Merge "Add support for plugin root level command"

gerrit-sshd/src/main/java/com/google/gerrit/sshd/SingleCommandPluginModule.java

@@ -0,0 +1,45 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.sshd;
+
+import com.google.common.base.Preconditions;
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.inject.binder.LinkedBindingBuilder;
+
+import org.apache.sshd.server.Command;
+
+import javax.inject.Inject;
+
+/**
+ * Binds one SSH command to the plugin name itself.
+ * <p>
+ * Cannot be combined with {@link PluginCommandModule}.
+ */
+public abstract class SingleCommandPluginModule extends CommandModule {
+  private CommandName command;
+
+  @Inject
+  void setPluginName(@PluginName String name) {
+    this.command = Commands.named(name);
+  }
+
+  @Override
+  protected final void configure() {
+    Preconditions.checkState(command != null, "@PluginName must be provided");
+    configure(bind(Commands.key(command)));
+  }
+
+  protected abstract void configure(LinkedBindingBuilder<Command> bind);
+}