ChangeQueryProcessor: Don't implement PluginAttributesFactory

Return a PluginDefinedAttributesFactory via a named getter on
ChangeQueryProcessor, instead of making ChangeQueryProcessor implement
the interface directly. Without knowing about this interface, a reader
seeing `queryProcessor.create(cd)` might be confused: create what, a
ChangeInfo? (Wrong.)

Change-Id: I07c03169cc13758a7b5649123ccfb945390dd46d

java/com/google/gerrit/server/query/change/ChangeQueryProcessor.java

@@ -17,6 +17,7 @@ package com.google.gerrit.server.query.change;
 import static com.google.common.base.Preconditions.checkState;
 import static com.google.gerrit.server.query.change.ChangeQueryBuilder.FIELD_LIMIT;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableListMultimap;
 import com.google.gerrit.extensions.common.PluginDefinedInfo;
 import com.google.gerrit.extensions.registration.DynamicMap;
@@ -45,7 +46,6 @@ import com.google.gerrit.server.project.ProjectCache;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -56,9 +56,7 @@ import java.util.Set;
  * holding on to a single instance.
  */
 public class ChangeQueryProcessor extends QueryProcessor<ChangeData>
-    implements DynamicOptions.BeanReceiver,
+    implements DynamicOptions.BeanReceiver, DynamicOptions.BeanProvider {
-        DynamicOptions.BeanProvider,
-        PluginDefinedAttributesFactory {
   private final Provider<CurrentUser> userProvider;
   private final ChangeNotes.Factory notesFactory;
   private final ImmutableListMultimap<String, ChangeAttributeFactory> attributeFactoriesByPlugin;
@@ -131,8 +129,11 @@ public class ChangeQueryProcessor extends QueryProcessor<ChangeData>
     return dynamicBeans.get(plugin);
   }
 
-  @Override
+  public PluginDefinedAttributesFactory getAttributesFactory() {
-  public List<PluginDefinedInfo> create(ChangeData cd) {
+    return this::buildPluginInfo;
+  }
+
+  private ImmutableList<PluginDefinedInfo> buildPluginInfo(ChangeData cd) {
     return PluginDefinedAttributesFactories.createAll(
         cd,
         this,

java/com/google/gerrit/server/query/change/OutputStreamQuery.java

@@ -324,7 +324,7 @@ public class OutputStreamQuery {
       eventFactory.addDependencies(rw, c, d.change(), d.currentPatchSet());
     }
 
-    c.plugins = queryProcessor.create(d);
+    c.plugins = queryProcessor.getAttributesFactory().create(d);
     return c;
   }
 

java/com/google/gerrit/server/restapi/change/QueryChanges.java

@@ -143,7 +143,8 @@ public class QueryChanges implements RestReadView<TopLevelResource>, DynamicOpti
 
     int cnt = queries.size();
     List<QueryResult<ChangeData>> results = imp.query(qb.parse(queries));
-    List<List<ChangeInfo>> res = json.create(options, this.imp).format(results);
+    List<List<ChangeInfo>> res =
+        json.create(options, this.imp.getAttributesFactory()).format(results);
     for (int n = 0; n < cnt; n++) {
       List<ChangeInfo> info = res.get(n);
       if (results.get(n).more() && !info.isEmpty()) {