com.google.gerrit.server.query.change.RevWalkPredicate.java Source code

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Here is the source code for com.google.gerrit.server.query.change.RevWalkPredicate.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.query.change;

import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RevId;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.query.OperatorPredicate;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Provider;

import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevWalk;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * Predicate which creates Repository, RevWalk objects and properly
 * closes them. Git based operators should extend this predicate.
 *
 */
public abstract class RevWalkPredicate extends OperatorPredicate<ChangeData> {
    private static final Logger log = LoggerFactory.getLogger(RevWalkPredicate.class);

    public static class Arguments {
        public final PatchSet patchSet;
        public final RevId revision;
        public final AnyObjectId objectId;
        public final Change change;
        public final Project.NameKey projectName;

        public Arguments(PatchSet patchSet, RevId revision, AnyObjectId objectId, Change change,
                Project.NameKey projectName) {
            this.patchSet = patchSet;
            this.revision = revision;
            this.objectId = objectId;
            this.change = change;
            this.projectName = projectName;
        }
    }

    public final Provider<ReviewDb> db;
    public final GitRepositoryManager repoManager;

    public RevWalkPredicate(Provider<ReviewDb> db, GitRepositoryManager repoManager, String operator, String ref) {
        super(operator, ref);
        this.db = db;
        this.repoManager = repoManager;
    }

    @Override
    public boolean match(ChangeData object) throws OrmException {
        final PatchSet patchSet = object.currentPatchSet();
        if (patchSet == null) {
            return false;
        }

        final RevId revision = patchSet.getRevision();
        if (revision == null) {
            return false;
        }

        final AnyObjectId objectId = ObjectId.fromString(revision.get());
        if (objectId == null) {
            return false;
        }

        Change change = object.change();
        if (change == null) {
            return false;
        }

        final Project.NameKey projectName = change.getProject();
        if (projectName == null) {
            return false;
        }

        Arguments args = new Arguments(patchSet, revision, objectId, change, projectName);

        try {
            final Repository repo = repoManager.openRepository(projectName);
            try {
                final RevWalk rw = new RevWalk(repo);
                try {
                    return match(repo, rw, args);
                } finally {
                    rw.release();
                }
            } finally {
                repo.close();
            }
        } catch (RepositoryNotFoundException e) {
            log.error("Repository \"" + projectName.get() + "\" unknown.", e);
        } catch (IOException e) {
            log.error(projectName.get() + " cannot be read as a repository", e);
        }
        return false;
    }

    public abstract boolean match(Repository repo, RevWalk rw, Arguments args);
}