Rewrite our build as modular maven components

This refactoring splits the code up into different components, with
their own per-component CLASSPATH.  By moving all of our classes
into isolated components we can better isolate the classpaths and
try to avoid unexpected dependency problems.  It also allows us to
more clearly define which components are used by the GWT UI and
thus must be compiled under GWT, and which components are run on
the server and can therefore use more of the J2SE API.

Change-Id: I833cc22bacc5655d1c9099ed7c2b0e0a5b08855a
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchSetInfoFactory.java

@@ -0,0 +1,117 @@
+// Copyright (C) 2009 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.patch;
+
+import com.google.gerrit.reviewdb.Account;
+import com.google.gerrit.reviewdb.Change;
+import com.google.gerrit.reviewdb.PatchSet;
+import com.google.gerrit.reviewdb.PatchSetInfo;
+import com.google.gerrit.reviewdb.Project;
+import com.google.gerrit.reviewdb.ReviewDb;
+import com.google.gerrit.reviewdb.UserIdentity;
+import com.google.gerrit.server.account.AccountByEmailCache;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.gwtorm.client.OrmException;
+import com.google.gwtorm.client.SchemaFactory;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.PersonIdent;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
+
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.Set;
+
+
+/**
+ * Factory class creating PatchSetInfo from meta-data found in Git repository.
+ */
+@Singleton
+public class PatchSetInfoFactory {
+  private final GitRepositoryManager repoManager;
+  private final SchemaFactory<ReviewDb> schemaFactory;
+  private final AccountByEmailCache byEmailCache;
+
+  @Inject
+  public PatchSetInfoFactory(final GitRepositoryManager grm,
+      final SchemaFactory<ReviewDb> schemaFactory,
+      final AccountByEmailCache byEmailCache) {
+    this.repoManager = grm;
+    this.schemaFactory = schemaFactory;
+    this.byEmailCache = byEmailCache;
+  }
+
+  public PatchSetInfo get(RevCommit src, PatchSet.Id psi) {
+    PatchSetInfo info = new PatchSetInfo(psi);
+    info.setSubject(src.getShortMessage());
+    info.setMessage(src.getFullMessage());
+    info.setAuthor(toUserIdentity(src.getAuthorIdent()));
+    info.setCommitter(toUserIdentity(src.getCommitterIdent()));
+
+    return info;
+  }
+
+  public PatchSetInfo get(PatchSet.Id patchSetId)
+      throws PatchSetInfoNotAvailableException {
+    ReviewDb db = null;
+    Repository repo = null;
+    try {
+      db = schemaFactory.open();
+      final PatchSet patchSet = db.patchSets().get(patchSetId);
+      final Change change = db.changes().get(patchSet.getId().getParentKey());
+      final Project.NameKey projectKey = change.getProject();
+      final String projectName = projectKey.get();
+      repo = repoManager.openRepository(projectName);
+      final RevWalk rw = new RevWalk(repo);
+      final RevCommit src =
+          rw.parseCommit(ObjectId.fromString(patchSet.getRevision().get()));
+      return get(src, patchSetId);
+    } catch (OrmException e) {
+      throw new PatchSetInfoNotAvailableException(e);
+    } catch (IOException e) {
+      throw new PatchSetInfoNotAvailableException(e);
+    } finally {
+      if (db != null) {
+        db.close();
+      }
+      if (repo != null) {
+        repo.close();
+      }
+    }
+  }
+
+  private UserIdentity toUserIdentity(final PersonIdent who) {
+    final UserIdentity u = new UserIdentity();
+    u.setName(who.getName());
+    u.setEmail(who.getEmailAddress());
+    u.setDate(new Timestamp(who.getWhen().getTime()));
+    u.setTimeZone(who.getTimeZoneOffset());
+
+    // If only one account has access to this email address, select it
+    // as the identity of the user.
+    //
+    final Set<Account.Id> a = byEmailCache.get(u.getEmail());
+    if (a.size() == 1) {
+      u.setAccount(a.iterator().next());
+    }
+
+    return u;
+  }
+
+}