRefDatabase().getRefs(namespace).values()) {
            final RevCommit tip;
            try {
                tip = rw.parseCommit(ref.getObjectId());
            } catch (IncorrectObjectTypeException notCommit) {
                // Its OK for a tag reference to point to a blob or a tree, this
                // is common in the Linux kernel or git.git repository.
                //
                continue;
            } catch (MissingObjectException notHere) {
                // Log the problem with this branch, but keep processing.
                //
                log.warn("Reference " + ref.getName() + " in " + repo.getDirectory() + " points to dangling object "
                        + ref.getObjectId());
                continue;
            }

            if (rw.isMergedInto(rev, tip)) {
                result.add(ref.getName().substring(namespace.length()));
            }
        }
        return result;
    }
}