Move isSingleProjectMatch() to RemoteConfiguration interface

The logic used to identify whether a configuration is related to a
single project as opposed to a family of project, is the same across
destination or source targets.

Provide a default  isSingleProjectMatch method so that it can be
leveraged by both replication (for DestinationConfiguration) and by
pull-replication (for SourceConfiguration)

Change-Id: I1a366841e77755a1d17cfd9f68fe235a7a099f48

src/main/java/com/googlesource/gerrit/plugins/replication/DestinationConfiguration.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/DestinationConfiguration.java b/src/main/java/com/googlesource/gerrit/plugins/replication/DestinationConfiguration.java
index d12abc4..4b757ea 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/DestinationConfiguration.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/DestinationConfiguration.java
@@ -17,7 +17,6 @@
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableList;
 import com.google.gerrit.server.config.ConfigUtil;
-import java.util.List;
 import java.util.concurrent.TimeUnit;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.transport.RemoteConfig;
@@ -167,24 +166,6 @@
     return cfg.getInt("remote", rc.getName(), name, defValue);
   }
 
-  boolean isSingleProjectMatch() {
-    List<String> projects = getProjects();
-    boolean ret = (projects.size() == 1);
-    if (ret) {
-      String projectMatch = projects.get(0);
-      if (ReplicationFilter.getPatternType(projectMatch)
-          != ReplicationFilter.PatternType.EXACT_MATCH) {
-        // projectMatch is either regular expression, or wild-card.
-        //
-        // Even though they might refer to a single project now, they need not
-        // after new projects have been created. Hence, we do not treat them as
-        // matching a single project.
-        ret = false;
-      }
-    }
-    return ret;
-  }
-
   @Override
   public int getSlowLatencyThreshold() {
     return slowLatencyThreshold;

src/main/java/com/googlesource/gerrit/plugins/replication/RemoteConfiguration.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/RemoteConfiguration.java b/src/main/java/com/googlesource/gerrit/plugins/replication/RemoteConfiguration.java
index aa683ff..b66e73c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/RemoteConfiguration.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/RemoteConfiguration.java
@@ -14,6 +14,7 @@
 package com.googlesource.gerrit.plugins.replication;
 
 import com.google.common.collect.ImmutableList;
+import java.util.List;
 import org.eclipse.jgit.transport.RemoteConfig;
 
 /** Remote configuration for a replication endpoint */
@@ -95,4 +96,27 @@
    * @return the slow latency threshold
    */
   int getSlowLatencyThreshold();
+
+  /**
+   * Whether the remote configuration is for a single project only
+   *
+   * @return true, when configuration is for a single project, false otherwise
+   */
+  default boolean isSingleProjectMatch() {
+    List<String> projects = getProjects();
+    boolean ret = (projects.size() == 1);
+    if (ret) {
+      String projectMatch = projects.get(0);
+      if (ReplicationFilter.getPatternType(projectMatch)
+          != ReplicationFilter.PatternType.EXACT_MATCH) {
+        // projectMatch is either regular expression, or wild-card.
+        //
+        // Even though they might refer to a single project now, they need not
+        // after new projects have been created. Hence, we do not treat them as
+        // matching a single project.
+        ret = false;
+      }
+    }
+    return ret;
+  }
 }