WatchConfig.Accessor: Add method to delete all watches of an account

The new method allows to delete all project watches of an account as an
atomic operation. We need this method to finish the migration of the
project watches to NoteDb on gerrit-review.

Change-Id: I6e4b50dc99913641bc9d39bab60a6bc5b2f2f073
Signed-off-by: Edwin Kempin <ekempin@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/WatchConfig.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/WatchConfig.java
index a3cd0c92c4..f24ef2eb16 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/WatchConfig.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/WatchConfig.java
@@ -148,6 +148,19 @@ public class WatchConfig extends VersionedMetaData
       }
     }
 
+    public synchronized void deleteAllProjectWatches(Account.Id accountId)
+        throws IOException, ConfigInvalidException {
+      WatchConfig watchConfig = read(accountId);
+      boolean commit = false;
+      if (!watchConfig.getProjectWatches().isEmpty()) {
+        watchConfig.getProjectWatches().clear();
+        commit = true;
+      }
+      if (commit) {
+        commit(watchConfig);
+      }
+    }
+
     private WatchConfig read(Account.Id accountId)
         throws IOException, ConfigInvalidException {
       try (Repository git = repoManager.openRepository(allUsersName)) {