Add abstract methods to the ChangeEvent hierarchy

There is some common information in the ChangeEvent hierarchy, such as
the type string, the change, and the project, that is not expressed in
the old POJO hierarchy. Add a few convenience methods that can be used
if the user has just a ChangeEvent, but which do not affect the JSON
serialization.

Change-Id: I22aadf76835528a63743bd758b5d6868dad212ed

gerrit-server/src/main/java/com/google/gerrit/server/events/ChangeAbandonedEvent.java

@@ -14,14 +14,38 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class ChangeAbandonedEvent extends ChangeEvent {
-    public final String type = "change-abandoned";
+  public final String type = "change-abandoned";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute abandoner;
+  public AccountAttribute abandoner;
-    public String reason;
+  public String reason;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/ChangeEvent.java

@@ -14,5 +14,15 @@
 
 package com.google.gerrit.server.events;
 
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
+
 public abstract class ChangeEvent {
+  public abstract String getType();
+
+  public abstract Project.NameKey getProjectNameKey();
+
+  public abstract Change.Key getChangeKey();
+
+  public abstract String getRefName();
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/ChangeMergedEvent.java

@@ -14,13 +14,37 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class ChangeMergedEvent extends ChangeEvent {
-    public final String type = "change-merged";
+  public final String type = "change-merged";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute submitter;
+  public AccountAttribute submitter;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/ChangeRestoredEvent.java

@@ -14,14 +14,38 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class ChangeRestoredEvent extends ChangeEvent {
-    public final String type = "change-restored";
+  public final String type = "change-restored";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute restorer;
+  public AccountAttribute restorer;
-    public String reason;
+  public String reason;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/CommentAddedEvent.java

@@ -14,16 +14,40 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ApprovalAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class CommentAddedEvent extends ChangeEvent {
-    public final String type = "comment-added";
+  public final String type = "comment-added";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute author;
+  public AccountAttribute author;
-    public ApprovalAttribute[] approvals;
+  public ApprovalAttribute[] approvals;
-    public String comment;
+  public String comment;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/CommitReceivedEvent.java

@@ -14,6 +14,7 @@
 
 package com.google.gerrit.server.events;
 
+import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.IdentifiedUser;
 
@@ -21,6 +22,7 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.transport.ReceiveCommand;
 
 public class CommitReceivedEvent extends ChangeEvent {
+  public final String type = "commit-received";
   public final ReceiveCommand command;
   public final Project project;
   public final String refName;
@@ -35,4 +37,24 @@ public class CommitReceivedEvent extends ChangeEvent {
     this.commit = commit;
     this.user = user;
   }
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return project.getNameKey();
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return null;
+  }
+
+  @Override
+  public String getRefName() {
+    return refName;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/DraftPublishedEvent.java

@@ -14,13 +14,37 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class DraftPublishedEvent extends ChangeEvent {
-    public final String type = "draft-published";
+  public final String type = "draft-published";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute uploader;
+  public AccountAttribute uploader;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/HashtagsChangedEvent.java

@@ -14,6 +14,10 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 
@@ -24,4 +28,24 @@ public class HashtagsChangedEvent extends ChangeEvent {
   public String[] added;
   public String[] removed;
   public String[] hashtags;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/MergeFailedEvent.java

@@ -14,14 +14,38 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class MergeFailedEvent extends ChangeEvent {
-    public final String type = "merge-failed";
+  public final String type = "merge-failed";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute submitter;
+  public AccountAttribute submitter;
-    public String reason;
+  public String reason;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/PatchSetCreatedEvent.java

@@ -14,13 +14,37 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class PatchSetCreatedEvent extends ChangeEvent {
-    public final String type = "patchset-created";
+  public final String type = "patchset-created";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute uploader;
+  public AccountAttribute uploader;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/RefOperationReceivedEvent.java

@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.gerrit.server.events;
 
+import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.IdentifiedUser;
 
@@ -23,4 +24,24 @@ public class RefOperationReceivedEvent extends ChangeEvent {
   public ReceiveCommand command;
   public Project project;
   public IdentifiedUser user;
-}
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return project.getNameKey();
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return null;
+  }
+
+  @Override
+  public String getRefName() {
+    return command.getRefName();
+  }
+}

gerrit-server/src/main/java/com/google/gerrit/server/events/RefUpdatedEvent.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.events;
 
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.RefUpdateAttribute;
 
@@ -21,4 +23,24 @@ public class RefUpdatedEvent extends ChangeEvent {
   public final String type = "ref-updated";
   public AccountAttribute submitter;
   public RefUpdateAttribute refUpdate;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(refUpdate.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return null;
+  }
+
+  @Override
+  public String getRefName() {
+    return refUpdate.refName;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/ReviewerAddedEvent.java

@@ -14,13 +14,37 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 import com.google.gerrit.server.data.PatchSetAttribute;
 
 public class ReviewerAddedEvent extends ChangeEvent {
-    public final String type = "reviewer-added";
+  public final String type = "reviewer-added";
-    public ChangeAttribute change;
+  public ChangeAttribute change;
-    public PatchSetAttribute patchSet;
+  public PatchSetAttribute patchSet;
-    public AccountAttribute reviewer;
+  public AccountAttribute reviewer;
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/events/TopicChangedEvent.java

@@ -14,6 +14,10 @@
 
 package com.google.gerrit.server.events;
 
+import static org.eclipse.jgit.lib.Constants.R_HEADS;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.data.AccountAttribute;
 import com.google.gerrit.server.data.ChangeAttribute;
 
@@ -22,4 +26,24 @@ public class TopicChangedEvent extends ChangeEvent {
   public ChangeAttribute change;
   public AccountAttribute changer;
   public String oldTopic;
-}
+
+  @Override
+  public String getType() {
+    return type;
+  }
+
+  @Override
+  public Project.NameKey getProjectNameKey() {
+    return new Project.NameKey(change.project);
+  }
+
+  @Override
+  public Change.Key getChangeKey() {
+    return new Change.Key(change.id);
+  }
+
+  @Override
+  public String getRefName() {
+    return R_HEADS + change.branch;
+  }
+}