Simplify InstallPlugin

Create instances using a Provider, and add builder methods to
set the parameters.

This makes the implementation more consistent with other REST
endpoints, and will make it easier to use from the plugin API.

Change-Id: I5a4db8917c47c62dc5ce199ecad70c724e4e876c

gerrit-server/src/main/java/com/google/gerrit/server/plugins/InstallPlugin.java

@@ -24,6 +24,7 @@ import com.google.gerrit.extensions.restapi.Response;
 import com.google.gerrit.extensions.restapi.RestModifyView;
 import com.google.gerrit.extensions.restapi.TopLevelResource;
 import com.google.inject.Inject;
+import com.google.inject.Provider;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintWriter;
@@ -34,13 +35,23 @@ import java.util.zip.ZipException;
 @RequiresCapability(GlobalCapability.ADMINISTRATE_SERVER)
 class InstallPlugin implements RestModifyView<TopLevelResource, InstallPluginInput> {
   private final PluginLoader loader;
-  private final String name;
-  private final boolean created;
 
-  InstallPlugin(PluginLoader loader, String name, boolean created) {
+  private String name;
+  private boolean created;
+
+  @Inject
+  InstallPlugin(PluginLoader loader) {
     this.loader = loader;
+  }
+
+  public InstallPlugin setName(String name) {
     this.name = name;
+    return this;
+  }
+
+  public InstallPlugin setCreated(boolean created) {
     this.created = created;
+    return this;
   }
 
   @Override
@@ -84,18 +95,17 @@ class InstallPlugin implements RestModifyView<TopLevelResource, InstallPluginInp
 
   @RequiresCapability(GlobalCapability.ADMINISTRATE_SERVER)
   static class Overwrite implements RestModifyView<PluginResource, InstallPluginInput> {
-    private final PluginLoader loader;
+    private final Provider<InstallPlugin> install;
 
     @Inject
-    Overwrite(PluginLoader loader) {
-      this.loader = loader;
+    Overwrite(Provider<InstallPlugin> install) {
+      this.install = install;
     }
 
     @Override
     public Response<PluginInfo> apply(PluginResource resource, InstallPluginInput input)
         throws BadRequestException, MethodNotAllowedException, IOException {
-      return new InstallPlugin(loader, resource.getName(), false)
-          .apply(TopLevelResource.INSTANCE, input);
+      return install.get().setName(resource.getName()).apply(TopLevelResource.INSTANCE, input);
     }
   }
 }

gerrit-server/src/main/java/com/google/gerrit/server/plugins/PluginsCollection.java

@@ -33,13 +33,18 @@ public class PluginsCollection
   private final DynamicMap<RestView<PluginResource>> views;
   private final PluginLoader loader;
   private final Provider<ListPlugins> list;
+  private final Provider<InstallPlugin> install;
 
   @Inject
   PluginsCollection(
-      DynamicMap<RestView<PluginResource>> views, PluginLoader loader, Provider<ListPlugins> list) {
+      DynamicMap<RestView<PluginResource>> views,
+      PluginLoader loader,
+      Provider<ListPlugins> list,
+      Provider<InstallPlugin> install) {
     this.views = views;
     this.loader = loader;
     this.list = list;
+    this.install = install;
   }
 
   @Override
@@ -64,7 +69,7 @@ public class PluginsCollection
     if (!loader.isRemoteAdminEnabled()) {
       throw new MethodNotAllowedException("remote installation is disabled");
     }
-    return new InstallPlugin(loader, id.get(), true /* created */);
+    return install.get().setName(id.get()).setCreated(true);
   }
 
   @Override