Move ChangeUtil#getMessage method into GetContent

GetContent is the only caller of this method. Having this method moved
out of ChangeUtil will allow us to make ChangeUtil just be a
collection of static methods once Revert is converted to use
BatchUpdate.

Change-Id: I577249644032bde7d51446e48194de13464212fa
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/ChangeUtil.java

@@ -31,7 +31,6 @@ import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.UpdateException;
 import com.google.gerrit.server.git.validators.CommitValidators;
 import com.google.gerrit.server.mail.RevertedSender;
-import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.notedb.ChangeUpdate;
 import com.google.gerrit.server.project.ChangeControl;
 import com.google.gerrit.server.project.NoSuchChangeException;
@@ -284,26 +283,6 @@ public class ChangeUtil {
     }
   }
 
-  public String getMessage(ChangeNotes notes)
-      throws NoSuchChangeException, OrmException,
-      MissingObjectException, IncorrectObjectTypeException, IOException {
-    Change.Id changeId = notes.getChangeId();
-    PatchSet ps = psUtil.current(db.get(), notes);
-    if (ps == null) {
-      throw new NoSuchChangeException(changeId);
-    }
-
-    try (Repository git =
-          gitManager.openRepository(notes.getProjectName());
-        RevWalk revWalk = new RevWalk(git)) {
-      RevCommit commit = revWalk.parseCommit(
-          ObjectId.fromString(ps.getRevision().get()));
-      return commit.getFullMessage();
-    } catch (RepositoryNotFoundException e) {
-      throw new NoSuchChangeException(changeId, e);
-    }
-  }
-
   public static PatchSet.Id nextPatchSetId(PatchSet.Id id) {
     return new PatchSet.Id(id.getParentKey(), id.get() + 1);
   }

gerrit-server/src/main/java/com/google/gerrit/server/change/GetContent.java

@@ -17,27 +17,44 @@ package com.google.gerrit.server.change;
 import com.google.gerrit.extensions.restapi.BinaryResult;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.RestReadView;
+import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Patch;
-import com.google.gerrit.server.ChangeUtil;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.PatchSetUtil;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.project.NoSuchChangeException;
 import com.google.gwtorm.server.OrmException;
 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.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
 
 import java.io.IOException;
 
 @Singleton
 public class GetContent implements RestReadView<FileResource> {
+  private final Provider<ReviewDb> db;
+  private final GitRepositoryManager gitManager;
+  private final PatchSetUtil psUtil;
   private final FileContentUtil fileContentUtil;
-  private final ChangeUtil changeUtil;
 
   @Inject
-  GetContent(FileContentUtil fileContentUtil,
+  GetContent(
-      ChangeUtil changeUtil) {
+      Provider<ReviewDb> db,
+      GitRepositoryManager gitManager,
+      PatchSetUtil psUtil,
+      FileContentUtil fileContentUtil) {
+    this.db = db;
+    this.gitManager = gitManager;
+    this.psUtil = psUtil;
     this.fileContentUtil = fileContentUtil;
-    this.changeUtil = changeUtil;
   }
 
   @Override
@@ -46,7 +63,7 @@ public class GetContent implements RestReadView<FileResource> {
       OrmException {
     String path = rsrc.getPatchKey().get();
     if (Patch.COMMIT_MSG.equals(path)) {
-      String msg = changeUtil.getMessage(
+      String msg = getMessage(
           rsrc.getRevision().getChangeResource().getNotes());
       return BinaryResult.create(msg)
           .setContentType(FileContentUtil.TEXT_X_GERRIT_COMMIT_MESSAGE)
@@ -57,4 +74,22 @@ public class GetContent implements RestReadView<FileResource> {
         ObjectId.fromString(rsrc.getRevision().getPatchSet().getRevision().get()),
         path);
   }
+
+  private String getMessage(ChangeNotes notes)
+      throws NoSuchChangeException, OrmException, IOException {
+    Change.Id changeId = notes.getChangeId();
+    PatchSet ps = psUtil.current(db.get(), notes);
+    if (ps == null) {
+      throw new NoSuchChangeException(changeId);
+    }
+
+    try (Repository git = gitManager.openRepository(notes.getProjectName());
+        RevWalk revWalk = new RevWalk(git)) {
+      RevCommit commit = revWalk.parseCommit(
+          ObjectId.fromString(ps.getRevision().get()));
+      return commit.getFullMessage();
+    } catch (RepositoryNotFoundException e) {
+      throw new NoSuchChangeException(changeId, e);
+    }
+  }
 }